The transmittance of optical glass is measured using double beam spectral photometers from the company Perkin Elmer with special modifications. The standard setup enables to measure within a wavelength region from 250 nm up to 2500 nm. The measurement accuracy over the complete spectrum is about ±0.5%.
Visible light reflectance, front: the fraction of visible light reflected by the front side of a glass. Visible light reflectance, back: the fraction of visible light reflected by the back side of a glass. Solar energy transmittance: the fraction of solar energy transmitted through a glass.
The transmitted beam has the intensity I=Ii(1-r). These formulas give the following relation: The beam reflected at the exit surface returns to the entrance surface and is divided into a transmitted and a reflected part. With multiple reflections taken into account, the transmittance of the glass plate is:
Emissivity, back: the radiative heat exchange ability of the back side of a glass. Spectral transmittance: the fraction of radiation of a specific wavelength transmitted through a glass. Spectral reflectance, front: the fraction of radiation of a specific wavelength reflected by the front side of a glass.
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