05-Thermal

05-Thermal - 4/21/2008 ESM 266: Infrared remote sensing 1...

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Unformatted text preview: 4/21/2008 ESM 266: Infrared remote sensing 1 ESM 266: ESM 266: Thermal infrared Thermal infrared remote remote sensing sensing (Wikipedia Infrared ) Infrared remote sensing, to measure Infrared remote sensing, to measure Surface temperature, through the atmosphere Atmospheric sounding 3 Temperature and humidity Trace gas concentrations Radiation balance Emissivity Antenna on roof of Ellison Hall http://www.icess.ucsb.edu/ and follow link to DATA->AVHRR Images AVHRR AVHRR (NOAAs operational (NOAAs operational meteorological sensor) meteorological sensor) 4 Fusion between data on ocean temperature Fusion between data on ocean temperature and surface height and surface height TeraScan calibrate, de-cloud, aggregate extrapolate SST grid SST super data AVHRR image HRPT downlink HRPT Data Handling HRPT Gridding SST SST u t + CD-ROM extrapolate calibrate, aggregate MGDR cracker ocean height super data ocean height grid TOPEX points GOAL : Local and advective components of upper ocean heat balance: TOPEX Gridding TOPEX Data Handling Radiation principles Radiation principles All bodies radiate Hotter bodies radiate more at all wavelengths 6 Radiation from a hotter body peaks at a shorter wavelength than from a cooler body 4/21/2008 ESM 266: Infrared remote sensing 2 Governing equation Governing equation ( ) 2 5 2 , where 1 x hc hc L x k T e = = Plancks equation (spectral curves on next slide) 7 c speed of light 3.00 10 8 ms 1 h Plancks constant 6.63 10 34 Js k Boltzmanns constant 1.38 10 23 JK 1 Stefan-Boltzmann constant 5.67 10 8 Wm 2 K 4 Stefan-Boltzmann equation 4 E L d T = = Definition of IR regions Definition of IR regions 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Sun (5800K) Scaled for Earth-Sun distance Earth (288K) 8 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 0.1 1 10 100 wavelength (m) radiance NIR SWIR Mid IR Thermal IR Atmospheric Atmospheric transmission of infrared transmission of infrared radiation radiation 9 http://www.pentec.com/instrumentation.htm Infrared spectral regions Infrared spectral regions attributes disadvantages 3.54.5 m (Mid IR) Clearest atmospheric...
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This note was uploaded on 08/06/2008 for the course ESM 266 taught by Professor Dozier during the Spring '08 term at UCSB.

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05-Thermal - 4/21/2008 ESM 266: Infrared remote sensing 1...

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