Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-08-22
1993-09-14
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
052454070
ABSTRACT:
A fiber-optic gyroscope having a depolarizer installed near the fiber coil and a polarizer disposed in the optical path before the light is divided in two partial lights to avoid the fluctuation of the light power passing reversely through the polarizer induced by the rotation of the polarization plane of the light. However, since the light emitting device emits a linearly polarized light, the light power first passing through the polarizer will fluctuate by the rotation of the polarization plane. This invention adds another depolarizer between the light emitting device and the polarizer in order to kill such a fluctuation.
REFERENCES:
patent: 4621925 (1986-11-01), Masuda et al.
patent: 4796993 (1989-01-01), Sonobe et al.
patent: 4828389 (1989-05-01), Gubbins et al.
Bohm et al, Low-Drift Fibre Gyro Using A Superluminescent Diode, Electronic Letters, May 14, 1981, vol. 17, No. 10, pp. 352 and 353.
Bohm et al, Fibre Gyro For Sensitive Measurement of Rotation, (reprint).
R. A. Bergh, H. C. Lefevre, and H. J. Shaw, "All-single-mode Fiber-optic Gyroscope", Stanford University, 1981, pp. 198-200.
Iwashita Takaki
Nishiura Yozo
Sumitomo Electric Industries Ltd.
Turner Samuel A.
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