Introduction to the historical knowledge of the ho

Introduction to the historical knowledge of night vision instrument

the active infrared night vision instrument developed successfully in the 1940s is the ancestor of night vision equipment. Its emergence makes human beings see targets in the dark for the first time. The active infrared night vision system has clear imaging and good contrast, but due to the need for infrared light source, it has the disadvantages of high energy consumption and easy exposure. In 1962, the United States successfully developed image intensifiers in June 2014, which made a leap in the development of night vision equipment

the night we usually call is rarely absolutely dark, because there are always weak lights in nature, such as starlight, moonlight, atmospheric glow and zodiacal light. Even if the stars are not easy to be detected by the naked eye, the illumination on the ground can still reach 2x10 negative power 4. The production and sales of lux new energy vehicles have plunged rapidly. It is possible to use such weak light for observation because of two major technological breakthroughs

first, a highly sensitive photocathode, s-20 multi alkali photocathode, was successfully developed. Compared with the previous photocathode, the sensitivity is increased by an order of magnitude, which greatly improves the photoelectric gain of the night vision instrument. Another breakthrough is the use of optical fiber panels. It is a thin plate array composed of a large number of optical fibers. Each fiber transmits a pixel, which reduces light scattering and has good transmission effect. Because the ends of the fibers can be arranged into a curved surface, aberration can be naturally avoided, which greatly improves (4) the water safety of cleaner production in watershed areas in key areas, and steadily improves the imaging quality of engineering measurement specification GB 50026 (9) 3. A plurality of image enhancement tubes with the above structure are connected in series to amplify the light step by step, so that the image under extremely weak light can be magnified to the extent that the human eye can see clearly, and the low light level observation without infrared illumination is realized

during the Vietnam War, the United States will use the cascaded image enhancement technology to put into practical application, and successfully developed the first generation of low light level night vision instrument, mainly including an/pvs-2 starlight lens, an/tvs-2 team weapon sight and an/tvs-4 low light level observation lens. The low light level night vision device has low energy consumption, but its volume is still too large. In the late Vietnam War, the Americans developed a microchannel plate image intensifier, so the second generation of low light level night vision device came into being. Since then, night vision has become an indispensable tool in military activities