双波长光纤测温仪的工作波长及线宽设计

介绍了一种利用钽酸锂热释电探测器实现的实用化双波长光纤测温仪。测温仪由光学接收系统、信号放大与处理系统及显示系统三部分组成。依照探测器系统的温度分辨率、R(T)～T曲线的线性度及温度灵敏度与各主要技术参数之间的关系,在考虑光路中的选择性吸收气体的影响及探测器的最小可探测功率的基础上,对其工作波长及波长带宽进行了优化设计。分析了仪器的工作波长及波长带宽对温度分辨率及测温灵敏度的影响。结果表明,在测温范围400～1300℃内,当λ1=2 1μm、λ2=2 3μm、Δλ3=20nm时,其测温精度高于0 20%。

Optimal design of working wavelength and its bandwidth of a dual-wavelength fiber-optic colorimeter

A new kind of the practical dual-wavelength fiber-optic colorimeter using LiTaO_3 pyroelectric detector is presented. This instrument consists of three parts: optical receiving system, signal amplifying and controlling system, and display system. According to the relationships between various technical parameters and main specifications (temperature resolving power of the detector system, linearity and temperature measurement sensitivity of R(T)～T curves), an optimal parameter selection for determining two operating wavelengths and its bandwidth of this instrument is presented. The effects on temperature resolving power and measurement sensitivity by the two operating wavelengths and its bandwidth are analyzed. The temperature measurement accuracy is better than 0.20% at 400～1300℃, λ_1=2.1μm,λ_2=2.3μm and Δλ_3=20nm.