Fiber optic loop interferometer and method with coincident backs

Details Fiber optic loop interferometer and method with coincident backs Fiber optic loop interferometer and method with coincident backs

1983-08-05

1986-01-14

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01C 1964

Patent

active

045642931

ABSTRACT:
Method and apparatus for improving the sensitivity of Sagnac gyroscopes and other interferometers utilizing a fiber optic loop by minimizing the effects of backscattered radiation. In one disclosed embodiment, the amplitude of coincident backscattered radiation is significantly reduced by applying the light in the form of a pulse of short duration and gating the output so that only the scattered energy from a short length of the fiber contributes to the interfering wave. The interference is reduced even further by processing or constructing the loop to eliminate the scattering sources in the short segment which can give rise to coincident backscattered power.

REFERENCES:
patent: 4088898 (1978-05-01), Stitch
patent: 4265541 (1981-05-01), Leclerc et al.
patent: 4280766 (1981-07-01), Goss et al.
patent: 4283144 (1981-08-01), McLandrich
Lin et al., "Sensitivity Analysis of the SagNac-Effect Optical-Fiber Ring Interferometer", Applied Optics, Mar. 15, 1979, vol. 18, No. 6, pp. 915-931.
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