Method and apparatus for measuring rate of rotation by the sagna

Details Method and apparatus for measuring rate of rotation by the sagna Method and apparatus for measuring rate of rotation by the sagna

1985-07-19

1987-10-27

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964, G01B 902

Patent

active

047026014

ABSTRACT:
Method and apparatus for angular rate measurement and digital angular rate readout by means of a fiber interferometer using the Sagnac effect. Three component light beams are generated by means of an acousto-optical modulator which is operated in the Raman-Nath region. One component light beam is introduced unmodulated in a first direction into a fiber coil while the second and third component light beams are introduced with raised and lowered frequencies, respectively in the opposite direction. After passing through the coil, the component light beams are received by a photodetector and fed to controllers for generating the differential frequencies. Weighted, the differential frequencies are subtracted from each other or summed and evaluated as the angular rate and/or measures of the temperature of the fiber coil.

REFERENCES:
patent: 4429573 (1984-02-01), Walker
patent: 4514088 (1985-04-01), Coccoli
patent: 4573795 (1986-03-01), Auch et al.

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