Fiber optic gyroscope including a 3.times.3 coupler and a contra

Details Fiber optic gyroscope including a 3.times.3 coupler and a contra Fiber optic gyroscope including a 3.times.3 coupler and a contra

1992-10-19

1994-12-13

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

053733614

ABSTRACT:
A fiber optic gyroscope of the type having a 3.times.3 coupler located between a light source and a monomode fiber coil, coupling nonpolarized light into the coil end, and at least one photodetector element associated with the coupler to generate an output signal corresponding to the light intensity transmitted by the coupler. At least one contrast-adjusting element in the form of a rotationally polarizing fiber section is located between the connection on the coil side, of the 3.times.3 coupler in the length of the coil-forming monomode fiber strand. The polarization rotation angle of said fiber section is adjusted so that the output signal of the photodetector element is minimal when the gyroscope is at rest.

REFERENCES:
patent: 4342517 (1982-08-01), Johnson et al.
patent: 4372685 (1983-02-01), Ulrich
patent: 4440498 (1984-04-01), Sheem

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