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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 21 — Jul. 20, 1998
  • pp: 4951–4962

Disturbance of laser-induced-fluorescence measurements of NO in methane–air flames containing chlorinated species by photochemical effects induced by 225-nm-laser excitation

Pascale Desgroux, Pascal Devynck, Laurent Gasnot, Jean-François Pauwels, and Louis-René Sochet  »View Author Affiliations


Applied Optics, Vol. 37, Issue 21, pp. 4951-4962 (1998)
http://dx.doi.org/10.1364/AO.37.004951


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Abstract

Laser-induced fluorescence measurements of NO in CH4–air flames seeded with CH3Cl and CH2Cl2 are described. The measurements are perturbed by strong photochemical effects characterized by UV emissions. The contribution of these background emissions is taken into account on the basis of an on-line–off-line resonance procedure. First results indicate an important increase of NO in the presence of chlorinated species. Background emissions observed in the range 220–260 nm and at 278 nm are ascribed, respectively, to electronically excited HCl and CCl photofragments. It is shown that C2H3Cl and CHCl2 species are responsible for the formation of HCl and CCl, respectively, and a photolytic mechanism for formation of the photofragments is proposed.

© 1998 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(260.5130) Physical optics : Photochemistry
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.2530) Spectroscopy : Fluorescence, laser-induced

History
Original Manuscript: August 1, 1997
Revised Manuscript: February 19, 1998
Published: July 20, 1998

Citation
Pascale Desgroux, Pascal Devynck, Laurent Gasnot, Jean-François Pauwels, and Louis-René Sochet, "Disturbance of laser-induced-fluorescence measurements of NO in methane–air flames containing chlorinated species by photochemical effects induced by 225-nm-laser excitation," Appl. Opt. 37, 4951-4962 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-21-4951

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