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7-22

photon radiance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-22

https://metanorma.github.io/isq-smart/quantities/part-7/t7-22
urn:iso:std:iso:80000:-7:ed-2:en:item:7-22

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-22

IEC

urn:iec:std:iec:80000-7:2019:::item:7-22

Designations

ENphoton radiance

FRluminance photonique

Symbol

L_{p}

(L)

Notation systems

Rendered

L_{p}

Rendered

(L)

AsciiMath

L_"p"

AsciiMath

(L)

LaTeX

L_{\text{p}}

LaTeX

( L )

Definition

density of photon intensity with respect to projected area in a specified direction at a specified point on a real or imaginary surface, expressed by

L_{p} = \frac{d I_{p}}{d A} \frac{1}{cos α}

where $I_{p}$ is photon intensity (photon intensity), $A$ is area (ISO 80000-3: Space and time) and $α$ the angle between the normal to the surface at the specified point and the specified direction

quotient de l'intensité photonique reçue par un élément d'une surface réelle ou fictive contenant un point spécifié par l'aire de la projection de cet élément dans une direction spécifiée, exprimé par

L_{p} = \frac{d I_{p}}{d A} \frac{1}{cos α}

où $I_{p}$ est l'intensité photonique (photon intensity), $A$ est l'aire (ISO 80000-3: Space and time) et $α$ est l'angle entre la normale à la surface au point spécifié et la direction spécifiée

Units

m^{- 2} \cdot s^{- 1} \cdot s r^{- 1}

per square metre second steradian

View related quantities →

Notes

The corresponding radiometric quantity is "radiance" (radiance). The corresponding photometric quantity is "luminance" (luminance).

La grandeur radiométrique correspondante est la «luminance énergétique» (radiance). La grandeur photométrique correspondante est la «luminance» (luminance).

Referenced by

radiance luminance

Concept HierarchyPendrill (2024)

L⁻² T⁻¹L⁻² T⁻¹ quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻² T⁻¹ quantities

Characterizes

● photon

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t7-22

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-22
skosxl:prefLabel	"photon radiance"@en
skosxl:altLabel	"L_"p""@en"(L)"@en
skos:definition	density of photon intensity with respect to projected area in a specified direction at a specified point on a real or im…
skos:note	The corresponding radiometric quantity is "radiance" (<<t7-6.1>>). The corresponding photometric quantity is "luminance"…
isq:hasUnit	m^(-2)s^(-1)sr^(-1) (per square metre second steradian)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-7

Related Entities

isq:QuantityShape isq:part-7 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry