Fiber optic gyro with self-diagnostic function

Details Fiber optic gyro with self-diagnostic function Fiber optic gyro with self-diagnostic function

1991-06-17

1992-04-28

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

051081814

ABSTRACT:
In a fiber optic gyro which is constituted by a negative feedback loop in which the phase difference between right-handed light and left-handed light propagating through an optical fiber coil is detected from their interference light and a ramp wave of a frequency corresponding to the detected phase difference is generated by a ramp generated and is applied to a feedback phase modulator to reduce the phase difference between the right-handed light and the left-handed light, a diagnostic signal generated by a diagnostic signal generator is applied via a combining circuit to the closed loop and the corresponding response signal is extracted therefrom. Based on the response signal, a diagnostic unit diagnoses a fault of the fiber optic gyro.

REFERENCES:
patent: 4998822 (1991-03-01), Steele

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