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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 6 — Feb. 20, 2001
  • pp: 748–756

Two-line laser-induced fluorescence imaging of vibrational temperatures in a NO-seeded flame

Wolfgang G. Bessler, Frank Hildenbrand, and Christof Schulz  »View Author Affiliations


Applied Optics, Vol. 40, Issue 6, pp. 748-756 (2001)
http://dx.doi.org/10.1364/AO.40.000748


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Abstract

Two-dimensional temperature fields are measured in lean and sooting flames by means of two-color laser-induced fluorescence (LIF) imaging that uses seeded NO. Vibrational thermometry is performed by the probing of different vibrational ground-state levels. Spectral properties of the excited transitions within the A2Σ+X2Π system are well known from previous studies. The energy difference of 1974 cm-1 between the (0,0)Q1 + P21(33.5) and the (0,2)O12(5.5) lines offers great sensitivity in the temperature range that is relevant for combustion processes. Excitation is possible by use of a tunable KrF excimer laser on its fundamental (248-nm) and Raman shifted (in H2, 225-nm) wavelengths. An excitation scheme for instantaneous two-line measurements by use of a single laser is developed. The possibility of single-shot measurements is discussed.

© 2001 Optical Society of America

OCIS Codes
(140.2180) Lasers and laser optics : Excimer lasers
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6360) Spectroscopy : Spectroscopy, laser

History
Original Manuscript: May 17, 2000
Revised Manuscript: August 21, 2000
Published: February 20, 2001

Citation
Wolfgang G. Bessler, Frank Hildenbrand, and Christof Schulz, "Two-line laser-induced fluorescence imaging of vibrational temperatures in a NO-seeded flame," Appl. Opt. 40, 748-756 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-6-748

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