可调谐二极管激光光谱技术测量燃烧环境下H_2O浓度的实验设计

Experimental Design of H_2O Concentration Measurement with Tunable Diode Laser Spectroscopy in Combustion Environment

水蒸气是碳氢化合物燃烧的主要产物之一,对其浓度进行测量具有重要的意义。在已有理论基础上推导选择了最佳的拟合线型函数(Voigt线型),结合HITRAN数据库选择了在实验室现有条件下理想的吸收线。理论分析了用两条相邻吸收线的线强比计算温度的可行性,在此基础上建立了一套基于可调谐二极管激光吸收光谱(TDLAS)技术的实验装置,为进一步实验打下了良好的基础。

Water vapor is one of the major products from hydrocarbon combustion. It＇s important to measure its concentration. The optimal line fitting function, Voigt function, was selected based on existing theories. Suitable absorption lines were chosen with HITRAN database. Method of temperature calculation using line strength ratio of two selected H2O transitions was analyzed, and experiment equipment was set up based on TDLAS.