Fiber optic Sagnac interferometer with carrier frequency reduced

Details Fiber optic Sagnac interferometer with carrier frequency reduced Fiber optic Sagnac interferometer with carrier frequency reduced

1991-10-22

1993-12-07

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

052687406

ABSTRACT:
A fiber optic Sagnac interferometer for measuring rotation rate includes a light source that is ON/OFF keyed in a predetermined cycle. After filtering of the readout signal in the course of demodulation, a substantially-lower readout signal carrier frequency, and, thus, corresponding-lower demodulator requirements, may be achieved. A closed loop configuration is disclosed, associated with a scale factor controlling circuit, for rotation rate sensors with keyed light sources. The invention is particularly suitable for fiber optical rotation rate sensors with short sensor coils.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.

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