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Detection of Flame Radicals Using Light-Emitting Diodes

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Abstract:

Lasers are common tools in the field of combustion diagnostics. In some respects, however, they have disadvantages. Therefore, there is a need for new light sources delivering radiation in the required wavelength regions with high stability and reliability at low cost. Light-emitting diodes (LED) in the near- and mid-infrared spectral region have proven their potential for spectroscopic applications in the past. In the present work we demonstrate the feasibility of using ultraviolet LEDs for flame diagnostics. For this purpose, OH and CH radicals are detected in premixed methane/air flames. The LED emission is found to be stable after thermal equilibrium is reached. This was the case after a warming-up period in the order of minutes. The spectral characteristics were stable during a 24-h test.

Keywords: ABSORPTION SPECTROSCOPY; FLAME RADICAL DETECTION; LED; LIGHT-EMITTING DIODE; ULTRAVIOLET

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210793561538

Affiliations: 1: Lehrstuhl für Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, Germany; Separation Processes Laboratory, ETH Zurich, Sonneggstrasse 3, 8092 Zürich, Switzerland 2: Lehrstuhl für Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, Germany; School of Engineering, University of Aberdeen, Fraser Noble Building, Kings College, Aberdeen AB24 3UE, Scotland, UK. j.kiefer@abdn.ac.uk 3: Lehrstuhl für Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, Germany 4: Division of Combustion Physics, Lund University, P.O. Box 118, S-22100 Lund, Sweden

Publication date: December 1, 2010

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