Editing Image intensifier (section)

{{Short description|Vacuum tube device for increasing the intensity of available light}}
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An '''image intensifier''' or '''image intensifier tube''' is a [[vacuum tube]] device for increasing the intensity of available light in an [[optical system]] to allow use under low-light conditions, such as at night, to facilitate visual imaging of low-light processes, such as fluorescence of materials in [[X-ray]]s or [[gamma ray]]s ([[X-ray image intensifier]]), or for conversion of non-visible light sources, such as near-[[infrared]] or short wave infrared to visible. They operate by converting photons of light into electrons, amplifying the electrons (usually with a [[microchannel plate]]), and then converting the amplified electrons back into photons for viewing. They are used in devices such as [[night-vision device|night-vision goggles]].