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利用光纤传输光信号，对二级轻气炮发射后靶室内的杂质光谱进行了探测。这种杂质谱大致包含了高温废气的热辐射谱、一些杂质原子激发后产生的特征谱和分子振动带谱。杂质辐射持续的时间大约为９０ｍｓ。利用这种测试手段，还获得了塑料样品的冲击发射光谱。杂质辐射和弹丸碰靶后样品的冲击辐射在时间上是相互重叠的。由于材料在冲击作用下的不透明性，废气的热辐射基本上不会干扰对冲击材料发射光谱的探测。
Optical signals are transmitted through the optical fiber to detect the impurity spectrum of the target chamber after the secondary light gas gun launches. This impurity spectrum broadly includes the thermal emission spectrum of high-temperature exhaust gases, the characteristic spectra and molecular vibrational bands generated by some impurity atoms. Impurity radiation lasts for about 90ms. Using this test method, the impact emission spectra of plastic samples were also obtained. The impinging radiation and the impact radiation of the sample after the target hit the target overlap with each other in time. Owing to the opacity of the material under impact, the thermal radiation of the exhaust gases does not substantially interfere with the detection of the emission spectra of the impact material.