Method of fiber interferometry zero fringe shift referencing usi

Details Method of fiber interferometry zero fringe shift referencing usi Method of fiber interferometry zero fringe shift referencing usi

1979-04-16

1981-08-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

042831440

ABSTRACT:
A method and apparatus for zero fringe shift referencing has unique appliion in an optical fiber interferometer gyroscope. Passive optical couplers introduce pulsed laser energy into the interferometer's main loop and a much smaller loop encircling a negligible area. An output signal from the smaller loop is representative of a zero rotation rate while the output signal from the much larger main interferometer loop is representative of an unknown rotation rate. The zero rotation rate and unknown rotation rate signals are compared and referenced so that there can be compensation for the response variation of the photodetectors or the source of laser energy to enable more accurate responsive readouts.

REFERENCES:
patent: 3332314 (1967-07-01), Rosenthal
patent: 4138196 (1969-02-01), Redman

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