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On the Lighter Side => Science Experiments => Topic started by: hamdani yusuf on 07/04/2016 12:39:32

Title: How do microwaves behave?
Post by: hamdani yusuf on 07/04/2016 12:39:32
Basically this series of experiment is a sequel of previous experiments regarding diffraction of light, which leaves some unanswered questions. I hope from the next experiments we can build a workable model to explain the behavior of electromagnetic waves in general, and their interaction with matters.

video #1 : Introduction

In this video series we are going to investigate another form of electromagnetic wave, which is commonly called microwave. By doing so, hopefully we can get better understanding on the nature of electromagnetic wave.

A huge advantage of using microwave compared to visible light is its wavelength which is in the order of a few centimeters, which makes it convenient to manipulate. Variables obscured by the small scale of optical experiments can be easily observed and manipulated.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 07/04/2016 12:43:21
this video #2 shows the microwave transmittance through several type of media.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 07/04/2016 12:45:59
Video #3 here shows reflection of microwave by several types of media.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 07/04/2016 12:54:12
video#4 shows a phenomenon called linear polarization which is observed in microwave transmission. Up to this point we just go with standard experimental setup usually done in school kids' physics laboratory.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 07/04/2016 15:27:10
VIDEO#5 shows something rarely demonstrated in schools lab, which is reflection by microwave linear polarizer.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 14/04/2016 06:13:25
In video#6, Elliptical Polarization is demonstrated using linearly polarized transmitter, a linear polarizer, and a reflector. There is also another method which is commercially used, but here we use already available components whose characteristics are individually identifiable.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 14/04/2016 06:17:54
in video#7 we try to determine the size of photon, which is thought to be the quantum of light and all other forms of electromagnetic radiation, including microwave. We use two metal plates to create a single slit with adjustable width.
Title: Re: investigation on microwave
Post by: hamdani yusuf on 14/04/2016 07:06:31
Determination of "photon size" is continued in video#8, using multiple slit







Spoiler alert :
From the experiments shown in this video, it is clear that photon model is not the best way to describe microwave interaction with electrically conductive materials. We need a better model based on following facts:
-   Microwave can still pass through even when its transmission path is almost entirely covered by metal sheet. (This is found when the metal sheet is restricted so it cannot produce opposing electrical oscillation that cancel out the transmitted wave.)
-   Microwave can be completely blocked even when there are much space uncovered by conductor. (This is found when there are adequate conductors to produce opposing electrical oscillation that cancel out the transmitted wave.)
-   Maximum transmission is achieved when the Gunn diode in the transmitter is aligned with the Schottky diode in the receiver, if there is no obstacle between them.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/04/2016 10:39:13
This video#9 shows a linearly polarized microwave's axis can be rotated by a sparse metal grating. It can also be turned into an elliptically polarized microwave if another sparse metal grating is added after the first.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/04/2016 10:58:53
In this video#10 we are investigating the power dissipated by microwave transmitter. The power used by transmitter is measured using this milli-Ampere clamp meter. It is shown that placement of a reflector can affect transmitter's power consumption.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 19/07/2016 11:05:32
youtu.be/nfYDiqiH5mU
This video shows that microwave can also experience refraction, just like normal optics.

The hardest part in making this video was molding the paraffin wax prism. But this worth the effort, since it will be used in several videos to come, which investigate total internal reflection and evanescent wave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/07/2016 15:28:50
In this video #12 we are investigating total internal reflection in microwave using paraffin wax prism.

youtube.com/watch?v=vsO71mWGxKs
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/07/2016 15:33:08

This video#13 shows a phenomenon called evanescent wave coupling. This is a continuation of previous video about total internal reflection where electromagnetic wave can't pass through the boundary between two media. Introducing additional medium beyond the boundary can make the em wave pass through the previously impenetrable boundary.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/07/2016 15:39:13

In this video#14 we demonstrated that placing another transparent prism in a total internal reflection can turn it into a partial internal reflection.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/07/2016 15:41:54

This video#15 shows that intensity received from Total Internal Reflection setup can be amplified by simply adding a metal plate behind the prism.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/07/2016 15:48:52
My video #16 we investigate effects of refraction to polarization state of microwave.



www.youtube.com/watch?v=ZkG-wNUGkUs

The result shows that refracted microwave retains its polarization state. No phase shift difference between s and p polarized plane.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/07/2016 15:56:15
www.youtube.com/watch?v=Vdny18rY8m0

This video #17 investigates effects of total internal reflection to polarization state of microwave. The result shows that total internal reflection on microwave introduce phase shift difference between s and p polarized plane, which turn linearly polarized wave into elliptically polarized wave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/07/2016 16:01:06
Similar to previous video, but now we are investigating polarization in partial and amplified internal reflection.
www.youtube.com/watch?v=sd_p-pwB41U
Title: Re: How do microwaves behave?
Post by: timey on 26/07/2016 16:43:26
Similar to previous video, but now we are investigating polarization in partial and amplified internal reflection.
www.youtube.com/watch?v=sd_p-pwB41U
I think I'm going to have to start at the very beginning of your  YouTube experiments and watch them all in one go... I get the impression you are building up to something important that is presently evading me, and that I should pay more attention.

Do the results of your experiments lead you to a definitive hypothesis?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/07/2016 06:00:03
I think I'm going to have to start at the very beginning of your  YouTube experiments and watch them all in one go... I get the impression you are building up to something important that is presently evading me, and that I should pay more attention.

Do the results of your experiments lead you to a definitive hypothesis?
Thank you for your appreciation to my work.
Yes, I had some hypotheses to explain results from widely known physics experiments. I think some aspect of currently accepted explanations are unclear or doesn't seem to fit in some phenomena that I know.
The aim of my experiments is to verify those phenomena as first hand observer, and rule out hypotheses that contradict the results.
Currently I have a hypothesis which seems potential to explain those phenomena. I already have in mind a model that can provide a mechanism to explain reflection and polarization, but still need more work to explain refraction.

Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 30/08/2016 11:28:25
I have uploaded my latest video of my investigation on microwave's behavior. This time I demonstrate interference of microwave using two paraffin plates which act as dielectric material. Here we can see clearly the occurrence of constructive and destructive interference of the microwave due to the gap between the plates, related to microwave's wave length.

youtube.com/watch?v=2heUH1a9yYo
I think this experiment hold a key point for building my new theory on electromagnetic wave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 30/01/2017 06:04:45
My current research in optics and microwave are strongly indicating that refraction is best viewed as multilayer partial reflection.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 12/02/2017 09:40:06
At last I can replicate refraction and internal reflection in microwave using array of metallic cylinders. I'll upload the video soon.
Stay tuned!
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/03/2017 05:18:47
I have uploaded new video showing diffraction in microwave frequency.


Basically, the experiment result leads us to conclude that diffraction comes from the material blocking the microwave path. When the obstruction is opaque enough, we find no diffraction. It's similar to my experiment using laser showing non-diffractive obstruction.

This result is not widely known yet.
 
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/03/2017 05:22:00
My next videos will explore further microwave behavior when interacting with meta-materials in various shapes and configurations.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 23/03/2017 19:43:50
Have you mistaken this site for your blog?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/03/2017 01:14:45
Have you mistaken this site for your blog?
No. I think that this part of the forum is for "Discussion of science experiments on the show or to do at home".
Just read the description of "Science Experiments".
If this is not the right place to share my experiments with other members of the forum who are curious about science, could you please tell me where should I put them?
Title: Re: How do microwaves behave?
Post by: evan_au on 25/03/2017 09:14:48
I watched a few of the experiments, and they illustrate some interesting effects of electromagnetism.

I hope the power of the transmitter is quite low, as microwave exposure has been associated with development of cataracts in the eyes - the lens of the eye has a poor blood supply, and so has trouble keeping at 37C when exposed to microwaves. Maybe just turn on the transmitter for a few seconds while filming, then take a break while planning the next experiment?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/03/2017 00:03:08
I watched a few of the experiments, and they illustrate some interesting effects of electromagnetism.

I hope the power of the transmitter is quite low, as microwave exposure has been associated with development of cataracts in the eyes - the lens of the eye has a poor blood supply, and so has trouble keeping at 37C when exposed to microwaves. Maybe just turn on the transmitter for a few seconds while filming, then take a break while planning the next experiment?
Thanks for your advice.
I've measured electrical power consumption of the transmitter in one of my video. It took around 22 mA at 220 V to operate. So the power consumption is around 4.8 Watts, which is much less than average microwave cooker.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 26/03/2017 10:14:38
...
No. I think that this part of the forum is for "Discussion of science experiments on the show or to do at home".
...
A discussion needs more than one person.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/03/2017 13:06:45
Which part of my experiments would you like to discuss?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/03/2017 01:11:39
Let's start with my latest video demonstrating diffraction. Do you expect that metal plate doesn't diffract microwave, while dielectric materials do?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/03/2017 01:18:37
Have you expected vertically polarized microwave to go through a surface which is almost completely covered by metal except for some horizontal thin slits?
Or have you expected that the same microwave cannot go through an almost empty plane except for some vertical wires?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/03/2017 02:03:12
Have you expected that a metal plate and a metal grating, can turn linearly polarized microwave into circularly polarized microwave?
Or that the same feature can be done by two rarely arranged metal gratings?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/03/2017 02:05:39
Can you explain the behavior of evanescent wave?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/03/2017 02:08:01
Or one simple fact that a metal grating can rotate linearly polarized microwave?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 01/04/2017 14:33:39
I have uploaded three more videos investigating behavior of microwave. This time I use meta-material.
The first is constructing meta-material to demonstrate interference by partial reflector

Second, we emulate refraction in microwave using meta-material, which is a multilayer metal grating

Lastly, reconstructing prism for microwave using meta-material to demonstrate refraction and internal reflection.

NB: This is not an April fool
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/04/2017 03:20:18
Here is a new video demonstrating diffraction of microwave using multilayer metal grating, which is a meta-material.

Same as diffraction by normal material, it only occurs when the meta-material is adequately transparent to the microwave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 21/04/2017 03:50:15
I also uploaded a video demonstrating a non-refractive prism.


According to Fermat's principle of least time, the result shown in the video would mean that the microwave propagates through the prism with same speed as it would in air, or refractive index of the prism is 1.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/04/2017 06:42:35
My next video try to replicate previous demonstration of refraction by meta-material. Instead of tubular metal, this experiment uses flat metal strip as basic unit of the meta-material. Interesting things are observed, especially apparent refractive index less than 1, which indicates FTL phenomenon.


Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 06/05/2017 09:03:31
The difference between multilayer flat strips in the last video and multilayer metal grating which produces "normal" refraction seems to be merely due to the lack of longitudinal conductor component in the flat strips. So I plan to investigate further about longitudinal propagation in microwave in the next videos.
Do you have any idea about how could this be done?
Title: Re: How do microwaves behave?
Post by: whichosedn51 on 13/06/2017 06:48:39
Thank you for this great information. I was interested always how microwave works :)
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/11/2017 02:51:43
Thank you for this great information. I was interested always how microwave works :)
I'm glad I can help.
My intention of uploading the videos on youtube is to provide access to scientific equipment for those who is interested but cannot afford it just for their curiosity. So if you have any interesting idea, just let me know. I hope I can try to make it happen.
 
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/11/2017 03:06:44

During my investigation on longitudinal propagation of microwave, I inadvertently got absorption effect by a metamaterial object. The incoming microwave doesn't seem to go anywhere out of the object. Only small amount of microwave is transmitted, and the reflected microwave is also small. It can't be detected in any other directions, as if it is retained inside the object. Perhaps the energy is converted to another form, likely in to heat, but currently I have no means to confirm that.
Title: Re: How do microwaves behave?
Post by: CristinaFinn on 21/07/2018 10:56:31
Indeed Informative. I was just looking how microwave behave and got it here
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 14/09/2018 11:57:44
Indeed Informative. I was just looking how microwave behave and got it here
Thank you. I'm glad to help.
Here is my latest video investigating propagation of longitudinal microwave using meander sheet.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/08/2019 10:22:47
Hi, long time no see.
I have finally finished uploading new videos investigating behavior of microwave when interacting with various materials. Here is one continuing the experiment on longitudinal oscillation of microwave, this time we use elongated grids.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/08/2019 10:27:13
This video introduces a new type of apparatus to explore microwave optics. The partial polarizing filter passes through microwave oscillating perpendicular to its axis while only partially blocks/reflects microwave oscillating parallel to its axis.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/08/2019 10:31:23
This video demonstrates axis rotation by partial polarizer.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/08/2019 10:35:06
This video demonstrates interference of microwave by partial polarizer. By plotting the position of constructive and destructive interference,  we can calculate the effective wavelength of the microwave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/08/2019 10:36:26
Here we tried to produce circularly polarized microwave by using two partial polarizers to generate phase shift in vertical axis while leaving horizontal axis undisturbed.
Title: How do microwaves behave
Post by: AustinnEp on 05/09/2019 16:44:15
Assuming that bodies at rest with zero mass necessarily have zero energy, this implies the famous formula E = mc2  but only for bodies which are at rest.
Title: Re: How do microwaves behave?
Post by: jeffreyH on 05/09/2019 18:37:12
Assuming that bodies at rest with zero mass necessarily have zero energy, this implies the famous formula E = mc2  but only for bodies which are at rest.

How can you have a body with zero mass 'at rest'. By definition it has ZERO REST MASS! What are you talking about?
Title: Re: How do microwaves behave?
Post by: Bored chemist on 05/09/2019 19:47:14
Assuming that bodies at rest with zero mass necessarily have zero energy, this implies the famous formula E = mc2  but only for bodies which are at rest.
Does that have anything to do with this thread?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 06/09/2019 17:32:42
I started this thread to demonstrate behavior of electromagnetic wave, especially in microwave range, which has convenient wavelength to observe its interaction with objects having comparable size. Along the way, I found that many widespread explanations and analogies on behavior of electromagnetic wave don't match with experiment results.
Newer videos are meant to try to resolve questions arise from previous videos. They are like collecting pieces of puzzle wich will be assembled to form a complete picture accurately represents the behavior of microwave.
I think I already have a good model which can explain phenomena like transmission, reception, reflection, diffraction,     interference, absorbsion, speed change, phase shift, polarization axis rotation, linear and circular polarization. I still need more pieces of puzzle to explain refraction (either with positive or negative refractive index). From my experiment results, it turns out that propagation slowdown alone is not sufficient to explain change of direction in refraction.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/09/2019 12:46:42
When I prepared these videos, I lost my voice due to laryngitis. So I tried to use online text to speech engine to generate the voice over. Here I used  https://ttsmp3.com/ . It turns out this process is faster and easier for me.
This video explores interaction between two partial polarizers.

While this video shows the behavior of microwave when interacting with thin wires arranged to form a prism. In an older video I have shown that a prism made of metallic cylinders can emulate behavior of normal prisms such as refraction, surface reflection, and internal reflection.
Spoiler: show
Those phenomena were not observed here

Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 19/11/2019 09:31:46
I have uploaded a new video trying to show the blocking mechanism of microwave by various arrangements of conducting material. Those arrangements are modified versions of microwave polarizer used in previous videos.


Spoiler: show
It shows that the same amount of conductor can have different effectiveness in blocking microwave. The result may seem counterintuitive, where an arrangement which have large gaps can be a more effective blocker than another arrangement which is more evenly spread, even though they have the same amount of conductor.
Due to its length, I'll upload my effort to explain the result in another videos, so stay tuned.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/11/2019 10:18:04
And my explanation for the result we get in previous video is shown here

Spoiler: show
The video explains that an obstruction blocks microwave propagation by generating reactive wave with reversed polarity to the original one. The original wave is canceled due to destructive interference.
The explanation is based on antenna theory.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/11/2019 05:37:52
I found a short video explaining how a dipole antenna works in a simple way.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 02/12/2019 03:08:08
Here is the supporting evidence for the explanation given in previous video about microwave blocking mechanism using a model of antenna as receiver and transmitter at once, and followed by superposition principle.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 06/12/2019 07:26:40
This time I investigate the behavior of microwave in the presence of rectangular waveguide.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/06/2020 10:14:12
I've made other experiments with microwave based on antenna theory. It would take some time to create, edit, and upload the video. The results suggest that matter interacts with EM wave following the rules of antenna theory. The rules seem to still apply to metamaterials.
I think we can extend their usage for natural dielectric materials by taking into account their molecular structures. When we get the complete relationships, we will be able to derive the emergence of material's electric permittivities and magnetic permeabilities in various axis from the molecular structures.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/06/2020 13:29:42
This is an older experiment, a continuation of the waveguide, but I just finished editing and uploading the video just recently.

Again, this result suggests strongly that microwave behaves according to antenna theory.
Title: Re: How do microwaves behave?
Post by: OliVDB on 29/06/2020 18:46:10
Thanks, that's pretty fascinating! It's really a topic I'm not knowledgeable about - at all - and that's great to finally know how that works.
I guess sending bananas to the past is still beyond the capacities of the average microwave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 09/07/2020 10:04:11
I just uploaded a new video investigating microwave transceiver by building a polarization twister based on antenna theory.
Title: Re: How do microwaves behave?
Post by: OliVDB on 22/07/2020 18:35:34
Thanks once again! I'm starting to be a little bit less clueless with your content, it's really easy to wrap your head around when you're a newcomer to that field!
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/07/2020 08:29:46
Thanks once again! I'm starting to be a little bit less clueless with your content, it's really easy to wrap your head around when you're a newcomer to that field!
You're welcome. I'm glad that what I did is somehow useful for someone. I already recorded many more videos on microwave polarization twister, but unfortunately I couldn't find adequate time to write the scripts, edit, and upload them.
They would contain some phenomena which I think are not yet widely known by most people, such as asymmetric twister and untwisting angle.
Title: Re: How do microwaves behave?
Post by: OliVDB on 31/07/2020 09:51:29
Don't worry, I know it can be difficult, but if you release more videos, I'd be glad to watch them.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 04/08/2020 10:12:54
Finally, I can upload the next video, this time about signal splitting by polarization twister. For now, I'll make short videos by breaking down larger ones due to longer upload time in previous video.
 
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 06/08/2020 07:11:06

This video we explores the effect of polarization twister when it's rotated in various positions. It shows the existence of untwisting angle which I mentioned previously.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 18/08/2020 23:05:18
This video shows interference effect by polarization twister.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/08/2020 07:05:06
Here is the video#46, showing microwave polarization twisting by reflection.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/08/2020 07:06:51
Video#47 and #48: Demonstrations of asymmetric twister.

Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/08/2020 11:50:56
Video#49 showing reflection by asymmetric twister.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 11/09/2020 08:10:04
In video #50 and #51 I demonstrated the behavior of full wavelength polarization twister.

Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 16/10/2020 03:54:46
I'm currently preparing new videos attempting to demistify entanglement as an explanation of experiments using multiple polarizers. In case you are not familiar with the problem, this video can hopefully give you some insight/overview.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 16/11/2020 15:11:03
Due to its length, I need to split the video into 3 parts. They show the results of double polarizer with various combination.


Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 23/11/2020 07:29:54
Here is another video investigating the effect of twin polarizer.
It shows the effect of double polarizer when they are close to each other but are still separated electrically. The last part shows the polarisation of microwave coming out from the last polarizer.

The next video will show the effect of double polarizer when they are close to each other and electrically connected, so stay tuned.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/11/2020 06:43:06
And here are videos demonstrating conjoined twin polarizer

In the end of the experiment, it's shown that rotating the receiver can make the reading down to 0, which means that the microwave is linearly polarized instead of eliptical or circularly polarized.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 28/11/2020 13:53:20
Here are some conclusions from the experiments using twin polarizers :
- microwave passed through a polarizer is oriented perpendicular to the conductors in the polarizer. In other words, polarizers can rotate microwave orientation.
- Electric conductance between polarizer's conductors modifies how they react to incoming microwave.
- Those findings further reinforce our hypothesis that matters interact with microwave by generating reactionary wave which then interferes with original wave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 16/12/2020 10:50:18
I'm preparing a new experiment video called Redirecting Grid. It's a follow up of my previous experiments using polarization twister. They all show that microwave coming out of the aperture don't have the same angle as the incoming wave.
In polarization twister, the orientation of the receiver is perpendicular to that of the transmitter. But in the new experiment, they will have the same orientation. For convenience, I only take vertical polarization, although the horizontal can also be done in principle.
The grid works based on aliasing effect. The conductors in the grid are made more sparse than half of the wavelength.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 18/12/2020 13:06:17
I'm preparing a new experiment video called Redirecting Grid. It's a follow up of my previous experiments using polarization twister. They all show that microwave coming out of the aperture don't have the same angle as the incoming wave.
In polarization twister, the orientation of the receiver is perpendicular to that of the transmitter. But in the new experiment, they will have the same orientation. For convenience, I only take vertical polarization, although the horizontal can also be done in principle.
The grid works based on aliasing effect. The conductors in the grid are made more sparse than half of the wavelength.
Here is the video I promised.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 19/12/2020 11:23:32
The results of my experiments using microwave have convinced me that matters react with electromagnetic wave by creating reactive waves.  They interfere with original wave to give final result which can be measured. I think this model can explain many phenomena in optics and electromagnetism.

"Normal" optical media are merely materials with specific structural properties, such as 3d symmetry. Birefringence is caused by linear asymmetries. Chirality is caused by rotational  asymmetry.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 05/01/2021 08:47:03
I've uploaded a new video investigating further into the behavior of microwave when interacting with a redirecting grid. Additional conductors to the grid change the behavior depending on their positions on the grid.
Title: Re: How do microwaves behave?
Post by: novicepug on 08/01/2021 03:36:13
I've uploaded a new video investigating further into the behavior of microwave when interacting with a redirecting grid. Additional conductors to the grid change the behavior depending on their positions on the grid.
Thank you for your video, this is very enlightening
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 08/01/2021 05:12:06
Thank you for your video, this is very enlightening
I'm glad to help. If you have interesting ideas, or curious about some aspects of the experiments, but have no access to necessary resources to make them happen, please let me know. Maybe there's something I can do to help.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 11/01/2021 07:08:27
Someone may point out that the redirecting grid is demonstrating phenomenon of diffraction, because it produces similar effect to an optical equipment called diffraction grating. But as I mentioned in other threads, the change in direction of microwave propagation is the result of interference from several waves reflected by each conductors.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 13/01/2021 08:18:47
Here is another video about redirecting grid. This time the slots in the corrugated board are mostly filled with conductors.

The results so far support the idea that observed intensity is the result of superposition among individual reactive wave produced by each conductor which acts like an antenna. In this case, their shapes are thin cylinders.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 19/10/2021 11:37:49
My next video using microwave transceiver is about interferometer. I hope to get a better understanding on the behavior of beam splitter. Perhaps it can help demystifying many experimental results involving its usage which many people said to be weird or even mind blowing.

I'd like to keep my videos short to reduce the computational resources in editing them. So I'll split the experimental series into several videos covering each very specific topics.

I've done recording the experiment of standard interferometer using microwave transmitter and receiver, a beam splitter, and two flat reflectors. I should have done this earlier since the equipments required to do the experiment have already been available. When I bought the transceiver, the half mirror was included in the package.

The next experiment I'm already planning is about polarizing interferometer. It has the same setup as standard interferometer, but the half mirror beam splitter is replaced by a polarizer. It looks like we'll get interesting results.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 19/10/2021 13:17:52
Perhaps it can help demystifying many experimental results involving its usage which many people said to be weird or even mind blowing.
Who said that?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/10/2021 03:39:28
Perhaps it can help demystifying many experimental results involving its usage which many people said to be weird or even mind blowing.
Who said that?
https://en.wikipedia.org/wiki/Quantum_eraser_experiment
Quote
In quantum mechanics, the quantum eraser experiment is an interferometer experiment that demonstrates several fundamental aspects of quantum mechanics, including quantum entanglement and complementarity.[1][2][3] The quantum eraser experiment is a variation of Thomas Young's classic double-slit experiment. It establishes that when action is taken to determine which of 2 slits a photon has passed through, the photon cannot interfere with itself. When a stream of photons is marked in this way, then the interference fringes characteristic of the Young experiment will not be seen. The experiment also creates situations in which a photon that has been "marked" to reveal through which slit it has passed can later be "unmarked." A photon that has been "marked" cannot interfere with itself and will not produce fringe patterns, but a photon that has been "marked" and then "unmarked" will interfere with itself and produce the fringes characteristic of Young's experiment.[1]
Quote
A very common misunderstanding about this experiment is that it may be used to instantaneously communicate information between two detectors. It is important to understand the role of the coincidence detector in this experimental setup. The linear polarizer in the top path is effectively filtering out half the entangled photons, and via the coincidence detector, is filtering out the corresponding photons in the bottom path. The coincidence detector can only function by comparing data from both sensors, making it impossible to use this setup for instant communication.

The super bizarre quantum eraser experiment

Quote
https://nexusnewsfeed.com/article/science-futures/the-quantum-eraser-experiment-what-happens-in-the-present-can-change-the-past/

In Brief

The Facts:
At the quantum scale, what we do in the present can impact what happens in the past. This is shown through what's known as the quantum delayed choice choice, or quantum eraser experiment.

Reflect On:
Why are factors associated with consciousness directly intertwined with physical material matter at the quantum scale? What does this mean when it comes to our physical material world in relation to our thoughts, perceptions, feelings and emotions?

One of the founding fathers of quantum theory, Max Planck, who is often credited with originating quantum theory – a feat that won him the Physics Nobel Prize in 1918 – once stated: “I regard consciousness as fundamental. I regard matter as derivative from consciousness. We cannot get behind consciousness. Everything that we talk about, everything that we regard as exiting, postulates consciousness.”
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/10/2021 04:51:57
Here's another one
https://en.wikipedia.org/wiki/Wheeler%27s_delayed-choice_experiment#Experimental_details
Quote
John Wheeler's original discussion of the possibility of a delayed choice quantum appeared in an essay entitled "Law Without Law," which was published in a book he and Wojciech Hubert Zurek edited called Quantum Theory and Measurement, pp 182–213. He introduced his remarks by reprising the argument between Albert Einstein, who wanted a comprehensible reality, and Niels Bohr, who thought that Einstein's concept of reality was too restricted. Wheeler indicates that Einstein and Bohr explored the consequences of the laboratory experiment that will be discussed below, one in which light can find its way from one corner of a rectangular array of semi-silvered and fully silvered mirrors to the other corner, and then can be made to reveal itself not only as having gone halfway around the perimeter by a single path and then exited, but also as having gone both ways around the perimeter and then to have "made a choice" as to whether to exit by one port or the other. Not only does this result hold for beams of light, but also for single photons of light. Wheeler remarked:

The experiment in the form an interferometer, discussed by Einstein and Bohr, could theoretically be used to investigate whether a photon sometimes sets off along a single path, always follows two paths but sometimes only makes use of one, or whether something else would turn up. However, it was easier to say, "We will, during random runs of the experiment, insert the second half-silvered mirror just before the photon is timed to get there," than it was to figure out a way to make such a rapid substitution. The speed of light is just too fast to permit a mechanical device to do this job, at least within the confines of a laboratory. Much ingenuity was needed to get around this problem.

After several supporting experiments were published, Jacques et al. claimed that an experiment of theirs follows fully the original scheme proposed by Wheeler.[14][15] Their complicated experiment is based on the Mach–Zehnder interferometer, involving a triggered diamond N–V colour centre photon generator, polarization, and an electro-optical modulator acting as a switchable beam splitter. Measuring in a closed configuration showed interference, while measuring in an open configuration allowed the path of the particle to be determined, which made interference impossible.

In such experiments, Einstein originally argued, it is unreasonable for a single photon to travel simultaneously two routes. Remove the half-silvered mirror at the [upper right], and one will find that the one counter goes off, or the other. Thus the photon has traveled only one route. It travels only one route. but it travels both routes: it travels both routes, but it travels only one route. What nonsense! How obvious it is that quantum theory is inconsistent!

https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser
(https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Beam_Split_and_fuse.svg/300px-Beam_Split_and_fuse.svg.png)

Especially, this DIY experiment is the main reason I planned to investigate further using microwave.

DIY Homemade Double-slit Quantum Eraser Experiment under 50$

Title: Re: How do microwaves behave?
Post by: Bored chemist on 20/10/2021 08:31:13
Did you notice that the "The super bizarre quantum eraser experiment" video didn't seem to  use a beam splitter?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/10/2021 09:30:11
Did you notice that the "The super bizarre quantum eraser experiment" video didn't seem to  use a beam splitter?
You can see its front picture. It uses a device to split a light beam into 2 different directions. Hence a beam splitter.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 20/10/2021 14:11:20
You can see its front picture. It uses a device to split a light beam into 2 different directions. Hence a beam splitter.
Please post a screen shot.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 20/10/2021 14:21:08
Please post a screen shot.
(https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=66414.0;attach=32416;image)
Title: Re: How do microwaves behave?
Post by: Bored chemist on 20/10/2021 15:55:37
Can you highlight the thing that you think is a beam-splitter.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 21/10/2021 03:31:50
The one partially blocked by his arm.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 21/10/2021 08:40:11
That's a light source, a laser, not a beam splitter.

* Snip.JPG (44.64 kB . 629x469 - viewed 2703 times)
The talk does mention beam splitters later, but they are on the other side of the frame and labelled as half silvered mirrors.

Since there is no beam splitter in that experiment, no experiments you do to clarify your personal understanding of the splitter will help explain the weird effects.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 21/10/2021 23:10:58
Since there is no beam splitter in that experiment, no experiments you do to clarify your personal understanding of the splitter will help explain the weird effects.
In that experiment, the beam splitter is the double slit and splitting crystal.  An ordinary glass prism can also be used as a beam splitter. With certain incoming angle, some of the light will be reflected while the other will be refracted.

Since the video is not the only source mentioning the weird effects in interferometer, proper understanding on how each of its components work is essential to find out the explanation, instead of just shrug and simply accept that the universe is weird.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 22/10/2021 08:26:14
In that experiment, the beam splitter is the double slit and splitting crystal.
Why are you changing the definition of "beam splitter" here?

proper understanding on how each of its components work is essential to find out the explanation,

Why do you propose to study a beam splitter which is not in the experiment?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/10/2021 11:05:51
Why do you propose to study a beam splitter which is not in the experiment?
It is used in another experiment, which is also weird. To understand something, we should start with the simple version of it.
Here's another one
https://en.wikipedia.org/wiki/Wheeler%27s_delayed-choice_experiment#Experimental_details
Quote
John Wheeler's original discussion of the possibility of a delayed choice quantum appeared in an essay entitled "Law Without Law," which was published in a book he and Wojciech Hubert Zurek edited called Quantum Theory and Measurement, pp 182–213. He introduced his remarks by reprising the argument between Albert Einstein, who wanted a comprehensible reality, and Niels Bohr, who thought that Einstein's concept of reality was too restricted. Wheeler indicates that Einstein and Bohr explored the consequences of the laboratory experiment that will be discussed below, one in which light can find its way from one corner of a rectangular array of semi-silvered and fully silvered mirrors to the other corner, and then can be made to reveal itself not only as having gone halfway around the perimeter by a single path and then exited, but also as having gone both ways around the perimeter and then to have "made a choice" as to whether to exit by one port or the other. Not only does this result hold for beams of light, but also for single photons of light. Wheeler remarked:

The experiment in the form an interferometer, discussed by Einstein and Bohr, could theoretically be used to investigate whether a photon sometimes sets off along a single path, always follows two paths but sometimes only makes use of one, or whether something else would turn up. However, it was easier to say, "We will, during random runs of the experiment, insert the second half-silvered mirror just before the photon is timed to get there," than it was to figure out a way to make such a rapid substitution. The speed of light is just too fast to permit a mechanical device to do this job, at least within the confines of a laboratory. Much ingenuity was needed to get around this problem.

After several supporting experiments were published, Jacques et al. claimed that an experiment of theirs follows fully the original scheme proposed by Wheeler.[14][15] Their complicated experiment is based on the Mach–Zehnder interferometer, involving a triggered diamond N–V colour centre photon generator, polarization, and an electro-optical modulator acting as a switchable beam splitter. Measuring in a closed configuration showed interference, while measuring in an open configuration allowed the path of the particle to be determined, which made interference impossible.

In such experiments, Einstein originally argued, it is unreasonable for a single photon to travel simultaneously two routes. Remove the half-silvered mirror at the [upper right], and one will find that the one counter goes off, or the other. Thus the photon has traveled only one route. It travels only one route. but it travels both routes: it travels both routes, but it travels only one route. What nonsense! How obvious it is that quantum theory is inconsistent!

https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser
(https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Beam_Split_and_fuse.svg/300px-Beam_Split_and_fuse.svg.png)
This diagram below is from the same Wiki article.
(https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Kim_EtAl_Quantum_Eraser.svg/602px-Kim_EtAl_Quantum_Eraser.svg.png)
Title: Re: How do microwaves behave?
Post by: Bored chemist on 22/10/2021 12:59:00
Beam splitters don't do magic. They are   very simple.
The fact that this sort exists tells you a lot.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1110&gclid=CjwKCAjwwsmLBhACEiwANq-tXItnY7Y9tZ_9NJnIlPiJWQoOVO-sbl9M3BNJYM7Fc-W_2PF5PkJzQhoCnmkQAvD_BwE
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/10/2021 16:07:41
Beam splitters don't do magic. They are   very simple.
The fact that this sort exists tells you a lot.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1110&gclid=CjwKCAjwwsmLBhACEiwANq-tXItnY7Y9tZ_9NJnIlPiJWQoOVO-sbl9M3BNJYM7Fc-W_2PF5PkJzQhoCnmkQAvD_BwE

Here's what I found in your link.
Quote
Constant Reflection to Transmission Ratio Over Range
50:50 Beamsplitters
My microwave beam splitter has different characteristics. Closer to normal angle, the reflectivity is minimum. 50-50 split is achieved around 45 degree incoming angle. So there's clearly something to learn here.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 22/10/2021 17:50:07
So there's clearly something to learn here.
Yes there is.
You need to focus on what's unusual about those beam splitters- the wavelength of the EM radiation isn't particularly important. Nor is the variation of reflection with angle.

What's important is the design.
Did you spot that?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/10/2021 23:18:53
So there's clearly something to learn here.
Yes there is.
You need to focus on what's unusual about those beam splitters- the wavelength of the EM radiation isn't particularly important. Nor is the variation of reflection with angle.

What's important is the design.
Did you spot that?
I'll figure it out when the experiments are done.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 08/11/2021 06:23:54
This video is the first in the interferometer experiment series. It shows the basic configuration to make sure that following/subsequent experiments are within expectations.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 10/11/2021 13:15:51
And here's the first variation, which replaces the beam splitter with a linear polarizer.
Do you find any result that's surprising yet?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 12/11/2021 09:08:51
My next planned experiment needs additional 45 degree linear polarizer. It may take a while, but I think it's worth the effort. Just like in basic interferometer, the interference effect using polarizing beam splitter would be stronger.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 13/11/2021 08:34:33
A few months ago I've made an experiment investigating microwave transmission through plasma.  At the time, I found a counterfeit money detector with UVA source from a gas discharge lamp. The experiment can show a weak but convincing difference of opacity in microwave frequency between on and off UVA lamp.
Unfortunately, the plasma inside the lamp is not the only electrically conductive material there. There's also phosphor coating inside of the lamp glass which may also change its conductivity when powered on..
Title: Re: How do microwaves behave?
Post by: Bored chemist on 13/11/2021 12:14:42
A few months ago I've made an experiment investigating microwave transmission through plasma.  At the time, I found a counterfeit money detector with UVA source from a gas discharge lamp. The experiment can show a weak but convincing difference of opacity in microwave frequency between on and off UVA lamp.
Unfortunately, the plasma inside the lamp is not the only electrically conductive material there. There's also phosphor coating inside of the lamp glass which may also change its conductivity when powered on..
It's unlikely that the phosphor is a significantly better conductor when the lamp is lit.
In the first place there's no obvious mechanism but  more importantly, if the phosphor conducted, it would short circuit the plasma and the lamp wouldn't work.

If you want to be really certain, you can buy a UV C bulb with no phosphor.
You will probably want to screen the UV it produces.

Did you check that the microwave detector is not picking up microwaves emitted by the plasma?

When microwave ovens first became popular there were some worries about microwave radiation escaping from the ovens.
So some companies started to sell microwave leakage detectors.
After a while, people realised that they had no obvious way to know if those leak detectors worked.

Fortunately, someone pointed out that a fluorescent lamp produces a small (essentially safe) amount of microwave radiation, so you can test a microwave detector by holding it very close to a working fluorescent lamp. If it registers a signal from that, it's probably going to register any significant leak from an oven.

But the point is that a fluorescent tube like the one you are using is a microwave source.

Did you check that you don't get the apparent effect with the microwave source switched off?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 13/11/2021 13:21:10
Did you check that the microwave detector is not picking up microwaves emitted by the plasma?
Yes. The microwave receiver showed nothing when the UV lamp was turned on and off, and microwave transmitter were not involved. I'll upload the video soon.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/11/2021 02:51:46
Here it is.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/11/2021 09:25:13
If you want to be really certain, you can buy a UV C bulb with no phosphor.
You will probably want to screen the UV it produces.
That's what I did last week. I've done the recording of the experiment, but the editing and uploading may take a while.
For safety precaution, I only power it up for short durations at a time.
You can wait for the video to be available. But if you have no patience or time to watch it later, you can sneak a peek at the results.

Spoiler: show

- the UV lamp doesn't produce detectable microwave.
- when unpowered, the lamp (with the gas in it) is almost completely transparent to microwave.
- when powered on, the lamp becomes slightly opaque to microwave.
 
I thus conclude that in previous experiment with UVA lamp, the phosphor coating obstructed the microwave transmission because it's partially conductive in microwave frequency. But when it's fluorescing, it becomes slightly less conductive.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/11/2021 09:51:13
Here it is.
This is a follow up of the experiment in previous video. This time the gas-discharge lamp has no phosphor coating, so the effect on the microwave transmission should be produced specifically by the phase change of gas in the lamp into plasma.


Please let me know if you want something to check or verify regarding these experiments.
Title: Re: How do microwaves behave?
Post by: Bored chemist on 24/11/2021 18:40:06
Can you measure the microwaves scattered by the plasma in the lamp when it is on?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 25/11/2021 02:30:24
Can you measure the microwaves scattered by the plasma in the lamp when it is on?

In previous experiment, I've measured the scattered microwave from a metal stick. Even though the metal stick is a very good conductor and shows appreciable opacity, the scattered microwave by the metal stick is very weak because it's dispersed to various direction. Only a small portion of the scattered microwave can get to the receiver.
So I estimate that the scattered microwave by the plasma would be too weak to measure. But the attenuation problem due to spreading out of microwave can be overcame by using an array of UVC lamps, arranged like a vertical polarizer. Perhaps 4 or 5 lamps are enough to make a mirror which would minimize the spreading out of microwave, hence the receiver can still get enough power to detect it.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 29/11/2021 04:23:07
My experiment using UVA lamp involves both changing of gas into plasma, and turning a surface to fluoresce. The next experiment using UVC removes the fluorescence part. It only feels natural if the next experiment demonstrate the effect of fluorescing surface without involving plasma. I've got some ideas, but it will take time to proceed. Stay tuned.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 05/12/2021 05:32:12
I've done the experiment using fluorescent sticker, and activated them using UVA as well as UVC lamps from previous experiments. Unfortunately the effect of fluorescence to the opacity in microwave frequency is too weak to have firm conclusions. I'm not sure if I'll upload the video.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 09/12/2021 11:35:42
Meanwhile, I've repeated the investigation on blocking mechanism of microwave using aluminum sheet 0.1 mm thick with various width from 7 to 70 mm, corresponding to around 0.25 to 2.5 wavelengths.
The results show that the sheet doesn't simply block the microwave transmission linearly to the area that it covers.
(https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=66414.0;attach=32561;image)
R means the sheet is placed at the receiver, T means it's at the transmitter.
H means the sheet is oriented horizontally, V means it's vertical.

The slope of the curve can emphasize the periodic nature of the trend.
(https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=66414.0;attach=32563)
Title: Re: How do microwaves behave?
Post by: Bored chemist on 09/12/2021 12:35:28
Did you look at the spatial distribution of the "transmitted" radiation?
You might get something like this
https://en.wikipedia.org/wiki/Airy_disk
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 10/12/2021 04:15:02
Did you look at the spatial distribution of the "transmitted" radiation?
You might get something like this
https://en.wikipedia.org/wiki/Airy_disk

I'm not sure if it's related, because I only measured the central position of the microwave beam.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 16/12/2021 15:06:38
Meanwhile, I've repeated the investigation on blocking mechanism of microwave using aluminum sheet 0.1 mm thick with various width from 7 to 70 mm, corresponding to around 0.25 to 2.5 wavelengths.
Here is the video. To reduce the filesize, I made the video smaller.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 17/12/2021 12:17:28
Just when I finished the recording, an idea occurred to me to repeat the same experiment, but the width of the sheet is oriented longitudinally. Would you like to make a guess what the result will be?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 01/01/2022 03:42:03
Here it is. If you only want to see the final result, just skip to 5:15.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 02/01/2022 13:31:19
Here is the follow up of previous experiment. The longitudinal metal sheet now acts like the tail of a quarter wavelength metal strip which blocks the microwave transversally. You can also skip to 5:05 if you want to save your time and just want to know the final results.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 03/01/2022 01:17:30
The last experimental results remind me of power transfer and impedance matching. I'll try to verify this hypothesis in the next experiment using wider strip facing  the receiver.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 04/01/2022 12:16:02
I also have recorded the experiment but the metal sheet is placed in front of the transmitter. I decided to split the video to make the results easier to follow, also to reduce the length of the video so the editing and uploading can be done faster.

Here is the follow up of previous experiment. The longitudinal metal sheet now acts like the tail of a quarter wavelength metal strip which blocks the microwave transversally. You can also skip to 5:05 if you want to save your time and just want to know the final results.
Spoiler: show

The result is notably different than previous experiment. I think it's due to the metal sheet interacts with the horn antenna of the transmitter. The case is different when the metal sheet is right in front of the receiver
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 12/01/2022 08:34:50
I also have recorded the experiment but the metal sheet is placed in front of the transmitter. I decided to split the video to make the results easier to follow, also to reduce the length of the video so the editing and uploading can be done faster.
Here is the video.
You can see the summary at 4:10 time stamp.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/01/2022 06:05:59
In these videos, the width of metal strip facing the receiver or transmitter is a half wavelength.


Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 02/02/2022 09:13:31
Here's another video demonstrating longitudinal blocking by L-Shaped 3/4 wavelength metal sheet on receiver side.

You can skip to 3:45 to see the result.

It's interesting that the trend is significantly different compared to when it's done from transmitter side. I'm editing the video, and it'll be uploaded as soon as it's done. Stay tuned.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 07/02/2022 03:59:54
Here's another video demonstrating longitudinal blocking by L-Shaped 3/4 wavelength metal sheet on transmitter side.

These seemingly boring experiments are meant to show that longitudinally oriented conductor which has no effect on propagation of light can have some effects if it's connected to a transversally oriented conductor. I have a plan to replicate this kind of experiments, but with those conductors disconnected. I guess we will still see some effects, although not as big as when they are connected.
The experiments also show that depicting light propagation as a stream of point-like particle is an over-simplification.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 07/02/2022 08:48:34
I've finished recording an experiment with double aluminum sheet, which is made of a folded sheet with a layer of plastic duct tape between the front and rear sheet to prevent direct electrical conduction. I hope to finish the editing soon so I can share it with you.

There are many ideas crossing my mind already to improve our understanding on how light behaves, especially in microwave frequency. But there's one that makes me interested to do as soon as possible. I think that polarization, especially the circular/elliptical type, is one behavior of light which is less understood, or even misunderstood by lay persons.
After many sessions of brainstorming, I made a decision to build an interferometer to demonstrate this behavior, which hopefully can help to understand it better. Based on its shape, I think I can rightly call it much greater than interferometer. It has some resemblance with the second diagram below. It will let me split the incoming microwave into vertically and horizontally polarized wave with different trajectory, and gives me control to adjust their path lengths independently.

(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.industrial-electronics.com%2Fimages%2Flaser_9-14.jpg&hash=d1764a7bd5012ff7e4a74902decdfd6c)
http://www.industrial-electronics.com/laser_9.html

With horizontally oriented metal grids replacing the beam splitters, and reflectors replacing the corner cube, I expect to get an elliptically polarized microwave in the receiver when the transmitter is rotated by 45 degree. The distance between the polarizers and the reflectors will determine the orientation as well as the polarization state of received microwave. I should be able to produce +/- 45° linearly polarized microwave, elliptically or circularly polarized microwave, either in clockwise or counterclockwise direction, by simply adjusting the distance between the polarizers and the reflectors. Let me know what you think of this idea.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 10/02/2022 08:27:13
Meanwhile, here's another experiment demonstrating blocking of microwave transmission by double layer metal sheet.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 17/02/2022 07:42:19
While preparing the much greater than interferometer, I inadvertently found interesting effects with a linear polarizer when placed between transmitter and receiver in longitudinal orientation.
I hope I can upload the video soon to share it with you.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 01/03/2022 09:09:44
While preparing the much greater than interferometer, I inadvertently found interesting effects with a linear polarizer when placed between transmitter and receiver in longitudinal orientation.
I hope I can upload the video soon to share it with you.
Here it is

Investigation on Microwave Transceiver 69: Longitudinal Polarizer
Demonstration of the effect of linear polarizer when oriented longitudinally.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 01/03/2022 09:15:19
Based on its shape, I think I can rightly call it much greater than interferometer.

Investigation on Microwave Transceiver 70 : Construction of Much Greater Than Interferometer
Design and construction of a type of interferometer to investigate deeper on polarization and phase changing
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 06/03/2022 16:12:40
When editing the experiment with double reflector, I got an idea that diagonally polarized microwave can produce interesting results. I hope to share the new video with you soon. Stay tuned.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 09/03/2022 06:49:07
When editing the experiment with double reflector, I got an idea that diagonally polarized microwave can produce interesting results. I hope to share the new video with you soon. Stay tuned.
Here it is. I hope you enjoy it.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 18/03/2022 08:42:05
Based on its shape, I think I can rightly call it much greater than interferometer.

Investigation on Microwave Transceiver 70 : Construction of Much Greater Than Interferometer
Design and construction of a type of interferometer to investigate deeper on polarization and phase changing

It turns out that the design is similar to my plan of an experiment using single photon.
https://www.thenakedscientists.com/forum/index.php?topic=68595.msg646801#msg646801
 (https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=68595.0;attach=32168;image)
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 27/08/2022 08:33:36
It's been a while since the last time I made a video on microwave transceiver. Here's a good demonstration using dipole antennae to explore the behavior of microwave when not directed by horn antenna.


Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 24/12/2022 23:42:32
I've made a new video investigating diffraction of microwave using metamaterials. Previously, it was shown that an aluminum plate, which virtually reflects all of microwave power, didn't show any observable diffraction effect. This time, we tested if diffraction effect can be observed in a partially transparent obstacle which is constructed as metamaterial. The metamaterial obstacle is made from an array of aluminum stripes. There will be some follow up videos to eliminate some uncertainties around diffraction phenomenon.
Title: Re: How do microwaves behave?
Post by: vdblnkr34 on 25/12/2022 13:15:32
Make a Macrowave gun, Nanowave gun, Pikowave gun.  Add some more magnets to see what it will do, remove them to see what it do, make a loner coil or bigger, add some iron core into it or ferrite. etc...

People able to melt metals in microwaves this days. They create dielectric wall and inside metal start melting, check you tube. Find out why it does that. And make very powerful metal melting machine, that melts anything on its way.  8)

Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 25/12/2022 16:02:48
There are already many ways to melt metals. That's not the goal of starting this thread.
Microwave was chosen due to its convenient wavelength to build metamaterials to investigate its behaviours.
Title: Re: How do microwaves behave?
Post by: vdblnkr34 on 25/12/2022 18:22:43
Ok. I have a question.

What material protects from this waves? Grounded peace of metal would be enough?
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/12/2022 05:00:01
Ok. I have a question.

What material protects from this waves? Grounded peace of metal would be enough?
Even ungrounded peace of metal sheet can prevent the wave to pass through, providing that it can generate adequate reactional electric field to cancel out the oscillating electric field of the incoming wave. In general, higher intensity wave requires thicker material to block.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 26/12/2022 05:02:05
I've made a new video investigating diffraction of microwave using metamaterials. Previously, it was shown that an aluminum plate, which virtually reflects all of microwave power, didn't show any observable diffraction effect. This time, we tested if diffraction effect can be observed in a partially transparent obstacle which is constructed as metamaterial. The metamaterial obstacle is made from an array of aluminum stripes. There will be some follow up videos to eliminate some uncertainties around diffraction phenomenon.

Here it is. I hope you enjoy it.


Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 02/01/2023 12:09:13
Edge effect on diffraction of microwave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 19/01/2023 02:14:48
I've recorded two new experiments using microwave transceiver. The first investigates the effect of polarized diffraction in microwave. The other one revisits the experiment with conjoined twin polarizer with slight change in the setup, but shows some significant results. Stay tuned.
Title: Re: How do microwaves behave?
Post by: GertrudeFranklin on 21/01/2023 17:26:12
So?
What do you have to say as a result?
We are waiting and curious.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 22/01/2023 02:52:52
So?
What do you have to say as a result?
We are waiting and curious.
I've just finished the editing. But since the videos are quite large, I"ll upload them when I get access to a reliable internet connection.

Do you really want a spoiler?
Spoiler: show

- Polarization state of the  diffracted wave is determined by polarization of the source, as well as the obstacle.  It's not so surprising if you are already informed of my other experiment on polarized diffraction of light.
- The conjoined twin polarizer can rotate polarization of incoming microwave. It should not be surprising either if we consider that ordinary polarizer can do the same.
- The sequence of polarization axis of the conjoined twin polarizers determines the transmission of the microwave.
In my previous video on conjoined twin polarizer, the electrical conduction between the two polarizers seem to remove the effect of the sequence.
Title: Re: How do microwaves behave?
Post by: GertrudeFranklin on 24/01/2023 15:25:45
Ok, I got you. I'll wait :)
Title: Re: How do microwaves behave?
Post by: GertrudeFranklin on 24/01/2023 15:26:47
Or even if there are some little spoiler details - I am ready ;D
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 25/01/2023 05:12:23
Here's the first one, showing the effect of polarized diffraction in microwave.
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 25/01/2023 05:25:58
Here's the other one.
In this video we will revisit the experiment of microwave transceiver on conjoined twin polarizers. This time the polarization axis of the transmitter is perpendicular to the receiver. It will show how much microwave polarization axis is rotated by the polarizers.

You can compare the result with previous experiment on separated twin polarizer in reply#77
https://www.thenakedscientists.com/forum/index.php?topic=66414.msg619477#msg619477
And the first experiment on conjoined twin polarizer in reply#78
https://www.thenakedscientists.com/forum/index.php?topic=66414.msg619552#msg619552
Title: Re: How do microwaves behave?
Post by: hamdani yusuf on 15/12/2023 05:32:15
And here are videos demonstrating conjoined twin polarizer

In the end of the experiment, it's shown that rotating the receiver can make the reading down to 0, which means that the microwave is linearly polarized instead of eliptical or circularly polarized.
It's been a while since these videos were uploaded. There is still questions I want to answer regarding the conjoined twin polarizer. What would happen if the second polarizer is half wavelength away from the first?
I realize that making the apparatus to answer this question would require a considerable time and effort.