Optical sensing system

Details Optical sensing system Optical sensing system

1980-06-03

1982-06-15

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With polariscopes

350385, G01J 400, G02B 523

Patent

active

043347819

ABSTRACT:
In an optical sensing system, a phase-comparator compares the phase of an output light beam detected by a photo-detector with an input light beam as to whether those are in-phase or out-of-phase, and senses a magnitude of a physical quantity to be measured, which modulates the input light beam. The light produced by the light source is splitted into two light beam components and modulated in its light-intensity by the physical quantity. Both the light beam components are given a time difference .tau.(=(2m+1)/2f, where m=1, 2, . . . n) therebetween, are mixed again and are supplied to the photo-detector.

REFERENCES:
patent: 3302028 (1967-01-01), Sterzer
patent: 3906343 (1975-09-01), Feldtkeller
Taylor et al., "Electrooptic Analog-to-Digital Conversion Using Channel Waveguide Modulators", Technical Digest, TUC-1, Topical Meeting on Integrated and Guided Wave Optics, 1978.
Control Engineering, vol. 26, No. 2, Feb. 1979, K. James et al., "Fiber Optics: the Way to True Digital Sensors", pp. 30-33, Whole Document.
Proceedings of the 1978 International Optical, Computing Conference, London, May 9, 1978-1979 Ed. IEEE.
H. Taylor, "Fiber and Integrated Optical Devices for Signal Processing", pp. 198-202, pp. 198-200; FIG. 1.
Optices Communications, vol. 27, No. 3, Dec. 1978, Amsterdam NL.
H. Bartelt, "Wavelength Multiplexing for Information Transmission", pp. 365-368, Whole Document.
Applied Optics, vol. 17, No. 22, Nov. 15, 1978, New York U.S., B. Danielson, "Optical Fiber Phase Discriminator", pp. 3665-3668.

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