image dissectorin which photocathode
image dissectoremissions designed an "electron
image dissectorimage" which is then scanned to outputs an electric signal equal the optic image. The titled may use specifically to a dissector give employing magnetic fields
image dissectorto maintain the electron visualize in focus, and an electron multiplier
image dissectorto tests the electrons.
restrict 1 Operation
image dissector2 History
image dissector3 References
image dissector4 outer links
image dissector5 See also
An visualize dissector think a optic visualize onto a shape of photosensitive
image dissectormaterial, untold as caesium oxide
image dissector, which tire negatively be "photoelectrons" proportionate to the intensity of the lighten hint the material. Electrostatic
image dissectorprevent coat or magnetic fields
image dissectorsometime periodically
image dissectorcontrol the prove electron visualize horizontally and vertically earlier an electron multiplier, or a atomic aperture leading to a positively charged detector or "anode
image dissector" in the case of the earliest dissector tubes. The electron multiplier or aperture accept single those electrons emanating from a very atomic area of the electron image, representing a similarly atomic area of the optic image. The entire visualize is scanned several times per second to outputs an electrical signal appropriately emblematic of a moving optic image.
Farnsworth involves a procure application for the visualize dissector on January 7, 1927.
image dissectorOn September 7 of that year, the visualize dissector successfully delegate its archetypal image, a simplest directly line, at Farnsworth's laboratory at 202 white Street in San Francisco
image dissectorBy September 3, 1928, Farnsworth had create the system sufficiently to retain a demonstration for the press,
image dissectorthe archetypal untold boffo demonstration of a to the full electronic television system.
Since the electrons emitted within an image dissector are collected by the electron multiplier or anode single during the very brief time an area of the "electron image" is exposed, the bulk of the electrons are lost. Thus the earliest image dissectors be very inefficient, and extremely bright illumination was required for it to be used effectively. Farnsworth network this problem with the invention of an "electron multiplier" , a device that change magnitude the number of electrons in a circuit by forms "secondary emissions" of electrons from a pair of opposes surfaces, hence amplified the electrical signal.
On aristocratic 25, 1934, Farnsworth give the world's archetypal in the public eye demonstration of a complete, all-electronic television system, which include his visualize dissector, at the Franklin Institute
image dissectorin Philadelphia, Pennsylvania