Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: Raghavendra on 17/01/2011 10:19:55
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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.
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huh? Never heard of it. Did you mean photo-electric effect, and if not, what the hell is the physio-electric effect?
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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.
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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]
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The thin metal discs used to make bleeps in watches and toys (http://en.wikipedia.org/wiki/Contact_microphone) can generate piezoelectricity ...
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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.
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The thin metal discs (http://en.wikipedia.org/wiki/Contact_microphone)
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.
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Here's a nice clip of a piezoelectric fan in operation.
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This ultrasonic humidifier demo is impressive ...
[the transducer used will capable of delivering more power than the discs in toys/watches though)
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It's piezo not "physio ", sorry !!!! Do i get this ceramics, where do i get it ? and uh! can i find in home appliances .
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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.
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I will try it, thank u