An algorithm for extremely complicated interference pattern evaluation

A description of an easy algorithm for evaluation of interference patterns recording the light beam deflection in phase objects is presented in this paper. The method is suitable for digitizing and evaluating complicated interference patterns containing heavily distorted, double or closed interferen...

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Bibliographic Details
Published in:Review of scientific instruments 2005-07, Vol.76 (7), p.073103-073103-6
Main Authors: Olejnicek, J., Pichal, J., Blazek, J., Spatenka, P., Czech Technical University, Faculty of Electrical Engineering, Technicka 2, Prague, University of South Bohemia, Department of Physics, Jeronymova 10, C. Budejovice, Technical University of Liberec, Faculty of Mechanical Engineering, Halkova 6, Liberec
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
ALGORITHMS
BEAMS
DEFORMATION
DEUTERIUM
ELECTRIC DISCHARGES
ELECTRON DENSITY
ELECTRON TEMPERATURE
EVALUATION
INTERFERENCE
INTERFEROMETRY
ION TEMPERATURE
MESH GENERATION
PHASE SHIFT
PINCH EFFECT
PLASMA DENSITY
PLASMA DIAGNOSTICS
SHOCK WAVES
VISIBLE RADIATION
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Summary:A description of an easy algorithm for evaluation of interference patterns recording the light beam deflection in phase objects is presented in this paper. The method is suitable for digitizing and evaluating complicated interference patterns containing heavily distorted, double or closed interference fringes. The created algorithm and evaluation procedure result from the lines’ approximation and Delaunay triangulation. They were applied to a complex interference pattern taken in the pinch discharge burning in low-pressure deuterium. The results obtained were used for calculation of electron density values in the discharge channel. The influence of the phase shift deformation outside the region under study on the accuracy of results and on electron density estimation inside the shock wave of the pinch was also analyzed. The gathered data were verified with a calculation of the electron temperature in the discharge channel, which was performed providing kinetic and magnetic pressure equilibriums.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1942534