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Holographic images of a spark channel generated on the optical wedge surfaces

M. MIHĂILESCU1,* , L. PREDA1, A. PREDA1, E. SCARLAT1

Affiliation

  1. “POLITEHNICA” University of Bucharest, Department of Physics I, 313 Splaiul independenţei, 060042 – Bucharest, Romania

Abstract

In this paper, we present an application of digital holography for the characterization of a SC produced in atmospheric air by a point-point spark gap located between surfaces of an air wedge. This air wedge is obtained using two glass wedges having two wire electrodes situated along the diagonal of glass plates, between their adjacent surfaces. The experimental setup used for power supply of spark gap is built from an saturable transformer. One divergent laser beam passes through this optical system and produces two holographic images (interference images): one obtained from the reflections on the surfaces of the wedges (the hologram) and one from the transmitted beam (the shadowgram). The holographic images are recorded using a CCD camera and computer processed in order to extract the amplitude and the phase corresponding to every image pixel. The holographic and shadowgrapic images are processed with 2D Fourier transform using phase map and fractional correlation..

Keywords

Spark channel, Digital holography, Shadowgram, Fractional correlation.

Submitted at: Sept. 25, 2007
Accepted at: March 17, 2008

Citation

M. MIHĂILESCU, L. PREDA, A. PREDA, E. SCARLAT, Holographic images of a spark channel generated on the optical wedge surfaces, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 3, pp. 623-627 (2008)