Fiber optic gyroscope with alternating output signal

Details Fiber optic gyroscope with alternating output signal Fiber optic gyroscope with alternating output signal

1982-04-22

1985-01-01

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964, G01B 902

Patent

active

044914130

ABSTRACT:
A Sagnac rotation sensing interferometer that uses a Mach-Zehnder interferometer to provide incident light beams that counter-propagate through an optical-fiber loop. The Sagnac interferometer operates at maximum sensitivity for zero rotation rates when the Mach-Zehnder is adjusted so that the intensities of the incident light beams are equal. By peiodically varying the position of a mirror in the Mach-Zehnder the interferometer is switched into and out of quadrature so that the amplitude of the interferometer output signal is modulated at frequency f.sub.o. Phase sensitive detection at 2f.sub.o or multiples thereof reduces the background noise level several orders of magnitude below the level for dc operation.

REFERENCES:
patent: 3512890 (1970-05-01), McLaughlin
patent: 4248535 (1981-02-01), Pircher
patent: 4281930 (1981-08-01), Hutchings
patent: 4420258 (1983-12-01), Burns et al.
Rashleigh et al., "Alternating Current Operation of the Dual Input Fiber-ic Gyroscope", Conference, IOOC, '81, Third International Conference on Integrated Optics & Optical Fiber Comm., (Apr. 27-29, 1981).
"Fiber-Optic Rotation Sensing With Low Drift", Ulrich, Optics Letters, vol. 5, #5, May 1980, pp. 173-175.
Fiber Interferometer Gyroscope, M. N. McLandrich and H. E. Rast, SPIE, vol. 157, Laser Inertial Rotation Sensors, (1978).
Lichtleitfaser-Rotationssensor auf der Grundlage des Sagnac-Effekts Siemens Forsch.-u. Entwickl.-Ber. Bd. 9, (1980), Nr. 1, G. Schiffner.

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