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dielectric barrier discharge
Dielectric-barrier discharge (DBD) is the electrical discharge between two electrodes separated by an insulating dielectric barrier. Originally called silent (inaudible) discharge and also known as ozone production discharge〔Matsuno, Hiromitsu, Nobuyuki Hishinuma, Kenichi Hirose, Kunio Kasagi, Fumitoshi Takemoto, Yoshinori Aiura, and TatsushiIgarashi. (Dielectric barrier discharge lamp, United States Patent 5757132 ) (Commercial website). Freepatentsonline.com. First published 1998-05-26. Retrieved on 2007-08-05.〕 or partial discharge,〔Dhali, S.K. and I. Sardja. (Dielectric-barrier discharge for the removal of SO2 fromflue gas ). (Abstract only). IEEE International Conference on Plasma Science, 1989; IEEE Conference Record - Abstracts, 1989. Retrieved on 2007-08-05.〕 it was first reported by Ernst Werner von Siemens in 1857.〔Kogelschatz, Ulrich, Baldur Eliasson, and Walter Egli. (From ozone generators to flat television screens: history and future potential of dielectric-barrier discharges ). Pure Applied Chemistry, Vol. 71, No. 10, pp. 1819-1828, 1999. Retrieved on 2007-08-05.〕 On right, the schematic diagram shows a typical construction of a DBD wherein one of the two electrodes is covered with a dielectric barrier material. The lines between the dielectric and the electrode are representative of the discharge filaments, which are normally visible to the naked eye. Below this, the photograph shows an atmospheric DBD discharge occurring in between two steel electrode plates, each covered with a dielectric (mica) sheet. The filaments are columns of conducting plasma, and the foot of each filament is representative of the surface accumulated charge.
== Process ==
The process normally uses high voltage alternating current, ranging from lower RF to microwave frequencies. However, other methods were developed to extend the frequency range all the way down to the DC. One method was to use a high resistivity layer to cover one of the electrodes. This is known as the resistive barrier discharge.〔M. Laroussi, I. Alexeff, J. P. Richardson, and F. F. Dyer " The Resistive Barrier Discharge", IEEE Trans. Plasma Sci. 30, 158 (2002)〕 Another technique using a semiconductor layer of gallium arsenide (GaAs) to replace the dielectric layer, enables these devices to be driven by a DC voltage between 580 V and 740 V.
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