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	Fiber-optic gyroscope
	NISHIURA YOZO; NISHI YASUHIKO
	1996-06-04
著作权人	SUMITOMO ELECTRIC INDUSTRIES, LTD.
专利号	CA2073423C
国家	加拿大
文献子类	授权发明
其他题名	Fiber-optic gyroscope
英文摘要	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.
公开日期	1993-01-13
申请日期	1992-07-09
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/36097]
专题	半导体激光器专利数据库
作者单位	SUMITOMO ELECTRIC INDUSTRIES, LTD.
推荐引用方式 GB/T 7714	NISHIURA YOZO,NISHI YASUHIKO. Fiber-optic gyroscope. CA2073423C. 1996-06-04.

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