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基于可调谐半导体激光吸收光谱技术(TDLAS),设计了气体浓度二维分布重建系统。将单路可调谐激光分为24路,交叉穿过目标区域,得到24组直接吸收信号(DA),并采用代数迭代法(ART)计算得到目标区域气体浓度二维分布。搭建了二维气体浓度分布测量试验台,利用中心波长在1.653μm的DFB激光器作为光源,选取HITRAN数据库CH4的2v3带R(3)线作为计算谱线进行数值模拟和试验验证,并对重建结果进行了误差分析。结果表明重建系统能很好的实现气体二维浓度分布重建测量。
Based on tunable semiconductor laser absorption spectroscopy (TDLAS), a two-dimensional gas concentration distribution system was designed. The tunable single laser beam is divided into 24 channels and crosses the target area to obtain 24 groups of direct absorption signals (DA). The algebraic iterative method (ART) is used to calculate the two-dimensional gas concentration distribution in the target area. A two-dimensional gas concentration distribution measurement test stand was set up. The DFB laser with the center wavelength of 1.653μm was used as the light source, and the 2v3 band R (3) line of HITRAN database CH4 was selected as the calculated spectrum for numerical simulation and experimental verification. Error analysis was performed. The results show that the reconstructed system can well measure the reconstructed gas two-dimensional concentration distribution.