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 :
This defines a monochromatic luminanceLλ (O, Δ, λ ) (in W · m–3·...
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Fundamental law of thermal radiation: Planck's law. The black body
Radiative properties of opaque materials
References
- (1) - KRIEBEL (K.T.) - On the limited validity of reciprocity in measured BRDFs. - Remote Sensing of Environment, 58, 1, p. 52-62, oct. 1996.
- (2) - MALAPLATE (A.), NERRY (F.), STOLL (M.P.), GUILLAME (B.), BRIOTTET (X.) - Combined field [3-5 µm] and [8-14 µm] infrared imaging : approaches to extracting target's...
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