There are three types of UV lamp wavelengths. Different wavelengths can develop different performances and are used in different environments and industries. In the different industry descriptions based on the wavelength of the UV lamp, I made a preliminary introduction to this. Today, we will explain the application of the long wave and short wave UV light of the UV lamp in the detection of sapphire material purity.

　　In most cases, UV lamps are used together with UV curing machines. They have good applications in inks and coatings. This is well known to everyone, but for the purity of sapphire materials, we may Not quite sure yet. So let's first explain what sapphire material is and the role of sapphire.

　　Sapphire crystal is a combination of three oxygen atoms and two aluminum atoms in a covalent bond type. Its crystal structure is a hexagonal lattice structure. As far as color is concerned, pure aluminum oxide crystals are transparent and colorless, due to different colors. The color-developing element ions penetrate into the growing sapphire, thus giving the sapphire a different color. Sapphire crystals are very stable in chemical properties. They are generally insoluble in water and free from corrosion by acids and alkalis. Only at higher temperatures (300 ° C) can they be attacked by hydrofluoric acid, phosphoric acid and molten potassium hydroxide.

　　Due to these excellent characteristics of artificial sapphire crystal, it has been widely used in many fields. Aerospace, windows of aircraft and spacecraft, fairings of rockets and aircraft. Automotive industry, protective covers for headlights and brake lights. Economical lighting equipment, operating table shadowless lamps, home lighting, highlight LEDs, optical components (windows, lenses, etc.). Medicine, optical instruments, communication equipment, mobile communications, chemical industry, test tubes, crucibles, catheters, watch manufacturing, etc., such a wide range of sapphire crystals are extremely important to people's lives.

　　Hundreds of companies currently manufacture sapphire in China. The purity of sapphire directly affects the quality of reprocessed products, so whether it is a sapphire manufacturer or a processing company, it is very important to check the purity of sapphire. Spectral analysis of sapphire purity is a highly accurate method, but the detection is cumbersome and not suitable for large-scale screening of production lines. UV lamp irradiation method can quickly screen the purity of sapphire crystals. Currently, there are two models on the market:

　　1.LEC-180L short wave UV lamp

　　2.LEA-180L long wave UV lamp

　　Its working principle is to determine its purity according to the color change of sapphire material under ultraviolet light. Sapphire crystals containing different metal impurities show different colors under ultraviolet light. Pure sapphire crystals have no color change under ultraviolet light. At present, among the artificial sapphire manufacturers, the LEA-180L long-wave UV lamp is widely used because its wide wavelength range is more suitable for the identification of the entire crystal.