Ultraviolet ( UV） The basic common sense
ultraviolet ( ultravidet辐射:紫外线) Is a kind of invisible to the naked eye, light in 1802 by a German physics at home, RITTE) Discovery. Wavelength of 380 nm in the following sections called ultraviolet (uv) light, solar radiation absorbed by ozone and ultraviolet rays of the wavelength of 280 nm in the following sections are unable to reach the ground.
uv besides according to its wavelength is divided into various wavelengths, different wavelength of ultraviolet (uv) its photochemical effect is not the same. A: near ultraviolet ( 近紫外线辐射:UV - 一)
UV wavelength adjacency is called near ultraviolet visible light range, according to the definition of CIE, UV - A wavelength range is 315 - 400nm。
2: in the ultraviolet ( 中间意味着紫外线辐射:UV - B）
between near UV and deep UV ultraviolet wavelengths, according to the definition of CIE, UV - Wavelength range is 280 - B 315nm。 In the range of ultraviolet radiation and health line to overlap.
3: health line ( darno紫外线辐射)
Dorno line 290 - refers to the wavelength 320 nm range of ultraviolet ray, for health care treatment, and the most effect on the development of the light. It is discovered by Dorno surname, therefore calls lines to Dorno or health. Human bone growth have Dorno full exposure of line, and can prevent anemia, tuberculosis skin and hair removal, etc.
4: far ultraviolet ( 远lvacuum紫外线辐射:UV - C)
UV wavelength ultraviolet concurrently in a known as the far ultraviolet light, according to the definition of CIE, UV - Wavelength range is 100 - C 280nm。 C band ultraviolet lamp is commonly known as the ultraviolet germicidal lamp. Germicidal lamp is a kind of low pressure mercury lamp, it is the use of low mercury vapor pressure ( < 10 - 2 Pa) Be intensified and emit ultraviolet light, its hair spectral line mainly have two: one is 253. 7 nm wavelength; Another is 185 nm wavelength, and the two are invisible to the naked eye c-band ultraviolet light. - - - - - - Used for lighting fluorescent lamp, energy-saving lamps, also belong to the low pressure mercury lamp, rely on the low pressure mercury vapor emission ultraviolet ray, after being inspired 253 of them. 7 nm wavelength of ultraviolet irradiation on the phosphor to emit visible light, if change the composition and proportion of phosphor, it can we usually see different colors of light.
- - - - - - - - - - - - - - - - - - - Germicidal lamp don't need to be converted to visible light, 253. 7 nm wavelength can have very good sterilization effect, this is because the cells of light absorption lines there is a rule, in the 250 - 270 nm ultraviolet ray has the largest absorption, uv actually is absorbed on the cellular genetic material or DNA, it plays a allochromatic, ultraviolet photons energy absorbed by the base pairs of DNA, cause mutation genetic material, make the bacteria died or cannot reproduce, achieve the purpose of sterilization.
- - - - - - - - - - - - - - - - - - - Fluorescent lamp and energy-saving lamps use common glass, 253. 7 nm ultraviolet through not to come out, can't for sterilization lamp, quartz glass for uv transmittance is high, up to 90%, is the best material to do the sterilization lamp, but the performance of the quartz glass and common glass there's a big difference in performance ( Mainly different thermal-expansion coefficient) , seal can't use ordinary high degree of automation of the circular sealing way, which makes the germicidal lamp manufacturing technology content than ordinary energy-saving lamps.
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There is a kind of transparent glass, uv known as high boron glass, it is quartz glass for uv transmittance about 60% of its production technology and energy-saving lamps, make its cost and price is far beyond the sterilization lamp, quartz glass production a few tubes of just a few dollars, but it is far less than quartz germicidal lamp on performance.
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