Method and apparatus for obtaining a digital measure of absolute

Details Method and apparatus for obtaining a digital measure of absolute Method and apparatus for obtaining a digital measure of absolute

1988-01-27

1989-09-26

MaGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

048695920

ABSTRACT:
In a closed loop fiber optic gyroscope, the counter-propagating lightwaves are phase modulated by a triangular wave modulation with the triangular wave skewed to lock the phase difference between the counter-propagating waves alternately to specific values of phase difference which are greater than and less than the phase difference due to rotation. The difference in elapsed time between the up-slope and down-slope portions of the triangular wave modulation yields a measure of rotation angle, whereas such difference in elapsed time divided by total elapsed time yields a measure of rotation rate. The phase difference is further modulated about the locked values at a higher frequency, such higher frequency phase difference modulation being synchronously detected to produce a rotation rate signal component employed to generate the skewed triangular wave. Various other features are employed to light polarization errors.

REFERENCES:
"Sensitive Fiber-Optic Gyroscopes", Physics Today, 10-1981, pp. 20-22.

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