A relatively new approach to surface pressure measurement using PSP (Pressure Sensitive Paint) was investigated. PSP has the ability to generate accurate, spatially continuous pressure distribution and has a number of advantages in comparison to the conventional pressure tap method. In the present study, PSP measurement system including the calibration facility was installed and several methods to improve the resolution of the PSP measurement were examined. Calibration was performed in the a priori calibration chamber, and the pressure measurement was made in an impinging jet flow. The effects of several error sources were quantitatively calculated. Subtracting of dark current noise reduced 30.6% of the rms error in the pressure distribution. 63.8% of the rms error was reduced with the base-coating in comparison to the case without the base-coating. Additionally, it was found that image averaging and optimal exposure were important to improve the resolution. The resolution of the CCD camera was also important. Rms error of the pressure fluctuation with 12bit CCD camera was 59.1% smaller than that with 8bit CCD camera.
