摘要
设计了一种新型F-P（Fabry—Perot）干涉腔式温度传感器，具有高灵敏度、电绝缘性及抗电磁干扰等优点，能够胜任极端恶劣环境下的温度测量。采用腔内端面的反射光数学模型，并考虑输出光功率的线性度，对F-P传感腔初始腔长日、光纤端面反射率r的选取进行了优化设计与分析。应用有限元分析软件ANSYS对传感器的理论模型进行仿真与验证，模拟结果显示，当待测温度的变化范围为0—100℃时，干涉腔腔长随温度近似于线性变化，相应的理论灵敏度为1．636nm／％，精度为±0．2℃。
A novel Fabry-Perot （F-P） cavity temperature sensor is presented in the paper. Due to its characteristics including high sensitivity and immunity to electro-magnetic interference, it is especially suitable for some rugged environ- ment. Mathematical model of reflected light from F-P interferential cavity is deduced. Optimal design and simulation of F-P cavity＇ s original size and the choice of optical fiber surface＇ s reflection ratio are discussed. Simulation and analysis of sensor＇ s theoretical model are realized by ANSYS. The length of the F-P cavity approximately linearly changes with the temperature when the measured temperature ranges in 0- 100℃ with the corresponding theoretical sensibility of 1.636 nm/℃ and accuracy of ±0.2℃.
出处
《仪表技术》
2014年第4期50-52,共3页
Instrumentation Technology
