Ultraviolet has three different bands, UVA/UVB/UVC, and the main applications are different.
UVA band: wavelength 320-420nm, also known as long-wave dark spot effect ultraviolet. It has strong penetrating power and can penetrate most transparent glass and plastics. More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and cloud layer to reach the earth's surface. UVA can reach the dermis layer of the skin, destroy elastic fibers and collagen fibers, and tan our skin. The UVA ultraviolet rays with wavelength of 360nm are in line with the phototaxis response curve of insects, and can be used to make trap lights. UVA ultraviolet rays with wavelengths of 300-420nm can pass through special colored glass lamps that completely cut off visible light, and only radiate ultraviolet light centered at 365nm. Shenzhen Yinghong is used to make non-destructive flaw detection lamps, fluorescent leak detection lamps, degreasing cleaning lamps, Criminal police forensic inspection lights, laboratory inspection lights, etc. In addition, this ultraviolet light can also be used for ore identification, anti-counterfeiting verification, banknote inspection, curing, security inspection...
UVB band: wavelength 275 ~ 320nm, also known as medium wave erythema effect ultraviolet. Medium penetrating power, its shorter wavelength part will be absorbed by transparent glass, most of the medium-wave ultraviolet rays contained in sunlight are absorbed by the ozone layer, and only less than 2% can reach the earth's surface, which is especially strong in summer and afternoon. UVB ultraviolet rays have an erythematous effect on the human body, which can promote the metabolism of minerals and the formation of vitamin D in the body, but long-term or excessive exposure will tan the skin and cause redness and peeling. Ultraviolet health lamps and plant growth lamps are made of special transparent violet glass (which does not transmit light below 254nm) and phosphors with a peak value around 300nm.
The UVA ultraviolet light is mainly used for the aging and yellowing test of the surface of the object and to promote the growth of animals and plants. Medium-pressure mercury lamps or low-pressure mercury lamps with special phosphors can be used as light sources. The narrow-spectrum UVB can also be used in the treatment of human skin diseases, such as vitiligo, psoriasis and so on.
UVC band: wavelength 200 ~ 275nm, also known as short-wave sterilization ultraviolet. It has the weakest penetrating ability and cannot penetrate most transparent glass and plastics. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer. Short-wave ultraviolet rays are very harmful to the human body. Short-term exposure can burn the skin. Long-term or high-intensity exposure can also cause skin cancer.
UVC ultraviolet rays have strong sterilization ability and can be used as ultraviolet germicidal lamps. The principle is that C-wave ultraviolet rays can cut off the DNA links of microorganisms such as bacteria and viruses, causing them to lose their ability to reproduce and play a bactericidal effect. Its efficiency peaks at 264nm, which is very close to the spectral peak emitted by low-pressure UV lamps. Therefore, low-pressure mercury lamps are often used in places where surfaces need to be disinfected.
Ultraviolet rays in the UVC band can also act on the surface of the photocatalyst material in combination with the catalyst material to decompose the organic matter of macromolecules into water and carbon dioxide. This kind of efficiency is now being increasingly applied to light cleaning in the microelectronics industry, organic waste gas degradation in the environmental protection industry, and indoor air purification in the home appliance industry. And it has been proved to be an efficient, environmentally friendly, energy-saving and no secondary pollution treatment method.
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