平行板结构直流微放电的振荡模式
Oscillation modes of dc microdischarges with parallel-plate geometry
摘要：
在平行板微放电中观察到两种不同的振荡模式：频率范围在1.23和2.1 kHz之间的弛豫振荡和频率为7 kHz的自由振荡。振荡模式是由增加电源电压或放电电流引起的。对于给定的电源电压，存在从一种振荡模式到另一种振荡模式的自发转变，反之亦然。在从弛豫振荡过渡到自由振荡之前，测量了弛豫振荡从1.3 kHz到2.1 kHz的振荡频率的自发增加。弛豫振荡的傅立叶变换谱揭示了微放电的混沌行为。与弛豫振荡相关的伏安特性曲线描述了低电流、扩散放电和正常辉光之间的周期性转变。然而，自由振荡只出现在次正常辉光。
英文摘要：
Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced by increasing power supply voltage or discharge current. For a given power supply voltage, there is a spontaneous transition from one to other oscillation mode and vice versa. Before the transition from relaxation to free-running oscillations, the spontaneous increase of oscillation frequency of relaxation oscillations form 1.3 kHz to 2.1 kHz is measured. Fourier Transform Spectra of relaxation oscillations reveal chaotic behaviour of microdischarge. Volt-Ampere characteristics associated with relaxation oscillations describes periodical transition between low current, diffuse discharge and normal glow. However, free-running oscillations appear in subnormal glow only.
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