Spatial emission behaviour of dielectric barrier discharge lamp driven by sinusoidal or pulsed voltage excitation

Xenon excimer dielectric barrier discharge is a good candidate for free mercury lamp. The studied device is consisting of two glass plates separated by a constant gas gap. The glass thickness is 4 mm and the gap 2 mm. A transparent conducting material (electrode) has been deposited on both external sides and phosphors (white emitting powders) on both internal sides of the dielectric. The lamp is filled with rare gas mixture and operates in a pressure range of 100-400 torr. A sinusoidal or a pulsed excitation voltage can be used up to 3000 V in a frequency range of 10-50 kHz. In a previous work for sinusoidal excitation, we shown the influence of the applied voltage (amplitude and frequency) on the consuming power, the light emission and mostly on the non-homogeneity of the discharge. Using a 2 dimensional model developed in our laboratory, the effects of the applied voltage (amplitude and frequency) and the pressure will be studied. Particularly on the distance between the streamers when the discharge is not homogeneous. In this work, for pulsed excitation, we will present some results concerning a Ne-Xe 50% mixture for three different pressures and we will discuss the influence of the applied voltage (waveforms, amplitude and frequency) on the consuming power, the light emission (ICCD and luminance) and mostly on the spatial emission of the discharge. We will also compare experimental results between sinusoidal and pulsed excitations.