Based on the infrared spectrum absorption characterization of methane gas, the long optical distance differential absorption method for methane detection is studied.
基于甲烷气体的红外光谱吸收特性，研究了长光程差分吸收式甲烷气体检测的方法。
In the general method the absorption rate is found out by solving differential equations.
在一般方法中，使用了微分方程求解吸收速率。
With the method of differential optical absorption spectroscopy(DOAS), aerosol along the light path is measured with a flashlight source.
介绍了一种基于闪烁氙灯光源、利用差分光谱吸收（DOAS）技术监测大气气溶胶的新方法。
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