Usuario:Mcapdevila/Radiometry
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Quantity | Unit | Dimension | Notes | |||||
---|---|---|---|---|---|---|---|---|
Name | Symbol[nb 1] | Name | Symbol | Symbol | ||||
Radiant energy | Qe[nb 2] | joule | J | M⋅L2⋅T−2 | Energy of electromagnetic radiation. | |||
Radiant energy density | we | joule per cubic metre | J/m3 | M⋅L−1⋅T−2 | Radiant energy per unit volume. | |||
Radiant flux | Φe[nb 2] | watt | W or J/s | M⋅L2⋅T−3 | Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power". | |||
Spectral flux | Φe,ν[nb 3] or |
watt per hertz or |
W/Hz or |
M⋅L2⋅T−2 or |
Radiant flux per unit frequency or wavelength. The latter is commonly measured in W⋅sr−1⋅m−2⋅nm−1. | |||
Radiant intensity | Ie,Ω[nb 5] | watt per steradian | W/sr | M⋅L2⋅T−3 | Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a directional quantity. | |||
Spectral intensity | Ie,Ω,ν[nb 3] or |
watt per steradian per hertz or |
W⋅sr−1⋅Hz−1 or |
M⋅L2⋅T−2 or |
Radiant intensity per unit frequency or wavelength. The latter is commonly measured in W⋅sr−1⋅m−2⋅nm−1. This is a directional quantity. | |||
Radiance | Le,Ω[nb 5] | watt per steradian per square metre | W⋅sr−1⋅m−2 | M⋅T−3 | Radiant flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit projected area. This is a directional quantity. This is sometimes also confusingly called "intensity". | |||
Spectral radiance | Le,Ω,ν[nb 3] or |
watt per steradian per square metre per hertz or |
W⋅sr−1⋅m−2⋅Hz−1 or |
M⋅T−2 or |
Radiance of a surface per unit frequency or wavelength. The latter is commonly measured in W⋅sr−1⋅m−2⋅nm−1. This is a directional quantity. This is sometimes also confusingly called "spectral intensity". | |||
Irradiance | Ee[nb 2] | watt per square metre | W/m2 | M⋅T−3 | Radiant flux received by a surface per unit area. This is sometimes also confusingly called "intensity". | |||
Spectral irradiance | Ee,ν[nb 3] or |
watt per square metre per hertz or |
W⋅m−2⋅Hz−1 or |
M⋅T−2 or |
Irradiance of a surface per unit frequency or wavelength. The terms spectral flux density or more confusingly "spectral intensity" are also used. Non-SI units of spectral irradiance include Jansky = 10−26 W⋅m−2⋅Hz−1 and solar flux unit (1SFU = 10−22 W⋅m−2⋅Hz−1). | |||
Radiosity | Je[nb 2] | watt per square metre | W/m2 | M⋅T−3 | Radiant flux leaving (emitted, reflected and transmitted by) a surface per unit area. This is sometimes also confusingly called "intensity". | |||
Spectral radiosity | Je,ν[nb 3] or |
watt per square metre per hertz or |
W⋅m−2⋅Hz−1 or |
M⋅T−2 or |
Radiosity of a surface per unit frequency or wavelength. The latter is commonly measured in W⋅m−2⋅nm−1. This is sometimes also confusingly called "spectral intensity". | |||
Radiant exitance | Me[nb 2] | watt per square metre | W/m2 | M⋅T−3 | Radiant flux emitted by a surface per unit area. This is the emitted component of radiosity. "Radiant emittance" is an old term for this quantity. This is sometimes also confusingly called "intensity". | |||
Spectral exitance | Me,ν[nb 3] or |
watt per square metre per hertz or |
W⋅m−2⋅Hz−1 or |
M⋅T−2 or |
Radiant exitance of a surface per unit frequency or wavelength. The latter is commonly measured in W⋅m−2⋅nm−1. "Spectral emittance" is an old term for this quantity. This is sometimes also confusingly called "spectral intensity". | |||
Radiant exposure | He | joule per square metre | J/m2 | M⋅T−2 | Radiant energy received by a surface per unit area, or equivalently irradiance of a surface integrated over time of irradiation. This is sometimes also called "radiant fluence". | |||
Spectral exposure | He,ν[nb 3] or |
joule per square metre per hertz or |
J⋅m−2⋅Hz−1 or |
M⋅T−1 or |
Radiant exposure of a surface per unit frequency or wavelength. The latter is commonly measured in J⋅m−2⋅nm−1. This is sometimes also called "spectral fluence". | |||
Hemispherical emissivity | ε | 1 | Radiant exitance of a surface, divided by that of a black body at the same temperature as that surface. | |||||
Spectral hemispherical emissivity | εν or |
1 | Spectral exitance of a surface, divided by that of a black body at the same temperature as that surface. | |||||
Directional emissivity | εΩ | 1 | Radiance emitted by a surface, divided by that emitted by a black body at the same temperature as that surface. | |||||
Spectral directional emissivity | εΩ,ν or |
1 | Spectral radiance emitted by a surface, divided by that of a black body at the same temperature as that surface. | |||||
Hemispherical absorptance | A | 1 | Radiant flux absorbed by a surface, divided by that received by that surface. This should not be confused with "absorbance". | |||||
Spectral hemispherical absorptance | Aν or |
1 | Spectral flux absorbed by a surface, divided by that received by that surface. This should not be confused with "spectral absorbance". | |||||
Directional absorptance | AΩ | 1 | Radiance absorbed by a surface, divided by the radiance incident onto that surface. This should not be confused with "absorbance". | |||||
Spectral directional absorptance | AΩ,ν or |
1 | Spectral radiance absorbed by a surface, divided by the spectral radiance incident onto that surface. This should not be confused with "spectral absorbance". | |||||
Hemispherical reflectance | R | 1 | Radiant flux reflected by a surface, divided by that received by that surface. | |||||
Spectral hemispherical reflectance | Rν or |
1 | Spectral flux reflected by a surface, divided by that received by that surface. | |||||
Directional reflectance | RΩ | 1 | Radiance reflected by a surface, divided by that received by that surface. | |||||
Spectral directional reflectance | RΩ,ν or |
1 | Spectral radiance reflected by a surface, divided by that received by that surface. | |||||
Hemispherical transmittance | T | 1 | Radiant flux transmitted by a surface, divided by that received by that surface. | |||||
Spectral hemispherical transmittance | Tν or |
1 | Spectral flux transmitted by a surface, divided by that received by that surface. | |||||
Directional transmittance | TΩ | 1 | Radiance transmitted by a surface, divided by that received by that surface. | |||||
Spectral directional transmittance | TΩ,ν or |
1 | Spectral radiance transmitted by a surface, divided by that received by that surface. | |||||
Hemispherical attenuation coefficient | μ | reciprocal metre | m−1 | L−1 | Radiant flux absorbed and scattered by a volume per unit length, divided by that received by that volume. | |||
Spectral hemispherical attenuation coefficient | μν or |
reciprocal metre | m−1 | L−1 | Spectral radiant flux absorbed and scattered by a volume per unit length, divided by that received by that volume. | |||
Directional attenuation coefficient | μΩ | reciprocal metre | m−1 | L−1 | Radiance absorbed and scattered by a volume per unit length, divided by that received by that volume. | |||
Spectral directional attenuation coefficient | μΩ,ν or |
reciprocal metre | m−1 | L−1 | Spectral radiance absorbed and scattered by a volume per unit length, divided by that received by that volume. | |||
See also: SI· Radiometry· Photometry |
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