ਫਰਮਾ:SI radiometry units ਇਸ ਹਿੱਸੇ/ਲੇਖ ਨੂੰ ਪੰਜਾਬੀ ਵਿੱਚ ਅਨੁਵਾਦ ਕਰਨ ਦੀ ਜਰੂਰਤ ਹੈ ਹੈ। ਤੁਸੀਂ ਇਸਦਾ ਪੰਜਾਬੀ ਵਿੱਚ ਅਨੁਵਾਦ ਕਰਕੇ ਵਿਕੀਪੀਡੀਆ ਦੀ ਮਦਦ ਕਰ ਸਕਦੇ ਹੋ। SI radiometry units v t e 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 Φe,λ[nb 4] watt per hertz or watt per metre W/Hz or W/m M⋅L2⋅T−2 or M⋅L⋅T−3 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 Ie,Ω,λ[nb 4] watt per steradian per hertz or watt per steradian per metre W⋅sr−1⋅Hz−1 or W⋅sr−1⋅m−1 M⋅L2⋅T−2 or M⋅L⋅T−3 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 Le,Ω,λ[nb 4] watt per steradian per square metre per hertz or watt per steradian per square metre, per metre W⋅sr−1⋅m−2⋅Hz−1 or W⋅sr−1⋅m−3 M⋅T−2 or M⋅L−1⋅T−3 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 Ee,λ[nb 4] watt per square metre per hertz or watt per square metre, per metre W⋅m−2⋅Hz−1 or W/m3 M⋅T−2 or M⋅L−1⋅T−3 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 Je,λ[nb 4] watt per square metre per hertz or watt per square metre, per metre W⋅m−2⋅Hz−1 or W/m3 M⋅T−2 or M⋅L−1⋅T−3 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 Me,λ[nb 4] watt per square metre per hertz or watt per square metre, per metre W⋅m−2⋅Hz−1 or W/m3 M⋅T−2 or M⋅L−1⋅T−3 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 He,λ[nb 4] joule per square metre per hertz or joule per square metre, per metre J⋅m−2⋅Hz−1 or J/m3 M⋅T−1 or M⋅L−1⋅T−2 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 ελ 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 εΩ,λ 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 Aλ 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 AΩ,λ 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 Rλ 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 RΩ,λ 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 Tλ 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 TΩ,λ 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 μλ 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 μΩ,λ 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 ↑ Standards organizations recommend that radiometric quantities should be denoted with suffix "e" (for "energetic") to avoid confusion with photometric or photon quantities. ↑ 2.0 2.1 2.2 2.3 2.4 Alternative symbols sometimes seen: W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Spectral quantities given per unit frequency are denoted with suffix "ν" (Greek)—not to be confused with suffix "v" (for "visual") indicating a photometric quantity. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Spectral quantities given per unit wavelength are denoted with suffix "λ" (Greek). ↑ 5.0 5.1 Directional quantities are denoted with suffix "Ω" (Greek).

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