Optical fiber gyro

Details Optical fiber gyro Optical fiber gyro

1994-04-05

1995-11-28

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

054713013

ABSTRACT:
In an optical fiber gyro for detecting a rotation angular velocity by Sagnac phase difference of light signals propagated through an optical fiber sensing loop, no polarizer is used, and a light source having a difference in attenuation or amplification factor between two orthogonally polarized lights is used. Alternatively, a light source is optically coupled to an optical coupler for supplying two divided light signals to the sensing loop and receiving the two light signals propagated through sensing loop by an optical fiber of a predetermined length which is set to meet a relation in which a distance difference determined by the predetermined length and a phase difference of two orthogonally polarized lights propagated through the optical fiber is greater than an interference distance of the light source.

REFERENCES:
patent: 4529313 (1985-07-01), Petermann et al.
patent: 4842409 (1989-06-01), Arditty et al.
patent: 4848910 (1989-07-01), Dupraz

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