公开(公告)号：EP1183510A1

公开(公告)日：2002-03-06

申请号：EP00911061.0

申请日：2000-03-17

申请人： Marconi Caswell Limited

发明人： GROVES-KIRKBY, Christopher ,  BENNION, Ian ,  WILLIAMS, John ,  ZHANG, Lin

IPC分类号： G01L1/24 ,  G01D5/353

CPC分类号： G01L1/242 ,  G01B11/18 ,  G01D5/35383

摘要： A strain sensor comprises an optical waveguide (6) having a plurality of reflecting structures (Bragg gratings) along its length. Each structure reflects light at a different characteristic wavelength (μ1 to μn+1) which changes in dependence on a change of physical length of at least part of the reflecting structure. The reflectivity of reflecting structures which reflect at characteristic wavelengths which are adjacent to each other (μ1 and μ2 or μn and μn+1) are configured to be different such that the intensity of light reflected from adjacent structures can be used to discriminate between them.