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%.