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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 9 — Mar. 20, 2006
  • pp: 2089–2100

Two-photon nitric oxide laser-induced fluorescence measurements in a diesel engine

Glen C. Martin, Charles J. Mueller, and Chia-Fon F. Lee  »View Author Affiliations


Applied Optics, Vol. 45, Issue 9, pp. 2089-2100 (2006)
http://dx.doi.org/10.1364/AO.45.002089


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Abstract

A two-photon nitric oxide (NO) laser-induced fluorescence (LIF) technique was developed and applied to study in-cylinder diesel combustion. The technique prevents many problems associated with in-cylinder, single-photon NO planar-laser-induced fluorescence measurements, including fluorescence interference from the Schumann–Runge bands of hot O2, absorption of a UV excitation beam by in-cylinder gases, and difficulty in rejecting scattered laser light while simultaneously attempting to maximize fluorescence signal collection. Verification that the signal resulted from NO was provided by tuning of the laser to a vibrational off-resonance wavelength that showed near-zero signal levels, which resulted from either fluorescence or interference at in-cylinder pressures of as much as 20 bar. The two-photon NO LIF signal showed good qualitative agreement with NO exhaust-gas measurements obtained over a wide range of engine loads.

© 2006 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Spectroscopy

History
Original Manuscript: May 20, 2005
Revised Manuscript: October 11, 2005
Manuscript Accepted: October 28, 2005

Citation
Glen C. Martin, Charles J. Mueller, and Chia-Fon F. Lee, "Two-photon nitric oxide laser-induced fluorescence measurements in a diesel engine," Appl. Opt. 45, 2089-2100 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-9-2089

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