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phototube |
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phototube [′fōd·ō‚tüb] (electronics) An electron tube containing a photocathode from which electrons are emitted when it is exposed to light or other electromagnetic radiation. Also known as electric eye; light-sensitive tube; photoelectric tube. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The phototube and photometer permit determination of the null point with a high degree of sensitivity. Each cone, part of an experiment called CYGNUS, contains a plastic sheet that scintillates when a particle strikes it; a phototube at the top of each cone senses the faint burst of light. For better timing of showers, a third reflector, this one 7 meters across and reflecting light on a similar phototube array, will be placed 240 meters from the other two. |
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