Guo Tuan, Qiao Xueguang, Jia Zhenan, Zhao Qida, Dong Xiaoyi
Institute of Modern Optics, Nankai University, Tianjin, China.
Appl Opt. 2006 May 1;45(13):2935-9. doi: 10.1364/ao.45.002935.
Simultaneous measurement of temperature and pressure with a single fiber Bragg grating (FBG) based on a broadened reflection spectrum is proposed and experimentally demonstrated. A novel double-hole structure of a cantilever beam is designed, and a FBG is affixed on the nonuniform strain area of the cantilever beam. The Bragg reflection bandwidth is sensitive to the spatially gradient strain but is free from the spatially uniform temperature. The wavelength peak shift and the bandwidth broadening of the FBG with a change of temperature and pressure allow for simultaneous discrimination between the temperature and the pressure effects. Standard deviation errors of 1.4 degrees C and 1.8 kPa were obtained with temperature and pressure ranges of 20 degrees C-100 degrees C and 0-80 kPa, respectively. This novel and low-cost sensor approach has considerable potential applications for temperature-insensitive strain measurement.
提出并通过实验证明了一种基于加宽反射光谱的单光纤布拉格光栅（FBG）同时测量温度和压力的方法。设计了一种新型的悬臂梁双孔结构，并将一个FBG粘贴在悬臂梁的非均匀应变区域。布拉格反射带宽对空间梯度应变敏感，但不受空间均匀温度的影响。随着温度和压力的变化，FBG的波长峰值位移和带宽展宽使得能够同时区分温度和压力效应。在温度范围为20℃至100℃、压力范围为0至80kPa时，分别获得了1.4℃和1.8kPa的标准偏差误差。这种新颖且低成本的传感器方法在对温度不敏感的应变测量方面具有相当大的潜在应用价值。
