Photonic-crystal-diaphragm-based fiber-tip hydrophone optimized for ocean acoustics

Onur Kilic; Michel Digonnet; Gordon Kino; Olav Solgaard

doi:10.1117/12.785919

16 May 2008 Photonic-crystal-diaphragm-based fiber-tip hydrophone optimized for ocean acoustics

Onur Kilic, Michel Digonnet, Gordon Kino, Olav Solgaard

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 700405 (2008) https://doi.org/10.1117/12.785919
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

We report a miniature fiber hydrophone that consists of a Fabry-Perot interferometer made of a photonic-crystal reflector embedded on a compliant silicon diaphragm placed at the tip of a single-mode fiber. A model was developed to show that after proper optimization to ocean acoustics, this sensor has a minimum detectable pressure that follows the minimum ambient noise of the ocean (reaching a minimum of ~10 μPa/Hz^1/2 at ~30 kHz) in the bandwidth of 1 Hz-100 kHz. By placing several such sensors with different acoustic power ranges within a single hydrophone head, the hydrophone is able of exhibiting a dynamic range in the excess of 200 dB. A prototype was fabricated, assembled, and tested that confirmed this high sensitivity and bandwidth.

Citation Download Citation

Onur Kilic, Michel Digonnet, Gordon Kino, and Olav Solgaard "Photonic-crystal-diaphragm-based fiber-tip hydrophone optimized for ocean acoustics", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700405 (16 May 2008); https://doi.org/10.1117/12.785919

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