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Calibrating for Light backscatter from fractal aggregates

Calibrating for Light backscatter from fractal aggregates. Why?. [1]. The source. Spherical Liquid Water Droplet Aerosol (m=1.33). Backscatter Setup. CCD Detector. Laser ( λ = 633nm). Aerosol Target. Beam splitter. Beam Dump. Results. Intensity (arbitrary units). Angle (˚).

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Calibrating for Light backscatter from fractal aggregates

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  1. Calibrating for Light backscatter from fractal aggregates

  2. Why? [1]

  3. The source Spherical Liquid Water Droplet Aerosol (m=1.33)

  4. Backscatter Setup CCD Detector Laser (λ= 633nm) Aerosol Target Beam splitter Beam Dump

  5. Results Intensity (arbitrary units) Angle (˚)

  6. Sizing: forward scattering • Mie ripples, but polydispersity wipes them out • Guinier regime: θ~λ/(πd) CCD Detector Laser (λ= 633nm) Mirror Aerosol Target Lens Polarizers Iris

  7. Results

  8. Final Results • Backscatter suggests smaller size: ~1.5µm • Forward scattering suggests bigger size: ~6µm • DLS suggests mid-range size: ~2.5-4µm • Very likely polydisperse. • Backscatter apparatus likely works, but needs more testing.

  9. Reference • [1]"Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, 2007." IPCC - Intergovernmental Panel on Climate Change. Ed. S. Soloman, D. Qin, M.Manning, and Z. Chen. Internation Panel on Climate Change. Web. 09 Nov. 2011.

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