Phase adjustable optical fiber gyro using both even order harmon

Details Phase adjustable optical fiber gyro using both even order harmon Phase adjustable optical fiber gyro using both even order harmon

1995-03-14

1997-03-04

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

056085257

ABSTRACT:
A photodetector generates an electric signal by receiving a light signal which is obtained by coupling lights having propagated through an optical fiber sensing loop in clock-wise and counter clock-wise directions, and modulated in a phase modulator. The electric signal is detected in a synchronous detection circuit to generate a fundamental wave component of the phase modulation signal, a duplicate harmonic wave component, a quadruple harmonic wave component, and an orthogonal component which is obtained in accordance with a phase shift of the quadruple harmonic wave component by one quarter period.

REFERENCES:
patent: 4883358 (1989-11-01), Okada
patent: 5459575 (1995-10-01), Malvern

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