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采用一套精密的光电系统对汽油机着火和燃烧过程中的火焰光谱进行了测量和分析，试验结果表明，着火过程中存在台不同燃烧中间产物的大量光谱，着火后ＣＨ及Ｃ２自由基的光强迅速增加，而其它自由基的光强减少了，ＣＨ自由基光强的变化较之缸内压力变化能够给出更准确的关于着火延迟及燃烧终点的信息，过量空气系数和温度的变化已经通过光学诊断技术测量过了，分别测量４３１ｎｍ和５１７ｎｍ，５０２ｕｍ和７９７ｕｍ的发光强度可以估算过量空气系数及火焰温度，过量空气系数的ＰＤＦ图（概率密度函数图）已被证明与混合气形成与燃烧有着紧密的关系。
A set of sophisticated optoelectronic systems was used to measure and analyze the flame spectrum during the ignition and combustion of gasoline engines. The experimental results show that there are a large number of spectra of different combustion intermediate products during ignition, and the light intensity of CH and C2 radicals after ignition Rapidly increases while the light intensity of other free radicals diminishes. Changes in the light intensity of CH radicals as compared to changes in in-cylinder pressure can give more accurate information about the ignition delay and the end of burning, the change in excess air ratio and temperature has been passed Optical diagnostic techniques were used to measure the excess air factor and the flame temperature by measuring the emission intensities at 431 nm and 517 nm, 502 um and 797 um, respectively. A PDF plot of the excess air coefficient (Probability Density Function plot) has been shown to be associated with the formation and combustion of the mixed gas Close relationship.