Acoustic characteristics of a barrier-discharge XeCl excilamp

Abstract

The generation of an acoustic signal by means of voltage pulses (f = 15 kHz) applied to the electrodes of a barrier discharge excilamp based on a Xe/Cl 2 = (50-500)/1 mixture kept at a pressure of 5-500 Torr is studied. It is shown that, from the time variation of the acoustic signal intensity, one can judge the time instant the excilamp starts operating in a steady mode. Optimal (in power and efficiency) operating conditions of the excilamp are found (Xe/Cl 2 = 240/1, p = 98 Torr, η ≈ 9.5%). It is experimentally demonstrated that the dis charge energy at a low pressure is spent largely on heating the gas. This is indicative of the volume heat release and volume glow discharge (as the pressure grows, the efficiency of this source of energy consumption drops and more and more energy is spent on acoustic vibration excitation). Under higher pressures, the Fourier spectrum of the acoustic signal becomes richer, the intensity of the spectrum rises, and the dispersion of the signal grows. At very high pressures, the intensity of the acoustic signal drops to a level corresponding to the natural vibrations of the excilamp envelope without the discharge (when the discharge is quenched, the Fou rier spectrum of the signal becomes depleted and contains only harmonics corresponding to the carrier fre quency of voltage pulses from the power source).

Psoriasis Treatment Efficiency with XeCl-excilamp

“…But the most important is the patient does not suffer from negative feelings. One of the radiation source for the selective phototherapy is an excilamp on a mixture of xenon and chlorine, which has been studied by [1][2][3][4][5]. Excilamps have narrow band spectrum in comparison with luminescent lamps, widely used in phototherapy.…”