Optical properties of pulsed laser heated soot

  1. Get@NRC: Optical properties of pulsed laser heated soot (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s00340-011-4449-8
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for:
Journal titleApplied Physics B: Lasers and Optics
Pages307319; # of pages: 13
Subject1064 nm; Elastic light scattering; Exhaust plumes; Extinction measurements; Fluences; Laser fluences; Laser induced incandescence; Light scattering measurement; Material loss; Soot aggregates; Structure factors; Temperature dependent; Time-periods; Time-resolved; Transient changes; Desorption; Dust; Heating; Laser heating; Light extinction; Light scattering; Refraction; Refractive index; Scattering; Soot; Pulsed lasers
AbstractTo investigate the transient change of soot optical properties resulting from pulsed laser heating of soot in a cooled exhaust plume we have simultaneously performed cw light extinction at 405 and 830 nm and elastic light scattering at 1064 nm. A reversible increase to the 830-nm light extinction of up to 7%, observed during the time period where the soot was hot, suggests a temperature-dependent light absorption refractive index function, E(m λ ). At low fluence, small permanent increases of E(m λ ) of <2% were also observed. 405-nm extinction measurements revealed that the soot likely contained material which continued to absorb 405-nm radiation when desorbed, thus complicating measurement interpretation. 1064-nm light scattering measurements showed a gradual decrease of scattering propensity with increasing laser fluence up to the point of material loss, which is consistent with the expected decrease of the structure factor of the soot aggregates as they expand. It is concluded that variations of the optical properties are occurring at the time of laser-induced incandescence (LII) emission, which should be accounted for in time-resolved LII measurement interpretation. © 2011 Her Majesty the Queen in Right of Canada.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271767
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Record identifier6ec7a0f1-1c22-4edc-ab8f-8de1ac035e66
Record created2014-03-24
Record modified2016-05-09
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