Abstract
Recently, Pressure Sensitive Paint Technique (PSP) has been being developed to measure 2-dimensional pressure filed quantitatively. It has been applied to aerodynamics due to high spatial resolution and low cost. However, it cannot reduce the effect of temporal illumination light source variation and it is hardly applicable to moving test surface to be measured. Furthermore, pressure sensitive dyes generally depend strongly on temperature as well. It, therefore, has been quite difficult to apply it to thermal acoustic phenomenon, which is caused by the interaction between pressure and temperature. In the present study, 2-Color Laser Induced Fluorescence method is proposed, in which 2 dyes are used to simultaneously obtain two fluorescence-intensity images emitted at different wavelength. Hence, this can resolve some above-mentioned problems of PSP, i.e. the reduction of illumination noise and applications to moving body. Some promising dyes were investigated to apply to this technique. Consequently, PtTFPP and Pyrromethene 546 combination was found to enhance temperature sensitivity, resulting in one of the best temperature sensitive paint (TSP). In the combination of Ru(dpp) and Pyrromethene 546, its fluorescence intensity at green range becomes more blunt, so temperature-independent pressure sensitive paint can be instrumented.
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