Fiber optic rotation sensor utilizing a magnetic shield and an o

Details Fiber optic rotation sensor utilizing a magnetic shield and an o Fiber optic rotation sensor utilizing a magnetic shield and an o

1981-11-09

1987-06-09

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 202, G01C 1964

Patent

active

046716580

ABSTRACT:
A fiber optic rotation sensor, employing the Sagnac effect, comprises all fiber optic components, positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator for phase modulating light waves which counterpropagate through a loop formed in the fiber optic strand. The modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal. The rotation sensor is mounted in a .mu.-metal housing to shield it from the effects of ambient magnetic fields. An isolator is utilized to prevent the optical output signal from returning to the laser source. This advantageously reduces power losses in the system by eliminating the need for a coupler to couple the output signal to a detector.

REFERENCES:
patent: 3890047 (1975-06-01), Warner
patent: 4280766 (1981-07-01), Goss et al.
patent: 4299490 (1981-11-01), Cahill et al.
patent: 4352563 (1982-10-01), McLandrich
patent: 4480915 (1984-11-01), Arditty et al.
"Single-Mode Fiber-Optical Power Divider; Encapsulated Etching Technique", S. K. Sheem, et al., Optics Letters, vol. 5, No. 1, Jan. 1979, pp. 29-31.

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