Method for detecting fault of optical fiber gyro and apparatus f

Details Method for detecting fault of optical fiber gyro and apparatus f Method for detecting fault of optical fiber gyro and apparatus f

1997-02-04

1997-12-23

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

057011770

ABSTRACT:
A phase modulated light is propagated through an optical fiber sensing loop, from which a propagated light is obtained. The propagated light is converted to an electric signal, from which a fundamental wave component and even number harmonic wave components of a phase modulating signal for the phase modulated signal are detected. In accordance with the changes of the fundamental and even number harmonic wave components, fault is detected. On the other hand, the electric signal may be integrated to provide an integrated signal. In accordance with the comparison between the integrated signal and a fault reference voltage, the fault may be detected.

REFERENCES:
patent: 5080489 (1992-01-01), Nishikawa et al.
patent: 5108181 (1992-04-01), Nakagami et al.
patent: 5386290 (1995-01-01), Okada
patent: 5412472 (1995-05-01), Okada et al.

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