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Spectral interferences from formaldehyde in CH PLIF flame front imaging with broadband B-X excitation

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Author

Summary, in English

In this letter we show that the use of slightly broadband laser sources like multimode alexandrite lasers for CH PLIF bears the danger of interferences from formaldehyde. Such interferences occur when the laser frequency is not carefully tuned to the B-X (0,0) R-branch band head at around 387.2 nm and manifest either in the appearance of an additional layer in the PLIF image or in a slight broadening of the actual CH layer. With careful frequency selection the formaldehyde signals were not observed. Suppression of the interferences is feasible by employing appropriate spectral filters. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Department/s

Publishing year

2011

Language

English

Pages

583-585

Publication/Series

Combustion and Flame

Volume

158

Issue

3

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • CH radical
  • PLIF imaging
  • Flame front
  • Formaldehyde

Status

Published

ISBN/ISSN/Other

  • ISSN: 0010-2180