Ultrasonic Transducer Usage Question

[Jim Flanagan]

Hi...
I've come across some surplus 24KHz transducers and wanted to know if it
is possible to use them for either transmitting AND receiving. I tried
some internet searching, but was never able to get a definate answer.
It seems that vendors sell some which are meant for receiving and some
for transmitting. However, I remember, sometime in the past reading
where you COULD use a transducer as both receiver and transmitter.
Your thoughts would be appreciated.

Thanks,
Jim

 

[James Meyer]

On Mon, 14 Feb 2005 23:10:39 GMT, Jim Flanagan <jflan@tampabay.rr.com> wroth:

Hi...
I've come across some surplus 24KHz transducers and wanted to know if it
is possible to use them for either transmitting AND receiving.

99 times out of 100, you use the same transducer for both transmitting
and receiving.

Jim (the other one) Meyer

 

[Winfield Hill]

James Meyer wrote...

Jim Flanagan wrote:

I've come across some surplus 24KHz transducers and wanted to know if
it is possible to use them for either transmitting AND receiving.

99 times out of 100, you use the same transducer for both transmitting
and receiving.

Jim (the other one) Meyer

What're some examples of not being able to use 'em for transmitting?


--
Thanks,
- Win

 

The xdcrs are piezo crystals - they don't know if they are transmitting
or receiving. If you apply a voltage the crystal will deflect,
producing a physical deformation. If the crystal is deflected by an
external force it will produce a voltage output.

If have designed circuits where these xdcrs were used as both - and it
worked well. Virtually all depth finders use a single xdcr, and they
also work well.

 

[James Meyer]

On 14 Feb 2005 18:09:35 -0800, Winfield Hill
<hill_a@t_rowland-dotties-harvard-dot.s-edu> wroth:

James Meyer wrote...

Jim Flanagan wrote:

I've come across some surplus 24KHz transducers and wanted to know if
it is possible to use them for either transmitting AND receiving.

99 times out of 100, you use the same transducer for both transmitting
and receiving.

Jim (the other one) Meyer

What're some examples of not being able to use 'em for transmitting?

There are ultrasonic microphones (receiving) that are either too small
or too delicate to get any reasonable output from when used as a transmitter.

Not all transducers are piezo disks.

Jim