快 速 响 应 压 力 敏 感 涂 料 截 止 频 率 实 验 研 究

Fast response Pressure Sensitive Paint（PSP）measurement technology has a broad application prospect in obtaining the dynamic pressure which is a key parameter of model surface. The structure the polymer binder，an important part of fast response PSP，has a decisive impact on the performance of PSP. For two types of fast response pressure sensitive paints with different branch lengths of polymer，the intensity method was used to measure the paints in a high frequency dynamic pressure optical calibration system based on sinusoidal wave. The time-domain variation results of the emission intensity of the PSP under different pressure pulsation frequencies were obtained. After filtering the measured original pressure and intensity signals，the following behaviors of the luminescent response of pressure-sensitive paints to pressure changes at different frequencies was obtained. The pressure and intensity signals were processed by fast Fourier transform to obtain the cut-off frequency of each pressure-sensitive paint. The results show that the cut-off frequencies of the two kinds of pressure sensitive paints are between 1. 8–3. 8 kHz and 4. 7–9. 0 kHz respectively. The cut-off frequency of the pressure sensitive paints is positively correlated with the branched chain length of the polymer. The measurement method used can effectively obtain the dynamic parameters of PSP. Compared with the traditional step calibration scheme，this technology can provide a reference for the calibration and application needs of PSP in engineering.