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underwater sensing
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underwater sensing

by pret5097 on Mon Jul 29, 2019 7:57 am

Have certain project idea that involves listening to underwater pressure changes/waves. Sounds like listening to a mechanical waves that propagate through the water, so I guess need a microphone that would be suitable for underwater/submerged operation and sensitive in the low frequencies range
Any hints as to what kind of microphone that can be ? Or probably other kind of sensors are more suitable for the task ?


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Re: underwater sensing

by adafruit_support_mike on Tue Jul 30, 2019 2:03 pm

What’s your frequency range of interest?

A microphone is a good choice as long as the signals you want are above about 20Hz. Below that it’s usually easier to use a speaker as the input device, and connect it to a low-impedance/high-gain amplifier. The classical solution is to use the speaker coil to drive a BJT amplifier with lots of current gain.

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Re: underwater sensing

by millercommamatt on Tue Jul 30, 2019 5:15 pm

Maybe you can by a hydrophone and DIY the rest. I don't know how you buy from these folks, but I do know their HTI-96 is used in sound traps by marine scientists:

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