基于可调谐二极管激光吸收光谱技术的水汽测温研究

The Research on Temperature Measurement by H_2O Based on the Tunable Diode Laser Absorption Spectroscopy

采用可调谐二极管激光吸收光谱法（TDLAS）的波长调制技术，实现气体温度的测量。通过波长调制的原理测量温度，考虑到H2O在大气中、工业生产中普遍存在的优势，选择H2O在1397nm附近谱线对，分别测量了谱线对在400℃、600℃、800℃、1000℃、1100℃5个温度测量点的二次谐波信号，通过分析二次谐波信号的峰一峰比值与温度的关系，获得温度测量值。实验结果表明，在400～1100℃温度范围内，系统测量的温度误差最大值不超过0．113％。

The gas temperature measurement was achieved by using wavelength-modulation spectroscopy technique based on the tunable diode laser absorption spectroscopy （TDLAS）. Temperature measurement principle of wavelengthmodulation spectroscopy method was discussed, considering the advantages of H2O absorption lines for temperature measurement, a pair of H2O absorption lines near 1397nm were selected, which the second harmonic signal was measured on five temperature data of 400℃, 600℃, 800℃, 1000℃ and 1100℃. According to analysis the relationship between the second harmonic signal peak - peak ratio and temperature, temperature measurements were obtained. Experimental results show that the max error does not exceed 0.113% within the temperature range of 400-1000℃.