Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-02-01
1995-05-02
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356345, G01C 1972
Patent
active
054124727
ABSTRACT:
Clockwise and counterclockwise light beams, which have a Sagnac phase difference caused by an angular rate in an optical fiber coil, are combined into interference light, which is converted by a photodetector into an electrical signal. A sine component and a cosine component of the Sagnac phase difference .increment..PHI..sub.s in the output of the photodetector are detected by first and second synchronous detectors, respectively, and the sine component is used as the fiber optic gyro output and it is provided to a correcting signal generator to produce a correcting signal. The detected cosine component is added by an adder to the correcting signal, and the added output is compared by a differential amplifier with a reference voltage and the resulting error signal is produced. The error signal is applied to an integrating filter, the output of which is used to control the quantity of light to be emitted from a light source or the gain of the photodetector output, forming a feedback loop so that the error signal is reduced to zero.
REFERENCES:
patent: 4883358 (1989-11-01), Okada
patent: 5048961 (1991-09-01), Okamoto
Okada Ken'ichi
Usui Ryuji
Japan Aviation Electronics Industry Limited
Turner Samuel A.
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