| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Non-uniform electron density estimation based on electromagnetic wave attenuation in plasma |
| Zhaoying Wang(王召迎)1,2,†, Lixin Guo(郭立新)3,‡, Maixia Fu(付麦霞)1,2, Shaoshuai Guo(郭韶帅)1,2, and Yinsheng Li(李寅生)1,2 |
1 Key Laboratory of Grain Information Processing and Control (Henan University of Technology), Ministry of Education, Zhengzhou 450001, China;
2 College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China;
3 School of Physics, Xidian University, Xi'an 710071, China |
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Abstract The surface of a high-speed vehicle reentering the atmosphere is surrounded by plasma sheath. Due to the influence of the inhomogeneous flow field around the vehicle, understanding the electromagnetic properties of the plasma sheath can be challenging. Obtaining the electron density of the plasma sheath is crucial for understanding and achieving plasma stealth of vehicles. In this work, the relationship between electromagnetic wave attenuation and electron density is deduced theoretically. The attenuation distribution along the propagation path is found to be proportional to the integral of the plasma electron density. This result is used to predict the electron density profile. Furthermore, the average electron density is obtained using a back-propagation neural network algorithm. Finally, the spatial distribution of the electron density can be determined from the average electron density and the normalized derivative of attenuation with respect to the propagation depth. Compared to traditional probe measurement methods, the proposed approach not only improves efficiency but also preserves the integrity of the plasma environment.
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Received: 17 June 2024
Revised: 05 November 2024
Accepted manuscript online: 19 November 2024
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PACS:
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52.40.Kh
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(Plasma sheaths)
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94.30.Tz
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(Electromagnetic wave propagation)
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98.58.Ay
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(Physical properties (abundances, electron density, magnetic fields, scintillation, scattering, kinematics, dynamics, turbulence, etc.))
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42.25.Dd
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(Wave propagation in random media)
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| Fund: Project supported by the Natural Science Foundation of Henan Province, China (Grant No. 242300420634), the Cultivative Plan of Henan University of Technology (Grant No. 2024PYJH035), the Research Foundation for Advanced Talents of Henan University of Technology (Grant Nos. 2022BS067 and 2022BS068), the National Natural Science Foundation of China (Grant No. 62301211), the Key Research and Development and Promotion Special Project (Science and Technology Research) in Henan Province, China (Grant No. 232102211068), and the Innovative Funds Plan of Henan University of Technology (Grant No. 2022ZKCJ15). |
Corresponding Authors:
Zhaoying Wang, Lixin Guo
E-mail: zywang921@163.com;lxguo@xidian.edu.cn
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Cite this article:
Zhaoying Wang(王召迎), Lixin Guo(郭立新), Maixia Fu(付麦霞), Shaoshuai Guo(郭韶帅), and Yinsheng Li(李寅生) Non-uniform electron density estimation based on electromagnetic wave attenuation in plasma 2025 Chin. Phys. B 34 015201
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