Linear phase ramp type fiber optic gyro having ramp reset and re

Details Linear phase ramp type fiber optic gyro having ramp reset and re Linear phase ramp type fiber optic gyro having ramp reset and re

1992-02-25

1994-09-06

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

053453077

ABSTRACT:
The output of a synchronous detector for interference light is applied to a low-pass filter of a high cut-off frequency and a low-pass filter of a low cut-off frequency, and their outputs are compared by a comparator. When a phase cancel ramp signal by a phase cancel signal generator has reached a positive or negative threshold voltage, a reset signal generator generates a reset signal and a reset sign signal which represents at which of the positive and negative threshold voltages the reset is caused. Based on these signals, an up-down control circuit controls a counter to perform the count-up or count-down operation. The counter counts the reset signal from the reset signal generator and the count value of the counter is converted by a D/A converter to an analog correcting value. The correcting value is added by an adder to a reference level from a reference level generator. The added value is used as a positive threshold voltage V.sub.CP and the voltage V.sub.CP is polarity inverted by an inverter and the inverted output is used as the negative threshold voltage V.sub.CN.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 5031988 (1991-07-01), Okada
patent: 5166750 (1992-11-01), Ishigami

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