An improved optical branching/coupling unit for an optical fiber

Details An improved optical branching/coupling unit for an optical fiber An improved optical branching/coupling unit for an optical fiber

1991-04-26

1993-05-04

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

385 12, G01C 1972

Patent

active

052086526

ABSTRACT:
In an optical fiber gyroscope, the sensitivity thereof is optimized with a phase bias afforded by utilizing the phase characteristics of an optical branching/coupling unit. Further, the fluctuation of the intensity of a light source and the error and secular change of the phase characteristics of the optical branching/coupling unit are compensated by an electronic circuit. Moreover, an optical fiber loop is located in a heat insulation casing so as not to be affected by an ambient temperature change, thereby to prevent the drift of the optical fiber gyroscope attributed to an temperature change. Thus, the optical fiber gyroscope of high measurement accuracy is provided.

REFERENCES:
patent: 4479715 (1984-10-01), Sheem
patent: 4702599 (1987-10-01), Moha
patent: 4915503 (1990-04-01), Pavlath
"Fiber Optic Rotation Sensor Laboratory Performance Evaluation", Goldstein et al, Optical Engineering Jul. 1979, pp. 381-383.

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