Interferometer gyroscope having relaxed detector linearity requi

Details Interferometer gyroscope having relaxed detector linearity requi Interferometer gyroscope having relaxed detector linearity requi

1979-06-13

1981-06-16

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

042734444

ABSTRACT:
Interferometer gyro includes a source of light which is divided into two portions. Each of the two portions is modulated with a respective frequency, one being a fixed frequency and the other being a variable frequency. The modulated light portions are then introduced into a fiber optic coil, the rotation of which about an axis of sensitivity is desired to be measured. After the light portions have traversed the optical fiber, they are each again modulated by the respective other frequency, then compared to produce a signal indicating the phase difference therebetween. The phase difference signal is integrated to produce a signal for varying the variable frequency such that the phase difference produced is null. The rate of rotation of the optic fiber about its axis of sensitivity is then determined by the comparison of the fixed and variable frequencies.

REFERENCES:
Davis et al; SPIE vol. 157, Laser Inertial Rotation Sensors, (1978), pp. 131-136; Paper Presented; Society of Photo-Optical Inst. Engineers, San Diego Conference 30 & 31, Aug. 1978.

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