Optical apparatus based on measurement of phase or frequency shi

Details Optical apparatus based on measurement of phase or frequency shi Optical apparatus based on measurement of phase or frequency shi

1986-01-23

1988-08-23

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964, G01B 902

Patent

active

047657405

ABSTRACT:
Optical apparatus, particularly useful as an optical gyro for measuring rotation, comprises a light source, an optical system defining a closed-loop optical path, an optical-wave-mixer producing form the light source beam an oscillating beam in the closed-loop optical path, and a circuit for measuring the phase or frequency shift produced in the oscillating beam by the optical-wave-mixer resulting from the non-reciprocal or reciprocal phase-shift thereof. A mathematical analysis is set forth showing how the non-reciprocal phase-shift is related to the frequency shift, so that the frequency shift provides a measurement of the non-reciprocal phase-shift, which depends on the rotation of the closed-loop ring optical path, thereby enabling the apparatus to serve as an optical gyro.

REFERENCES:
patent: 4410275 (1983-10-01), Shaw et al.
patent: 4659223 (1987-04-01), Huignard et al.
"New Optical Gyro Based on the Ring Passive Phase Conjugator", Fischer et al., Applied Physics Letters, 7-1985, pp. 1-3.
"Image Transmission and Interferometry with Multimode Fibers using Self-Pumped Phase Conjugation", Fischer et al., applied Physics Letters, 1-1985, pp. 113-114.
"Coherent Oscillation by Self-Induced Grating In The Photorefractive Crystal BaTiO.sub.3 ", White et al., applied Physics Letters, 3-1982, pp. 450-452.

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