A new method to determine the arbitrary electron energy distribution function (EEDF) from the optical emission spectroscopic measurement in atmospheric-pressure plasma is introduced. The optical emission spectroscopy (OES) continuum emission spectrum, dominated by electron-neutral bremsstrahlung radiation, is analyzed to inspect the usefulness of the conventional OES measurement range for EEDF determination. The EEDF is reconstructed from the OES continuum radiation spectrum by applying machine learning to solve the bremsstrahlung emissivity equation inversely. Through iterative statistical analysis, the presented genetic algorithm can locate the EEDF reliably. Verification of the algorithm shows that theoretical Maxwellian and Druyvesteynian EEDFs can be partially reconstructed from a realistic OES measurement range. Furthermore, preliminary experimental EEDF results of an argon dielectric barrier discharge (DBD) OES measurement are given. The electron energy range and resolution of the determined EEDF are discussed. The results in this paper show potential for accurate determination of the arbitrary EEDF in atmospheric-pressure plasma using simple OES equipment.
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March 2021
Research Article|
March 17 2021
Arbitrary EEDF determination of atmospheric-pressure plasma by applying machine learning to OES measurement
Thijs van der Gaag
;
Thijs van der Gaag
a)
Tokyo Institute of Technology
, 2-12-1-N1-10 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
a)Author to whom correspondence should be addressed: van.t.ab@m.titech.ac.jp
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Hiroshi Onishi;
Hiroshi Onishi
Tokyo Institute of Technology
, 2-12-1-N1-10 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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Hiroshi Akatsuka
Hiroshi Akatsuka
Tokyo Institute of Technology
, 2-12-1-N1-10 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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a)Author to whom correspondence should be addressed: van.t.ab@m.titech.ac.jp
Phys. Plasmas 28, 033511 (2021)
Article history
Received:
August 05 2020
Accepted:
February 26 2021
Citation
Thijs van der Gaag, Hiroshi Onishi, Hiroshi Akatsuka; Arbitrary EEDF determination of atmospheric-pressure plasma by applying machine learning to OES measurement. Phys. Plasmas 1 March 2021; 28 (3): 033511. https://doi.org/10.1063/5.0023928
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