Electric field in APTD in nitrogen determined by EFISH, FNS/SPS ratio, α-fitting and electrical equivalent circuit model
| Autor: | Martina Mrkvičková, Lucia Kuthanová, Petr Bílek, Adam Obrusnik, Zdeněk Navrátil, Pavel Dvorak, Igor V Adamovich, Milan Šimek, Tomas Hoder |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Plasma Sources Science and Technology. |
| ISSN: | 1361-6595 0963-0252 |
| Popis: | We investigate the electric field development in weak microseconds-lasting atmospheric pressure Townsend discharge (APTD) operated in barrier discharge arrangement in pure nitrogen. The electric field is determined using four different methods: laser-aided EFISH (electric field induced second harmonics), optical emission- based FNS/SPS (first negative/second positive systems of molecular nitrogen) intensity ratio, electrical equivalent circuit approach and via determination of the Townsend first coefficient α(E/N) from the optical emission profile. The resulting values of the electric field obtained by the respective methods, regardless of the differences in absolute values, lie within a reasonable range. Limitations and advantages of all methods are discussed in detail for investigated discharge. The EFISH measurements are supported by re- computation of the effective interaction-path of the laser using an electrostatic model. The FNS/SPS method provides systematically higher values compared to other methods. We discuss in detail the potential origins of this discrepancy as this method is at the limit of its applicability due to the impossibility of fully verifying the underlying assumptions. The focused discussion addresses best-practice issues and identifies possible future steps to improve each of the four methods under given conditions. |
| Databáze: | OpenAIRE |
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