40khz air transducer

[minski_wit]

hello,

i have been looking for a 40khz ultrasonic air transducer for several
days..i have only come up with a hand full and each of them are
specifying a max vpp of around 200V..my guess is that this is the max
input voltage that the transducer can take before it degrades..is this
the case or am i completely wrong with my assumption..

thanks

 

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i have been looking for a 40khz ultrasonic air transducer for several
days..i have only come up with a hand full and each of them are
specifying a max vpp of around 200V..my guess is that this is the max
input voltage that the transducer can take before it degrades..is this
the case or am i completely wrong with my assumption..

Yes, more or less. Homogenous piezo crystal isn't all that usefull in
a transducer. To make it behave as you expect, it has to have a
polarization imposed on it with a high voltage perhaps at an elevated
temperature.

Run it too high in voltage, especially at an elevated temperature and
you can depolarize it.

Theoretically you could repole it, but might have difficulty doing so
without cracking it. When our apparatus wizard used to directly solder
piezo crystals into a small device, even with low temp indium solder he
would still have to repolarize them afterwards. I think an oil bath
might have been used, but could be remembering wrong.

 

[Brian]

hello,

i have been looking for a 40khz ultrasonic air transducer for several
days..i have only come up with a hand full and each of them are
specifying a max vpp of around 200V..my guess is that this is the max
input voltage that the transducer can take before it degrades..is this
the case or am i completely wrong with my assumption..

thanks

You didn't say how many your are looking for. If not too many, check out
http://www.hobbyengineering.com/SectionS.html

Brian

 

[Brian]

You didn't say how many your are looking for. If not too many, check out
http://www.hobbyengineering.com/SectionS.html

Brian

I meant to say, if you are looking for a 40 Khz ultrasonic air transducer,
using a much lower voltage.

Brian