人们常用“伸手不见五指”来比喻黑暗,如今,人们会用很多办法看清黑暗中的“五指”。大家知道,漆黑的夜晚只是白天光照强度的十万分之一。有一种装置能增强黑暗中物象的亮度,以达到人眼能看清的程度。这种装置就是微光夜视仪。这种微光夜视仪,利用放大天然微光的原理,由一块光纤板、一组电子透镜和显示荧光屏所组成。当物象射来的微弱光线照在光纤板上时,涂在板面上的砷化镓光电阴极激发出光电子,再通过透镜的电子聚焦,在荧光屏上会显示一个亮 People commonly use the “no-name” to describe the darkness. Nowadays, people will see the “five fingers” in the darkness in many ways. We all know that the dark night is only one hundred thousandth of daylight intensity. There is a device that enhances the brightness of objects in the dark to the point where the human eye can see. This device is a low light night vision. This glimmer night vision device, using the principle of magnifying natural glimmer, consists of a fiber plate, a set of electronic lenses and a display phosphor screen. When the weak light emitted by the object image shines on the fiber plate, the gallium arsenide photocathode coated on the plate surface excites the photoelectrons and then focuses the electrons through the lens to show a bright