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Schematic diagram of experimental setup.
IGBT gate driving signal (upper), applied voltage, and current waveform (lower lines). Rotational temperature evolution of (lower solid circle).
(a) Time-averaged emission intensity of excited species, (b) driving voltage characteristics, and time-averaged rotational temperature of as a function of He flow rate. Ignition and sustain voltage correspond to the voltage needed to initiate the discharge and minimum voltage needed to maintain the discharge, respectively.
Temporal evolution of emission intensity distribution. Bright bars in the figure represent electrodes.
He flow rate dependency on the temporal variation of emission intensity from He, O, and excited species. Solid line corresponds to the discharge current. Driving voltage and switching frequency are 450 V and 40 KHz, respectively.
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