Fiber optic sagnac interferrometer with digital phase ramp reset

Details Fiber optic sagnac interferrometer with digital phase ramp reset Fiber optic sagnac interferrometer with digital phase ramp reset

1991-02-06

1992-06-23

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051237415

ABSTRACT:
A fiber optic interferrometer rotation rate sensor is reset by phase ramp via a digital control circuit using as demodulation signal within the control circuit a signal (d) that is statistically independent of all parasitic signals and originates from a modulation signal generator that includes a random number generator. A reversal of the phase modulator signal is provided in a statistically distributed manner to integral values of .pi./2 of the interferometer characteristic. The arrangement avoids deadband and removes scale factor nonlinearities, particularly at low rates of rotation.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 5039220 (1991-08-01), Arditty et al.
"Progress in Optical Fiber Gyroscopes Using Integrated Optics", Lefevre et al., 1986.

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