High sensitivity flatted mandrel hydrophone

Lun K. Cheng; Dick de Bruijn

doi:10.1117/12.169912

9 March 1994 High sensitivity flatted mandrel hydrophone

Lun K. Cheng, Dick de Bruijn

Proceedings Volume 2070, Fiber Optic and Laser Sensors XI; (1994) https://doi.org/10.1117/12.169912
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

An axial flatted mandrel type of fiber optic hydrophone, named as Mark VI, has been constructed and tested. The sensor is based on a Michelson type interferometer and is built with polarization-maintaining fiber optic components to suppress signal fading due to changes in polarization. The sensitivity is tested in a range from 200 Hz to 1500 Hz. Up to 1000 Hz the sensitivity is found to be 275 mrad/Pa or higher. With 0.8 m of sensing fiber the normalized sensitivity is found to be -277 dB re 1/(mu) Pa, which is one of the highest ever reported. Up to 1000 Hz the noise level of the Mark VI is about 10 dB below Seastate Zero.

Citation Download Citation

Lun K. Cheng and Dick de Bruijn "High sensitivity flatted mandrel hydrophone", Proc. SPIE 2070, Fiber Optic and Laser Sensors XI, (9 March 1994); https://doi.org/10.1117/12.169912

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