Measurement of soot morphology by integrated LII and elastic light scattering

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Journal titleApplied Physics B: Lasers and Optics
Pages385397; # of pages: 13
Subject532 nm laser; Aggregate size; Aggregation theory; Detection angle; Elastic light scattering; Experimental setup; Laser fluences; Laser induced incandescence; Log-normal; Polydisperses; Radius of gyration; Scattering measurements; Soot aggregates; Distribution functions; Optical properties; Polydispersity; Refraction; Scattering; Soot; Transmission electron microscopy; Light scattering
AbstractA compact experimental setup that integrates laser-induced incandescence (LII) and one-angle elastic light scattering (1A-ELS) to measure the size of polydisperse soot aggregates is described. A 532 nm laser and a detection angle of 35 degrees were employed, which provided sensitivity for aggregate radius of gyrations (R g) of R g 200 nm. Both lognormal and self-preserving distribution functions are compared with width parameters derived from both aggregation theory and transmission electron microscopy (TEM) measurements. Using these distributions, mean aggregate sizes derived from the scattering measurements are compared. The LII+1A-ELS technique is validated with a two-angle elastic light scattering (2A-ELS) approach with an additional detection angle at 145 deg. Unlike LII+1A-ELS, the 2A-ELS technique has the advantage of not requiring knowledge of soot optical properties. Good agreement is found between the two techniques for a given distribution. A fundamental discrepancy exists between distributions derived from TEM and those according to aggregation theory, limiting the accuracy of both 2A-ELS and LII+1A-ELS. The dependence of both techniques on laser fluence and hence soot temperature is examined and discussed. © 2011 Her Majesty the Queen in Right of Canada.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271315
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Record identifierfd4b6f14-0672-45b9-84b5-cb6cc297d434
Record created2014-03-24
Record modified2016-05-09
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