研究了可调谐半导体激光吸收光谱技术实现气体浓度二维分布测量的方法, 探索了重建气体浓度二维分布的模型和算法, 并采用数值模拟的方式对重建程序进行了可行性验证。 搭建了由24束激光束构成的场参数测量系统, 以甲烷/空气预混火焰中H2O为测量对象, 运用重建程序重建了火焰中H2O浓度的二维分布, 实验结果分析表明, 重建结果较真实的反应了火焰中H2O浓度的二维分布状态, 为实现优化燃烧控制提供重要数据。

The experimental method by using the tunable diode laser absorption spectroscopy combined with the model and algorithm was studied to reconstruct the two-dimensional distribution of gas concentration. The feasibility of the reconstruction program was verified by numerical simulation. A diagnostic system consisting of 24 lasers was built for the measurement of H2O in the methane/air premixed flame. The two-dimensional distribution of H2O concentration in the flame was reconstructed, showing that the reconstruction results reflect the real two-dimensional distribution of H2O concentration in the flame. This diagnostic scheme provides a promising solution for combustion control.