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Multimode fiber-optic hydrophone based on the photoelastic effect

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Abstract

A multimode fiber-optic hydrophone based on the photoelastic effect is described. The device offers the advantages that it is simple, low cost, sensitive, inherently solid state, rugged, and exploits a differential approach for amplitude noise reduction. A minimum detectable pressure of 47 dB re 1 μPa/Hz1/2 has been demonstrated at 500 Hz, and calculations based on photoelastic material properties indicate that a minimum detectable pressure as low as 15 dB re 1 μPa/Hz1/2 might be achieved. This device design, therefore, represents an attractive technique for making a practical multimode fiber-optic hydrophone.

© 1982 Optical Society of America

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Equations (11)

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