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Lighting Design Glossary

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Transmittance
Transmissivity
Atmoshperic Transmissitivity
Transmission Coefficient

(Transmission factor is an old and deprecated term for transmittance.)

(Terms of radiometry/photometry)

Transmittance is the ratio of the total radiant or luminous flux transmitted by a transparent object to the incident flux, usually given for normal incidence.

Transmissivity
Atmospheric Transmissivity
Transmission coefficient

The ratio of the directly transmitted light after passing through one unit of a participating medium (atmosphere, dust, fog) to the amount of light that would have passed the same distance through a vacuum. It is the amount of light that remains after the absorption coefficient and the scattering coefficient (together the extinction coefficient) are accounted for.

In the Radiance software, those units are used in the specification of several material types:

 

References:
   absorption coefficient
extincton coefficient
luminous flux
Radiance software
radiant flux
reflectance
scattering coefficient
 
 
English    German
transmittance    Der Transmissionsgrad
transmissivity
atmospheric transmissivity
transmission coefficient
   Der Transmissionskoeffizient
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