Compound fiber-optic gyroscope using frequency discrimination

Details Compound fiber-optic gyroscope using frequency discrimination Compound fiber-optic gyroscope using frequency discrimination

G - Physics

01

C

345/10

G01C 19/64 (2006.01) G01C 19/72 (2006.01)

Patent

CA 2036137

ABSTRACT A compound high rate/low rate fiber-optic gyroscope comprising first and second optical fiber coils; an optical signal source operating at a known frequency for supplying an optical signal to the optical fiber coils; first and second couplers for coupling the optical signal from the source to both ends of each of the first and second coils so that the signal is propagated in opposite directions around each of the coils, the first and second coils being different so that the phase differences between the counter-propagating signals in the respective coils vary linearly with the rate of rotation of the coils in different rotation rate ranges in the two different coils; first and second modulators coupled respectively to the first and second coils and operating at different modulation frequencies for modulating the counter propagating signals in each of the coils; a frequency- discriminating circuit for receiving the optical signals from both ends of both of the coils and producing first and second output signals representing the phase differences between the counter-propagating signals in the respective coils; and a third coupler between the source and the discriminating circuit for coupling the signals from the source to the first and second couplers, and for coupling the signals from the first and second couplers to the discriminating circuit.

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