What Determines a Transducer's operational frequency?

I have to build a device using a transducer, operating between 10KHz and 30KHz.
What Im not sure about is if all these solid state transducers differ only by the driver circuit frequency, or if there is some spec that I should pay attention to.
Ill also take parts recommendations. 1-5 watts preferably.

Top Replies

michaelkellett over 1 year ago in reply to SensoredHacker0 +2

If you are trying to detect lumps of granite embedded in a matrix of soil that's one problem, if you are trying to detect granite road chipping dust embedded in a cyclist's knee - that a a different problem…
dougw over 1 year ago +1

There are enormous numbers of transducers out there. It would be a long process just to catalogue how many operate in this frequency range. What kind of transducer are you referring to? Is it an actuator…
shabaz over 1 year ago +1

Guessing there's a chance you're talking about a loudspeaker, but 'transducer' actually means pretty much any sensor or output device. It needs a lot more clarity. Also you're actual goal; what's it being…

SensoredHacker0 over 1 year ago in reply to colporteur

maybe, but the entire process is expiramental rather than proven and well defined. Suppose I want to use resonance to detect ranges of granite, burried in various material sub-straight, with undefined depth, attenuation, and mass. thats the hand waving gist. maybe Ill start with a material with a well defined resonate frequency, and build up from there.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
michaelkellett over 1 year ago in reply to SensoredHacker0

If you are trying to detect lumps of granite embedded in a matrix of soil that's one problem, if you are trying to detect granite road chipping dust embedded in a cyclist's knee - that a a different problem.

I'm thinking more like the former - so:

Typically lumps of granite under the ground don't have resonant frequencies in a useful way. Using sound waves or vibration to locate changes in density or stiffness in underground material is well established but doesn't use air coupled transducers or rely on resonance.

(As a side issue - granite (or any other solid compound) does not have a resonant frequency in the simple mechanical sense. An artefact or sample of the material may, or may not, depending on its shape and size. Some materials are more capable of producing resonant structures than others. Hard metals are good, custard - less so)

Please stop being so cagey about the problem.

Are you looking at a mm scale or km scale problem ?

If km scale the typical source transducer is a small bomb and the detectors an array of geo-phones.

If mm scale then maybe a piezo exciter.

In between, maybe a tapping machine.

MK
Cancel
Vote Up +2 Vote Down

Sign in to reply

Cancel
colporteur over 1 year ago in reply to michaelkellett

Mention substrate an a bright mind shines through:)
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
anniel747 over 1 year ago in reply to SensoredHacker0

How di you determine this range?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
SensoredHacker0 over 1 year ago in reply to michaelkellett

any DIY references to Using sound waves or vibration to locate changes in density or stiffness in underground material ?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
michaelkellett over 1 year ago in reply to SensoredHacker0

You will need to do a lot of research.

Here's a start:

https://geologyscience.com/geology-branches/geophysics/the-seismic-method/

MK
Cancel
Vote Up +1 Vote Down

Sign in to reply

Cancel