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Proceedings Paper

Plasma diagnostical investigations of high-density metal vapor discharge lamps using temporally and spatially resolved spectral interferometry
Author(s): Martin Hipp; Walter Fliesser; Theo Neger
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Paper Abstract

An optimization of the discharge parameters of high pressure mercury lamps with respect to improved emission properties and longer lifetimes has to be performed using results of advanced model calculations. However, the reliability of these models critically depends on the availability of accurate experimental data. The aim of this work was to provide spatially resolved particle densities of neutral mercury atoms by side-on spectral interferometry. The main challenge was to find an optical arrangement that enables one to compensate for the strong wavefront distortion in the object arm caused by the extreme curvature of the bulb of the discharge lamp, a general problem in classical interferometry. The interferograms could be taken with a time-resolution of 150 microsecond(s) at any phase of the discharge current that varied with 50 Hz. The applied spectro- interferometric technique was a phase method developed at the institute. It supplies a highly resolved phase of the light wavefronts passing the plasma using FFT algorithms. By an Abel-inversion of the side-on data mercury density profiles could be presented for cross-sections ranging up to 10 mm as consequence of the specially designed test and reference beams in the used Mach-Zehnder interferometer.

Paper Details

Date Published: 17 August 1999
PDF: 8 pages
Proc. SPIE 3745, Interferometry '99: Applications, (17 August 1999); doi: 10.1117/12.357780
Show Author Affiliations
Martin Hipp, Technische Univ. Graz (Austria)
Walter Fliesser, Technische Univ. Graz (Austria)
Theo Neger, Technische Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 3745:
Interferometry '99: Applications
Werner P. O. Jueptner; Krzysztof Patorski, Editor(s)

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