摘要:

为了研究UVC LED杀菌能力的影响因素和应用条件，在不同作用时间和作用距离下使用UVC LED对大肠杆菌进行灭菌处理，并计算杀菌率.实验结果表明，UVC LED的杀菌能力随紫外辐射剂量减小呈指数减小，受到紫外辐射通量、辐照时间、辐照距离三者影响；以本实验光源为例，当辐照时间与辐照距离平方之比大于20/10-2 s/cm2时，UVC LED的杀菌率能够达到99%以上；UVC LED不能通过产生臭氧起到杀菌作用，因此只适用于表面杀菌.通过经验公式，可对UVC LED的使用条件进行估算.基于此，设计了一台紫外杀菌装置样机.

Abstract:

To study the influencing factors and application conditions of UVC LED sterilization ability, Escherichia coli was sterilized by UVC LED at different exposure times and exposure distances, and the sterilization rate was calculated. The experiment results indicate that the sterilization ability of UVC LED decreases exponentially with the decrease of UV dose, which is affected by UV radiation flux, exposure time and exposure distance. Taking the experimental light source as an example, when the ratio of the exposure time to the square of the exposure distance is more than 20/10-2 s/cm2, the sterilization rate of the UVC LED can reach more than 99%. UVC LED can not sterilize by generating ozone, therefore it is only suitable for surface sterilization. Through empirical formula, the application conditions can be estimated. Based on these conclusions, a UVC LED sterilization lamp prototype was designed and produced.