Performance of three hydrophone flow shields in a tidal channel

Acoustics, Biological/Ecological Effects: E. Cotter, J.R. McVey, L.E. Weicht, and J. Haxel (2024/01/10)

JASA Express Lett. 4, 016001 (2024)

Link: https://pubs.aip.org/asa/jel/article/4/1/016001/2932985/Performance-of-three-hydrophone-flow-shields-in-a

Pseudosound caused by turbulent pressure fluctuations in fluid flow past a hydrophone, referred to as flow noise, can mask propagating sounds of interest. Flow shields can mitigate flow noise by reducing non-acoustic pressure fluctuations sensed by a hydrophone. We evaluate the performance of three hydrophone flow shields (two nylon fabrics and an oil-filled enclosure) in a tidal channel with peak current speed of 1.3 m s−1. All three flow shields reduced flow noise without attenuating propagating sound below 20 kHz. The oil-filled enclosure performed best, reducing flow noise by over 30 dB at frequencies below 40 Hz.

Keywords: coustical properties, Hydrophone, Acoustic Doppler current profiler, Acoustic Doppler velocimeter, Sound level meters, Signal processing, Organic materials, Polymers, Turbulent flows, Biofouling

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