The principle of ultraviolet disinfection technology is to directly use the deep ultraviolet with high photon energy to destroy the gene of the pathogen, so that it can not reproduce again, so as to achieve the germicidal effect. However, due to the colorless, tasteless and invisible characteristics of the technology, there are obvious security risks in the use process. Specifically:

1. The key to achieve effective sterilization is to obtain enough deep ultraviolet radiation. However, both deep ultraviolet light and tiny bacteria are invisible to human eyes; therefore, ordinary consumers can not directly perceive the sterilization effect. The actual situation is: the light intensity of the existing ultraviolet light source will continue to decline with time, or the surface of the light source will be covered by stubborn scale, and the corresponding sterilization effect will be worse and worse. If the ordinary user is not sure whether the UV disinfection lamp is in normal working state, how to ensure the disinfection process to achieve the desired effect? Do you dare to use this kind of ultraviolet water purifier?

2. Although deep ultraviolet light can sterilize effectively, it is also harmful to human body. Excessive UV irradiation can lead to mass necrosis or mutation of human cells, which is the main cause of skin cancer and cataract. If the daily ultraviolet disinfection cabinet, ultraviolet air purifier and ultraviolet water purifier are not used properly, there is a risk of "UV leakage". The danger is that because UV light is not visible, it is difficult for ordinary people to know whether there is a leak in the short term, but it is too late to find out. In 2016, there was a tragedy in a kindergarten in Hangzhou that, due to the negligence of the staff, the UV disinfection lamp was forgotten to turn off when someone was there, resulting in serious visual impairment of many children in the class.

To sum up, in order to use UV LED disinfection technology safely and reliably, it is necessary to monitor the UV irradiation process in real time, which requires the use of semiconductor UV sensors. The high-performance ultraviolet sensor can not only detect the presence of deep ultraviolet quickly and prevent "ultraviolet leakage"; but also can measure and calibrate the ultraviolet radiation dose in real time, and establish feedback mechanism with the control unit of ultraviolet disinfection lamp to ensure the effect of ultraviolet sterilization. China has always attached great importance to the development of semiconductor UV sensing technology. The domestic wide band gap semiconductor UV sensor has been widely used in water quality inspection, flame monitoring, UV curing and UV disinfection equipment radiation dose monitoring and other fields, and is gradually entering the intelligent wearable market through modular integration with silicon-based signal processing circuit for real-time monitoring of sunlight ultraviolet intensity.