CT-TDLAS测量燃烧火焰二维温度分布

结合可调谐半导体激光吸收光谱技术与计算机断层扫描技术,通过获得与实验值最适应的拟合光谱,重构本生灯燃烧火焰二维温度分布.以零均值归一化互相关和误差平方和作为指标,分析了32路测量组件的二维重构精度.结果表明,零均值归一化互相关达到0.994,误差平方和达到0.00086.采用32路测量系统实现了本生灯火焰二维温度的测量,并与热电偶测量结果进行对比.结果表明,两者之间的温度分布趋势相同,可调谐半导体激光吸收光谱测量具有更高的精度和分辨率,验证了可调谐半导体激光吸收光谱技术结合计算机断层扫描技术在测量二维火焰温度分布的可行性与精确性.

Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology and Computed Tomography (CT) technology were combined to reconstruct two-dimensional temperature distribution of bunsen burner flame through getting the most fitting spectrum. Zeromean Normalization Cross Correlation (ZNCC) value and Sum of Squared Difference (SSD) value were used as target to analyze accuracy of 32-path reconstruct temperature distribution. And ZNCC value comes to 0.994, SSD value comes to 0.00086.32-path CT-TDLAS system was designed and applied to measure the two-dimensional temperature distribution of Bunsen burner flame, and compared with the results of thermocouple. The results show that the temperature distribution trends between thermocouple and TDLAS are same while CT-TDLAS has higher precision and resolution. The feasibility and accuracy of reconstruction using tunable diode laser absorption spectroscopy technology and computed tomography technology is demonstrated.