可调谐激光吸收光谱一次谐波法测量CO_2温度

Temperature Measurement of CO_2 by Use of First Harmonic Based on Tunable Diode Laser Absorption Spectroscopy

研究基于可调谐二极管激光吸收光谱技术的温度测量方法。选取6241．402828cm、6242．672190cm。处的2条二氧化碳谱线进行分析，应用一次谐波幅值信号完成CO2气体温度的测量。实验结果表明：在200～1000K范围内，温度测量的准确性在±3．2％以内。该温度测量方法仅需检测一次谐波信号，系统结构简单，并可消除光强波动对温度测量产生的影响。

This paper researched tunable diode laser absorption spectroscopy temperature measuring method. The temperature measurement scheme using tunable diode laser absorption spectroscopy and first harmonic signal was proposed, and two carbon di- oxide lines of 6 241. 402 828 cm I and 6 242. 672 190 cm-1 were analyzed. The temperature measurement accuracy was within ±3.2% at 200 to 1000 K. This temperature measurement scheme has simple structure for it only needs to detect first harmonic sig- nal, and this scheme can eliminates the influence of light intensity fluctuation on the gas temperature measurement.