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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Low-frequency sound generation by modulated repetitively pulsed nanosecond plasma discharges
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Low-frequency sound generation by modulated repetitively pulsed nanosecond plasma discharges

机译：通过调制重复脉冲纳秒等离子体放电通过调制低频声音

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摘要

The acoustic source amplitude of low-frequency modulated spark discharges is determined experimentally. Burst and pulse-density modulation are utilized in order to generate source components at frequencies much lower than the pulse repetition frequency. Pulse sequences consist of high-voltage pulses with 10 ns duration, 9-12 kV amplitude, and pulse repetition frequencies up to 30kHz. The source amplitude is experimentally determined by microphone measurements in an impedance tube. Spurious components in the measured pressure signals, associated with electromagnetic noise from the high-voltage discharges, are removed by appropriate data processing. The Fourier component of the electric power at the modulation frequency is determined by phase-averaged pulse energy measurements, and the relation between electric power and sound source amplitude is revealed. The effect of pulse energy, electrode gap distance, and the number of pulses per modulation period on the initialization phase, during which HV-pulses do not generate sparks, is determined. An analytical model based on sound generation by unsteady heating is employed to estimate the acoustic source amplitude from the electrical power input; good overall agreement with the measured source amplitudes is observed. The sound generated by low-frequency modulated NRP discharges in the present work, with modulation frequencies in the range of 50-1000 Hz, can be predicted well by assuming that the entire electrical power acts as unsteady heating over the relevant timescales.
机译：实验确定低频调制火花放电的声源幅度。利用突发和脉冲密度调制以在远低于脉冲重复频率的频率下产生源分量。脉冲序列由高压脉冲组成，具有10ns持续时间，9-12 kV幅度和高达30kHz的脉冲重复频率。通过阻抗管中的麦克风测量实验确定源幅度。通过适当的数据处理去除与来自高压放电的电磁噪声相关联的测量压力信号中的寄生成分。调制频率处的电力的傅里叶组件由相平方脉冲能量测量确定，并且揭示了电力和声源幅度之间的关系。确定脉冲能量，电极间隙距离和初始化阶段上的每个调制周期的脉冲数的影响，在此期间HV-脉冲不会产生火花。基于非定常加热的声音产生的分析模型用于估计电力输入的声学源幅度;观察到与测量的源极幅度的良好总体协议。通过假设整个电力作为在相关时间尺度不稳定的情况下，可以通过50-1000Hz的调制频率在当前工作中产生的低频调制NRP放电产生的声音。

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