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Applied Optics

Applied Optics


  • Vol. 33, Iss. 18 — Jun. 20, 1994
  • pp: 4000–4012

Application of quantitative two-line OH planar laser-induced fluorescence for temporally resolved planar thermometry in reacting flows

J. M. Seitzman, R. K. Hanson, P. A. DeBarber, and C. F. Hess  »View Author Affiliations

Applied Optics, Vol. 33, Issue 18, pp. 4000-4012 (1994)

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A temporally resolved approach for measurement of two-dimensional temperature fields in reacting flows is experimentally investigated. The method, based on planar laser-induced fluorescence of the hydroxyl (OH) radical, is applicable in many combustion environments, including variable density flow fields. As a means of examining the accuracy of the technique, temperature images, from 1300 to 3000 K and 0.4 to 3 atm, have been acquired in shock-heated H2–O2–Ar flows with a two-laser, two-image ratio scheme. A complete measurement system for producing accurate, effectively instantaneous temperature images is described; the system includes single-shot monitors for laser-sheet energy distributions and spectral profiles. Temperature images obtained with the OH A2Σ+X2Π (1, 0) P1(7)–Q2(11) transition pair exhibit a systematic error of only 7% over the entire range of conditions, with the error most likely dominated by shot-to-shot fluctuations in the lasers’ spectral profiles. The largest error source in the instantaneous temperature images is photon shot noise. A group of OH transition pairs that provide good temperature sensitivity and strong signals for reduced shot-noise error over a range of flow-field conditions is also presented.

© 1994 Optical Society of America

Original Manuscript: June 23, 1993
Revised Manuscript: November 5, 1993
Published: June 20, 1994

J. M. Seitzman, R. K. Hanson, P. A. DeBarber, and C. F. Hess, "Application of quantitative two-line OH planar laser-induced fluorescence for temporally resolved planar thermometry in reacting flows," Appl. Opt. 33, 4000-4012 (1994)

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