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	Fiber laser pressure sensor
	BOHNERT, KLAUS; BRANDLE, HUBERT
	2003-10-07
著作权人	ABB RESEARCH LTD
专利号	US6630658
国家	美国
文献子类	授权发明
其他题名	Fiber laser pressure sensor
英文摘要	The invention relates to a frequency-coded fiber laser pressure sensor (1) which is especially suitable for measuring isotropic pressures in oil wells. The sensor principle provided for in the invention is based on the fact that in a fiber laser (2) doped with Er a monomode or bimodal sensor fiber (5, 5a, 5b) is positioned whose pressure-related birefraction results in a frequency shift and beat frequencies between the orthogonal linear polarisation modes x, y or the spatial modes LP01 and LP11line. The beat frequencies are easily measured using a frequency counter (19). Temperature-related variations in birefraction are compensated in a differential arrangement of two sensor fiber segments (5a, 5b). Fiber-integrated Bragg gratings (4a, 4b) with low bandwidths (0.2 nm) are especially suitable as laser end reflectors. The pressure sensor (1) is characterized by a large measurement range (100 Mpa) and a high triggering capacity , (kPa), is readily multiplexed and can be housed in a very compact, light-weight and robust pressure-resistant housing (25).
公开日期	2003-10-07
申请日期	2000-11-20
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/34476]
专题	半导体激光器专利数据库
作者单位	ABB RESEARCH LTD
推荐引用方式 GB/T 7714	BOHNERT, KLAUS,BRANDLE, HUBERT. Fiber laser pressure sensor. US6630658. 2003-10-07.

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