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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer Berlin Heidelberg

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ISSN

1432-0649

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Influence of rapid laser heating on the optical pr

Authors: M Saffaripour KP Geigle D R Snelling G J Smallwood K A Thomson
Publish Date: 2015/03/28
Volume: 119, Issue: 4, Pages: 621-642
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Abstract

To understand the effect of rapid heating on the optical properties of inflame soot and its potential influence on the laserinduced incandescence LII signal the timeresolved extinction coefficient of soot is measured in diffusion and premixed flames during laser heating Heating is performed using a 1064nm pulsed laser with fluences ranging from 02 to 62 mJ/mm2 Extinction measurements are carried out using continuouswave lasers at four different wavelengths A rapid enhancement of extinction by up to 10  in the diffusion flame and 18  in the premixed flame occurs during laser heating most likely as a result of temperaturedependent optical properties and laserinduced thermal annealing of soot The thermal expansion of flame gases causes a gradual decline of soot concentration for about 2 μs after the laser pulse Significant loss of soot material by sublimation is observed at fluences as low as 103 and 206 mJ/mm2 for the diffusion and premixed flames respectively A secondary rise in extinction coefficient is observed from about 50 to 800 ns after the laser pulse at low monitoring wavelengths attributed to the formation of lightabsorbing gaseous species from the sublimated soot material These effects may impact the LII signal and should be accounted for in LII analysis

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