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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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DOI

10.1002/pro.5560020905

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ISSN

1432-0649

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Combination of LII and extinction measurements for

Authors: M Leschowski K A Thomson D R Snelling C Schulz G J Smallwood
Publish Date: 2015/04/08
Volume: 119, Issue: 4, Pages: 685-696
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Abstract

The measurement of soot and soot precursors is important for understanding the formation of soot particles in flames In this paper we use the difference between laserinduced incandescence LII and twodimensional extinction measurements to assess the contribution of soot precursors to the extinction measurement LII measurements are performed with a high spatial resolution of 100 µm to determine the soot volume fraction f V in a laminar ethylene/air nonpremixed flame at the standard Gülder conditions While LII is specific to mature soot only the extinction data represent attenuation due to mature and young soot absorption and elastic scattering and also absorption by soot precursors The difference between the two measurements indicates the contribution of soot precursors and allows a determination of the maturity of soot This is important knowledge for those using extinction techniques to measure soot concentration as the contribution from soot precursors may lead to an overestimation of the mature soot concentration Further regions with high sootprecursor concentrations which lead to soot formation can be identifiedThe authors thank P Desgroux for helpful discussion about the interpretation of nonsoot absorbance and D Clavel for the thorough support of setup experiments and analysis Financial support by German Research Foundation DFG SCHU1369/3 NRCan PERD Project AFTER11 is gratefully acknowledged

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