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7-21

photon intensity

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-21

https://metanorma.github.io/isq-smart/quantities/part-7/t7-21
urn:iso:std:iso:80000:-7:ed-2:en:item:7-21

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-21

IEC

urn:iec:std:iec:80000-7:2019:::item:7-21

Designations

ENphoton intensity

FRintensité photonique

Symbol

I_{p}

(I)

Notation systems

Rendered

I_{p}

Rendered

(I)

AsciiMath

I_"p"

AsciiMath

(I)

LaTeX

I_{\text{p}}

LaTeX

( I )

Definition

density of photon flux with respect to solid angle in a specified direction, expressed by

I_{p} = \frac{d Φ_{p}}{d Ω}

where $Φ_{p}$ is the photon flux (photon flux) emitted in the given direction, and $Ω$ is the solid angle (ISO 80000-3: Space and time) containing that direction

dérivée du flux photonique par rapport à l'angle solide dans une direction spécifiée, exprimée par

I_{p} = \frac{d Φ_{p}}{d Ω}

où $Φ_{p}$ est le flux photonique (photon flux) émis dans la direction donnée, et $Ω$ est l'angle solide (ISO 80000-3: Space and time) contenant cette direction

Units

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

per second steradian

View related quantities →

Notes

The distribution of the photon intensities as a function of the direction of emission, e.g. given by the polar angles $(ϑ, φ)$ , is used to determine the photon flux (photon flux) within a certain solid angle (ISO 80000-3: Space and time) $Ω$ of a source:

Φ_{p} = & # 8748;_{Ω} I_{p} (ϑ, φ) sin ϑ d φ d ϑ

The corresponding radiometric quantity is "radiant intensity" (radiant intensity). The corresponding photometric quantity is "luminous intensity" (luminous intensity).

La répartition des intensités photoniques en fonction de la direction d'émission, par exemple donnée par les coordonnées angulaires $(ϑ, φ)$ , est utilisée pour déterminer le flux photonique (photon flux) à l'intérieur d'un angle solide (ISO 80000-3: Space and time) donné, $Ω$ , d'une source:

Φ_{p} = & # 8748;_{Ω} I_{p} (ϑ, φ) sin ϑ d φ d ϑ

La grandeur radiométrique correspondante est l'«intensité énergétique» (radiant intensity). La grandeur photométrique correspondante est l'«intensité lumineuse» (luminous intensity).

Referenced by

radiant intensity luminous intensity photon radiance

Concept HierarchyPendrill (2024)

T⁻¹frequency-type quantitiesLevel 0 · Kind

Broader concepts

◇ frequency-type quantities

Characterizes

● photon● source

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:t7-21

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-21
skosxl:prefLabel	"photon intensity"@en
skosxl:altLabel	"I_"p""@en"(I)"@en
skos:definition	density of photon flux with respect to solid angle in a specified direction, expressed by [stem%unnumbered] ++++ I_"p" …
skos:note	The distribution of the photon intensities as a function of the direction of emission, e.g. given by the polar angles st…
isq:hasUnit	s^(-1)*sr^(-1) (per 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