Both pure water and tap water have good transmission characteristics to the light with wavelengths between 250 and 800 nm. The transmittance of 5 mm thickness is more than 80%. When the wavelength is shorter than 250 nm, the optical absorptivity of both of them increases rapidly. In particular, tap water has a stronger absorption of & lt; 250 nm light. 2.4cm to 70%, 8.5cm to 30%, 16.3cm to 10%.

Based on the topic of effective distance, how far is the penetration distance of UVC ultraviolet in water? The bond energy of H-O bond in water molecule is 485kj / mol, corresponding to 4.98ev, which is about 249nm. Therefore, when testing the transmission spectrum of pure water, it is found that the absorption edge begins to decline at about 249nm. Based on this data, it can be said that the absorption of 275 nm uvc-led is not strong in normal drinking water with less impurities. The ultraviolet sterilization device based on UVC sterilization principle can kill a long distance.

The most important consideration is that the rapid divergence of light in the process of propagation leads to a sharp decrease in the far end intensity. In fact, hemispherical small angle packaging is very common in the UVA industry, which is also applicable to UVC packaging. Small angle light can make UVC spread further. It is very suitable for manufacturers such as water cup, long water tank and over flow water sterilization device.

High environmental humidity does not cause obvious absorption of UVC, which means that even in the sauna room, UVC ultraviolet can be used for real-time sterilization.