Reduction of demodulator offset errors in fibre-optic gyroscopes

Details Reduction of demodulator offset errors in fibre-optic gyroscopes Reduction of demodulator offset errors in fibre-optic gyroscopes

1991-12-06

1992-07-21

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051317494

ABSTRACT:
A fibre optic gyroscope which reduces the sensitivity of the gyroscope to offsets in the demodulator, the reduction in sensitivity being achieved by modulating the radiation passing through the gyroscope by a first waveform which is derived from second and third periodic waveforms, the third waveform having a frequency substantially less than that of the second waveform in use and the second waveform having a frequency of about 1/2T where T is the time taken for the radiation to travel through the gyroscope, and detecting said radiation which is subsequently demodulated with respect to both second and third waveforms in order to minimize any offset introduced by the demodulation with respect to the second waveform.

REFERENCES:
patent: 4705399 (1987-11-01), Grandorge et al.
patent: 4707136 (1987-11-01), Kim
patent: 4836676 (1989-06-01), Kim et al.

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