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Part 77-5.2

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Part 7: Light and Radiation·66 entries

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Section 7-52 entries

7-5.1radiant intensity 7-5.2spectral radiant intensity

7-5.2

spectral radiant intensity

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-5.2

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-5.2
urn:iso:std:iso:80000:-7:ed-2:en:item:7-5.2

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-5.2

IEC

urn:iec:std:iec:80000-7:2019:::item:7-5.2

Designations

ENspectral radiant intensity

FRintensité énergétique spectrique

Symbol

I_{e, λ}

(I_{λ})

Notation systems

Rendered

I_{e, λ}

Rendered

(I_{λ})

AsciiMath

I_("e",lambda)

AsciiMath

(I_lambda)

LaTeX

I_{\text{e} , \lambda}

LaTeX

( I_{\lambda} )

Definition

spectral density of radiant intensity, expressed by

I_{e, λ} = \frac{d I_{e}}{d λ}

where $I_{e}$ is radiant intensity (radiant intensity) in terms of wavelength $λ$ (ISO 80000-3: Space and time)

densité spectrale de l'intensité énergétique, exprimée par

I_{e, λ} = \frac{d I_{e}}{d λ}

où $I_{e}$ est l'intensité énergétique (radiant intensity) en fonction de la longueur d'onde $λ$ (ISO 80000-3: Space and time)

Units

\frac{W}{s r \cdot n m}

watt per steradian nanometre

View related quantities →

k g \cdot m \cdot s^{- 3} \cdot s r^{- 1}

kilogram metre per second cubed steradian

View related quantities →

Notes

The integral of (total) radiant intensity is determined by the wavelength interval $(λ_{1}, λ_{2})$ under consideration:

I_{e} = \int_{λ_{1}}^{λ_{2}} I_{e, λ} d λ

L'intégrale de l'intensité énergétique (totale) est déterminée par l'intervalle de longueurs d'onde $(λ_{1}, λ_{2})$ considéré:

I_{e} = \int_{λ_{1}}^{λ_{2}} I_{e, λ} d λ

Referenced by

luminous intensity

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless quantities

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:t7-5.2

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-5.2
skosxl:prefLabel	"spectral radiant intensity"@en
skosxl:altLabel	"I_("e",lambda)"@en"(I_lambda)"@en
skos:definition	spectral density of radiant intensity, expressed by [stem%unnumbered] ++++ I_("e",lambda) = ("d"I_"e")/("d"lambda) ++++…
skos:note	The integral of (total) radiant intensity is determined by the wavelength interval stem:[(lambda_1, lambda_2)] under con…
isq:hasUnit	W/(srnm) (watt per steradian nanometre)kgms^(-3)sr^(-1) (kilogram metre per second cubed 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