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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 36, Iss. 21 — Nov. 1, 2011
  • pp: 4182–4184

One-dimensional single-shot thermometry in flames using femtosecond-CARS line imaging

W. D. Kulatilaka, H. U. Stauffer, J. R. Gord, and S. Roy  »View Author Affiliations


Optics Letters, Vol. 36, Issue 21, pp. 4182-4184 (2011)
http://dx.doi.org/10.1364/OL.36.004182


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Abstract

We report single-laser-shot one-dimensional thermometry in flames using femtosecond coherent anti-Stokes Raman scattering (fs-CARS) line imaging. Fs-CARS enables high-repetition-rate ( 1 10 kHz ), nearly collision-free measurement of temperature and species concentration in reacting flows. Two high-power 800 nm beams are used as the pump and probe beams and a 983 nm beam is used as the Stokes beam for CARS signal generation from the N 2 Q-branch transitions at 2330 cm 1 . The probe beam is frequency-chirped for single-laser-shot imaging. All three laser beams are formed into sheets and crossed in a line which forms the probe region. The resulting 1D line-CARS signal at 675 nm is spatially and spectrally resolved and recorded as a two-dimensional (2D) image. Single-shot temperature measurements are demonstrated in flat-field flames up to temperatures exceeding 2000 K , demonstrating the potential of fs-CARS line imaging for high-repetition-rate thermometry in turbulent flames. Such measurements can provide valuable data to validate complex turbulent-combustion models as well as increase the understanding of the spatio-temporal instabilities in practical combustion devices such as modern gas-turbine combustors and augmentors.

© 2011 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:
Spectroscopy

History
Original Manuscript: July 13, 2011
Revised Manuscript: September 24, 2011
Manuscript Accepted: September 25, 2011
Published: October 21, 2011

Citation
W. D. Kulatilaka, H. U. Stauffer, J. R. Gord, and S. Roy, "One-dimensional single-shot thermometry in flames using femtosecond-CARS line imaging," Opt. Lett. 36, 4182-4184 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-21-4182

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