Ted writes:
>>I want to conduct some 'tests' using very high frequency sound waves
produced from a small or very small source.
I keep hearing the word 'transducer' used, but have never really understood
what a 'transducer' is.
Can someone please advise me of what is the best apparatus for producing
this type of sound. I would need to be able to adjust frequency and,
ideally, control the phases of more than one output (i.e. to create
interference patterns).
<<
Here is a dictionary definition of the word "transducer":
trans*duc*er (noun)
First appeared 1924
: a device that is actuated by power from one system and supplies power
usually in another form to a second system <a loudspeaker is a tranducer that
transforms electrical signals into sound energy>
I believe you are describing making high frequency sound waves using
Ultrasonic Transducers. Usually they are based on a Piezo Electric material
- usually a crystalline substance (mineral) that contracts when a voltage is
applied across the correct direction of the material. (the reverse is also
true - applying pressure to such materials, causes them to produce a voltage).
For some more thorough information and products see the following:
http://www.designinfo.com/kistler/ref/tech_theory_text.htm
http://www.imasonic.com/Main.php3?F=0&U=Homepage.htm
http://www.airmar.com/ultra/f_ultra.htm
http://www.ndt.net/wshop/wshop_tr/trans_li.htm
http://www.piezo.com/index.html
In addition, you will find many more sites if you do searches based on the
word Ultrasonic. (transducers, power supplies, drivers, etc.)
I hope this helps.
Sincerely,
DMBoss1021
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