M. Spaan et al., Dielectric barrier discharges with steep voltage rise: laser absorption spectroscopy of NO concentrations and temperatures, PLASMA SOUR, 9(2), 2000, pp. 146-151
Laser absorption spectroscopy was applied to determine in situ particle con
centrations and temperatures in an atmospheric pressure dielectric barrier
discharge. The measurements were performed with a small model reactor. The
electrical excitation was by fast voltage pulses rising to 20 kV in about 3
00 ns (in some later measurements in approximately 90 ns); the repetition r
ate was 50 kHz maximum. Effects of filament distribution and discharge homo
geneity were investigated. The fast rising voltage has the consequence that
all filaments are generated within a 50 ns interval for each half-cycle. O
bservation of the NO gamma(0, 0)-band allows the determination of NO concen
trations, spatially resolved as a function of the distance from a single fi
lament; gas temperatures can be inferred from a comparison of calculated an
d measured line absorptions in characteristic narrow spectral intervals.