Optical glass can change the direction of light propagation and change the relative spectral distribution of ultraviolet, visible or infrared light. Components made of optical glass are key elements in optical instruments.
The main difference between optical glass and ordinary glass: Optical glass has high transparency, high physical and chemical uniformity, and specific and precise optical constants. Optical glass contains most of the elements in the periodic table, but the composition and content are different.
Usually the main component of optical glass is silica, also known as quartz sand. When smelting glass, other substances must be added to improve the performance of the glass and meet the needs of system imaging. For example, the addition of Al2O3 can improve the chemical stability and mechanical strength of the glass; the addition of lead oxide and barium oxide can increase the refractive index of the glass, but the chemical stability is reduced; the addition of sodium oxide can reduce the melting temperature; in addition, other various oxides can be added as needed. thing.
Glass with silicon dioxide SiO2 as the main component belongs to silicate glass, boron trioxide B2O3 as the main component belongs to borosilicate glass, and phosphorus pentoxide P2O5 as the main component belongs to phosphate glass.
To learn more about the difference between optical glass and ordinary glass:
1. The refractive index ND is different, and the uniformity is not good. Optical glass has high transmittance and uniform transmission. And ordinary glass through uneven and low. After magnification, you can feel that the transmittance of each point of the glass is uneven, and the light is deformed. There will be serious data and outline data deviations and errors when collecting images.
2. Most of the ordinary glass is produced by the recycling and reprocessing of optical glass. After remelting, ordinary glass is formed. Such glass will be easily scratched and the bearing capacity will be greatly weakened. Flatness is not good. Optical cold working is not possible.
3. The color of the glass will be uneven, and serious color distortion will occur.