1	Infrared Remote Sensing Nick Faust GTRI/EOSL 404-894-0021 Nick.faust@gtri.gatech.edu http://rst.gsfc.nasa.gov/Sect9/Sect9_1.html
2	Basic Theory All objects warmer than Absolute Zero emit energy Sun approximates 6000 Degree K Black Body Earth approximates a 300 Degree K Black Body Amount of energy emitted by an Object is proportional to its Temperature M(wavelength) = sigma* T4 Sigma = Stefan-Boltzmann const (5.6697 x 10(-8)Watts)
3	Black Body Definition Black Body Absorbs all incident radiation focused on it Radiates energy at maximum possible rate/unit area at each wavelength for any given temperature ( Mulligan 1980) No objects are perfect Black Bodies (approximations)
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6	Emissivity Physical Characterstic of Objects E = Mo(radiant flux of object)/Mb (radiant flux of blackbody) Emissivity nearly independent of Temperature
7	Sources of Thermal Energy Solar Thermal energy Solar Visible/NearIR (absorbed and reradiated at thermal wavelengths) Radioactive decay (earth – uranium, etc) Fires Manmade sources (Power plants, engines, etc)
8	Diurnal Thermal Effects
9	Thermal Diurnal Effects
10	Atlanta day/night
11	Kilauea Volcano Lava Flow
12	Urban Heat Loss
13	Geologic Discrimination
14	Lava Flow Discrimination
15	Obstacles to Interpretation of Thermal Imagery Changes radically throughout the day Unknown emissivity of subject Different set of detectors that often require cooling near absolute zero (nitrogen, etc)
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