Measurements of the electric field: four methods match
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| Year of publication | 2022 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | The electric field is one of the essential plasma parameters which determines the discharge dynamics and initiates chemistry in the plasma. Different experimental methods have been developed and applied for electric field determination. Yet, with such a variety of discharge types, gases and other conditions, it is usually only one method matching the requirements of the studied discharge system. The aim of our work was to investigate several experimental methods for the determination of the electric field development and compare their results obtained under the same discharge conditions. The object suitable for all methods was a weak microseconds-lasting atmospheric pressure Townsend discharge (APTD) operated in the dielectric barrier configuration in pure nitrogen. We chose four methods: laser-aided EFISH (electric field induced second harmonics generation), optical emission-based FNS/SPS (first negative/second positive systems of molecular, nitrogen) intensity ratio, equivalent electrical circuit approach, the determination from the first Townsend coefficient ( E/N ) acquired from the spatial rise of the optical emission intensity. The resulting electric field values are in a reasonable range, yet show mutual discrepancies. Limitations, advantages and sources of systematical errors of all methods are discussed in detail for investigated discharge. Special attention is paid to the EFISH method, whose measurements are supported by the re-computation of the effective interaction path of the laser using an electrostatic model. |
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