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Author Topic: What kind of ceramic displays a piezo electric effect?  (Read 6955 times)

Offline Raghavendra

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   What kind of ceramic displays physio-electric effect? using this ceramic, and  sound waves can i evaporate water ,

  Does household ceramics, display physio-electric effect?




Mod edit - formatted subject as a question - please do this to help keep the forum tidy and easier to navigate.

 
« Last Edit: 19/01/2011 11:31:41 by BenV »


 

Offline QuantumClue

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #1 on: 17/01/2011 14:19:52 »
huh? Never heard of it. Did you mean photo-electric effect, and if not, what the hell is the physio-electric effect?
 

Offline Soul Surfer

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #2 on: 17/01/2011 18:40:35 »
The only reference that I could find that used this term "physio-electric effect"  was one that described the use of ultrasonics as a massage aid

Ultrasonics has been used as a help to heal damage in physiotherapy but it should only be used by experienced people with care because it can cause damage

The problem is complicated by the fact that the ultrasonic waves are usually generated by  Piezo electric materials  these are often ceramics.

a frequently used ceramic for piezo electric ultrasonic transducers is Barium Titanate and I have in the pas worked with it on ultrasonic scanning devices.

This is likely to be what our questioner wants to know about.

The answer therefore is only specialised ceramics show Piezo electric properties and the sort of ones you use depends on precisely what you want to do.

When you are talking about evaporating water you may be thinking of these "fairy mist" devices  which probably use ultrasonics to fire small particles of water from the surface of a fountain or other water feature.  these could probably use piezo electric transducers.
 

Offline Geezer

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #3 on: 17/01/2011 18:59:00 »
When you are talking about evaporating water you may be thinking of these "fairy mist" devices  which probably use ultrasonics to fire small particles of water from the surface of a fountain or other water feature.  these could probably use piezo electric transducers.

Yes - some humidifiers operate on that principle. They're a pain in the neck too. If you don't put distilled water in them, they cover everything in a layer of mineral dust  :D
 

Offline RD

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #4 on: 17/01/2011 19:34:29 »
The thin metal discs used to make bleeps in watches and toys can generate piezoelectricity ...
« Last Edit: 18/01/2011 02:28:59 by RD »
 

Offline Soul Surfer

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #5 on: 18/01/2011 17:32:21 »
Those discs are not metal they are piezoelectric ceramics with metal electrodes on them they are used as capacitors in a resonant circuit at the audio frequency that they emit.  they could also be used as transmitters at different (possibly ultrasonic) frequencies, microphones and other sorts of pressure detectors depending on what sort of circuit you put them in.
 

Offline RD

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #6 on: 18/01/2011 19:56:58 »
The thin metal discs

The “thin metal discs” description was for identification purposes: they are more metal than anything else.
The incorporated link explained that it was the ceramic layer which generated the piezoelectricity.

The original poster was looking for household items which were piezoelectric, the discs can be found in wristwatches or toys which bleep.
 

Offline Geezer

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #7 on: 18/01/2011 20:39:19 »
Here's a nice clip of a piezoelectric fan in operation.

 

Offline RD

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #8 on: 18/01/2011 22:20:33 »
This ultrasonic humidifier demo is impressive ...
feature=related

[the transducer used will capable of delivering more power than the discs in toys/watches though)
 

Offline Raghavendra

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Re: What kind of ceramic displays a piezo electric effect?
« Reply #9 on: 19/01/2011 08:56:01 »
It's piezo not "physio ", sorry !!!! Do i get this ceramics, where do i get it ? and uh! can i find in home appliances .
 

Offline imatfaal

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What kind of ceramic displays a piezo electric effect?
« Reply #10 on: 19/01/2011 12:27:39 »
The easiest way to get hold of a small piezo-electric object is a cigarette lighter.  The sort without a flint and a wheel often have a sprung button you press which causes the spring to force a hammer against a small piezo-electric object.  If you disassemble this sort of lighter you get a  2-3cm or so long cylinder about 7mm round - this will have two wires coming out which when the mechanism is pressed will generate a nice spark.
 

Offline Raghavendra

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What kind of ceramic displays a piezo electric effect?
« Reply #11 on: 20/01/2011 11:17:34 »
 I will try it, thank u
 

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What kind of ceramic displays a piezo electric effect?
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