High-sensitivity, low-noise, remote optical fiber

Details High-sensitivity, low-noise, remote optical fiber High-sensitivity, low-noise, remote optical fiber

1980-02-19

1981-11-03

Kreitman, Stephen A.

Measuring and testing

Vibration

Sensing apparatus

G02B 514

Patent

active

042978874

ABSTRACT:
An optical system which detects acoustical signals in a fluid medium such as seawater. The acoustical sensor assembly includes an acoustical sensor which is formed by two optical fibers which have different sensitivities to acoustical signals and are connected with the optical radiation conductor or conductors by use of an optical coupler which couples optical radiation into each of the optical fibers of the acoustical sensor. Since the optical fibers of the acoustical sensor have different acoustical sensitivities to acoustical signals, the phase of the optical radiation transmitted through each optical fiber of the acoustical sensor will change differently due to acoustical signals incident thereon. The optical radiation from the optical fibers of the acoustical sensor is directed back through an optical fiber to a photodetector. The photodetector produces a modulated output signal in accordance with the acoustical energy detected.

REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4235113 (1980-11-01), Carome
patent: 4238856 (1980-12-01), Bucaro et al.
J. A. Bucaro et al., "Fiber-Optic Hydrophone", J. Acoust. Soc. Am., vol. 62 o. 5, pp. 1302-1304, Nov. 1977.

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