calibrating for light backscatter from fractal …dls suggests mid-range size: ~2.5-4µm very likely...
TRANSCRIPT
![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](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9d4dd1ad7e56358597b68/html5/thumbnails/1.jpg)
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
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RESULTS
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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
![Page 10: 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](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9d4dd1ad7e56358597b68/html5/thumbnails/10.jpg)
[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