Nonreciprocal phase shift fiber-optic gyrometer

Details Nonreciprocal phase shift fiber-optic gyrometer Nonreciprocal phase shift fiber-optic gyrometer

2007-03-06

2007-03-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Rotation rate

Reexamination Certificate

active

10477360

ABSTRACT:
The present invention relates to a fiber-optic gyrometer including a Sagnac interferometer using two light waves propagating in opposite directions in a interferometer loop including a photodetector which delivers an electrical signal Ud representing the light intensity of the interference between the two waves, and for optically phase-shifting the waves controlled by a square-wave modulation signal Um suitable for controlling an optical phase variation at a frequency FO substantially equal to 1/(2to), where tois the propagation time of a wave through the guide. The photodetector is connected to at least a first sampling circuit and a second sampling circuit which are controlled in phase opposition by a clock. The gyrometer includes a means for inverting the phase of the clock at a frequency f, which is very much less than the frequency FO.

REFERENCES:
patent: 5116129 (1992-05-01), Ishigami

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