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为了研究激光点火过程中的化学反应历程,采用光谱分析方法分析研究了1064nm脉冲激光作用下石墨/硝酸钾烟火药剂的激光烧蚀发射光谱。测试分析表明激光作用过程中烧蚀的光谱具有线状光谱的特性,波长主要分布在300～600nm之间。光谱谱线揭示了烧蚀解离的谱线组成主要有N、O、C、K的原子光谱和离子光谱,在能量密度为46.7J/cm2的激光作用下,NⅡ385.61nm谱线最强,OⅡ441.70nm谱线最弱。烧蚀产物在气相中发生燃烧反应。
In order to study the chemical reaction process during laser ignition, the laser ablation emission spectra of graphite / potassium nitrate pyrotechnics under 1064 nm pulsed laser were analyzed by spectroscopic analysis. The test results show that the ablated spectra have a linear spectral characteristic during the laser process, and the wavelengths are mainly distributed between 300 and 600 nm. Spectral lines reveal that the composition of the ablative dissociation lines is mainly atomic and ion spectra of N, O, C and K. Under the laser energy of 46.7 J / cm 2, N Ⅱ 385.61 nm has the strongest spectral line, OII441.70nm the weakest line. Ablation products undergo a combustion reaction in the gas phase.