The principle of reflective materials

 

The reflective material is the reflection principle of microprism. We all know that the reflection of light includes diffuse reflection and specular reflection. Why can the retro-reflective material return the light in the original way? Actually, this is mainly due to the high refractive index glass beads contained in it. When a beam of light is within a certain range When irradiating the front surface of the beads at any angle, the light will be concentrated on the reflective layer behind the beads due to the high refraction effect of the beads, and the reflective layer will reflect the light back in parallel along the direction of the incident light. It constitutes retroreflection. When many glasses When the beads are reflected together, the front light phenomenon will appear.

 

Experiments show that when the refractive index of the glass beads is close to 1.9, the incident light can be well concentrated on the rear surface of the glass beads. At this time, the retroreflective effect is the best. When the refractive index is less than or greater than 1.9, the incident light The lines are gathered on the outside and inside of the glass microspheres, at this time, the retroreflective effect will be reduced. In actual use, because of the influence of objective conditions, the refractive index of glass microspheres is generally between 1.9-2.1, and its diameter Generally less than 0.8 mm. If you add a reflective layer behind the glass beads, the retro-reflective effect will be better. How is such a magical glass beads produced? The production process is like this: It melts into molten glass at a very high temperature. The molten glass passes through a special nozzle to form many misty droplets. These droplets automatically form a regular spherical shape under the effect of the surface tension. After cooling, they undergo certain treatments to obtain Useful glass beads.

 

Many retro-reflective materials can be made with glass beads, such as luminous cloth, reflective paint, reflective oil, and the principle of reflective materials. The reflective material manufacturers tell us that these materials are widely used in public security, transportation, fire fighting, railways, coal mines, etc. And so on, they can be seen in labor protection products and civilian products.