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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 23 — Aug. 10, 2014
  • pp: 5246–5251

Continuous hydroxyl radical planar laser imaging at 50  kHz repetition rate

Stephen Hammack, Campbell Carter, Clemens Wuensche, and Tonghun Lee  »View Author Affiliations


Applied Optics, Vol. 53, Issue 23, pp. 5246-5251 (2014)
http://dx.doi.org/10.1364/AO.53.005246


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Abstract

This study demonstrates high-repetition-rate planar laser-induced fluorescence (PLIF) imaging of hydroxyl radicals (OH) in flames at a continuous framing rate of 50 kHz. A frequency-doubled dye laser is pumped by the second harmonic of an Nd:YAG laser to generate laser radiation near 283 nm with a pulse width of 8 ns and rate of 50 kHz. Fluorescence is recorded by a two-stage image intensifier and complementary metal-oxide-semiconductor camera. The average power of the 283 nm beam reaches 7 W, yielding a pulse energy of 140 μJ. Both a Hencken burner and a DC transient-arc plasmatron are used to produce premixed CH4/air flames to evaluate the OH PLIF system. The average signal-to-noise ratio for the Hencken burner flame is greater than 20 near the flame front and greater than 10 further downstream in a region of the flame near equilibrium. Image sequences of the DC plasmatron discharge clearly illustrate development and evolution of flow features with signal levels comparable to those in the Hencken burner. The results are a demonstration of the ability to make high-fidelity OH PLIF measurements at 50 kHz using a Nd:YAG-pumped, frequency-doubled dye laser.

© 2014 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3600) Lasers and laser optics : Lasers, tunable
(300.2530) Spectroscopy : Fluorescence, laser-induced
(140.3538) Lasers and laser optics : Lasers, pulsed

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 7, 2014
Manuscript Accepted: June 16, 2014
Published: August 8, 2014

Citation
Stephen Hammack, Campbell Carter, Clemens Wuensche, and Tonghun Lee, "Continuous hydroxyl radical planar laser imaging at 50  kHz repetition rate," Appl. Opt. 53, 5246-5251 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-23-5246

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