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arXiv · 1004.2742

Miniature photonic-crystal hydrophone optimized for ocean acoustics

Onur Kilic·Michel J. F. Digonnet·Gordon S. Kino·Olav Solgaard
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Abstract

This work reports on an optical hydrophone that is insensitive to hydrostatic pressure, yet capable of measuring acoustic pressures as low as the background noise in the ocean in a frequency range of 1 Hz to 100 kHz. The miniature hydrophone consists of a Fabry-Perot interferometer made of a photonic-crystal reflector interrogated with a single-mode fiber, and is compatible with existing fiber-optic technologies. Three sensors with different acoustic power ranges placed within a sub-wavelength sized hydrophone head allow a high dynamic range in the excess of 160 dB with a low harmonic distortion of better than -30 dB. A method for suppressing cross coupling between sensors in the same hydrophone head is also proposed. A prototype was fabricated, assembled, and tested. The sensitivity was measured from 100 Hz to 100 kHz, demonstrating a minimum detectable pressure down to 12 μPa (1-Hz noise bandwidth), a flatband wider than 10 kHz, and very low distortion.

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Onur Kilic, Michel J. F. Digonnet, Gordon S. Kino, Olav Solgaard. 2010-12-13. Miniature photonic-crystal hydrophone optimized for ocean acoustics. https://doi.org/10.1121/1.3543949

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