There are many ultraviolet lamps in restaurants, which can really sterilize. Ultraviolet germicidal lamp, but it should be noted that it is best to turn on the ultraviolet germicidal lamp for disinfection when employees leave work, and be sure to open the window for ventilation after disinfection. Ultraviolet sterilization is a purely physical disinfection method, which has the advantages of simplicity, convenience, broad spectrum, high efficiency, no secondary pollution, easy management and automation. With the introduction of various newly designed ultraviolet tubes, the application scope of ultraviolet sterilization is also expanding.
ultraviolet rays. It has strong penetrating power and can penetrate most transparent glass and plastics. More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and clouds and reach the surface of the earth. UVA can directly reach the dermis of the skin, destroy elastic fibers and collagen fibers, and tan our skin. UVA ultraviolet with 361nm wavelength conforms to the phototaxis response curve of insects, and can be used to make insect-trapping lamps. UVA ultraviolet with the wavelength of 311-421nm can penetrate through the specially colored glass tube that completely cuts off visible light, and only radiates near ultraviolet light centered at 365nm, which can be used for ore identification, stage decoration, banknote inspection and other places.
Most of the UVB contained in sunlight is absorbed by the ozone layer, and less than 2% can reach the earth's surface, especially in summer and afternoon. UVB ultraviolet rays have erythema effect on human body, which can promote mineral metabolism and the formation of vitamin D in the body, but long-term or excessive irradiation will make the skin tan and cause redness and peeling. Ultraviolet health lamps and plant growth lamps are made of special purple-transparent glass (which does not transmit light below 254nm) and fluorescent powder with a peak value around 311nm.
cannot penetrate most transparent glass and plastic. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer. Short-wave ultraviolet rays do great harm to human body. Short-time irradiation can burn the skin, and long-term or high-intensity irradiation can also cause skin cancer. The ultraviolet germicidal lamp emits UVC short-wave ultraviolet rays.