分子的消光系数等于入射光和透射光强度对数的比。
The molecular extinction coefficient is equal to the ratio of the log of the intensity of the incident and emergent light .
进行了光纤甲烷测量系统的实验研究，包括LED光谱特性，透射光强度与甲烷气体浓度的关系以及标定结果等。
Experimental research has been completed including LED spectrum characteristics, relationship between transmission light intensity and CH4 density, result analysis and calibration.
在测量范围内可以产生单色辐射光学系统的分光光度计也可以使用。通常光谱是透光度（透射光强度与入射光强度之商）的函数。
Normally the spectrum is given as a function of transmittance, the quotient of the intensity of the transmitted radiation and the incident radiation.
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