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A compact optical fiber hydrophone with a fiber Bragg grating (FBG) is developed and experimentally examined. The developed FBG hydrophone exhibits linear response to a sound pressure in water with the dynamic range as wide as 90 dB. It can detect an acoustic field in the wide range of frequency : it operates at least from a few tens kHz to a few MHz. It can also measure an acoustic field with fairly good spatial resolution. Because of the simplicity in the geometry and potentially low cost in the production, an FBG is expected to offer a practically important hydrophone of high performance.

A compact optical fiber hydrophone using fiber Bragg grating.