IEVref:845-11-22ID:
Language:enStatus: Obsolete
Term: Koschmieder's law
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Definition: law relating the apparent contrast Cd of an object against a sky background, at a given distance of observation d, to the inherent contrast C0 and to the atmospheric transmissivity T, which is assumed to be uniform

Cd = C0 · Td/do

where do is the length specified for the definition of T

NOTE 1 – The formula is sometimes written

Cd = C0 · Td

d being the numerical value of d measured with do as "unit".

NOTE 2 – Taking into account the relationship given in 845-11-20 between T and the meteorological optical range ν, this law can also be written as

Cd = C0 • 0,05d/ν

NOTE 3 – The contrast is taken to be the ratio of the difference between the luminance of the object and the luminance of the background to the luminance of the background.


Publication date:1987
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