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    The history of night vision

    • Author:Durham Technology
    • Release on :2018-11-21

    Night vision goggles (NVG), is anoptoelectronic device that allows images to be produced in levels of light approaching total darkness。

    The history of night vision devices goes back to just before World War II, when Germany developed primitive infrared devices, and the Allies followed suit. ... Devices like the small starlight scope were crucial in the Vietnam War, with soldiers often fighting in low-light jungle conditions. The technology has evolved greatly since their introduction, leading to several "generations" of night vision equipment with performance increasing and price decreasing.


    The first devices were being developed by AEG starting in 1935. Parallel development of night vision systems occurred in the United States. Their image intensifier tubes function using an anode and an S-1 photocathode, made primarily of silver, caesium, and oxygen to accelerate the electrons.


    First generation rely on ambient light instead of an infrared light source. Using an S-20 photocathode, their image intensifiers produce a light amplification of around 1000x, but are quite bulky and require moonlight to function properly.


    Second generation devices feature an improved image-intensifier tube utilizing micro-channel plate (MCP) with an S-25 photocathode, resulting in a much brighter image, especially around the edges of the lens.

    This leads to increased illumination in low ambient light environments, such as moonless nights. Light amplification is around 20,000x. Also improved were image resolution and reliability.


    Third generation night vision systems maintain the MCP from Gen II, but now use a photocathode made with gallium arsenide, which further improves image resolution. In addition, the MCP is coated with an ion barrier film for increased tube life. The light amplification is also improved to around 30,000-50,000x.


    Historically, the U.S. Army has defined each Generation of night vision. U.S. Army to recant the existence of Gen 4 definition, Recognizing the high failure rates of Gen 4 tubes.

    All night vision devices have heavy, common problems of fear of light.  CMOS system has aspherical objective lens + sensor (made in Korea)+ photoelectric conversion version, video processor, image display panel + OLED display, CMOS higher sensitivity, shorter exposure times and shrinking pixelsize. In the daytime, the heat reads exactly as it does in the dark. The collected thermal information can not be "exposed" and the highlight of the capacity is still of great value in daylight. A goal in camouflage or far will transmit the heat that the device will send, regardless of the sun's brightness.

    CMOS is not currently defined as the generation 4 in the true sense, but the performance is higher than the generation 3.

    New CMOS night vision feature are lighter and clearer than regular light intensified technology, and never worry about burnt out when exposed in strong light.