Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1983-04-25
1987-08-18
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964
Patent
active
046873309
ABSTRACT:
A fiber optic rotation sensor, employing the Sagnac effect comprising all fiber optic components positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator or modulators for phase modulating at first and second harmonic frequencies light waves which counter-propagate through a loop formed in the fiber optic strand. Each modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal.
A phase sensitive detector generates a feedback error signal proportional to the magnitude of the first harmonic in the output optical signal. The feedback error signal controls a modulator which controls the amplitude of the second harmonic driving signal for the second harmonic phase modulator such that the first harmonic component in the output signal from the rotation sensor is cancelled or held within a small range of amplitudes.
REFERENCES:
patent: 4299490 (1983-11-01), Cahill et al.
patent: 4372685 (1983-02-01), Ulrich
patent: 4410275 (1983-10-01), Shaw et al.
"Techniques for Shot Noise Limited Inertial Rotation Measurement Using a Multiturn Fiber Sagnac Interferometer", SPIE, Davis et al, 1978, pp. 131-136.
R. A. Bergh, et al., "All-Single-Mode Fiber-Optic Gyroscope", Optics Letters, vol. 6, No. 4, Apr. 1981.
R. A. Bergh, et al., "All-Single-Mode Fiber-Optic Gyroscope with Long-Term Stability", Optics Letters, vol. 6, No. 10, Oct. 1981.
H. C. Lefevre, et al., "All-Fiber Gyroscope with Interial-Navigation Short-Term Sensitivity", Optics Letters, vol. 7, No. 9, Sep. 1982.
R. Ulrich, "Fiber-Optic Rotation Sensing with Low Drift", Optics Letters, vol. 5, No. 5, May 1980.
"Contribution a la Gyrometrie a Fibre Optique de Class Inertielle,", Herve LeFevre, Doctoral Thesis, University of Nice, Jul. 1, 1982, pp. 187-189.
The Board of Trustees of the Leland Stanford Junior University
Turner S. A.
Willis Davis L.
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