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Spectroscopic and Photographic Evaluation of the Near-Surface Layer Produced by Arc-Induced Polymer Ablation
KTH, School of Electrical Engineering and Computer Science (EECS).
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.ORCID iD: 0000-0002-6375-6142
Leibniz Inst Plasma Sci & Technol, D-17489 Greifswald, Germany..
Leibniz Inst Plasma Sci & Technol, D-17489 Greifswald, Germany..
2019 (English)In: IEEE Transactions on Plasma Science, ISSN 0093-3813, E-ISSN 1939-9375, Vol. 47, no 4, p. 1851-1858Article in journal (Refereed) Published
Abstract [en]

High-intensity plasmas can release material from the surface of polymers by a process known as arc-induced ablation. As consequence, the formation of a near-surface layer of polymeric vapor is generally assumed. In order to investigate the near-surface layer formed by the ablation of polyoxymethylene, high-speed photography and space-resolved optical emission spectroscopy are used. Transient arc plasmas generated under a 1.9-kA, 50-Hz current semicycle are used as ablation source in air. It is found that the near-surface ablation layer strongly scatters radiation emitted by the arc core. This effect is caused by light scattering of micrometer-size fragments released by the ablating polymer. This finding shows that the near-surface layer is not only composed of vapor but also contains a significant density of large-sized polymer fragments. These fragments are formed a few milliseconds after the ignition of the arc plasma, and their density rapidly decreases with the distance to the surface.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 47, no 4, p. 1851-1858
Keywords [en]
Arc plasma, optical emission spectroscopy, polymer ablation, scattering, vapor layer
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-249795DOI: 10.1109/TPS.2019.2898632ISI: 000463470900021Scopus ID: 2-s2.0-85063935077OAI: oai:DiVA.org:kth-249795DiVA, id: diva2:1306621
Note

QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-08-30Bibliographically approved

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Pettersson, JonasBecerra Garcia, Marley

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