Investigation on Non-Uniformity of Luminescence Lifetime of Fast-Responding Pressure-Sensitive Paint

Abstract

Lifetime imaging of pressure-sensitive paint (PSP) does not theoretically require wind-off reference images that intensity method needs to compensate for the non-uniformity of illumination and painting of PSP. The absence of the need for a reference image is an excellent advantage of the lifetime method because it can eliminate the errors caused by image registration between wind-off and wind-on images and the model’s deformation and movement during the measurement. However, it is reported that the luminescence lifetime of PSP is not spatially uniform on the model, even under uniform conditions of pressure and temperature. In particular, the fast-responding PSP has a considerable variation in the luminescence lifetime compared to the conventional polymer-based PSP. In this study, we have investigated and discussed the effects of the luminophore solvents, luminophore concentration, binder thickness, and spraying conditions on luminescence lifetime. The results revealed that the planar and depth variations in the luminophore distribution in the PSP layer and binder structure caused the non-uniformity of the luminescence lifetime.