This work identifies a new fluorescent tracer, 5(&6) carboxy-dichlorofluorescein, suitable for use with a Nd:YAG laser for quantitative PLIF concentration measurements in aqueous-phase flows. Fluorescence emission calibrations are performed to validate the use of this laser/dye combination, and to reject other combinations examined. It is found that the commonly used sodium fluorescein dye has a non-linear signal response when excited by the Nd:YAG laser, which makes this laser/dye combination unsuitable for quantitative PLIF measurements, although it is acceptable for purely visualization purposes. The new proposed dye shows a linear response of fluorescent signal both with dye concentration and with laser intensity. Fluid-flow measurements taken with the Nd:YAG/carboxy-dichlorofluorescein system are found in agreement to measurements obtained using a more standard laser/dye combination, namely Copper-vapor with sodium fluorescein, for which signal calibrations tests are also presented.
Experiments in Fluids – Springer Journals
Published: Nov 19, 1997
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