可调谐半导体激光吸收光谱测温谱线选择

可调谐半导体激光吸收光谱(Tunable Diode Laser Absorption Spectroscopy,TDLAS)作为非接触光学测量手段,在燃烧诊断、推进系统研发中应用广泛,而吸收谱线对的选择是采用TDLAS技术进行燃气温度测量的基础和关键一步。在扫描波长-直接吸收法测量H_2O温度的实验中,首先系统地研究了谱线选择的基本原则和实现步骤,对选择原则中各指标的量化进行了重点分析;然后对中心频率在7000～7500 cm~(-1)范围内的水分子吸收谱线进行研究和筛选;最后结合数值模拟进行分析,选择了7022. 7091,7444. 3707 cm~(-1)和7185. 5962,7444. 3707cm~(-1)两对谱线,为TDLAS温度测量系统设计提供依据。

Tunable Diode Laser Absorption Spectroscopy Temperature Measurement Line Selection

Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a non-contact optical measurement method which is widely used in combustion diagnosis and propulsion system development. The selection of the absorption line pairs is the basis and key of gas temperature measurement using TDLAS. In the experiment of scanning wavelength-direct absorption method for measuring the temperature of H2O, the basic principles and implementation steps of spectral line selection are systematically studied, and the quantification of each index in the selection principle is analyzed. Then the absorption lines of water molecules in the range of 7000~7500cm-1 were studied and screened. Finally, the numerical simulations were used to analyze and two line pairs were selected: 7022.7091, 7444.3707 cm-1 and 7185.5962, 7444.3707 cm-1, which provided the basis for the design of TDALS temperature measurement system.