Some friends who are more concerned about the glass industry may often hear people mention optical glass. We often come into contact with all kinds of glass materials, but because many people do not have a deep enough understanding of the glass industry, there are a variety of problems around it. In order to help you further understand the classification method of optical glass materials, understand how to calculate the weight of glass tubes, and solve your doubts, we compiled this article, hoping to be helpful.
1. Classification method of optical glass materials
According to different requirements, optical glass can be divided into three categories:
① Colorless optical glass - it is almost completely transparent in a wide range of visible and near-infrared bands, and is a very large amount of optical glass. There are hundreds of grades according to the different refractive index and dispersion, which can be divided into two varieties, namely crown optical glass (represented by K) and Flint optical glass (represented by F). Crown glass is borosilicate glass, which becomes flint glass when alumina is added. The main difference between the two is that the refractive index and dispersion of flint glass are very large, so spectral components are made with it.
(2) Radiation resistant optical glass - has the properties of colorless optical glass, and can basically not change the performance under radioactive irradiation. For optical instruments exposed to gamma irradiation, the variety and grade are the same as colorless optical glass. Its chemical composition is based on colorless optical glass, adding a small amount of cerium dioxide to clean up the color center formed by high-energy radiation in the glass, so that the light absorption of this glass changes little after irradiation.
Colored optical glass - has specific absorption or transmission properties for certain wavelengths of light. Also known as filter glass, there are more than 100 varieties. Color filters can select absorption for some colors, and neutral filters absorb the same amount of light at all wavelengths, but reduce the beam intensity without changing its color. Interference filters are based on the interference principle of light, the unwanted color will be reflected off rather than absorbed