Light source-detection fiber-optic gyroscope using depolarized b

Details Light source-detection fiber-optic gyroscope using depolarized b Light source-detection fiber-optic gyroscope using depolarized b

1994-11-25

1996-06-11

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

055261159

ABSTRACT:
A source-sensitive gyroscope guides light beams emitted from a light emitting device into both ends of the fiber coil, makes the beams propagate in the coil clockwise and counterclockwise, and retrieves the beams into the light emitting device itself. The phase difference is obtained from the change of the driving current or the change of the driving voltage of the light emitting device, or from the change of a photocurrent of the monitoring photodetector mounted behind the light emitting device in the light source. A birefringent medium having an optical path difference longer than the coherent length of the light is interposed between the light emitting device and the end of the fiber. When the light beams are non-polarized, the birefringent medium is aligned in the orientation in which the anisotropic axis is perpendicular to the beam line. When the light beams are linearly polarized, the birefringent medium is arranged in the orientation in which the anisotropic axis inclines at 45 degrees to the linear polarization. When a polarizer is equipped in the beam line, the birefringent medium is arranged in the orientation in which the anisotropic axis inclines at 45 degrees to the linear polarization. In any case, the single birefringent medium plays the role of a substantial depolarizer.

REFERENCES:
patent: 4848910 (1989-07-01), Dupraz
patent: 5245407 (1993-09-01), Nishiura et al.
patent: 5444533 (1995-08-01), Nishiura et al.

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