pic microcontroller discussion list <> wrote on Thursday, May 15, 2003 1:46
PM:

> constructed.  I assume that an underwater transducer consists of (a)
> a piezo-ceramic element, resonant at the frequency the unit is going
> to use, operating as both a speaker and a microphone, (b) an
> oscillator circuit to drive the transmitter phase, (c) a pre-amp and
> receiver circuit to do the "listening," and (d) wires which run up to
> the control unit to provide DC power and also send the received
> signal back for display. Finally, (e) a protective epoxy shield to
> keep water out.

That sounds about right, but it's been over 2 years since I last worked in
that field...

The one transducer manufacturer who comes to mind is Reson (because we
worked on projects with them!), http://www/reson.dk .  They might have some
info there of interest to you.

(my work was on underwater acoustic comms in shallow water, I think the
project website is still up at http://flipper.ncl.ac.uk - there may be
other links on there which help, but it's been a while since I wrote it!)

Nigel
--
Nigel Orr, Design Engineer                 nigel@axoninstruments.co.uk
Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT
               Tel:+44 1467 622332 Fax:+44 1467 625235
                   http://www.axoninstruments.co.uk

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body