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A cathode ray tube is a device that utilizes a stream of electrons striking a flourescent screen to make them visible. The tube has a vacuum so that the electrons do not encounter air and lose energy. At one end of the tube is a cathode which is an electrical terminal where electrons gather and at another end there is an anode which attracts electrons leaving the cathode. The electrons leave the cathode in a stream or ray and each electron has the same energy depending on the voltage across the electrodes. The electrons encounter a flourescent screen which may be just past the anode. The ray strikes the flourescent tube making a visible spot. The ray is straight unless it passes by an electric or magnetic field. Magnets or electric plates are placed along the path of the ray to bend the ray and make the spot move. The image made on an oscilliscope, radar screen, medical terminals, your PC or older TV is a result of controlling the spot made to "write out" a display according to a signal from the device it is attached to.
A cathode ray tube is a device for producing electronic images by directing a beam of electrons on a screen coated with some fluorescent material. The beam of electron is produced by a cathode. The direction of this beam can be manipulated by suitable means. This enables the beam of electron to strike different pars of the fluorescent screen in a desired sequence and lighting up that part of the screen. In this way different pictures are produced by the CRT. These are used in many different equipments such as TV screens, computer monitors, and oscilloscopes.
A hot CRT is a type of CRT which uses a cathode that is intentionally heated to produce the electron beam. The first CRT with hot cathode were developed independently by John B Johnson and Harry Weiner Weinhart. It became a commercial product in 1922.
The Cathode Ray Tube (CRT) is a vacuum tube containing an electron gun (a source of electrons) and a flurescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen. The image may represent electrical waveforms (oscilloscope), pictures (television, computer monitor), radar targets and others.
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