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Physics, Techniques and Procedures

Television

from a Greek term meaning "distant viewing", 1) an electrical system that converts visual images into signals and transmits the signals by means of wires or carrier waves to remote receivers, or 2) a device for receiving such transmissions; a television set.

Television was invented in the 1920s and was patented in 1925. It established itself as an important means for production, transmission and reception of live, moving images in the 1940s. Since the 1950s television systems have also been used in fluoroscopy systems for X-ray imaging together with an image intensifier. For such purposes a so-called "closed-circuit" system is used, i.e. the images are available only at the television monitor connected directly to the television camera. See also video.

MN