G - Physics – 01 – C
Patent
G - Physics
01
C
G01C 19/66 (2006.01) G01C 19/72 (2006.01) G02B 6/34 (2006.01)
Patent
CA 2073423
A fibre-optic gyroscope is provided herein for measuring an angular velocity of a fibre coil by propagating light beams clockwise and counterclockwise in a specified fibre coil, by detecting an intensity of an interference beam, and calculating a phase difference between a clockwise propagated beam and a counterclockwise propagated beam. The fibre-optic gyroscope includes a light source for emitting a quasi-monochromatic light beam. A photodetector is provided for detecting an intensity of the interference beam. A defined plurality of fibre paths are interconnected in a specific defined manner, with a polarizer, a first depolarizer and a second depolarizer as well as a first coupler and a second coupler being provided in specified fibre paths. The depolarizers are constructed by coupling a polarization- maintaining fibre to the front end and/or the rear end of the polarizer at a 45° inclin- ation angle between principal axes of the polarizer and the polarization-maintaining fibre. The polarization-maintaining fibre has a difference of optical paths between the quasi-monochromatic beam and the interference beam with different principal axes being longer than a coherent length of the light source.
Nishi Yasuhiko
Nishiura Yozo
Borden Ladner Gervais Llp
Sumitomo Electric Industries Ltd.
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