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Hi!
I have a couple of 6mm x 6mm x 50mm transducer elements made out of PZT27. Yesterday I made some quick measurements with them, and I thought I'd share the results with anyone who's interested...
The capacitance was about 5.1nF, and the Q-value at 200kHz was 2.98. I also measured the frequency response (actually the impedance vs. freq) of the transducer element. The results can be seen at my web-page (two sweeps, one from 0 to 500kHz and the other from 100 to 300kHz):
http://www.hut.fi/~jkaasine/ss/Pzt27a.gif
http://www.hut.fi/~jkaasine/ss/Pzt27b.gif
The thickness-mode resonance at 200kHz can be clearly seens, as well as the other ("widhtness-mode") resonance at around 260kHz. The "spike"-transmitter, if used, should be tuned to the wanted frequency.
The scale is in decibels in both pictures.
-Jussi
p.s. according to the several different sources I've talked to the received signal level varies from 10uV's/100uV's to some 100's of millivolts.