Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1990-03-07
1991-09-17
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
050489615
ABSTRACT:
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.
REFERENCES:
patent: 4765739 (1988-08-01), Koizumi et al.
patent: 4796993 (1989-01-01), Sonobe et al.
patent: 4863273 (1989-09-01), Nishiura
K. Bohm et al., "Direct Rotation-Rate Detection With A Fibre-Optic Gyro By Using Digital Data Processing", Electronic Letters, vol. 19, No. 23, Nov., 1983, pp. 997-999.
Carl Cranz Gesellschaft e.V., Oberpfaffenhofen, lehrgang: "Sensoren in Inertialen Hess-und Navigationssystem", in Braunschweig, DE, Oct. 17-21, 1988.
Sumitomo Electric Industries Ltd.
Turner Samuel
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