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Photonics Dictionary

  • image dissector tube

An electron tube that is used as a camera tube for a television system. When the picture to be transmitted is focused on a photosensitive surface, electrons are emitted from each section of the surface, in proportion to the amount of light in that certain part of the picture, and are then drawn down the tube by a positive anode. However, a magnetic field still focuses the electrons in an electron reproduction. The focusing fields are changed regularly to sweep the electron picture horizontally and vertically as it travels down the tube. The picture then passes through an aperture into an electron multiplier where the output of the multiplier varies with the different parts of the picture. This output represents the dissecting of the picture into ordered parts to be transmitted.
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