Template:Radiometry coefficients

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Radiometry coefficients
Quantity SI units Notes
Name Sym.
Hemispherical emissivity ε — Radiant exitance of a surface, divided by that of a black body at the same temperature as that surface.
Spectral hemispherical emissivity εν
ελ 		— Spectral exitance of a surface, divided by that of a black body at the same temperature as that surface.
Directional emissivity εΩ — 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
εΩ,λ 		— Spectral radiance emitted by a surface, divided by that of a black body at the same temperature as that surface.
Hemispherical absorptance A — Radiant flux absorbed by a surface, divided by that received by that surface. This should not be confused with "absorbance".
Spectral hemispherical absorptance Aν
Aλ 		— Spectral flux absorbed by a surface, divided by that received by that surface. This should not be confused with "spectral absorbance".
Directional absorptance AΩ — 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
AΩ,λ 		— 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 — Radiant flux reflected by a surface, divided by that received by that surface.
Spectral hemispherical reflectance Rν
Rλ 		— Spectral flux reflected by a surface, divided by that received by that surface.
Directional reflectance RΩ — Radiance reflected by a surface, divided by that received by that surface.
Spectral directional reflectance RΩ,ν
RΩ,λ 		— Spectral radiance reflected by a surface, divided by that received by that surface.
Hemispherical transmittance T — Radiant flux transmitted by a surface, divided by that received by that surface.
Spectral hemispherical transmittance Tν
Tλ 		— Spectral flux transmitted by a surface, divided by that received by that surface.
Directional transmittance TΩ — Radiance transmitted by a surface, divided by that received by that surface.
Spectral directional transmittance TΩ,ν
TΩ,λ 		— Spectral radiance transmitted by a surface, divided by that received by that surface.
Hemispherical attenuation coefficient μ m−1 Radiant flux absorbed and scattered by a volume per unit length, divided by that received by that volume.
Spectral hemispherical attenuation coefficient μν
μλ 		m−1 Spectral radiant flux absorbed and scattered by a volume per unit length, divided by that received by that volume.
Directional attenuation coefficient μΩ m−1 Radiance absorbed and scattered by a volume per unit length, divided by that received by that volume.
Spectral directional attenuation coefficient μΩ,ν
μΩ,λ 		m−1 Spectral radiance absorbed and scattered by a volume per unit length, divided by that received by that volume.
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