摘要
基于激光吸收光谱技术和代数迭代算法,在非规则光线分布条件下,实现温度场二维重建。通过计算重建区域所有网格穿过光线数目的权重因子,得到优化的非规则光线分布方式,提高了温度场重建精度。数值仿真结果表明,采用优化的非规则光线分布温度场重建结果相对原始模型偏差在15%以内,优于未优化光线分布得到的结果;随着发射数目的增加,投影光线数目增多,不同离散网格数目下,重建质量均提高;在相同光线数目条件下,非规则光线分布重建结果优于平行投影重建结果。实验中采用时分复用技术,在1kHz扫描频率下分别扫描H2O的两条吸收谱线7205.25cm-1和7416.05cm-1,通过实验对比优化与非优化光线分布和多发射端重建结果,数值模拟结果与实验结果相一致,验证了光线分布优化方法的正确性。
Based on the laser absorption spectroscopy technique and algebraic tomography reconstruction, two- dimensional temperature distribution is reconstructed by using an irregular beam array. The grid weight factor which represents the number of lines across the grid is put forward and used to evaluate the distribution of the line. An improvement of reconstruction is obtained by optimal line distribution. The reconstructed quality with error of less than 15% compares with the non-optimal beam and parallel beam distribution reconstructed results. The reconstructed quality increases with number of emitters increasing. Time division multiplexing technology is adopted to scan two H2O absorption transitions （7205.25 cm 1 and 7416.05 cm 1） simultaneously at 1 kHz repetition rate. Additionally, the numerical results agree well with the experimental results.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第4期267-275,共9页
Acta Optica Sinica
基金
国家自然科学基金(90916015
91116010)资助课题
关键词
光谱学
可调谐半导体激光器吸收光谱
代数迭代算法
温度场二维重建
光线分布优化
spectroscopy
tunable diode laser absorption spectroscopy
algebraic tomography reconstruction
two- dimensional temperature reconstruction
optimization of beam distribution
