2.关键术语 2.1.1.10 Planck's Law Planck's law describes the spectral distribution of the radiation from a blackbody as (Planck 1914) B(T)= C (2.11) λ5[exp(号)-1] where Ba(T)is the spectral radiance [W m2 um sr]of a blackbody at temperature T [K]and wavelength A [um];Ci and C2 are the physical constants (C1=1.191×108Wum4sr-1m2,C2=1.439×104um.K). 2.1.1.11 Stefan-Boltzmann's Law Integrating the emitted radiance over the whole spectrum gives an expression for the total flux emitted by an isotropic blackbody of unit area.This is known as the Stefan-Boltzmann's law (Stefan 1879;Boltzmann 1884): M(T)=元。B(T)=aT4 (2.12) where M is the emitted radiant exitance,and o is the Stefan-Boltzmann constant (o=5.67×10-8Wm-2K-4)