Quantitative shadowgraphy and proton radiography for large intensity modulations

Muhammad Firmansyah Kasim, Luke Ceurvorst, Naren Ratan, James Sadler, Nicholas Chen, Alexander Sävert, Raoul Trines, Robert Bingham, Philip N. Burrows, Malte C. Kaluza, and Peter Norreys
Phys. Rev. E 95, 023306 – Published 16 February 2017

Abstract

Shadowgraphy is a technique widely used to diagnose objects or systems in various fields in physics and engineering. In shadowgraphy, an optical beam is deflected by the object and then the intensity modulation is captured on a screen placed some distance away. However, retrieving quantitative information from the shadowgrams themselves is a challenging task because of the nonlinear nature of the process. Here, we present a method to retrieve quantitative information from shadowgrams, based on computational geometry. This process can also be applied to proton radiography for electric and magnetic field diagnosis in high-energy-density plasmas and has been benchmarked using a toroidal magnetic field as the object, among others. It is shown that the method can accurately retrieve quantitative parameters with error bars less than 10%, even when caustics are present. The method is also shown to be robust enough to process real experimental results with simple pre- and postprocessing techniques. This adds a powerful tool for research in various fields in engineering and physics for both techniques.

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  • Received 15 July 2016
  • Revised 13 January 2017

DOI:https://doi.org/10.1103/PhysRevE.95.023306

©2017 American Physical Society

Physics Subject Headings (PhySH)

Plasma PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Muhammad Firmansyah Kasim1, Luke Ceurvorst2, Naren Ratan2, James Sadler2, Nicholas Chen2,*, Alexander Sävert3,4, Raoul Trines5, Robert Bingham5, Philip N. Burrows1, Malte C. Kaluza3,4, and Peter Norreys2,5

  • 1John Adams Institute, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
  • 2Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
  • 3Institut für Optik und Quantenelektronik, Abbe-Center of Photonics, Friedrich-Schiller-Universität, 07743 Jena, Germany
  • 4Helmholtz-Institut Jena, Friedrich-Schiller-Universität, 07743 Jena, Germany
  • 5STFC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

  • *Current address: DSO National Laboratories, 12 Science Park Drive, Singapore 118225, Singapore.

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Issue

Vol. 95, Iss. 2 — February 2017

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