Pressure sensitive paint application in low-speed flows

Pressure field measurements on a wing profile are conducted to evaluate the accuracy of measurement system using Binary Pressure Sensitive Paint (PSP) for low speed (40-60 m/sec) environments. A part of the wing surface was coated with binary paint B1 from Optrod Ltd. Two different light sources, a Xenon - flash lamp and a nitrogen-laser were used for paint excitation and the resulting fluorescence fields in two spectral band length were acquired by 16 bit CCD slow scan camera with appropriate filters. Results shows that the optical pressure measurement system with binary paint can achieve pressure resolution better than 1 mbar.