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INCIDENT LUMINOUS FLUX [10 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-05-16

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Optical Glass
  • Electromagnetic Radiation
Universal entry(ies)
tau(lambda)
symbol, see observation
DEF

The ratio of the spectral radiant or luminous flux transmitted by the material to the incident spectral radiant or luminous flux at any specified wavelength, lambda.

OBS

In the definition, "lambda"must be replaced by the corresponding small, Greek italicized letter.

OBS

tau(lambda): In the symbol, "tau" and "lambda" must be replaced by the corresponding small, Greek italicized letters.

OBS

spectral transmittance; tau(lambda): term, symbol and definition standardized by the International Organization for Standardization (ISO).

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Verres d'optique
  • Rayonnements électromagnétiques
Entrée(s) universelle(s)
tau(lambda)
symbol, see observation
DEF

Rapport du flux énergétique spectral ou du flux lumineux transmis par le matériau au rayonnement incident ou au flux lumineux à une longueur d'onde, lambda, spécifiée.

OBS

Dans la définition, le terme «lambda» est remplacé par la lettre minuscule grecque correspondante écrite en italique.

OBS

tau(lambda) : Dans le symbole, «tau» et «lambda» doivent être remplacés par les lettres minuscules correspondantes grecques écrites en italiques.

OBS

facteur de transmission spectrale; tau(lambda) : terme, symbole et définition normalisés par l'Organisation internationale de normalisation (ISO).

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Vidrios ópticos
  • Radiación electromagnética
Entrada(s) universal(es)
tau(lambda)
symbol, see observation
DEF

Relación entre el flujo radiante espectral transmitido y el flujo espectral incidente.

Save record 1

Record 2 2016-03-18

English

Subject field(s)
  • Engineering Tests and Reliability
  • Optics
DEF

The ratio of the transmitted luminous flux to the incident luminous flux when a parallel beam of light passes through a specimen.

OBS

total luminous transmittance: term and definition standardized by ISO.

French

Domaine(s)
  • Fiabilité, contrôle et essais (Ingénierie)
  • Optique
DEF

Rapport du flux lumineux transmis au flux lumineux incident lorsqu'un faisceau de lumière parallèle traverse une éprouvette.

OBS

transmittance lumineuse totale : terme et définition normalisés par l'ISO.

Spanish

Save record 2

Record 3 2013-10-16

English

Subject field(s)
  • Optics
  • Lighting
DEF

The luminous flux incident on a small surface which lies in a specified direction from a light source and is normal to this direction, divided by the solid angle(in steradians) which the surface subtends at the source of light.

OBS

luminous intensity: term standardized by the International Electrotechnical Commission.

OBS

luminous intensity; light intensity: terms officially approved by the International Civil Aviation Organization (ICAO).

French

Domaine(s)
  • Optique
  • Éclairage
DEF

Flux lumineux envoyé par une source de lumière dans un angle solide unité.

OBS

Cette grandeur s'exprime en candelas.

OBS

intensité lumineuse : terme normalisé par la Commission électrotechnique internationale.

OBS

intensité lumineuse : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Spanish

Campo(s) temático(s)
  • Óptica
  • Iluminación
DEF

Flujo luminoso por unidad de ángulo sólido en una dirección dada.

OBS

intensidad luminosa; intensidad de la luz: términos y definición aceptados oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 3

Record 4 2013-08-05

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Electromagnetic Radiation
  • Optical Glass
Universal entry(ies)
tauv
symbol, see observation
DEF

The ratio of the luminous flux transmitted by an ocular or filter to the incident luminous flux for a specified illuminant and photopic vision.

OBS

This is usually expressed as a percentage ...

OBS

tauv: In the symbol, "tau" must be replaced by the corresponding small, italicized Greek letter, and "v," which is defined as "the photometric quantity indicating that the radiant energy equivalent has been adjusted to take into account the human eye’s spectral sensitivity to visible radiation," must be written in subscript (tauv).

OBS

luminous transmittance; tauv: term, symbol and definition standardized by the International Organization for Standardization (ISO).

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Rayonnements électromagnétiques
  • Verres d'optique
Entrée(s) universelle(s)
tauv
symbol, see observation
DEF

Rapport flux lumineux transmis par un oculaire ou un filtre à la lumière incidente pour un illuminant spécifié et une vision photopique.

OBS

Il est habituellement exprimé en pourcentage [...]

OBS

tauv : Dans le symbole, «tau» doit être remplacé par la lettre minuscule grecque correspondante écrite en italique, et «v», qui signifie «la grandeur photométrique indiquant que l'énergie rayonnante équivalente a été réglée pour tenir compte de la sensibilité spectrale de l'œil au rayonnement visible», s'écrit en indice (tauv).

OBS

facteur de transmission dans le visible; tauv : terme, symbole et définition normalisés par l'Organisation internationale de normalisation (ISO).

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Radiación electromagnética
  • Vidrios ópticos
Entrada(s) universal(es)
tauv
symbol, see observation
DEF

Relación entre el flujo luminoso transmitido por el filtro y el flujo luminoso incidente.

OBS

Para el cálculo debe ser introducida la eficiencia luminosa.

Save record 4

Record 5 - external organization data 2009-08-04

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
02.02.14 (19762)
ISO/IEC standard entry number
DEF

ratio of the transmitted radiant or luminous flux to the incident flux for incident radiation of given spectral composition, polarization and geometrical distribution [IEC 50(845), 845-04-59]

OBS

Unit: 1 [IEC 50 (845), 845-04-59]

OBS

transmittance; t: term, symbol and definition standardized by ISO/IEC [ISO/IEC 19762-2:2008].

French

Spanish

Save record 5

Record 6 - external organization data 2009-08-04

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
02.02.07 (19762)
ISO/IEC standard entry number
DEF

ratio of the reflected radiant or luminous flux to the incident flux in incident radiation of given spectral composition, polarization and geometrical distribution [IEC 50(845), 845-04-58]

OBS

Reflectance (sometimes in AIDC techniques called reflectance factor) is measured on a scale of 0 to 1, at a wavelength or bandwidth of light (spectral response) specified in the particular application specification.

OBS

Barium sulphate or magnesium oxide are used as ’near perfect’ reference white standards (a perfect standard of pure white would have a reflectance of 1,00 at any wavelength of light). The absence of any light in a vacuum is used as reference black standard.

OBS

Samples (such as substrates, inks, etc.) are tested against the standards under similar illumination.

OBS

reflectance: term and definition standardized by ISO/IEC [ISO/IEC 19762-2:2008].

French

Spanish

Save record 6

Record 7 2007-02-05

English

Subject field(s)
  • Space Physics
  • Optics
  • Atmospheric Physics
DEF

Quotient of the luminous flux incident on an infinitesimal element of a surface containing the point under consideration, by the area of that element.

CONT

Illuminance (usually ’E’ in formulas) is the total amount of visible light illuminating (incident upon) a point on a surface from all directions above the surface. This "surface" can be a physical surface or an imaginary plane. Therefore illuminance is equivalent to irradiance weighted with the response curve of the human eye.

OBS

Standard unit for illuminance is Lux (lx) which is lumens per square meter (lm/m²). There are several older units of illuminance: footcandle: 1 fc = 10.764 lx; phot: 1 ph = 10 000 lx. Typical illuminance values are: 1 lx = full moon; 10 lx = street lighting; 100-1 000 lx = workspace lighting; 10 000 lx = surgery lighting; 100 000 lx = plain sunshine.

OBS

"Illumination" is a deprecated term for "illuminance".

OBS

illuminance: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

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

Quotient du flux lumineux reçu par un élément infinitésimal d'une surface entourant le point considéré, par l'aire de cet élément.

OBS

Le symbole de l'éclairement est Er.

OBS

Les unités du Système international (SI) : [...] l'éclairement lumineux E, dont l'unité est le lux (lm/m²) [...]

OBS

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

Spanish

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

Cociente entre el flujo luminoso incidente sobre un elemento infinitesimal de superficie que contiene el punto considerado por el área de dicho elemento.

Save record 7

Record 8 2006-08-08

English

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

Ratio of the radiant or luminous flux reflected by a particular surface to that incident on it.

OBS

Reflectance: formerly reflection factor.

OBS

reflectance: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

PHR

Bidirectional reflectance factor.

PHR

Ground, plant, rock, snow, water reflectance.

Key term(s)
  • factor of reflection

French

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

Rapport du flux énergétique ou lumineux réfléchi par une surface donnée au flux incident sur celle-ci.

OBS

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

PHR

Réflectance bidirectionnelle.

PHR

Réflectance de la neige, de l'eau, des plantes, des roches, du sol.

Spanish

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

Relación entre el flujo radiante o luminoso reflejado por una superficie dada y el flujo que incide sobre ella.

Save record 8

Record 9 2003-09-26

English

Subject field(s)
  • Photography
CONT

A measure of the intensity of light falling on a subject. Synonymous with flux density; stated in terms of units of luminous flux incident upon a unit area(illuminance).

French

Domaine(s)
  • Photographie
CONT

Mesure de l'intensité lumineuse tombant sur un objet. Synonyme de la densité de flux, l'éclairement s'exprime en unité de flux lumineux incident par unité de surface (lumens par mètre carré).

Spanish

Campo(s) temático(s)
  • Fotografía
Save record 9

Record 10 1976-06-19

English

Subject field(s)
  • Vacuum Tubes (Electronics)

French

Domaine(s)
  • Tubes et lampes (Électronique)

Spanish

Save record 10

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