可调谐二极管激光吸收光谱法测量气体温度

研究了一种新型的非接触式测温技术——可调谐二极管激光吸收光谱(TDLAS)测温技术。介绍了温度测量及调制吸收光谱技术原理,分析了调制幅度对气体温度测量的影响。优选了氧气吸收谱线对13163.78 cm-1和13164.18 cm-1,在搭建的高温实验系统上,实现了气体温度和浓度的同时测量。通过分析实测波形获得了谱线13164.18 cm-1在823~1323 K温度范围内的碰撞展宽系数和温度指数。实验结果表明,在823~1323 K温度范围内,系统温度测量的线性误差为0.65%,最大波动为±15 K。

Gas Temperature Measurement with Tunable Diode Laser Absorption Spectroscopy

A new kind of non-contact temperature measurement technique based on tunable diode laser absorption spectroscopy (TDLAS) was investigated. Temperature measurement principle and modulation absorption spectroscopy were introduced, and the influence of modulation amplitude on gas temperature measurement was analyzed. A pair of oxygen absorption lines, 13163.78 cm-1 and 13164.18 cm-1, were optimally selected. Oxygen temperature and concentration were measured simultaneously with a high-temperature experimental setup. By analysis of second-harmonic signals, the collisional width and the temperature index of the spectral line 13164.18 cm-1 in the temperature range of 823～1323 K were acquired. Experimental results show that the linear error and maximum fluctuation of temperature measurement are 0.65% and ±15 K, respectively within the temperature range of 823～1323 K.