4 May 2015 Extinction characterization of soot produced by laser ablating carbon fiber composite materials in air flow
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Proceedings Volume 9543, Third International Symposium on Laser Interaction with Matter; 954305 (2015) https://doi.org/10.1117/12.2178229
Event: Third International Symposium on Laser Interaction with Matter, 2014, Jiangsu, China
Abstract
In order to research the dynamic process of energy coupling between an incident laser and a carbon fiber/epoxy resin composite material, an extinction characterization analysis of soot, which is produced by laser ablating and located in an air flow that is tangential to the surface of the composite material, is carried out. By the theory analyses, a relationship of mass extinction coefficient and extinction cross section of the soot is derived. It is obtained that the mass extinction coefficients of soot aggregates are the same as those of the primary particles when they contain only a few primary particles. This conclusion is significant when the soot is located in an air flow field, where the generations of the big soot aggregates are suppressed. A verification experiment is designed. The experiment employs Laser Induced Incandescence technology and laser extinction method for the soot synchronization diagnosis. It can derive a temporal curve of the mass extinction coefficient from the soot concentration and laser transmittance. The experiment results show that the mass extinction coefficient becomes smaller when the air flow velocity is higher. The reason is due to the decrease of the scatter effects of the soot particles. The experiment results agree with the theory analysis conclusion.
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Weiping Liu, Zhiliang Ma, Zhenrong Zhang, Menglian Zhou, Chenghua Wei, "Extinction characterization of soot produced by laser ablating carbon fiber composite materials in air flow", Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 954305 (4 May 2015); doi: 10.1117/12.2178229; https://doi.org/10.1117/12.2178229
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