Glossometer is a kind of instrument for measuring the gloss of solid surface by using the principle of reflection. It is used for measuring the gloss of ceramic, paint, ink, plastic, marble, aluminum, hardware and other materials.
*: glossiness is a physical quantity that evaluates the ability of a material surface to reflect light under a set of geometrical conditions, with reflective properties of direction selection.We usually say the gloss refers to the “mirror to the gloss”, so glossometer is sometimes called “mirror to the glossometer”.Gloss is quite different from the concept of “finish” or “roughness” in the machining industry, which is the continuation of the small irregularities on the surface of a material.
Second: the measurement principle of the gloss meter is shown in the figure below.The measuring head of the instrument is composed of an emitter and a receiver. The emitter is composed of an incandescent light source and a set of lenses. It produces a certain required incident beam.The receiver consists of a lens and a photosensitive element, which is used to receive a cone beam reflected from the sample surface.Measuring principle
Measuring principle
Mirror gloss is a relative measure of mirror gloss.The reference standard is black glass with refractive index np=1.567. It is assumed that its plane reflects the natural beam mirror-wise from the plane under the condition of ideal polishing, and the gloss value at this time is defined as 100.0 gloss units.Glossiness board is divided by glossiness value again high, medium, low 3 kinds.The high gloss plate is made of black optical glass or other materials.Medium and low gloss panels are made of glazed ceramic or black optical glass frosted.The glossiness of the sample is measured by using the principle of light reflection.That is, under the condition of specified incident Angle and specified beam, the sample is irradiated to obtain the light source in the direction of mirror reflection Angle.
Many optical properties of materials can be qualitatively explained by wave theory.According to the wave theory, the ratio of the energy W of incident light passing through unit area per unit time to the energy flow W of reflected light can be derived.Measuring principle
Measuring principle
W1 sin2(i-r) tg2(i-r)
– = [– — — — — – + — — — — — -]
W02 sin2(I+r) tg2(i-r)
Where, the included Angle (incident Angle) between the incident ray and the normal (I),
R one Angle of refraction.
Glossiness is the property of the surface of an object, which is reflected in the appearance of different bright spots on the surface or the image of an object that overlaps on the surface.Glossiness is the ability of the surface of an object to reflect light when it is irradiated by light, which is usually expressed by the reflectivity of the sample in the mirror (positive reflection) direction relative to the standard surface multiplied by 100, that is, G=100R/R.
In the formula, R– the reflectivity of the sample surface, /R.— the reflectivity of the standard plate.With polished black glass as the reference plate, the refractive index of sodium D ray is 1.568, and the mirror gloss of each geometrically optical condition is calibrated to 105 gloss units.
Used for measuring the surface gloss of flat products such as plastics, ceramics, ink, stone, paper and metal, medical etc.