AskDefine | Define photodetector

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Extensive Definition

Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties:
  • Optical detectors, which are mostly quantum devices in which an individual photon produces a discrete effect.
  • Cryogenic detectors are sufficiently sensitive to measure the energy of single x-ray, visible and near infra-red photons.
  • Charge-coupled devices (CCD), which are used to record images in astronomy, digital photography, and digital cinematography. Although before the 1990s photographic plates were the most common in astronomy. Glass-backed plates were used rather than film, because they do not shrink or deform in going between wet and dry condition, or under other disturbances. Unfortunately, Kodak discontinued producing several kinds of plates between 1980 and 2000, terminating the production of important sky surveysT. M. Girard et al, (May 2004) Astronomical Journal, 127, 3060.. The next generation of astronomical instruments, such as the Astro-E2, include cryogenic detectors. In experimental particle physics, a particle detector is a device used to track and identify elementary particles.

See also

References

photodetector in Czech: Detektor záření
photodetector in German: Lichtsensor
photodetector in Spanish: Fotocelda
photodetector in Indonesian: Sensor cahaya
photodetector in Italian: Sensore di immagini
photodetector in Latvian: Fotoelements
photodetector in Lithuanian: Fotoelementas
photodetector in Japanese: 光検出器
photodetector in Russian: Фотосенсор
photodetector in Slovak: Fotodetektor
photodetector in Slovenian: Detektor svetlobe
photodetector in Swedish: Fotodetektor
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