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Fiber-optic hydrophone using a cylindrical Helmholtz resonator as a mechanical anti-aliasing filter

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Abstract

Two Michelson interferometric fiber-optic hydrophones that use panda polarization-maintaining fibers and devices have been constructed and tested. The low-frequency acoustic sensitivities of both hydrophones are 159dB re 1radμPa. One of the hydrophones tested has a small cylindrical Helmholtz resonator that has a break point near 1200Hz and a measured roll-off of approximately 50dBoctave, and it is a hydrostatic-pressure-insensitive design. This hydrophone is a prototype device for a class of sensors that can be used to eliminate aliasing in future sonar systems. To our knowledge, this is the first time that such a fiber-optic hydrophone has been reported.

© 2007 Optical Society of America

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