caa a22 4500 445370351 CHVBK 20180317142944.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s00340-011-4449-8 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4449-8 Optical properties of pulsed laser heated soot [Elektronische Daten] [K. Thomson, K. Geigle, M. Köhler, G. Smallwood, D. Snelling] To 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 830nm and elastic light scattering at 1064nm. Areversible increase to the 830-nm light extinction of up to7%, 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. Her Majesty the Queen in Right of Canada, 2011 Thomson K. National Research Council of Canada (NRC), Ottawa, Canada aut Geigle K. German Aerospace Centre (DLR), Stuttgart, Germany aut Köhler M. German Aerospace Centre (DLR), Stuttgart, Germany aut Smallwood G. National Research Council of Canada (NRC), Ottawa, Canada aut Snelling D. National Research Council of Canada (NRC), Ottawa, Canada aut Applied Physics B Springer-Verlag 104/2(2011-08-01), 307-319 0946-2171 104:2<307 2011 104 340 https://doi.org/10.1007/s00340-011-4449-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4449-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Thomson K. National Research Council of Canada (NRC), Ottawa, Canada aut NATIONALLICENCE 700 1- Geigle K. German Aerospace Centre (DLR), Stuttgart, Germany aut NATIONALLICENCE 700 1- Köhler M. German Aerospace Centre (DLR), Stuttgart, Germany aut NATIONALLICENCE 700 1- Smallwood G. National Research Council of Canada (NRC), Ottawa, Canada aut NATIONALLICENCE 700 1- Snelling D. National Research Council of Canada (NRC), Ottawa, Canada aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/2(2011-08-01), 307-319 0946-2171 104:2<307 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer