Plasma diagnostics are usually performed with immersive probes that collect the cumulative electric currents created by charged particles. Idealized models are applied to the resulting I-V curves to extract plasma flow parameters. Our non-invasive technique, based on passive emission spectroscopy (PES), allows for the remote measurement of undisturbed plasma parameters via fine spectral effects. Importantly, it can be applied to each plasma species separately, including neutral components. However, extremely high spectral resolution is required to resolve shapes of the spectral lines. We describe a portable instrumentation system that delivers sub-pm resolution in visible and near-infrared regions of the spectrum. It can be used to measure various plasma parameters but most notably allows the drift velocities of ions and neutrals to be resolved with ∼100 m/s precision. We discuss details of our experimental apparatus, along with capabilities and limitations of the PES implementation.

中文翻译：

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用于等离子体参数远程测量的高分辨率光谱系统

等离子体诊断通常使用浸入式探头进行，这些探头收集由带电粒子产生的累积电流。将理想化模型应用于生成的 IV 曲线以提取血浆流量参数。我们基于被动发射光谱 (PES) 的非侵入性技术允许通过精细光谱效应远程测量未受干扰的等离子体参数。重要的是，它可以分别应用于每个等离子体种类，包括中性成分。然而，需要极高的光谱分辨率来解析谱线的形状。我们描述了一种便携式仪器系统，可在光谱的可见光和近红外区域提供亚微米分辨率。它可用于测量各种等离子体参数，但最显着的是允许以~100 m/s 的精度解析离子和中性物质的漂移速度。我们讨论了我们的实验装置的细节，以及 PES 实施的能力和局限性。