使用相位分辨激光诱导荧光光谱在霍尔效应推进器中进行离子动力学表征
Ion dynamic characterization using phase-resolved laser-induced fluorescence spectroscopy in a Hall effect thruster
AI总结：
本文提出一种基于LIF光谱和Hilbert变换的相位分辨新技术，用于在霍尔效应推进器呼吸模式下实时测量离子速度分布变化。
摘要：
使用如激光诱导荧光（LIF）诊断等微创技术，可以获得霍尔效应推进器中等离子体成分动力学的重要信息。LIF提供了一个极好的工具，能以高空间分辨率确定离子速度分布函数。即使在稳态运行中，由于推进器放电持续存在的时间相关特性，记录速度分布的时间分辨图谱仍然很重要。导致离子速度分布时间相关的一个突出现象通常归因于呼吸模式，其特征是放电电流有显著振荡。本工作的目标是提出一种基于LIF光谱在呼吸周期内进行相位分辨的等离子体动力学研究新技术。为此，使用Hilbert变换来定义推进器电流振荡的瞬时相位。得益于对数据的全数值分析，能够在振荡的指定相位上同时且实时地测量离子速度分布的修正情况。
英文摘要：
Significant information on the dynamics of the plasma constituents in Hall effect thrusters can be obtained using minimally-intrusive techniques such as laser-induced fluorescence (LIF) diagnostics. Indeed, LIF provides an excellent tool to determine the ion velocity distribution function with high spatial resolution. Even in a steady-state operation, recording time-resolved maps of the velocity distribution is relevant due to persisting time-dependent features of the thruster discharge. One of the preeminent phenomena that renders the ion velocity distribution time dependent is commonly attributed to the breathing mode, characterized by pronounced oscillations in the discharge current. The goal of this work is to propose a new technique for plasma dynamic studies based on LIF spectroscopy with phase-resolution during the breathing period. To this purpose, the Hilbert transform is used to define the instantaneous phase of oscillation of the thruster current. Ion velocity distribution modification, over assigned phases of oscillation, is measured simultaneously and in real-time thanks to fully numerical analysis of the data.
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