Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1993-04-26
1995-01-31
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
053862902
ABSTRACT:
Light is supplied as clockwise and counterclockwise light beams to both ends of an optical fiber coil, the clockwise and counterclockwise light beams having propagated through the optical fiber coil interfere with each other, and the interference light is converted by a photodetector into an electrical signal. Both light beams are phase modulated by a phase modulator and the phase modulation frequency component is synchronously detected by a synchronous detector, from which a signal corresponding to an input angular rate is output. A reference signal generator generates a first reference signal of an odd harmonic frequency of the phase modulation frequency and a second reference signal of an even harmonic frequency of the phase modulation frequency. A change-over switch responds to a diagnosis instruction signal to selectively supply either one of the first and second reference signals to the synchronous detector. The synchronously detected output obtained with the second reference signal is output as a self-diagnosis signal, and a diagnosis circuit makes a diagnosis by determining whether the level or frequency of the self-diagnosis signal is within a predetermined range.
REFERENCES:
patent: 4796993 (1989-01-01), Sonobe et al.
Pat. Abstracts of Japan, vol. 16, No. 348 (P1393) Jul. 28, 1992 Koichi "Signal Proc. System for Optical Fiber Gyroscope".
Patent Abstracts of Japan, vol. 15, No. 382 (P1257), Sep. 26, 1991 Kenji "Correcting System for Phase Modulation Opt. Fiber Gyro".
Pat. Abstracts of Japan, vol. 15, No. 495, Dec. 13, 1991 (P1288) Koichi "Automatic Phase Adj. Circuit in Opt. Fiber Gyroscope".
Pat. Abstracts of Japan, vol. 16, No. 241 (P1363), Jun. 3, 1992, Koichi "Light Interference Angular Veloc. Meter with Fault Self-Diagnosis Function".
Japan Aviation Electronics Industry Limited
Turner Samuel A.
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