The light pulse to be measured is focused onto the photo cathode of the streak tube through the slit, where the photons are converted into a number of electrons proportional to the intensity of the incident light. These electrons are accelerated and conducted towards the phosphor screen, and a high-speed voltage which is synchronised to the incident light is applied.
The electrons are swept at high speed from top to bottom, after which they are bombarded against the phosphor screen of the streak tube and converted to an optical image. When the light intensity of the streak image is very weak, an image intensifier amplifies the low light level streak image.
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