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Radiation sources

  • Joseph Caniou
Chapter

Abstract

The emission of an electromagnetic wave by gases, liquids or solids is caused by the transformation of energy within matter. The origins of the phenomena are:
  • thermal radiation (or incandescence) associated with the thermal movement of particles (atoms, molecules, ions) and, by definition, is only dependent on the temperature;

  • luminescence for all other causes other than those associated with a thermal state. The mechanisms for these are varied, noting in particular: triboluminescence of mechanical origin, chemiluminescence with a chemical origin, electroluminescence with electrical origin, cathodoluminescence produced by the impact of electrons on a target, bioluminescence of organic origin, radioluminescence observed after the absorption of α or β particles and photoluminescence after photon absorption... Depending on the time constant, we distinguish between fluorescence and phosphorescence: in the former case the emission follows immediately after the excitation (τ < 10 ns) and in the latter case, it is delayed and lasts longer.

Keywords

Thermal Radiation Spectral Radiance Spectral Average Bidirectional Reflectance Distribution Function Average Spectral Emissivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Joseph Caniou
    • 1
  1. 1.Centre d’Electronique de l’Armement (CELAR)DGABruzFrance

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