Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1986-10-09
1988-11-29
Willis, Davis L.
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, G01B 902
Patent
active
047877413
ABSTRACT:
There is provided a fiber optic sensor for sensing environmental effects on counterpropagating light beams in an optical loop by comparing the modulation of the light beams in an optical coil exposed to the environmental effects and comparison with a reference fiber shielded from the environmental effects. The counterpropagating light paths contain optical phase modulators for creating nonreciprocal phase shifts and may comprise elongated sections forming a long line array.
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Cahill Richard F.
Michal Ronald J.
Theriault John P.
Udd Eric
Watanabe Steven F.
Finch George W.
Hudson, Jr. Benjamin
Koren Matthew W.
McDonnell Douglas Corporation
Scholl John P.
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