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Title: Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX

Abstract

Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed. 2008 American Institute of Physics. __________________________________________________

Authors:
Publication Date:
Research Org.:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
950779
Report Number(s):
PPPL-4389
TRN: US0902055
DOE Contract Number:
DE-ACO2-09CH11466
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAMERAS; DUSTS; TRAJECTORIES; NSTX

Citation Formats

W.U. Boeglin, A.L. Roquemore, and R. Maqueda. Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX. United States: N. p., 2009. Web. doi:10.2172/950779.
W.U. Boeglin, A.L. Roquemore, and R. Maqueda. Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX. United States. doi:10.2172/950779.
W.U. Boeglin, A.L. Roquemore, and R. Maqueda. 2009. "Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX". United States. doi:10.2172/950779. https://www.osti.gov/servlets/purl/950779.
@article{osti_950779,
title = {Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX},
author = {W.U. Boeglin, A.L. Roquemore, and R. Maqueda},
abstractNote = {Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed. 2008 American Institute of Physics. __________________________________________________},
doi = {10.2172/950779},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2009,
month = 3
}

Technical Report:

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  • Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed.
  • The subject of this thesis is the assignment of 3-D points to trajectories in the context of computer vision and image understanding. Successive frames of points, 3-D range-images, are assigned to trajectories according to smoothness of motion criteria. No assumptions are made about rigidity of objects. The 3-D range images used may originate from any range finder such as stereo vision, a time-of-flight range finder, etc. These range images are assumed to be arriving in a variety of applications such as autonomous vehicle navigation or intrusion detection in addition to its application in scene analysis. Greedy exchange algorithms are examinedmore » and versions that accept continuously arriving sets of points are implemented in the C programming language. The algorithm implementations are embedded in a software test-frame which simulates the continuous arrival of 3-D range-images. The simulated range images are generated in such a way as to assign points to trajectories at random. Then the algorithms are used to reassign the points to the correct trajectories, thus testing the efficacy of the algorithms. A parallel implementation is attempted on a 12 processor Encore computer and some possibilities for a processor array implementation, such as a systolic array or a wavefront array processor, are described. 17 refs., 20 figs.« less
  • This report documents two computer programs that use currents from numerical lake circulation models to predict the motion of particles and dissolved substances. Movement of particles in the water is related to the vertically averaged current and to a percentage of the surface wind. Dissolved substances are assumed to be vertically mixed and thus to move only with the current. The user must provide bathymetric data, initial conditions, currents, winds, and a subroutine to generate output. One of the more practical applications of lake and ocean circulation models is the prediction of drifting object trajectories for search and rescue operationsmore » or oil and chemical spill cleanup.« less
  • The Kuwabara solution for creeping fluid flow through periodic arrangement of cylinders is widely used in analytic and numerical studies of fibrous filters. Numerical solutions have shown that the Kuwabara solution has systematic errors and when used for the particle trajectories in filters it results in some error in the predicted filter efficiency. The numerical solutions although accurate, preclude further analytic treatments and are not as compact and convenient to use as the Kuwabara solution. By re-examining the outer boundary conditions of the Kuwabara solution, we have derived a correction term to the Kuwabara solution to obtain an extended solutionmore » that is more accurate and improves prediction of the filter efficiency. By comparison with the numerical solutions, it is shown that the Kuwabara solution is the high porosity asymptote and that the extended solution has an improved porosity dependence. We explain a rectification which can make particle collection less efficient for periodic, in-line arrangements of fibers with particle diffusion or body force. This rectification also results in the alignment of particles with inertia (i.e., high Stokes number particles).« less