Understanding CO2 containing non-equilibrium plasmas

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Understanding CO2 containing non-equilibrium plasmas ( understanding-co2-containing-non-equilibrium-plasmas )

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3. PROPERTIES OF MICRO-DISCHARGES 3.2. CO2 DISSOCIATION IN A DBD Gas out Gas in 0.4 mm 1 mm 1.72 mm 2 mm Figure 3.2: Schematic showing reactor. In the top panel CQ: Lissajous capacitor R: Rogowski coil P1: High voltage probe P2: is voltage probe for Lissajous capa- citor. Bottom panel is the blown up figure of the electrodes and their dimensions voltage while the other is grounded. The gap between the electrodes was 1.72 mm and the thickness of dielectric is 0.5 mm. These electrodes are enclosed in a cylindrical cell with two gas ports, one for gas input and the other for exhaust. The diameter of cylindrical cell is 5 cm and the height of 1 cm; the total volume of gas cell is 19.63 cm3. The circular part of the cylindrical cell is made of quartz so as to allow maximum light to be transmitted out. Other relevant dimensions are shown in the figure 3.2. A sinusoidal voltage source with adjustable impedance so as to resonantly match the impedance of the reactor has been used; maximum voltage up-to 25 kVpk−pk was achieved and depending on the plasma condition, frequencies ranging between 22.5 and 23 kHz were used. The voltage on the high voltage electrode is measured using a com- mercially available high voltage probe represented with P1 in the figure 3.2. The current through the reactor is measured using a Rogowski coil, represented with R in the fig- ure 3.2. The charge through the reactor, Qcap, is stored in a 140 pF capacitor, called a Lissajous capacitor in the context of DBDs. The charge measurement is required to cal- culate the power injected into the plasma (see section 3.2.2). The capacitor is represented with CQ in the figure 3.2. Qcap is measured by measuring the voltage across Lissajous capacitor using a voltage probe, represented with P2 in the figure 3.2. The exhaust of 46

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