CEE 4221 Lecture 7: Lect. 7
6 Apr 2016
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Document Summary
blackbody : a hypothetical, ideal radiator that absorbs and re-emits the entire energy incident upon it. spectral distribution or spectral curve : energy distribution over different wavelengths for different temperature. peak of the radiant exitance varies with wavelength. with increase in temperature, the peak shifts towards left. dominant wavelength at which a black body radiates m is inversely proportional to the absolute temperature of the black body (in k) In the spectral curve at 6000k visible part of the energy (0. 4-0. 7 m) dominates. selective wavelength bands are used in remote sensing. electromagnetic energy interacts with the atmospheric gases and particles. Atmosphere absorbs / backscatters a fraction of the energy and transmits the remainder. atmospheric windows : wavelength regions through which most of the energy is transmitted through atmosphere.
