MattBurditt1
Зарегистрирован: 19.12.2019
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 Добавлено: Чт Дек 10, 2020 22:08 Заголовок сообщения: Gloss meter| Gloss measurement |
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Gloss is a surface property of an object that involves specular reflection. It is a physical quantity that evaluates the ability of a material's surface to reflect light under a set of geometrically prescribed conditions. Specular reflection is the reflection that occurs when light is projected onto a smooth, uniform surface. Glossiness follows the law of reflection, which states that when light is reflected from a surface, the angle of incidence is equal to the angle of reflection. When light hits a smooth surface, such as a mirror, a car or water surface, specular reflections occur. This reflection makes the object look shiny. We usually use the GU to represent the surface gloss of the object, which is the abbreviation of the English word -gloss unit.
Gloss meter (also known as gloss tester) is an instrument used to measure the specular reflection (gloss) of the object surface. Gloss is determined by projecting a light beam onto a surface at a fixed angle and measuring the amount of reflected light at equal but opposite angles.
The gloss meter uses the principle of light reflection to measure the gloss of the sample. That is: at the specified angle of incidence and the specified beam. The sample is irradiated under the conditions of 5% to obtain a beam of light in the direction of the specular reflection angle. Gloss meter consists of light source, lens, receiver and display interface,etc. Its measurement principle is divided into two types of parallel optical path (see the figure below) and convergent optical path.
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