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05-Thermal - ESM 266 Thermal infrared remote...

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ESM 266: Thermal infrared  ESM 266: Thermal infrared  remote sensing remote sensing
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(Wikipedia – Infrared )
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3 Infrared remote sensing, to measure … Infrared remote sensing, to measure … Surface temperature, through the atmosphere Atmospheric sounding Temperature and humidity Trace gas concentrations Radiation balance Emissivity
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4 Antenna on roof of Ellison Hall http://www.icess.ucsb.edu/ and follow link to DATA->AVHRR Images AVHRR AVHRR  (NOAA’s operational meteorological   (NOAA’s operational meteorological  sensor) sensor)
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SST SST u t T T T + �� Fusion between data on ocean temperature and  Fusion between data on ocean temperature and  surface height surface height CD-ROM TeraScan calibrate, de-cloud, aggregate extrapolate SST grid SST “super data” AVHRR image HRPT downlink extrapolate calibrate, aggregate MGDR cracker ocean height “super data” ocean height grid TOPEX points GOAL : Local and advective components of upper ocean heat balance: HRPT Data Handling HRPT Gridding TOPEX Gridding TOPEX Data Handling
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6 Radiation principles Radiation principles All bodies radiate Hotter bodies radiate more at all wavelengths Radiation from a hotter body peaks at a shorter wavelength than from a cooler body
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7 Governing equation Governing equation c speed of light 3.00 × 10 8 ms –1 h Planck’s constant 6.63 × 10 –34 Js k Boltzmann’s constant 1.38 × 10 –23 JK –1 σ Stefan-Boltzmann constant 5.67 × 10 –8 Wm –2 K –4 ( 29 2 5 2 , where 1 x hc hc L x k T e λ λ λ = = - Planck’s equation  (spectral curves on  next slide) Stefan-Boltzmann  equation 4 0 E L d T λ π λ σ = =
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8 Definition of IR regions Definition of IR regions 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 0.1 1 10 100 wavelength (µm) radiance Sun (5800K) Scaled for Earth-Sun distance Earth (288K) NIR SWIR Mid IR Thermal IR
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9 Atmospheric transmission of infrared radiation Atmospheric transmission of infrared radiation http://www.pentec.com/instrumentation.htm
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10 Infrared spectral regions Infrared spectral regions   attributes  disadvantages  3.5–4.5  μ (Mid IR) 
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