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Proceedings Paper

Coding Aperture Applied To X-Ray Imaging Of Laser-Plasmas
Author(s): N. Fleurot; J. P. Gex; R. Sauneuf; N. de Beaucoudray
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Paper Abstract

The investigation of phenomena occuring into micro-plasmas created by laser is mainly based on images obtained from emitted X-rays or α,-particles. To get images, the pinhole camera is widely used but the collection efficiency of radiation or particles, as also the Signal-to-Noise ratio (S/N ratio) decrease as the spatial resolution is increased. To improve the S/N ratio one can use a coding-aperture imaging device, the collecting surface of which is much higher that the pinhole-one. In this study we have chosen a simple coding-aperture made of a circular slit cut in a thin foil which is opaque at the considered radiation. The slit width is δ = 6 μm ; the mean radius is R = 1 mm. The image reconstruction is obtained by numerical processing (Fourier-transform and filtering). The transverse spatial resolution 6t in the object is δ t = δ but can be improved by a factor of 2 or 3 if the edges of the circular slit are sharp. The axial spatial resolution (tomographic effect) δl is δl, = δt l1/R, with ll the code-to-object distance.

Paper Details

Date Published: 9 August 1983
PDF: 5 pages
Proc. SPIE 0312, 1st European Conf on Cineradiography with Photons or Particles, (9 August 1983); doi: 10.1117/12.932931
Show Author Affiliations
N. Fleurot, C.E.A./C.E.L (France)
J. P. Gex, C.E.A./C.E.L (France)
R. Sauneuf, C.E.A./C.E.L (France)
N. de Beaucoudray, I.O.T.A. (France)

Published in SPIE Proceedings Vol. 0312:
1st European Conf on Cineradiography with Photons or Particles
Jacques J. Marilleau, Editor(s)

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