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Advanced diagnostic measurements of low and atmospheric pressure plasmas Daniel Simpson (4577368) PUREID: 688014122 plasma physics plasma diagnostics low pressure plasmas atmospheric pressure plasmas In this thesis a comprehensive investigation into diagnostic techniques for low and atmospheric pressure plasma sources was carried out. The major focus was on improving industrial process monitoring (low-pressure) and helping to develop further understanding for electrical probes on plasma jets (atmospheric-pressure).<br><br>For low-pressure plasmas, the study investigates the use of a V/I probe (Octiv) as a non-invasive tool and its ability to stand alongside in-situ measurement tools such as a Retarding field energy analyser (Semion) and Langmuir probe. Models were developed to extract plasma parameters such as ion flux (Jp), ion energy (Ei) and plasma density (n) from external means and benchmarked alongside internal probe data and also various models for low-pressure plasmas.<br><br>For atmospheric-pressure plasmas, a kHz-driven dielectric barrier discharge (DBD) plasma jet was characterized using a Langmuir probe to develop accessible diagnostic methods suitable for research settings. A novel sheath correction which was tailored to atmospheric conditions was introduced and compared against already established approaches from literature. Furthermore, a COMSOL model of the atmospheric system was used for further comparisons of the measurements made. Overall, this thesis demonstrates the feasibility of external diagnostics for real-time plasma monitoring of low-pressure plasmas and advances diagnostic methodology for atmospheric plasma jets.<br> 2026-10-01T16:13:32Z Text Thesis 10.17034/32805746.v1 https://figshare.com/articles/thesis/Advanced_diagnostic_measurements_of_low_and_atmospheric_pressure_plasmas/32805746 All Rights Reserved