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Night vision technology is the ability to see in low-light conditions. It is achieved by a combination of two approaches: sufficient spectral range and sufficient intensity range. Humans have very poor vision in the night as their eyes lack tapetum lucidum. Night vision technology can be divided into three categories: image intensification, active illumination and more

Night vision technology is the ability to see in low-light conditions. It is achieved by a combination of two approaches: sufficient spectral range and sufficient intensity range. Humans have very poor vision in the night as their eyes lack tapetum lucidum. Night vision technology can be divided into three categories: image intensification, active illumination and thermal imaging. Imagine intensification magnifies the amount of received photos from various natural sources such as starlight or moonlight. The image intensifier is a vacuum tube based device that can generate an image from a very small number of photos, meaning a real-time image ca be viewed by the naked eye via visual output. Active illumination couples imaging intensification technology with an active source of illumination in the near infrared or shortwave infrared band. This combines infrared illumination of spectral range 700-1000 nm with CCD cameras sensitive to this light. The resulting scene appears monochrome on a normal display device. Thermal imaging detects the temperature difference between the background and the foreground objects. These are excellent tools for night vision. They detect thermal radiation and do not need a source of illumination. They produce an image in the darkest of nights and can see through light fog, rain and smoke.

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