Abstract: In order to improve the application of wavelength modulation spectroscopy，a method of measuring gas pressure and concentration using the H2O absorption transitions (7454.45cm-1) near 1.4μm is studied. The measurement of wavelength modulation spectroscopy based on the 4fpeak/2fpeak and 2f/1f signals of 7454.45cm-1 is analysed in detail. Combining simulation and experiment，the gas pressure and concentration are measured simultaneously in the static cell according to the iterative algorithm. Experimental results show that the measured gas pressure and concentration are consistent with the predicted values from 500K to 1000K. Compared with predicted values，the most relative errors are 5% and 4%，repestivery.

Key words: Wavelength modulation spectroscopy；Iterative algorithm；Pressure measurement；Concentration measurement

摘要： 为了完善基于波长调制光谱的应用研究，利用1.4μm附近的H2O吸收谱线(7454.45cm-1)，研究了一种基于波长调制光谱测量气体压强和组分浓度的方法。基于谱线7454.45cm-1的4fpeak/2fpeak和2f/1f信号，详细分析了波长调制光谱方法测量的详细过程。结合仿真和实验，通过迭代算法在样品池内实现了气体压强和组分浓度的同时测量。实验结果表明:在500 ~ 1000K的温度范围内，压强和组分浓度的测量值与预测值基本符合，与预测值的最大误差分别在5%和4%以内。

关键词: 波长调制光谱；迭代算法；压强测量；组分浓度测量