TERMIUM Plus®

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LUMINANCE ENERGETIQUE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-07-08

English

Subject field(s)
  • Electromagnetic Radiation
  • Atmospheric Physics
  • Space Physics
DEF

... a measure of radiometric flux density per unit solid angle.

OBS

Unlike irradiance, radiance is a property solely of a radiation field, not of the orientation of the surface. ... In general, radiance depends on time, position, and direction as well as frequency (monochromatic or spectral radiance) or range of frequencies.

OBS

Do not confuse "radiance" with "luminance" which is the photometric equivalent of radiance and is expressed in candelas per square meter (cd/m²).

OBS

Standard units of radiance are watts per square meter and steradian: W . m-2. sr-1 or W/(m².sr).

OBS

radiance: term officially approved by the RADARSAT-2 Terminoology Approval Group (RTAG).

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Physique de l'atmosphère
  • Physique spatiale
DEF

Flux énergétique émis par unité de surface de la source, par unité d'angle solide, dans une direction donnée.

OBS

Unités SI de la «luminance énergétique» : watt par mètre carré par stéradian; W . m[indice-²] . sr-1 ou W/(sr.m²).

OBS

luminance : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Radiación electromagnética
  • Física de la atmósfera
  • Física espacial
DEF

[...] flujo luminoso que la [superficie luminosa] emite por unidad de superficie, expresado en lux o en fots.

Save record 1

Record 2 1986-02-25

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Thermal Insulation
CONT

This instrument measures the average radiance over a specific spectral region.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Isolation thermique

Spanish

Save record 2

Record 3 1985-11-01

English

Subject field(s)
  • Optics
  • Electromagnetic Radiation
DEF

Ratio of the radiance of the body to that of a perfect reflecting or transmitting diffuser identically irradiated.

French

Domaine(s)
  • Optique
  • Rayonnements électromagnétiques
DEF

Rapport de la luminance énergétique du corps à celle d'un diffuseur parfait par réflexion ou par transmission irradié dans les mêmes conditions.

Spanish

Save record 3

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