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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—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%。
Wavelength modulation using tunable diode laser absorption spectroscopy (TDLAS) enables gas temperature measurement. The principle of wavelength modulation was used to measure the temperature. Considering the common advantages of H2O in the atmosphere and industrial production, the spectral line pair of H2O near 1397 nm was selected and the spectral line pairs were measured at 400 ℃, 600 ℃, 800 ℃, 1000 ℃ , 1100 ℃ five temperature measurement points of the second harmonic signal by analyzing the second harmonic signal peak-to-peak ratio of the relationship between the temperature to obtain temperature measurements. The experimental results show that the maximum temperature error measured by the system does not exceed 0.113% in the temperature range of 400 ~ 1100 ℃.