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3.2. CO2 DISSOCIATION IN A DBD 3. PROPERTIES OF MICRO-DISCHARGES 40 2 30 1 20 0 10 −1 0 −2 0 0.01 0.02 0.03 0.04 0.05 t/T Figure 3.5: A typical Current Charge plot as a function of time. T ≈ 44μs cor- responds to the time period of voltage cycle. The red dashed box shows the charge transferred during the one filament. Condition: 12 kVpk−pk, 200 mbar, 700 sccm, second filament in a HC in pure CO2 in the charge to account for the extra charge transport of the accumulated charge on the surface. ∆Qf can be measured by measuring the step height in the charge signal. If for example the filament occurs at an instant t0 (which is obtained from the current sig- nal), then the step height is measured by finding the difference in the charge signal from t0 −100nstot0 +100ns.Thiswindowof200nsischosensoastoaccountforslight error in detecting the time-instance of filament and also for the slow decay phase of a filament (see section3.1.1). This method is applicable only when each charge transfer event can be separated in time which is possible in a pin-pin reactor. It also relies on the fact that charge transfer occurs in a narrow time scale, ≈ 100 ns much shorter compared with the time period of voltage cycle 44 μs approximately. 3.2.3 Determination of CO densities Two kinds of infrared absorption spectroscopies were used to measure CO produced from dissociation of CO2, ex-situ: Quantum cascade laser absorption spectroscopy (QCLAS) and Fourier Transform Infrared (FT-IR) absorption spectroscopy. In general, all absorp- tion spectroscopies are variants of measuring absorption signal using Beer-Lamberts law I(λ) = I0(λ)e−nσ(λ)L (3.5) 49 Current (mA) Qcap(nC)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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