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3. PROPERTIES OF MICRO-DISCHARGES 3.2. CO2 DISSOCIATION IN A DBD 50 10 40 8 30 6 20 4 10 2 00 −10 −20 −30 −40 −50 −1 −0.5 0 0.5 −2 −4 −6 −8 1 −10 t/T Figure 3.4: A typical Current Voltage plot as a function of time. T ≈ 44μs cor- responds to the time period of voltage cycle. Condition: 17 kVpk−pk, 600 mbar, 700 sccm. pure CO2 litudes of the current spikes is not very high. In addition to a faster measurement tech- nique, a thorough calibration of parasitic impedances in measurement circuit is required to increase the accuracy of the current signal. However, Rogowski coil is very well suited to measure the time-instant of a filament, that is, the location of the filament on time axis; time-instant of a filament gives information about phase of voltage, current and charge signals when there is a filament. Also, the time instants of filaments are made used to count the number of filaments per half cycle (HC). HC is used as the reference time period because a symmetric DBD characteristics are periodic with every HC in principle. To ensure that each spike in the current corresponds to only one filament, fast optical ima- ging is used (see section 3.2.4). Number of filaments per half cycle has been determined by measuring current for 50 cycles-60 cycles (100 -120 HC) at different voltages (upto 20 kVpk−pk), at different pressures: 200,400,600 and 800 mbar ,and at flows of 500, 600 and 700 sccm at fixed pressure of 600 mbar are used to see the effect of flow. Measuring such large number of cycles enabled to get good statistics on filament distribution (see section 3.3.3) Charge transferred by each filament (∆Qf ) is measured by measuring the change in the Lissajous capacitor voltage when the filament occurs. ∆Qf is the sudden discontinu- ity in the charge signal measured by Lissajous capacitor. An example of charge signal and its corresponding current signal are shown in the figure 3.5 to illustrate the method used to calculate the charge transferred by each filament . The charge signal is a capa- citive response of the combined reactor-measurement system to the applied sinusoidal voltage. However, whenever there is a breakdown, i.e filament, there is a sudden change 48 Current (mA) U (kV) applPDF Image | Understanding CO2 containing non-equilibrium plasmas
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