Temperature sensitivity elimination in sprayable fast-responding pressure-sensitive paint

Abstract

Temperature-induced error is a major issue in pressure-sensitive paint (PSP) measurement, which usually comes from the inherent thermal quenching effect of luminophores. Herein, we successfully eliminate the temperature sensitivity in a sprayable fast-responding PSP. This PSP contains two luminophores (coumarin 6 and PtTFPP) with opposite temperature sensitivities, which cancel the temperature effect in the 515–800 nm spectral range, making it a temperature-canceled PSP (TC-PSP). The sensing properties of the TC-PSP (pressure sensitivity, temperature sensitivity, signal level, and response time) are characterized and compared with those of a single-luminophore PSP with the same mesoporous particle binder (MP-PSP). The TC-PSP exhibits an extremely low temperature sensitivity of 0.015 %/℃ in the 20–60 ℃ range, a value approximately 1 % that of the MP-PSP (1.35 %/℃). Its temperature sensitivity and corresponding temperature-induced error are significantly lower than the previously reported temperature-insensitive fast PSPs. In a jet impingement experiment conducted for validation, the TC-PSP showed excellent performance in eliminating the temperature-induced error. Overall, the developed TC-PSP holds great potential for high-speed aerodynamic testing applications. • We developed a sprayable fast PSP with extremely low temperature sensitivity. • The PSP contains two luminophores with opposite temperature sensitivities. • Temperature-induced error is completely removed in a jet impingement experiment.