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کشاورزی::
عبوردهی
Color spectrophotometers do not have the limitations of colorimeters because they measure the percent reflectance or transmittance (spectral data) wave- length by wavelength across the visible spectrum.
Primary Y, known as luminous reflectance or transmittance, contains the entire lightness stimulus.
Spectrophotometers measure the spectral distribution of transmittance or reflectance of the sample.
Both transmittance and reflectance are inherent and relative properties of the objects which do not depend on either the illumination or the observer, whereas, as has been mentioned before, colour does depend on both of them.
Transmittance measurements, by means of a spectrophotometer, are the ratio between the response when the sample is in the optical pathway of the instrument and the response when the sample is not present.
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مکانیک::
ضریب انتقال
Plastic films and sheets may also be used for the purpose of glazing because they possess high transmittance to short-wavelength solar radiation.
The transmittance (τ)
The transmittance of initially unpolarised solar radiation is the average of the two components and it is expressed as
b Variation of transmittance with incidence angle
It shows that transmittance decreases as the number of glass covers
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