The thermometry of tunable diode laser absorption spectroscopy(TDLAS) wavelength modulation spectroscopy (WMS) technique was briefly introduced. Two adjacent water lines at 1 397. 75 nm and at 1 397. 87 nm were selected, and the online measurement system of WMS technique for CH4 /air premix flame temperature was established. A 250 Hz real-time readout rate was achieved by using a multifunctional data acquisition card for signal processing and diode laser control. The measurements were performed on the calibration burner, and the A type standard uncertainty of temperature was less than 53 K base on the analysis of the measurement results.%介绍了可调谐二极管激光吸收光谱(TDLAS)波长调制技术的测温原理.通过选择水在1 397.75 nm和1 397.87 nm处两条邻近的吸收线,运用多功能数据采集卡对二极管激光器进行控制和信号采集,实现了TDLAS波长调制技术对标定燃烧炉甲烷/空气预混火焰温度的实时在线测量,测量重复频率为250Hz.分析了温度测量数据抖动的原因,结果表明燃烧过程中火焰本身温度的抖动是测量结果波动的主要原因,测量系统的A类标准不确定度小于53 K.
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