Rotation rate measuring instrument

Details Rotation rate measuring instrument Rotation rate measuring instrument

1985-12-02

1987-11-03

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01C 1964

Patent

active

047040327

ABSTRACT:
A rotation rate measuring instrument is disclosed in which two light beams propagate through a coiled optical fiber in opposite directions. After passing through the optical fiber, the two light beams are combined and directed onto a photodetector. One of the light beams is phase-modulated in a phase-modulator before entering the optical fiber. The modulation frequency is f.sub.m. The output signal of the photodetector is fed to a variable-gain amplifier whose output signal is separated into a signal of frequency f.sub.m and a signal of frequency 2f.sub.m. The rotation rate is derived from the signal of frequency f.sub.m. The signal of frequency 2f.sub.m is applied to a detector whose output is fed to an operational amplifier. The other signal applied to the operational amplifier is a reference signal of amplitude U.sub.R. The operational amplifier controls the gain of the variable-gain amplifier in such a way that the output signal of the detector has the same amplitude as the reference signal U.sub.R.

REFERENCES:
patent: 3522739 (1970-08-01), Coor et al.

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