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Saturation curves of two-color laser-induced incandescence measurements for the investigation of soot optical properties

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Abstract

Two-color laser-induced incandescence (LII) measurements are carried out in diffusion flames and at the exhaust of a homemade soot generator, both fueled with ethylene and methane. Two-color prompt LII signals, their ratio and the corresponding temperature have been analyzed as a function of laser fluence. In particular, the effect of fuel, soot load and gas/particle initial temperature on LII measurements have been investigated. LII spectral measurements have also been performed in all conditions for validation. The results suggest that the incandescence is sensitive to both optical and non-optical physical properties of the particles. Moreover, soot volume fraction measurements are dependent on the laser fluence used, indicating that the soot temperature influences the refractive index absorption function. Such issues can be overcome by working at high laser fluences, where the saturation curves are independent from the experimental conditions if the soot absorption function near soot sublimation threshold is known.

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Acknowledgments

The authors acknowledge the financial support provided by INTEGRATE project in the framework of CNR-Regione Lombardia program. The authors wish to thank Mr. E. Fantin for his technical support.

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Correspondence to S. De Iuliis.

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Migliorini, F., De Iuliis, S., Maffi, S. et al. Saturation curves of two-color laser-induced incandescence measurements for the investigation of soot optical properties. Appl. Phys. B 120, 417–427 (2015). https://doi.org/10.1007/s00340-015-6151-8

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  • DOI: https://doi.org/10.1007/s00340-015-6151-8

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