Calibrating for Light backscatter from fractal aggregates

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Presentation transcript:

Calibrating for Light backscatter from fractal aggregates

Why? [1]

Spherical Liquid Water Droplet Aerosol (m=1.33) 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 (˚)

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

Results

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.

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.