Interferometric fiber optic method and apparatus for obtaining a

Details Interferometric fiber optic method and apparatus for obtaining a Interferometric fiber optic method and apparatus for obtaining a

1996-04-10

1998-08-25

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356361, 25022727, G01B 902

Patent

active

057988340

ABSTRACT:
A method and apparatus for obtaining absolute static measurement values of a physical influence includes a processor which controls the operation of a laser that generates an interferometer input signal which is submitted to an optical interferometer. The interferometer includes a coupler/splitter that splits the interferometer input signal into a reference arm and a sensing arm both of which are coupled to an appropriate physical influence. The sensing arm and the reference arm detect the status of the physical influence, whereupon the coupler/splitter generates an interferometer output signal received by the processor. The processor then correlates this interferometer output signal to an absolute static measurement value of the physical influence. A splitter is also employed to segment a portion of the interferometer input signal and employ this portion to correct the interferometer input signal and the interferometer output signal as determined by the processor. The interferometer may employ a cancellation technique to remove the inclusion of undesirable physical influences during the measurement of the desired physical influence.

REFERENCES:
patent: 4767210 (1988-08-01), Kashyap
patent: 5402230 (1995-03-01), Tian et al.
patent: 5452086 (1995-09-01), Bunn

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