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Uv sterilizing lamp structure

The ULTRAVIOLET germicidal lamp (UV lamp) is actually a type of low-pressure mercury lamp that, like ordinary fluorescent lamps, USES low-pressure mercury vapor (& LT;

10-2Pa) emits ultraviolet light when excited.

What differ is fluorescent lamp tube USES is common glass, 254mm ultraviolet ray cannot be shown, can be absorbed by fluorescent powder of lamp tube wall only after exciting give visible light.

In proportion, it gives off the different colors of light that we normally see.

The lamp tube of general sterilization lamp USES quartz glass to make, because quartz glass has very high transmittance to each band of ultraviolet ray, reach 80%-90%, it is the best material that makes sterilization lamp.

Sterilization lamp has hot cathode low pressure mercury vapor discharge lamp, cold cathode low pressure mercury vapor discharge lamp and other structures, can be divided into a variety of types according to the appearance and power.

Quartz glass and common glass have very big difference on performance, basically be coefficient of thermal expansion is different, cannot seal aluminous cap lamp holder commonly, so the lamp holder of sterilization lamp material USES bakelwood, plastic or ceramic more.

The tube of a ultraviolet sterilizing lamp

Depending on cost and use, uv penetration is also useful & LT;

50% high borax glass tube instead of quartz glass.

High boron glass production process and energy-saving lamps, so the cost is very low, but it is far from the performance of quartz sterilization lamp, its sterilization effect has a considerable difference.

The ultraviolet intensity of high boron tubes is easily attenuated, and after a few hundred hours of lighting, the ultraviolet intensity drops to 50 to 70 percent of its initial level.

However, after 2000-3000 hours of burning, the ultraviolet intensity of quartz lamp only decreased to 80%-70% of the initial intensity, and the degree of light decay was far less than that of high boron lamp.

There is also a common glass with higher uv penetration, much higher than boron glass and lower than quartz glass.

But light decay is larger than quartz sterilization lamps and does not produce ozone.

One of Philip's sterilized lamps USES this kind of glass for its tubes.