单个光纤光栅实现对位移和温度的同时测量

结合光纤光栅悬臂梁调谐的特点 ,采用一种新颖的光纤光栅悬臂梁结构 ,将光纤光栅粘贴在悬臂梁和固定端基板的结合处 ,成功地实现了对位移和温度的同时测量。基于光谱分析仪 0 1nm的光谱分辨率 ,实验可得到的位移分辨率为 0 0 8mm ,温度分辨率为 3 1℃ (位移不变时可达 0 73℃ ) ,位移测量范围可达 10 5mm。实验结果与理论分析基本一致

Simultaneous Displacement and Temperature Measurement Using One Fiber Bragg Grating

A novel displacement and temperature fiber Bragg grating(FBG) sensor based on cantilever structure is presented, and studied both theoretically and experimentally in this paper. FBG is affixed on the adjoiner between the cantilever and a fixed placode. Vertical displacement of the cantilever free end is measured by wavelength shift of FBG due to the strain action inflicted on FBG by the cantilever. The FBG section attached on cantilever is of different sensitivities to strain and temperature from that attached on the placode due to their making from different materials. Due to the spectral resolution of 0.1nm for spectral analyzer, the resolutions of displacement measurement and temperature measurement are 0.08mm and 3.1℃, respectively (the latter, with a constant displacement, might be 0.73℃), the measurement range of displacement is 10.5 mm.