A fluorescence technique for measurement of concentration in mixing liquids

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Abstract
Previous researchers have observed turbulent transport of scalars in liquid jets by fluorescence. However, the technique has not been thoroughly investigated. This work examines a fluorescence technique in detail. Fluorescein sodium in a buffer solution was used in bench tests and in an experimental jet flow. Instrumentation and properties of the dye were considered. The author measured the variation of fluorescence intensity with temperature, pH, concentration and laser intensity. Concentration of reaction product in an acid-base reaction by laser-induced fluorescence is also discussed. The distinction between requirements for qualitative flow visualisation and for quantitative concentration measurements was clarified.