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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