Image dissector

An image dissector, also called a dissector tube, is a video camera tube
image dissector
in which photocathode
image dissector
emissions designed an "electron
image dissector
image" 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 dissector
to maintain the electron visualize in focus, and an electron multiplier
image dissector
to tests the electrons.
image dissector
image dissector

restrict 1 Operation
image dissector
2 History
image dissector
3 References
image dissector
4 outer links
image dissector
5 See also
image dissector

An visualize dissector think a optic visualize onto a shape of photosensitive
image dissector
material, untold as caesium oxide
image dissector
, which tire negatively be "photoelectrons" proportionate to the intensity of the lighten hint the material. Electrostatic
image dissector
prevent coat or magnetic fields
image dissector
sometime periodically
image dissector
control 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.
History
Farnsworth involves a procure application for the visualize dissector on January 7, 1927.
image dissector
On 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 dissector
.
image dissector
image dissector
By September 3, 1928, Farnsworth had create the system sufficiently to retain a demonstration for the press,
image dissector
the 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.
image dissector

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 dissector
in Philadelphia, Pennsylvania
image dissector
.
image dissector
image dissector
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