Principle of Specular Gloss Measurement
Under specified light source and the receiver angle, Glossiness means: the ratio=Reflected light flux in the specular direction of the sample /Reflected light flux in the specular direction of standard glossiness plate.
In the geometric angle of 60 degrees, and the refractive index is 1.567 of the polished black glass,Define the polished black glass's glossiness as 100GU(Gloss Unit)
So glossiness measurement is comparison measure method that under the same conditions, with respect to the standard glossiness plate, to test the samples. In the same condition, means the incidence angle is certain, and the default light source is stable, with prescribed conditions beam to irradiate sample (or the standard plate) Receive the reflected light beam in a specified condition in the specular direction.
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