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Lecture 6: Thermal Radiation

Satellite Remote SensingSIO 135/SIO 236 Lecture 6: Thermal RadiationHelen Amanda FrickerHow is EMR generated?Radio frequency generated by periodic currents of electric charges generated by electron tubes that use the motion of highspeed electrons in specially designed structure to generate E/B fieldswhich is than guided by a wavegarde to Radiation structureVisible high frequency wave in the infrared and visible are generated bymolecular excitation (vibrational or orbital) followed by decay. Theemitted frequency is exactly related to the energy difference betweenthe 2 energy level of the kinetic energy of random motion of particles of matter. The randommotion results in excitation (electronic, vibrational, rotational) due tocollisions followed by random emission of EM wave during the of its random nature this type of energy transformation leadsto emission over a wide spectral (LRadiance (L!))

¥ Thermal radiation is emitted by all objects above absolute zero ¥ In many cases the spectrum of this radiation (i.e. intensity vs wavelength) follows the idealized black-body radiation curve Stefan-Boltzmann law: Total energy emitted over time by a black body is proportional to T4 Wiens displacement law: The wavelength

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Transcription of Lecture 6: Thermal Radiation

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