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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.

3.Thermal infrared: emitted, can only be detected using electro-optical sensors (3.0 - 5.0 and 8 - 14 µm). Microwave Radar sensors, wavelengths range from 1mm - 1m (Ka, Ku, X, C, S, L & P) Spectral bands Three important spectral bands in remote sensing: ¥visible light ¥infrared radiation ¥microwave radiation Image from NASA 1987.

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