Pressure sensitive paint with internal temperature sensing luminophore

摘要

Most pressure sensitive paints (PSP) currently being used for global pressure measurements in wind tunnels require corrections for variations in model surface temperature. Usually no temperature correction is made. If a correction is made the temperature is determined by infrared thermography or by using a temperature sensitive paint (TSP) applied in areas where no PSP has been applied. By combining in one paint a temperature sensitive luminophore which is not quenched by oxygen with another one which is quenched, a temperature measurement and correction may be made at each point where pressure is measured on the model surface. A lamp with a broad band filter which transmits the necessary excitation wavelengths for both luminophores in the paint is used for illumination. Two narrow bandpass filters are mounted in a filter shuttle in front of the camera. By means of the filter shuttle the camera alternately measures the light emitted by the two luminophores. From a calibration curve for the temperature sensing luminophore and the previously determined relationship between temperature and the Stern-Volmer slope and intercept, a temperature correction to the pressure sensitive luminophore emission intensity may be applied.