Jambor M, Nosenko V, Zhdanov S K, Thomas H M
Deutsches Zentrum für Luft- und Raumfahrt, Forschungsgruppe Komplexe Plasmen, D-82234 Weßling, Germany.
Max-Planck-Institut für extraterrestrische Physik, D-85748 Garching, Germany.
Rev Sci Instrum. 2016 Mar;87(3):033505. doi: 10.1063/1.4943269.
Three-dimensional (3D) imaging of a single-layer plasma crystal was performed using a commercial plenoptic camera. To enhance the out-of-plane oscillations of particles in the crystal, the mode-coupling instability (MCI) was triggered in it by lowering the discharge power below a threshold. 3D coordinates of all particles in the crystal were extracted from the recorded videos. All three fundamental wave modes of the plasma crystal were calculated from these data. In the out-of-plane spectrum, only the MCI-induced hot spots (corresponding to the unstable hybrid mode) were resolved. The results are in agreement with theory and show that plenoptic cameras can be used to measure the 3D dynamics of plasma crystals.
使用商用全光相机对单层等离子体晶体进行了三维（3D）成像。为了增强晶体中粒子的面外振荡，通过将放电功率降低到阈值以下来触发其中的模式耦合不稳定性（MCI）。从记录的视频中提取了晶体中所有粒子的3D坐标。根据这些数据计算了等离子体晶体的所有三种基本波模式。在面外光谱中，仅分辨出了MCI诱导的热点（对应于不稳定混合模式）。结果与理论相符，表明全光相机可用于测量等离子体晶体的3D动力学。
