摘要
A novel fiber Bragg grating(FBG) sensor with simultaneous sensing of displacement and temperature is presented.The FBG is affixed on the cantilever inclinedly.The midpoint of FBG exactly coincides with the zero strain layer of a rectangular beam.The vertical displacement can be measured by the broadened bandwidth of FBG as the bandwidth is insensitive to temperature,while the temperature can be measured by the center wavelength shift as the wavelength shift is insensitive to vertical displacement.With 0.1 nm spectral resolution of the analyzer,sensitivities of bandwidth-displacement and center wavelength-temperature are 0.48 nm/mm and 0.05 nm/℃,resolutions are 0.2 mm and 2.0 ℃,and sensing ranges of displacement and temperature are up to 8.5 mm and 45℃ respectively.Experimental results match theoretical analyses very well.
基金
supported by the National High Technology Research and Development Program of China (No.2007AA03Z413)
the National Natural Science Foundation of China (No.60727004)
the Shaanxi Province "13115" Major Scientific and Technological Innovation Works Special Project (No.708087)
the Major Science and Technology Project of Ministry of Education of China (No.Z08119)
the Innovation Foundation of the Petro China (No. 2008D-5006-03-08)
the Shaanxi Provincial Department of Education Project (No.09JS041)
