美军在20世纪90年代提出了“拥有黑夜”的主张,希望通过装备大量的夜视设备,可以进行全天候的作战。 ■夜视技术的奥秘 我们知道,人眼的视觉所能直接利用的只是电磁波谱中一个十分狭窄的波段.即0.38—0.76微米的可见光波段。白天,在阳光的照射下,环境照度很高,使各种不同景物产生很大的反差,场景中的图像有很高的对比度,从而为人眼视觉提供了十分理想的观察条件。到了夜晚,光线逐渐减弱,视网膜在单位时间内所能接收到 The U.S. military put forward the idea of ​​“having a dark night” in the 1990s and hoped that it would be capable of conducting all-weather operations by equipping a large number of night-vision equipment. ■ The mystery of night vision technology We know that the human eye’s vision can only be a direct use of the electromagnetic spectrum in a very narrow band, which is 0.38-0.76 micron visible band. During the day, under the illumination of sunlight, the ambient illumination is very high, making a great contrast between various scenes. The images in the scene have high contrast, which provides a very ideal observation condition for human eye vision. At night, the light gradually weakened, the retina can receive within a unit of time