Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cathode that emits electrons when exposed to light

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a cathode that emits electrons when illuminated

Etymologies

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Examples

  • The photon sensitivity of the GaAs photocathode extends into the near-infrared region, where night sky illumination and contrast ratios are highest.

    Defense Industry Daily

  • Low levels of ambient light pass through a photocathode that converts the light photons to electrons, then amplifies them.

    Defense Industry Daily

  • Sealed to an input window that minimizes veiling glare, the photocathode generates an electron current which is proximity focused onto a phosphor screen, where the electron energy is converted into green light that can then be relayed to the eye or sensor through an output window.

    Defense Industry Daily

  • First, an automatic gated power supply system regulates the photocathode voltage, allowing the device to adapt instantaneously to changing light conditions.

    Defense Industry Daily

  • Requiring over 460 manufacturing steps, the Generation III intensifier is typically characterized by a gallium arsenide (GaAs) photocathode.

    Defense Industry Daily

  • These devices respond when photons impinge on a photocathode and liberate electrons that are accelerated toward an electron multiplier composed of a series of curved plates, known as dynodes.

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  • In vidicons, the photosensitive surface stores charge rather than liberating electrons as in a photocathode.

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  • The photocathode in the latest generation of these devices, while similar to that in photomultiplier tubes, has a higher quantum efficiency (up to 50 percent) in the blue-green end of the spectrum.

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  • Two of the curves (the lower curves in Figure 3) were generated with PMTs having photocathode compositions utilizing either gallium-arsenide-phosphide (Ga-AS-P) or gallium-arsenide (Ga-As) alloys, while the third curve represents the response of a silicon photodiode with a ultraviolet-transparent window.

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  • In this device, photons are detected by a photocathode similar to that in an image intensifier.

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