UV light intensity meter test the germicidal lamp irradiation intensity

The principle of the ultraviolet germicidal lamp is: the mercury atoms in the lamp tube are excited to produce the characteristic spectrum of mercury. The low-pressure mercury vapor mainly produces ultraviolet rays of 254nm and 185nm. The germicidal lamp lamp tube is made of quartz glass, so that ultraviolet rays are transmitted through the lamp tube. . The detection of the radiation intensity of the ultraviolet germicidal lamp requires the use of an UV light intensity meter.
UV light intensity meter
1. Design principle of ultraviolet germicidal lamp(1) Effective radiation dose (Heff)The effective radiation dose is the product of time and effective illuminance, however, the radiation dose is limited by the ability of the radiation to penetrate the medium. The penetration capacity depends on the size of the absorption coefficient. For solids, the surface will absorb all radiation; for water, depending on its purity, optical radiation can penetrate a few millimeters to a few microns before being absorbed by 90[%].(2) Harm caused by sterilization radiationSterilizing radiation can cause conjunctivitis and skin spots, so humans cannot be exposed to radiation that exceeds the prescribed value. In other words, this should be taken into consideration when designing the sterilization device.(3) Light sourceIncreasing the lamp current of a low-voltage light source can obtain a higher light output when the length of the lamp tube is equal, but it will reduce the ultraviolet radiation efficiency (UV radiation power/output power). This is due to the increase in self-absorption and the influence of temperature. The use of mercury gas in the lamp instead of pure mercury can reduce the effects of these temperatures.2. Radiation intensity standards and detection of ultraviolet germicidal lampsAccording to the requirements stipulated in the "Disinfection Technical Specification", the radiation intensity of the new ultraviolet lamp should be greater than 100VW/cm2 (at a distance of 1m). The minimum radiation intensity of the lamp in use should reach 70uW/cm2 for temporary use, but the irradiation time must be extended. According to the formula of "UV radiation dose equal to radiation intensity multiplied by irradiation time", the prolonged irradiation time required for different intensities can be obtained. It can also be seen that high intensity short time or low intensity long time can obtain the same bactericidal effect. If the intensity of the ultraviolet light source is lower than 40uW/cm2, no longer prolong the irradiation time can play a satisfactory sterilization effect, that is, stop using it. Don't think that as long as the UV lamp is on, it still has a sterilizing effect.
For the detection of ultraviolet radiation intensity, the UV light intensity meter LS126C with a standard 1 meter test hook must be used. Linshang UV light intensity meter LS125 can also be used to test the UVC mercury lamp and LED light source. This multi-probe UV light intensity meter can also be used to test the