Erlangen 2018 – wissenschaftliches Programm
P 4.5: Vortrag
Montag, 5. März 2018, 15:15–15:30, KI 1.174
Acoustical analysis of surface dielectric barrier and micro hollow cathode discharges — •Daniel Kotschate1, Mate Gaal1, Holger Kersten2, and Luka Hansen2 — 1Department of Non-destructive testing, Bundesanstalt für Materialforschung und -prüfung, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany
Due to the multi-physical appearance of gas discharges the possibilities of interaction with their surrounding environment are very wide. Some of the most common applications are the surface or material modification and acting as an ion source for mass spectroscopy applications. Since atmosphere plasma generates a massive amount of thermal energy caused by collisions in the sheath, this temperature alternation is also able to produce acoustic waves in the ambient gas volume (as lightning and thunder), which is called thermoacoustic effect.
This talk presents an overview of the experimental acoustic analysis of surface dielectric barrier and micro hollow cathode discharges. Regarding other methods of acoustic excitation, the thermoacoustic approach benefits of its massless working principle and the proper impedance matching. In addition to the characterisation, possible applications (e.g. plasma acoustic loudspeaker or transducer for air-coupled ultrasonic testing) concerning these discharge types are presented.