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紫外线灯消毒比较方便,但若使用不当往往达不到消毒的目的。紫外线是一种低能量的电磁辐射,当微生物受到照射时,可引起细胞内成分、特别是核酸、原浆蛋白与酶的化学变化,致使微生物死亡。紫外线灯发射出的紫外线的波长在180.0～400.0毫微米之间,一般多以253.7毫微米作为杀菌紫外线波长的代表。低压汞气灯分热阴极与冷阴极两种,前者发射出的紫外线有95％为253.7毫微米波长,且强度较高。因而以消毒为目的要选用热阴极低压汞气灯。灯管玻璃质量也影响发射紫外线,以石英作原料的灯管较好。
UV lamp disinfection more convenient, but often improper use of disinfection purposes. Ultraviolet light is a kind of low-energy electromagnetic radiation. When a microorganism is irradiated, it can cause chemical changes of intracellular components, especially nucleic acids, plasma proteins and enzymes, resulting in the death of microorganisms. Ultraviolet light emitted UV wavelengths between 180.0 ~ 400.0 nm, 253.7 nm are generally more as a representative of germicidal UV wavelengths. Low-pressure mercury vapor lamp is divided into hot cathode and cold cathode two, the former UV 95% of 253.7 nm wavelength, and high intensity. Thus for the purpose of disinfection to choose hot cathode low pressure mercury vapor lamp. The quality of the glass tube also affects the emission of UV light, quartz tube as the raw material of the lamp is better.