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Scalar concentration measurements in liquid-phase flows with pulsed lasers

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An Erratum to this article was published on 24 June 2004

Abstract

The suitability of pulsed lasers for laser-induced-fluorescence (LIF) measurements of the local concentration of scalars in liquid-phase flows is investigated. Experiments were performed to measure the fluorescence intensity of aqueous solutions of rhodamine-6G chloride excited by a Q-switched, frequency-doubled, Nd:YAG laser. The fluorescence intensity is found to be linear with dye concentration, but not with illumination power density. The fluorescence intensity saturates at laser power densities easily exceeded by short-pulse-duration lasers. A procedure for calibrating and normalizing the raw image data is discussed which relies only on weak absorption and the linearity of fluorescence intensity with concentration. This procedure enables quantitative concentration measurement with pulsed-laser-induced fluorescence.

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Acknowledgements

We thank Daniel Gargas and Jimmy Fung who helped develop the instrumentation and data acquisition software used for this experiment. Additionally, we thank Manooch Koochesfahani for useful discussions. This work was supported by the Air Force Office of Scientific Research (F49620-98-1-0052 and F49620-01-0006) and the California Institute of Technology John K. Northrop Chair.

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Author notes

  1. Jerry W. Shan

    Present address: Department of Mechanical and Aerospace Engineering, Rutgers—The State University of New Jersey, Piscataway, NJ, 08854, USA

Authors and Affiliations

  1. Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA

    Jerry W. Shan, Daniel B. Lang & Paul E. Dimotakis

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  1. Jerry W. Shan
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  2. Daniel B. Lang
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  3. Paul E. Dimotakis
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Correspondence to Jerry W. Shan.

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An erratum to this article is available at http://dx.doi.org/10.1007/s00348-004-0817-z.

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Shan, J.W., Lang, D.B. & Dimotakis, P.E. Scalar concentration measurements in liquid-phase flows with pulsed lasers. Exp Fluids 36, 268–273 (2004). https://doi.org/10.1007/s00348-003-0717-7

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