1 Introduction <br> UV radiation is optical radiation wavelength range of about 10 ~ 400nm. In this wavelength range, different wavelengths of ultraviolet radiation have different effects. In research and application, ultraviolet radiation is often divided into: A-band (400-320 nm); B-band (320-280 nm); C-band (280-200 nm). ); vacuum ultraviolet band (200 ~ 10nm). Ultraviolet radiation having a wavelength of less than 200 nm cannot propagate in the air due to absorption by the atmosphere.
The development and application of ultraviolet light source is in a period of rapid development. The continuous development of ultraviolet light source has gradually filled the gap of light source in various ultraviolet bands. Currently available
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