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image amplifier

Image intensifiers or residual light amplifiers are electronic components that amplify images of low light intensity so that the viewer can recognize the images. They are used wherever there is insufficient illuminance

to view images. Image intensifiers are used for the lowest illuminance levels of less than 0.1 lux (lx). In principle, they are electron tubes with an input phosphor screen, a focusing and acceleration system for the electron beam and a small photocathode for the image display. The incident image falls on the input phosphor screen, which is formed by a photocathode. The electrons released from the cathode are accelerated by high voltage and focused in the focusing system. The focused electron beam strikes a phosphor layer on which the image is reduced in size and displayed in focus. Highly sensitive CCD sensors

are analternative for image reproduction.

Image intensifiers are used, among other things, in military applications in infrared and night vision devices, for thermal imaging in X-ray technology and for UV imaging.

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Englisch: image amplifier
Updated at: 07.11.2018
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