Introduction to the principle of measurement of gloss
First: Gloss is a physical quantity that evaluates the ability of a material surface to reflect light under a set of geometrically defined conditions, with a directional selective reflection property. The gloss we usually say refers to "mirror gloss," so gloss is sometimes called "mirror gloss." Gloss is completely different from the concept of “smoothness†or “roughness†in the machining industry, which is a continuation of small irregularities on the surface of the material.
Second: The measurement principle of gloss is shown in the figure below. The measuring head of the instrument consists of a transmitter consisting of an incandescent source and a set of lenses that produce a desired incident beam. The receptacle consists of a lens and a photosensitive element for receiving a cone beam that is reflected back from the surface of the sample.
Mirror gloss is a relative measure of mirror gloss. The reference standard is a black glass with a refractive index np=1.567, assuming that its plane is in a state of ideal polishing, the natural beam is mirror-reflected by the plane, and the gloss value at this time is defined as 100.0 gloss units. The gloss plate is further divided into high, medium and low according to the gloss value. The high gloss panel is made of black optical glass or other material. The medium gloss plate and the low gloss plate are made of glazed ceramic or black optical glass. Gloss The gloss of the sample is measured using the principle of light reflection. That is, the sample is irradiated under the conditions of the predetermined incident angle and the predetermined beam to obtain a light source in the direction of the mirror reflection angle.
Wave theory can be used to qualitatively explain many of the optical properties of materials. According to the wave theory, the ratio of the energy W of the incident light per unit area to the energy flow W of the reflected light per unit time can be derived.
When measuring gloss in the furniture, electrical appliances, automotive, and architectural decoration industries, you can come to Meihua to purchase the three-angle gloss meter MHY-15204.
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