Pressure-compensated optical acoustic sensor

Details Pressure-compensated optical acoustic sensor Pressure-compensated optical acoustic sensor

1992-06-04

1993-09-21

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367151, 367172, 356358, 73657, H04R 102

Patent

active

052474909

ABSTRACT:
There is described an optical acoustic sensor that is pressure-compensated for operation in high-pressure environments such as the deep sea and that may be employed in multi-sensor arrays. The sensor includes an acoustically responsive diaphragm that is illuminated by light conducted through an optical fiber and that reflects the light back into the fiber. Light waves reflected by the diaphragm and fiber end interfere, and the resulting interference is conducted by the optical fiber to a to a photodetector and associated signal processing electronics such as a phase generated carrier demodulator. Pressure compensation is provided to equalize the static pressure on both sides of the diaphragm. Additionally, an array of sensors is described that employs optical time division multiplexing.

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