针对紫外告警的关键元器件——紫外探测器，简述了紫外告警的特点及发展，紫外辐射的大气传输特性和紫外探测器的发展。详细介绍了一种新型响应波段为105 nm～300 nm的真空型紫外成像探测器，其光电阴极具有“日盲性”，管型采用近贴聚焦结构，从而使得弥散和像差得以减小。探测器读出系统有光耦合读出和电耦合读出2种读出方法：光耦合读出系统能实时响应；电耦合读出灵敏度高，分辨力强，探测距离远。采用自动门控BSP电源，可实现大动态范围探测，并对光电阴极和微通道板起到保护作用。

The development of ultraviolet warning and its key device is introduced,including the characteristics and development of ultraviolet warning,ultraviolet radiation transmittance and the development of ultraviolet detector. A new vacuum ultraviolet detector is described,its photocathode is a solar-blind,a proximity focus tube with less dispersion and image distortion is adopted,its read-out system has light-coupling and electricity-coupling,the light-coupling readout system is simpler and responds in real time,the electricity-coupling read-out has high sensitivity and resolution as well as long detection distance. Auto gating BSP power supply is adopted to extend dynamic range,protect photocathode and microchannel plate.