PDF
Full
Outline
The emission spectra of meter-scale long air gap discharge are of great significance for revealing its microscopic physical characteristics and discharge mechanism. In this paper, an experimental platform for a 2 m rod-plane positive polarity long air gap discharge was established. Using a slitless transmission grating and a high-speed camera, the emission spectra of the leader discharge channel in the wavelength range of 400-900 nm were obtained under standard switching impulse voltage. By comparing and analyzing the light intensity distribution and spectral characteristics at six different positions along the main discharge channel, the spectral evolution law before and after air gap breakdown was revealed. Combined with the theory of plasma spectroscopy, the electron temperature at different positions in the discharge channel was further estimated, and its spatiotemporal evolution characteristics were obtained. The results show that the radiation in different wavelength regions of the spectrum corresponds to spectral lines of different ionization states and elements. During the main discharge stage, the ion lines (such as NII) rapidly intensify, while the neutral atomic lines (such as NI and OI) develop more slowly. During the breakdown process, intense radiation simultaneously appears in the visible region (NII lines) and the near-infrared region (NI and OI lines) of the discharge channel, both reaching peak intensities. Based on the Boltzmann plot method, the average electron temperatures of the discharge core channel and the corona sheath layer are estimated using the characteristic spectral line groups of NII and OI, respectively. It is also found that the electron temperature in the discharge channel exhibits a rapid decreasing trend over time.
PDF
49
26
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
