Effect of dye solvents of fast-responding pressure-sensitive paint on the binder structure and the uniformity of luminescence lifetime

Abstract

Among pressure-sensitive paint measurement techniques, the lifetime imaging method is attracting attention because it can measure pressure distribution only from wind-on images without wind-off ones. It can prevent an error caused by the image registration between wind-off and wind-on ones. The luminescence lifetime of PSP is expected to be uniform on the model under uniform pressure and temperature conditions. However, it is not actually uniform and is a major error factor in the lifetime imaging method. Therefore, we have investigated the causes of the non-uniform distribution of the luminescence lifetime of PSP on the model. Especially we focused on the effect of dye solvents on the binder structure and the uniformity of luminescence lifetime. The obtained results revealed that, the standard deviation of the luminescence lifetime was lowered when the mixing ratio of the polymer dissolving solvent was increased. This is because the dye was more uniformly distributed in the polymer.