G - Physics – 01 – C
Patent
G - Physics
01
C
345/10
G01C 19/66 (2006.01) G01C 19/72 (2006.01)
Patent
CA 2011698
In a phase-modulated fiber-optic gyroscope having as essential components a fiber-optic cable having a sensor coil portion and a portion provided with a phase modulation device, a light-emitting device that issues coherent light, a beam splitter by which the light issuing from the light-emitting device either directly or via an optical fiber is split into two beams which are launched at opposite ends of the fiber- optic cable, a light-receiving device into which the light beams that have been transmitted through the fiber-optic cable and that emerge from opposite ends thereof are launched after they are re-combined by the beam splitter, and a synchronous detector circuit that receives the output of the light- receiving device and that detects a phase-modulated frequency component, the improvement wherein the gyroscope further includes a DC component detector that receives the output of the light-receiving device and that detects the DC component of the output, a reflected light quantity setting unit that presets the level of the reflected light H in the DC component which was reflected by the edge faces of lenses, optical fiber and other parts of the optical system and which did not pass through the sensor coil, a reflected light quantity subtracting unit that subtracts the present level of reflected light H from the output D of the DC component detector, and a division performing unit that divides the output of the synchronous detector by the output R of the reflected light quantity subtracting unit and that outputs the result of the division.
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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