激光诱导预分离荧光法窄带及宽带测温实验研究

Study on Instantaneous Temperature Measurement in a Flame by LIPF

介绍了激光诱导预分离荧光法测温的原理及实验结果。利用可调谐KrF准分子激光器 ,在常压甲烷 空气火焰内测得了OH自由基的系列荧光谱 ;并对它们的谱线结构进行了分析 ;给出了利用窄带激光和宽带激光两种不同激励条件下测量的温度值。通过选择适当的激励线及激光能量 ,减去背景噪声等途径 ,使两种方法的测量精度均高于 3 %。

The principles and the experimental results for temperature measurements by laser induced predissociative fluorescence (LIPF) are presented. With a tunable KrF excimer laser, the fluorescence of OH radical was obtained in a methane air flame at the pressure of atmosphere and the structures of the spectrum were analyzed. The temperatures in the flame were also measured by LIPF narrow band and broad band methods. By selecting proper excited lines, subtracting background noises and choosing moderate laser energy, both the precision is less than 3%.