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

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.