Pressure field measurements on a wing profile are conducted toevaluate the accuracy of a measurement system using the so called“binary” or “two-color” Pressure Sensitive Paint(PSP) for low-speed (40-60 m/sec) environments. A part of the wingsurface was coated with a binary paint. Two different light sources, ahigh pressure Xenon-flash lamp and a nitrogen laser were used for theexcitation of the paint. The resulting fluorescence fields were acquiredby a 16-bit CCD slow-scan camera. In front of this camera two differentoptical devices, a filter-shifting system or alternative abeam-splitting system, each of them were equipped with appropriateoptical filters to separate the two different spectral emissionwavelength of the paint, were used. Results shows that this opticalpressure measurement system is able to resolve the small pressurechanges on the model surface. Due to model movement and modeldeformation in between the image acquisition of the“wind-off” and “wind-on” images the necessity touse a binary paint for precise pressure measurements is clearly visible.These PSP-System working with binary paint can achieve pressureresolution in the region of 1 mbar
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