Laser fiber optic gyroscope having phase modulation

Details Laser fiber optic gyroscope having phase modulation Laser fiber optic gyroscope having phase modulation

1994-02-25

1995-10-17

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

054595754

ABSTRACT:
In a laser gyroscope, a non-reciprocal phase modulation is introduced between the clockwise (CW) and counterclockwise (CCW) beams at a modulation frequency (f). The CW and CCW beams are combined on a detector and the intensity of the output is observed at the fundamental frequency (f) and the higher harmonics (e.g. 2f, 4f). At each frequency, the detected signal is demodulated by mixing it with a reference signal at the same frequency and stepping the phase of the signal through successive increments of 90.degree., thereby to determine the in-phase and quadrature components for each frequency monitored.

REFERENCES:
patent: 4765739 (1988-08-01), Koizumi et al.
patent: 4776700 (1988-11-01), Frigo
patent: 4871254 (1989-10-01), Lefevre et al.
patent: 4883358 (1989-11-01), Okada
patent: 5141316 (1992-08-01), Lefevre et al.
Bohm et al., Fiber Optic Gyro With Digital Data Processing, OFS '84 Conference Proceedings--2nd International Conference On Optical Fiber Sensors, Sep. 5-7, 1984, pp. 251-258.

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