Fluid Mechanics and Acoustics Laboratory - UMR 5509

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pH measurements using inhibited fluorescence


Context: Planar Laser Induced Fluorescence methods allow the local, instantaneous and multi-point measurement of a scalar quantity of the flow (Concentration, temperature, pH ...). When applied to non optically thin systems or multiphase flows, absorption issues make it impossible to deduce the scalar value from only the measurement of fluoresced light intensity: the knowlege of localr excitation intensity is also required.

Objective: Development of a pH sensitive, Inhibited PLIF method applicable to multiphase flows, complex fluids, and non optically thin systems.

Method: Spectrofluorimetric characterisation, In-situ calibration in simple (water) and complex fluids (dilute polymer solutions), application to monophasic (jet) and diphasic (bubble) test flows.

Key words::Fluorescence, pH, Laser, Chemical reaction, Micromixing

LMFA: M. El Hajem, S. Simoëns, J-Y. Champagne
INL: J.M. Bluet



T. Lacassagne, S. Simoëns, M. E. Hajem, et J.-Y. Champagne, Ratiometric, single-dye, pH-sensitive inhibited laser-induced fluorescence for the characterization of mixing and mass transfer , Exp. Fluids, vol. 59, no 1, p. 21, janv. 2018.


T.Lacassagne, A. Femat-Ortiz, S.Simoëns, M.El Hajem, J-Y.Champagne, pH and dissolved gas concentration measurement by ratiometric inhibited Planar Laser Induced Fluorescence, Congrès Francophone de Techniques Laser (Francophone conference on Laser based techniques for fluid mechanics), CFTL 2018, Dourdan, France, 17 – 21 September 2018

T.Lacassagne, A. Femat-Ortiz, S.Simoëns, M.El Hajem, J-Y.Champagne, Micormixing measurement by a pH inhibited two fluorescence wavelength planar laser induced fluorescence technique, Optique Toulouse 2018, Toulouse, France, France, 03-06 juillet 2018

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