Single stage demodulator with reference signal phase dither

Details Single stage demodulator with reference signal phase dither Single stage demodulator with reference signal phase dither

1990-07-02

1992-10-27

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051595753

ABSTRACT:
A fiber optic rotation sensor includes a fiber optic coil with light beams counterpropagating therein where the beams are phase modulated with a squarewave carrier at the coil eigenfrequency. The beams recombine at the coil output with a resultant optical intensity which is a measure of the change in sensor rotation rate. The recombined signal also contains an error component due to squarewave carrier imperfections which cause high frequency spikes in the modulated rate signal resulting in rotational rate bias errors. The rotational rate bias errors are reduced by demodulating the modulated rate signal with a demodulator reference signal uniformly phase dithered about the carrier signal.

REFERENCES:
patent: 4871254 (1989-10-01), Lefevre et al.

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