利用基于可调谐半导体激光器的免标定波长调制光谱技术，通过迭代求解实现了温度和组分浓度的测量。通过测量7185.60 cm-1和7454.45 cm-1两条H2O吸收谱线的激光调制参数，得到了实验和仿真所需的参数。采用频分复用技术，对温度分布在600 K~1000 K范围内的气体温度场进行了温度和组分浓度的测量验证。结果表明，基于免标定波长调制光谱技术测得的气体温度和组分浓度与预测值基本符合，与热电偶测得的温度和直接吸收光谱方法测得的组分浓度的最大相对偏差分别在4%和5%以内。

The gas temperature and component concentration can be measured according to the iteration using the calibration-free wavelength-modulation spectroscopy based on the tunable semiconductor laser. The parameters required in the experiment and simulation can be obtained after measuring the laser modulation parameters of two H2O absorption lines (7185.60 cm-1 and 7454.45 cm-1). Frequency division multiplexing technology is adopted to measure gas temperature and component concentration of the gas temperature field in the temperature range of 600 K~1000 K. Experimental results show that the measured gas temperature and component concentration using the calibration-free wavelength-modulation spectroscopy are consistent with the predicted values. Compared with the temperature measured by thermocouple and the component concentration measured by direct absorption spectrum method, the most relative errors are within 4% and 5%.