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INTENSITE ENERGETIQUE SOURCE DIRECTION [1 record]

Record 1 2004-04-20

English

Subject field(s)
  • Electromagnetic Radiation
  • Scientific Measurements and Analyses
  • Meteorology
DEF

Quotient of the radiant power emitted by a source, or by an element of source, in an infinitesimal cone with its axis in the specific direction, by the solid angle of that cone.

CONT

Radiant intensity is a quantitative expression of the brilliance of a source of electromagnetic (EM) energy over the entire electromagnetic spectrum. This quantity is measured in terms of the power emitted per unit solid angle from an isotropic radiator, a theoretical point source that radiates equally in all directions in three-dimensional space.

OBS

The standard unit of radiant intensity is the watt per steradian (W/sr or W ? sr-1).

OBS

radiant intensity is a term of radiometry. Luminous intensity (cd) is the photometric equivalent of radiant intensity.

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Mesures et analyse (Sciences)
  • Météorologie
DEF

Quotient du flux énergétique émis par une source ou par un élément de source dans un cône infiniment petit ayant pour axe cette direction, par l'angle solide de ce cône.

OBS

L'intensité énergétique sert à mesurer la distribution spatiale du flux énergétique.

OBS

L'intensité énergétique s'exprime en Watt par stéradian (W.sr-1).

Spanish

Campo(s) temático(s)
  • Radiación electromagnética
  • Medición y análisis (Ciencias)
  • Meteorología
DEF

Cociente entre la potencia de la radiación emitida por una fuente, o por un elemento de una fuente, dentro de un cono infinitesimal, que contiene la dirección dada por el ángulo sólido subtendido por dicho cono.

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