Testing the Hydrophone
The NU MONET team ran tests of a hydrophone donated to the project by the MIT Sea Grant program.
We discovered that the hydrophone is an active device. One of the hydrophone’s pins requires a 5 V input to power an internal amplifier.
Once the signal has passed through the cable, it is fed to one of the inputs on a Roland Quad Capture. An additional 20 dB of gain is applied before conversion to minimize quantization noise. The USB signals from the Quad Capture are wirelessly transmitted to a laptop running MATLAB/Simulink for recording.
Here is an excerpt of the recording we made with the hydrophone: