根据液体折射率随温度变化而改变的特性,提出了一种基于表面等离子体波共振(SPR)效应的新型光纤温度传感器,分析了表面等离子体波共振光纤探头感应环境温度变化的原理。对表面等离子体波共振探头结构进行了优化设计,并进行了相关实验,为实现高折射率液体介质的感温测试和扩大测温范围提供依据。通过自行设计的一套光纤温度传感测试系统,得到系统输出的表面等离子体波共振光谱信号随温度变化的特性曲线,并提出对共振波长和最小光强反射率进行实时双参数测量的方法。实验结果表明,该测试系统具有结构简单、全光纤化、易远程测量等优点。

Liquid refractive index changes when temperature changes. According to this theory, a novel optical fiber optical temperature sensor based on surface plasmon resonance (SPR) is presented in this paper. And the theory of the SPR probe testing the change of environmental temperature is analyzed. The structure of SPR probe is optimized in order to measure the temperature of liquid with high refractive index and enlarge the measurement range, The characteristic curve of SPR spectrum changing with temperature is obtained by using a optical fiber SPR temperature testing system. A real-time double-parameter measure method, based on resonance wavelength λspr and the lowest light intensity reflectivity Rmin, is also presented. The experimental results show that this sensing system features simple structure, all light transmitted by fiber, and easiness to realize long distance measurement.