Complementary interferometric hydrophone

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type

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350 9629, 356345, H04R 2300

Patent

active

047992026

ABSTRACT:
A cylindrical interferometric hydrophone having an axial hollow free-flooded volume includes an outer fiber wrap for a sensor leg and an inner fiber wrap for a reference leg. Both inner and outer fiber wraps are wound on elastomers and exposed to seawater for sensing acoustic signals. In operation an increased pressure shortens the outer wrap and lengthens the inner wrap. This use of both the sensor and the reference legs to detect signals gives increased sensitivity.

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Jackson et al., Elimination of Drift in a Single Mode Optical Fiber Interometer Using a Piezoelectrically Stretched Coiled Fiber, Applied Optics, vol. 19, No. 17, 9/1/80, pp. 2926-2929.
Carome et al., Optical Fiber Acoustic Sensor, Conference Fiber Optics Advances in Research and Development, Kingston, RI, Jun. 19-23, 1978, pp. 657-676.

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