Optical characteristics of double and single surface dielectric barrier discharges

Summary form only given. Asymmetric double (both electrodes insulated) and single (one electrode insulated) surface barrier discharges\´ are investigated. Both geometries used one wire electrode and one copper tape electrode. The discharges are driven by 1 kHz symmetric triangle waveforms. Time- and space- resolved light emissions are recorded by an intensified charge-coupled device (ICCD) camera, with a minimum exposure time of 2 ns. In the single-barrier geometry, filamentary plasmas are observed when the voltage on the exposed electrode is increasing, and "diffuse" jet-like plasma are observed when the voltage is decreasing. In the double- barrier geometry, both structures are observed simultaneously, but in opposite directions, in all plasmas. Additional similarities will be discussed.