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Polarization

Polarization. Ben Kravitz Thursday, September 10, 2009. 2. Outline. What polarization is How it works How it is useful to remote sensing. Orientation. http://www.colorado.edu/physics/2000/polarization/polarizationII.html. Ray direction remains the same. Polarization.

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Polarization

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  1. Polarization • Ben Kravitz • Thursday, September 10, 2009

  2. 2 Outline • What polarization is • How it works • How it is useful to remote sensing

  3. Orientation http://www.colorado.edu/physics/2000/polarization/polarizationII.html Ray direction remains the same

  4. Polarization http://www.colorado.edu/physics/2000/polarization/images/typicalLIght.jpg Polarized Light Typical Light http://www.colorado.edu/physics/2000/polarization/images/polarizeLight.jpg

  5. Orientation (again) Recall that, no matter which way the ray is oriented, we can break up the light ray vector into its horizontal and vertical components

  6. Polarizing Filters http://www.colorado.edu/physics/2000/polarization/polarizationII.html

  7. Examples http://www.colorado.edu/physics/2000/polarization/blocking_light.html http://www.colorado.edu/physics/2000/polarization/twisting_light.html

  8. Uses of Polarization • Satellite transmission (multiple channels per frequency) • Minimize interference • Different responses by surfaces to different polarizations

  9. Polarization and Remote Sensing http://www.ccrs.nrcan.gc.ca/glossary/index_e.php?id=2818 Different orientations are scattered in different ways

  10. Linear Polarization • Vertical Transmit, Vertical Receive (VV) - scattering due to surface capillary waves has a higher signal-to-noise ratio for this polarization, commonly used in oceanography for extracting surface wind speeds • Horizontal Transmit, Horizontal Receive (HH) - studying soil moisture (horizontally polarized waves pass through vegetation into the soil below), good for separating ice from water, good for ship detection • Horizontal Transmit, Vertical Receive (HV) - retrieval depends on the scattering mechanism, so good for differentiating different types of materials or structures • Vertical Transmit, Horizontal Receive (VH) - same as HV, but receiver noise is different, so this is averaged with HV to get a less noisy measurement

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