Plasma crystal dynamics measured with a three-dimensional plenoptic camera

Jambor, Martin; Nosenko, V.; Zhdanov, S. K.; Thomas, Hubertus M.

doi:10.1063/1.4943269

Cited by 13 publications

(10 citation statements)

References 49 publications

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“…Therefore, other methods allowing to acquire 3D information instantaneously are being investigated. Among them are, for example, usage of the so-called plenoptic cameras, [189] digital in-line holography [190] and stereoscopy. [191,192] Stereoscopic diagnostics is planned to be a part of the future microgravity complex plasma facility on the ISS COMPACT.…”

Section: Positions Velocities and Number Densitymentioning

confidence: 99%

Physical aspects of dust–plasma interactions

Pustylnik

Pikalev

Zobnin

et al. 2021

Contributions to Plasma Physics

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Low‐pressure gas discharge plasmas are known to be strongly affected by the presence of small dust particles. This issue plays a role in the investigations of dust particle‐forming plasmas, where the dust‐induced instabilities may affect the properties of synthesized dust particles. Also, gas discharges with large amounts of microparticles are used in microgravity experiments, where strongly coupled subsystems of charged microparticles represent particle‐resolved models of liquids and solids. In this field, deep understanding of dust–plasma interactions is required to construct the discharge configurations which would be able to model the desired generic condensed matter physics as well as, in the interpretation of experiments, to distinguish the plasma phenomena from the generic condensed matter physics phenomena. In this review, we address only physical aspects of dust–plasma interactions, that is, we always imply constant chemical composition of the plasma as well as constant size of the dust particles. We also restrict the review to two discharge types: dc discharge and capacitively coupled rf discharge. We describe the experimental methods used in the investigations of dust–plasma interactions and show the approaches to numerical modelling of the gas discharge plasmas with large amounts of dust. Starting from the basic physical principles governing the dust–plasma interactions, we discuss the state‐of‐the‐art understanding of such complicated, discharge‐type‐specific phenomena as dust‐induced stratification and transverse instability in a dc discharge or void formation and heartbeat instability in an rf discharge.

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Section: Positions Velocities and Number Densitymentioning

confidence: 99%

Physical aspects of dust–plasma interactions

Pustylnik

Pikalev

Zobnin

et al. 2021

Contributions to Plasma Physics

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“…An uncertainty in the reconstructed image will be attributed to the spatial resolution of an elemental image on CMOS sensor [24]. The length h of a side of a pixel on the CMOS sensor produces uncertainties in the plane perpendicular to the z-axis as hL l (8) and along the z-axis itself as…”

Section: Focal Length F Of a Convex Lens Array Plotted As A Function mentioning

confidence: 99%

“…Example applications are particle tracking for velocimetry [16][17][18][19], microscopy measurement [20,21], spray imaging [22], etc. In the research filed of plasma, 3D reconstructions of positions of particles levitating in a plasma have been demonstrated using commercial light-field Lytro cameras [23], and the time evolution of dusty plasmas has been measured using a commercial light-field Raytrix camera [24]. An open-ended plenoptic camera, which is constructed with a lens array and a typical reflex CMOS camera, obtained the 3D positions of dust particles in a radio-frequency (RF) plasma [25,26].…”

Section: Introductionmentioning

confidence: 99%

Integral Photography Technique for Three-Dimensional Imaging of Dusty Plasmas

Sanpei¹

2020

Progress in Fine Particle Plasmas

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The integral photography technique has an advantage in which instantaneous three-dimensional (3D) information of objects can be estimated from a singleexposure picture obtained from a single viewing port. Recently, the technique has come into use for scientific research in diverse fields and has been applied to observe fine particles floating in plasma. The principle of integral photography technique and a design of a light-field camera for dusty plasma experiments are reported. The important parameters of the system, dependences of the size of the imaging area, and the spatial resolution on the number of lenses, pitch, and focal length of the lens array are calculated. Designed recording and reconstruction system is tested with target particles located on known positions and found that it works well in the range of dusty plasma experiment. By applying the integral photography technique to the obtained experimental image array, the 3D positions of dust particles floating in an RF plasma are identified.

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“…Complex plasmas are three-dimensional systems, and recently the interest in 3D optical particle diagnostics is growing [ 13 , 14 ]. To triangulate the real position of a particle in 3D space, additional requirements are imposed on particle detection algorithms.…”

Section: Introductionmentioning

confidence: 99%

Algorithms for Particle Detection in Complex Plasmas

et al. 2019

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In complex plasmas, the behavior of freely floating micrometer sized particles is studied. The particles can be directly visualized and recorded by digital video cameras. To analyze the dynamics of single particles, reliable algorithms are required to accurately determine their positions to sub-pixel accuracy from the recorded images. Typically, a straightforward algorithm such as the moment method is used for this task. Here, we combine different variations of the moment method with common techniques for image pre- and post-processing (e.g., noise reduction and fitting), and we investigate the impact of the choice of threshold parameters, including an automatic threshold detection, on synthetic data with known attributes. The results quantitatively show that each algorithm and method has its own advantage, often depending on the problem at hand. This knowledge is applicable not only to complex plasmas, but useful for any kind of comparable image-based particle tracking, e.g., in the field of colloids or granular matter.

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Plasma crystal dynamics measured with a three-dimensional plenoptic camera

Cited by 13 publications

References 49 publications

Physical aspects of dust–plasma interactions

Physical aspects of dust–plasma interactions

Integral Photography Technique for Three-Dimensional Imaging of Dusty Plasmas

Algorithms for Particle Detection in Complex Plasmas

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