flying spot scanner
Quick Summary
A flying spot scanner is an electronics device used in early television systems to capture images from film. It works by projecting an intense beam of light from a cathode-ray tube (CRT) onto the film. This light beam, moving in a scanning pattern, passes through the film. A photoelectric cell then measures the amount of light that emerges from the other side of the film, converting it into an electrical signal that represents the image. This signal is the basis for transmitting the picture. The term "flying spot" refers to this moving spot of light used for scanning.12
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