Gloss meter is an instrument to measure the gloss of the surface of an object, different gloss meters have different measurement ranges, among which the two common measurement ranges are 20 degrees and 60 degrees. Although they are both used to measure gloss, there are some distinct differences between them.
The measurement angle of the 20-degree gloss meter and the 60-degree gloss meter is different. Glossiness refers to the ability of light rays reflected from the surface of an object, and measurement angle refers to the angle between the incident rays and the normal of the object's surface. A 20-degree gloss meter measures an angle of 20 degrees, while a 60-degree gloss meter measures an angle of 60 degrees. This means that they can get different results when measuring objects with different gloss levels.
The range of applications for 20-degree gloss meters and 60-degree gloss meters is also different. Since the measuring angle of the 20-degree gloss meter is small, it is usually used to measure high-gloss objects such as metal, glass, etc. The 60-degree gloss meter is usually used to measure low-gloss objects, such as paper, plastic, etc., due to the large measurement angle.
The measuring principle of the 20-degree gloss meter and the 60-degree gloss meter is also different. A 20-degree gloss meter usually uses the specular reflection principle, while a 60-degree gloss meter usually uses the diffuse reflection principle. The principle of specular reflection is that light rays are reflected back at the same angle, whereas the principle of diffuse reflection is that light rays are reflected back at different angles. Due to the difference between the two principles, the results they get when measuring the gloss of the surface of an object may also vary.
Although 20-degree gloss meter and 60-degree gloss meter are both instruments used to measure the gloss of the surface of an object, there are obvious differences between them. In practical applications, we should choose the right instrument according to the specific measurement needs to achieve the best measurement effect.
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