Experimental comparison of terahertz time-domain spectroscopy with double-probe methods in atmospheric plasma density diagnosis

Jinhai Sun; He Cai; Yan Zheng; Xianli Zhu; Xutao Zhang; Yongqiang Liu; Xinxue Sun; Zengming Chao; Hongcheng Yin

doi:10.1117/12.2613794

8 July 2022 Experimental comparison of terahertz time-domain spectroscopy with double-probe methods in atmospheric plasma density diagnosis

Jinhai Sun, He Cai, Yan Zheng, Xianli Zhu, Xutao Zhang, Yongqiang Liu, Xinxue Sun, Zengming Chao, Hongcheng Yin

Author Affiliations +

Proceedings Volume 12284, 2021 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications; 1228402 (2022) https://doi.org/10.1117/12.2613794
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

An atmospheric plasma jet was generated by ionizing nitrogen ejected from a torch loaded with high voltage. The acquisition of transmission spectra by terahertz time-domain spectroscopy was carried out at three locations at different distances from the plasma torch nozzle. Combined with the theoretical model of terahertz pulse propagation in uniform plasma medium, the average density of plasma was calculated from the phase shift and spectral amplitude ratio measured experimentally. By comparing the measurement results of plasma density with those of Langmuir double-probe for these three different positions, the feasibility of measuring average density of atmospheric plasma with terahertz time-domain spectroscopy was corroborated.

Citation Download Citation

Jinhai Sun, He Cai, Yan Zheng, Xianli Zhu, Xutao Zhang, Yongqiang Liu, Xinxue Sun, Zengming Chao, and Hongcheng Yin "Experimental comparison of terahertz time-domain spectroscopy with double-probe methods in atmospheric plasma density diagnosis", Proc. SPIE 12284, 2021 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications, 1228402 (8 July 2022); https://doi.org/10.1117/12.2613794

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available