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波长7.6～400毫微米的电磁波为紫外辐射,由于在太阳光谱中位于可见光紫色部分之外,故又称紫外线。自然界中,太阳是产生紫外线的主要辐射源。在生产环境中,凡是物体温度高达1200℃以上时,辐射光谱中即可出现紫外线,随着物体温度增高,紫外线的波长变短,其强度也增大。生产中接触紫外线的作业主要有电焊、气焊、切割、冶炼炉(平炉、高炉)、电炉炼钢以及应用水银石英灯、探照灯、制版强光灯、紫外线消毒等。波长短于160毫微米的紫外线可被空气完全吸收,只在真空中存在,无实际意义。
Wavelength 7.6-400 nm electromagnetic radiation as ultraviolet radiation, as in the solar spectrum in the visible part of the purple, it is also known as UV. In nature, the sun is the main source of ultraviolet radiation. In the production environment, where the temperature of an object is as high as 1200 ° C or more, ultraviolet rays can appear in the radiation spectrum, and as the temperature of the object increases, the wavelength of the ultraviolet light becomes shorter and its intensity also increases. Production operations in contact with ultraviolet light welding, gas welding, cutting, smelting furnace (open hearth, blast furnace), electric steelmaking and the application of mercury quartz lamp, searchlight, plate light, UV disinfection. UV wavelengths shorter than 160 nm can be fully absorbed by the air, only in a vacuum, meaningless.