caa a22 4500 445370289 CHVBK 20180317142944.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s00340-011-4432-4 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4432-4 Constraints of two-colour TiRe-LII at elevated pressures [Elektronische Daten] [M. Charwath, R. Suntz, H. Bockhorn] The main objective of this work is to investigate the influence of high-pressure conditions on the determination of primary particle size distributions of laser-heated soot particles using pyrometrically determined temperature decays. The method is based on time-resolved laser-induced incandescence measurements carried out at two different wavelengths (two-colour TiRe-LII). The LII signals are transferred into a particle ensemble averaged (effective) temperature using Planck's thermal radiation formula. Assuming that all particles within the size distribution possess a unique temperature at the end of the laser pulse, the size distribution can be determined by numerically simulating the measured temperature decay. From our investigations, for pressures up to a few bars it is obvious that this strategy can be successfully applied if standard laser pulses of nano-second duration are used as an LII-excitation source. At higher pressures the time scales of heat conduction are decreased to such an extent that a unique temperature for all particles within the ensemble cannot be assumed at the end of the nano-second laser pulse. However, further investigations show that the presented two-colour TiRe-LII technique can be successfully adopted under technical high-pressure conditions as well, if the pulse duration of the TiRe-LII-excitation source is reduced into the pico-second range. Springer-Verlag, 2011 Charwath M. Engler-Bunte-Institut, Bereich Verbrennungstechnik, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut Suntz R. Institut für Technische Chemie und Polymerchemie, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut Bockhorn H. Engler-Bunte-Institut, Bereich Verbrennungstechnik, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut Applied Physics B Springer-Verlag 104/2(2011-08-01), 427-438 0946-2171 104:2<427 2011 104 340 https://doi.org/10.1007/s00340-011-4432-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4432-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Charwath M. Engler-Bunte-Institut, Bereich Verbrennungstechnik, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut NATIONALLICENCE 700 1- Suntz R. Institut für Technische Chemie und Polymerchemie, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut NATIONALLICENCE 700 1- Bockhorn H. Engler-Bunte-Institut, Bereich Verbrennungstechnik, Karlsruher Institut für Technologie, Kaiserstr. 12, 76131, Karlsruhe, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/2(2011-08-01), 427-438 0946-2171 104:2<427 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer