Coherence selective fiber optic interferometric sensor system

Details Coherence selective fiber optic interferometric sensor system Coherence selective fiber optic interferometric sensor system

1989-12-27

1992-03-10

Turner, Samuel

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, 25022719, G01B 902

Patent

active

050945343

ABSTRACT:
A fiber optic interferometric sensor system utilizing a reference transducer and an optical source having a very short coherence length, typically about 80 microns. The optical source is used to activate a remotely located fiber optic sensor which has an optical path defference between two reflecting surfaces such that the reflected optical beams are incoherent for the optical source used. The reflected beams are then coupled to a reference transducer, located remotely from the sensor and preferably near the electronic processing circuitry. The reference transducer is designed with an optical path length difference to produce a coherent combination for the optical path length differences of both the sensor and the reference transducer thereby forming a highly sensitive interferometer.

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patent: 4772786 (1988-09-01), Langdon et al.
patent: 4918492 (1990-04-01), Ferdinand et al.
Brooks et al. Coherent Multiplexing of Fiber-Optic Interferometric Sensors, IEEE Journal of Lightwave Technology, vol. LT-3, No. 5 (Oct. 1985).
Bush et al. Synchronous Phase Detection for Optical Fiber Interfermetric Sensors, Applied Optics vol. 22, No. 15, p. 2329 (Aug. 1, 1983).
Chen et al--Short-Coherence-Length and High-Coupling-Efficiency Pulsed Diode Laser for Fiber Optic Sensors--Optics Letters, vol. 3, No. 8 at p. 628 (Aug. 1988).

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