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Scalar concentration measurements in liquid-phase flows with pulsed lasers

Shan, Jerry W. and Lang, Daniel B. and Dimotakis, Paul E. (2004) Scalar concentration measurements in liquid-phase flows with pulsed lasers. Experiments in Fluids, 36 (2). pp. 268-273. ISSN 0723-4864. doi:10.1007/s00348-003-0717-7.

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he 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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Additional Information:© 2003 Springer-Verlag. Received: 23 December 2002 / Accepted: 27 August 2003. 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.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0052
Air Force Office of Scientific Research (AFOSR)F49620-01-0006
Caltech John K. Northrop ChairUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20160602-163406315
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67604
Deposited By: Paul Dimotakis
Deposited On:13 Jun 2016 16:07
Last Modified:11 Nov 2021 03:51

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