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# T4-Radiation Principles_2010_v1_3slides - Geography 333...

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1 Geography 333 Remote Sensing I Topic 4: Electromagnetic Radiation Principles 2 Readings Chapter 2 (sensors) Chapter 6 (Radiation Principles) Next Topic: Chapter 8 – Image Enhancements (Geometric Corrections) 3 Outline The Physics of “Light” Particle and wave theory Wavelength and frequency EMR spectrum Black bodies EMR interactions Refraction Scattering Absorption Reflectance Reflection patterns Spectral reflectance curves Reflectance and reality

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2 4 The Physics of “Light” Electromagnetic Radiation (EMR) is the engine that drives remote sensing EMR can be observed as both a wave in motion (wave theory of light) or as single discrete packets (photons) 5 Particle Theory of Light EMR is the energy released when an electrically-charged electron moves from an excited state to a de-excited state 6 Electromagnetic Radiation (EMR) Electric and magnetic fields fluctuate orthogonally, perpendicular to the direction of travel Travels through space at 3x10 8 m/s (299,792,458 m/s) Emitted by all objects above –273 degrees C (0 Kelvin)
3 7 Wavelength and Frequency Wavelength Distance between successive crests (troughs) of a wave form Usually measured in micrometers ( μ m) or nanometers (nm) Frequency The number of crests that pass a point per unit time (one second) Usually measured in megahertz (MHz) or gigahertz (GHz) 8 The Relationship Between Wavelength and Frequency Wavelength and frequency are related by the following formula: c = v , = c/v, and v = c/ (e.g.: 12 = 3 x 4) c is the speed of light is wavelength v is frequency 9 Particle & Wave Theory EMR is transferred in discrete packets (photons or quanta) Moves as a wave, with frequency inverse to wavelength Relationship between frequency & quanta is: Where Q = energy of photon (Joules) v = frequency of radiation h = Planck constant Energy is directly proportional to frequency High frequency (i.e., gamma rays, x-rays etc), high energy Q = hv

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