I need a limited size SVP sensor (max dim. = 30*30*30 mm) for using sonar up to 70 meter depth. This sensor gives the exact velocity of sound in ocean exploration practices.
A1: Yes.
I know about sound velocity profile (SVP) sonars.
I know of none of those dimensions.
It would be very challenging to get all of the processing electronics into that volume - must it be that small? I imagine a hand-built SVP (Teensy JR, PZT, thermistor, SD card) would be around 100mm x 30mm x 30mm, and would need external power.
Smallest I know is Valeport UV-SVP. 140 mm long by 63 mm diameter. I suppose you've already looked at these? They (or you) could customise. About 35 mm of length is the cable entry gland unit. James Garry's minimum dimensions seem about right - a basic circuit board would be about 100 mm and the SV unit about 30 mm diameter - but I suppose you could build a stacked board and customise everything.
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