Calibration of Fast-Responding Pressure-Sensitive Paint in Near-Vacuum

Two types of fast-responding pressure-sensitive paint(PSP) were prepared:PSP-I comprised a PtTFPP luminophore and a binder of highly oxygen permeable poly(TMSP);PSP-II used a PtTFPP luminophore but a different binder of polymer-ceramics.The influence of the binder properties on the pressure sensitivity and temperature dependency was investigated in near-vacuum environment with the lab-built calibration platform.The calibration results show that PSP-I significantly outperform PSP-II because of a much higher pressure sensitivity(44.0%/kPa) and a fairly lower temperature dependence(-0.29%/K).Moreover,white undercoat and oil vapor seriously reduced the pressure sensitivity of PSP-I because white-undercoat strongly decreased permeability of oxygen though it enhanced the luminescent intensity,and because deposition of oil film considerably contaminated PSP-I.For instance,storage in non-lubricated-oil-free vacuum chamber for 48 h decreased the pressure sensitivity by 20%.Nevertheless,storage in air little affects the pressure sensitivity.