CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely...

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CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL AGGREGATES

Transcript of CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely...

Page 1: CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely polydisperse. Backscatter apparatus likely works, but needs more testing. FINAL

CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL

AGGREGATES

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WHY?

[1]

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THE SOURCE

Spherical Liquid Water Droplet Aerosol (m=1.33)

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BACKSCATTER SETUP

Laser (λ= 633nm)

CCD Detector

Aerosol Target

Beam splitter

Beam Dump

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Angle (˚)

Inte

nsity

(arb

itrar

y un

its) RESULTS

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Mie ripples, but polydispersity wipes them out

Guinier regime: θ~λ/(πd)

SIZING: FORWARD SCATTERING

Laser (λ= 633nm)

CCD Detector

Polarizers Lens

Iris

Aerosol Target

Mirror

Page 7: CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely polydisperse. Backscatter apparatus likely works, but needs more testing. FINAL
Page 8: CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely polydisperse. Backscatter apparatus likely works, but needs more testing. FINAL

RESULTS

Page 9: CALIBRATING FOR LIGHT BACKSCATTER FROM FRACTAL …DLS suggests mid-range size: ~2.5-4µm Very likely polydisperse. Backscatter apparatus likely works, but needs more testing. FINAL

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.

FINAL RESULTS

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[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.

REFERENCE


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Calibrating for Light backscatter from fractal aggregates

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