Ultraviolet (uv) what are the common sense?

by:Tepro     2020-07-01

ultraviolet (uv) is a kind of invisible to the naked eye, light 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. Ultraviolet (uv) besides according to its wavelength is divided into various wavelengths, different wavelength of ultraviolet its photochemical effect is not the same.

a: near uv

uv wavelength adjacency is called near ultraviolet visible light range, according to the definition of the wavelength range is 315 - 400 nm

2: in the ultraviolet (uv)

between near uv and deep uv ultraviolet wavelength, wave length range is 280 - 315nm。 In the range of ultraviolet radiation and health line to overlap.

3: health line

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 was discovered by the surname, therefore calls lines to Dorno or health. Human bone growth have Dorno full exposure of line, and can prevent anemia, skin can prevent anemia, tuberculosis, and hair removal, etc.

4: deep UV

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.

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 the price is far beyond the sterilization lamp, quartz glass production a few tubes of only a few yuan, but it is far less than quartz germicidal lamp on performance. In the following aspects:

- - - - - - - - - - - - - - - - - - - 1, the transmittance is different, in the same test specifications by the same ballast, quartz glass sterilization lamp uv intensity is high boron glass sterilization lamp 1. More than 5 times;

2, high boron glass lamp uv light intensity attenuation, it is easy to hundreds of hours after its light intensity of the ultraviolet light has fallen dramatically, to 50% of the initial - 70%. In the user's hands, although saw tubes or bright, but it may have no effect. And quartz glass light attenuation degree is much less than the high boron lamp, if the production process, 2000 - quartz lamp light attenuation in the light 3000 hours, the light attenuation to the initial 80% After 70%, not as long as the lights, light failure rate will be more and more small.

- - - - - - - - - - - - - - - - - - - Another feature of quartz germicidal lamp is emits ozone. Because quartz glass for shortwave 185 nm uv transmittance is high also, 185 nm uv can ionizing air to produce ozone, the ozone concentration high adverse to human body, but can use when no one occasion, ozone can sterilization, disinfection, just can make up due to ultraviolet ray propagation along a straight line only, disinfection has the defects of a corner.

from the above analysis, do the sterilization lamp with quartz glass is the best choice. At home, medical and health field, already do not recommend the use of high boron germicidal lamp, in the United States, Canada, Japan production ultraviolet ray sterilizing lamp widely using quartz glass.


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