Coherence selective sensor system

Details Coherence selective sensor system Coherence selective sensor system

1993-03-08

1996-05-14

Hille, Rolf

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, 25022719, G01B 902

Patent

active

055173039

ABSTRACT:
A fiber optic interferometric sensor system utilizing a reference transducer and an optical source having a short coherence length in comparison to the optical transit time through the sensor. The optical source is used to interrogate a remotely located fiber optics sensor which has an optical path difference between two reflecting surfaces or between one reflecting surface and a beam transmitted through the sensor such that the optical beams are incoherent for the optical source used. The reflected and transmitted 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.

REFERENCES:
patent: 4767164 (1988-08-01), Yeung
patent: 5094534 (1992-03-01), Cole et al.
patent: 5271030 (1993-12-01), Chinen
patent: 5323229 (1994-06-01), May et al.
Appl. Phys. Lett. 41(7), Oct. 1, 1982, "Passive Stabilization Scheme for Fiber Interferometers Using (3.times.3) Fiber Directional Couplers", Koo, et. al., 616-618.
Applied Optics, vol. 22, No. 15, "Synchronous Phase Detection For Optical Fiber Interferometric Sensors", Jeffrey Bush et al., pp. 2329-2336.
Journal of Lightwave Technology, vol. LT-3, Oct. 1985, "Coherence Multiplexing of Fiber-Optic Interferometric Sensors", J. L. Brooks et al., 1062-1072.
Optics Letters, vol. 13, No. 8, Aug. 1988, "Short-Coherence-Length and High-Coupling-Efficiency Pulsed Diode Laser for Fiber-Optic Sensors", Wei-Kuo Chen et al., pp. 828-830.
"Multilayer Piezeoelectric Actuators", product flier, pp. 4-5.
NSG America, Inc., "SELFOC Micro Lens Options", p. 14.
United Technologies Photonics, Preliminary Data Sheet, "High Frequency Intensity Modulators", 8 pages.
"Modulator Frequency . . . ", Order sheet.
GEC-Marconi Materials Technology, Advanced Product Infor. Issue 3 Dec. 1992, "GaAs Modulator 1540 nm LC 1376".
GEC-Marconi Materials Technology, Product Information, "GaAs Modulator 1310nm LC 1375".
Crystal Technology, "OGW Phase Modulators With Fiber Optic Pigtails For High-Speed Phase Modulation of Light".
Crystal Technology, "OGW Phase Modulators For High-Speed Modulation of Light".

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