一种高精度光纤测温系统工作波长的优化设计

A High-Precision Optic Fiber Colorimeter Using Pyroelectric Detector

基于基尔霍夫定律 ,利用钽酸锂热释电探测器设计了一种实用化的双波长、高精度光纤测温系统。依照测温系统中单个探测器的温度分辨力、R(T)～T曲线的线性度、R(T)～T曲线的温度灵敏度及其相对温度灵敏度与各主要技术参量之间的关系 ,对采用钽酸锂热释电探测器作光电转换器件实现的实用化实时测温系统的工作波长进行了优化设计。实验表明 ,在测温范围 4 0 0～ 130 0℃内 ,当系统工作在λ1=2 .1μm、λ2 =2 .3μm时 ,其温度灵敏度高于 1.0× 10 -4℃ -1,相对温度灵敏度不低于 0 9,测温精度不低于 0 15 %。

Based on the Kirchhoff law, a practical dual-wavelength high-precision fiber-optic colorimeter using LiTaO 3 pyroelectric detector is presented. According to the relationships between various technical parameters and main specifications (temperature resolving power of single detector, linearity of R(T)～T curves, temperature measurement sensitivity and relative temperature sensitivity), a method of optimal parameter selection for determining two operating wavelengths of a new kind of the practical IR fiber-optic colorimeter using LiTaO 3 pyroelectric detector is presented. Experimental results show that temperature measurement sensitivity exceeds 1.0×10 -4 ℃ -1, and relative tomperature sensitivity and temperature measurement accuracy are better than 0.8 and 0.15% respectively at 400～1300 ℃ and λ 1=2.1 μm, λ 2= 2.3 μm which reach design requirements.