Preparation and Properties of Novel Aerodynamic Pressure-sensitive Paint Via the Sol-gel Method

A novel aerodynamic pressure-sensitive paint (PSP) was prepared by using the sol-gel process for measuring the pressure distribution variation on an aerodynamic surface with an oxygen-containing gas flow. In this PSP, RuII complexes as oxygen-sensitive probe molecules excited with visible light of 436 nm were dispersed into the organic modified silica matrix film prepared by the sol-gel method. A linear relationship between the emission intensity and the oxygen partial pressure was achieved in the airflow pressure range of 10.1–405 kPa, and the slope that represents the sensitivity of PSP for oxygen quenching reaches 0.75. A pressure distribution map was demonstrated showing a spatial resolution of 0.25 mm.