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Title
Japanese: 
English:Diagnosis of electron temperature and density of helium atmospheric-pressure plasma jet by using line intensity ratio 
Author
Japanese: 田口智也, 菊地航行, 榎本純, 赤塚洋.  
English: Tomoya Taguchi, Wataru Kikuchi, Jun Enomoto, Hiroshi Akatsuka.  
Language English 
Journal/Book name
Japanese: 
English:Bull. American Phys. Soc. 
Volume, Number, Page        
Published date Oct. 13, 2025 
Publisher
Japanese: 
English:Americal Physical Society 
Conference name
Japanese: 
English:The 78th Annual Gaseous Electronics Conference (GEC2025) 
Conference site
Japanese:ソウル 
English:Seoul 
Official URL https://schedule.aps.org/gec/2025/events/DW5/21
 
Abstract Atmospheric-pressure plasma jet (APPJ) has attracted much attention because it has been expected to be applied in medical and dental fields. However, it was hard to determine the electron temperature and density in non-equilibrium plasma such as APPJ, so they have not been treated correctly. In this study, helium excited-level number density is obtained by integration of two methods, which are optical emission spectroscopy (OES) measurement, and helium collisional-radiative model (CR model); In OES, helium line intensity can be measured, which leads to extract excited-level number densities, while in the CR model, theoretical excited-level number densities are obtained by assuming electron temperature and density as input parameters. Then, some ratios of excited-level number densities in different levels are calculated. Finally, the discrepancy of the ratios is minimized to diagnose the electron temperature and density in the He APPJ.

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