1. Fundamental law of thermal radiation: Planck's law. The black body
1.1 Definition of luminance
Consider an elementary surface of area dS around a point O (figure
1
) a straight line Δ passing through O making an angle θ with the normal ON to the surface, and the elementary solid angle dΩ (in sr) of axis Δ. The radiative flux d Φ (in W) in the wavelength interval between λ and λ + d λ, propagating to or from dS, within d Ω is written :
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Fundamental law of thermal radiation: Planck's law. The black body
Radiative properties of opaque materials
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