High-Speed Camera and Fibered Optical Wave Microphone Measurements on Surface-Dielectric-Barrier Discharges

Abstract

Much focus has been placed on the aerodynamics of surface-dielectric-barrier discharges to control air flow. An important factor to consider to understand the mechanism is pressure waves, which include acoustic waves and shock waves that are emitted from the surface-dielectric-barrier discharges. In this paper, a fibered optical wave microphone, which improves upon a conventional optical wave microphone with regard to signal-to-noise ratio, was developed to detect these pressure waves with high precision. This paper explores the properties of the fibered optical wave microphone. A high-speed camera was used to capture time-resolved microdischarges. After simultaneous observation of the applied voltage, current, pressure waves, and microdischarge images for the surface-dielectric-barrier discharge, the relationships among these factors were analyzed and discussed.Index Terms-Fibered optical wave microphone, high-speed camera, microdischarge plasma, shock waves, surface-dielectricbarrier discharge. Science and Technology, Kumamoto University, since 2014. He has contributed more than 100 papers in international journals and conference proceedings. His current research interests include time-resolved observation of discharge plasmas in atmospheric pressure, pressure waves from discharges, laser-solid processes and thin film fabrication, laser ablation in supercritical fluids, optical wave microphone technique, and the applications of ozone for plants, soil, and water. He has contributed more than 100 papers in international journals and conference proceedings. His current research interests include plasma processes, preparation of functional thin films, discharges in low temperature superfluidity liquid helium, and time-resolved observation of discharge plasmas in low pressure and atmospheric pressure.