The molecular extinction coefficient is equal to the ratio of the log of the intensity of the incident and emergent light .

分子的消光系数等于入射光和透射光强度对数的比。

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The intensity of forward-scattered light is measured by the forward-scattering visibility sensor, which determines the extinction coefficient of the air, then the visibility can be obtained.

前向散射能见度仪测量前向散射光强度，确定大气的消光系数，进而获得大气的能见度值。

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