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:

The test setup at the MSC cove consisted of a Meduza smart buoy, the hydrophone under test, and a laptop tasked with capturing acoustic waveforms.

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