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Optical Engineering • Open Access

Novel micro-optical collector design for a gas chromatographic detector based on atomic emission spectroscopy
Author(s): Matthias Gruber; Michael Bohling; Holger Winkelmann; Hans Knuppertz

Paper Abstract

We report a novel micro-optical systems approach for gas chromatographic detection based on plasma excitation of the eluate and subsequent emission spectroscopic evaluation. Specifically, we propose a detector architecture that integrates a microhollow cathode setup and an optical collector system on a common planar microsystems platform. The collector consists of an array of identical imaging systems that surround the microplasma and couple the emitted light side-on into fibers via which it can be fed into a spectrometer. Elliptically shaped reflector profiles ensure nearly aberration-free achromatic imaging and hence a high coupling efficiency. This is confirmed by ray-tracing simulations. An experimental demonstration of the detector module is assembled. The elliptical profiles are milled out of aluminium with diamond tools on an ultraprecision machining center. Experimental tests with a He plasma prove that a higher optical coupling efficieny than with the traditional end-on signal pickup scheme can be achieved.

Paper Details

Date Published: 1 December 2010
PDF: 8 pages
Opt. Eng. 49(12) 124401 doi: 10.1117/1.3516731
Published in: Optical Engineering Volume 49, Issue 12
Show Author Affiliations
Matthias Gruber, FernUniv. in Hagen (Germany)
Michael Bohling, FernUniv. in Hagen (Germany)
Holger Winkelmann, FernUniv. in Hagen (Germany)
Hans Knuppertz, FernUniv. in Hagen (Germany)


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