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Pressure-sensitive paint (PSP) relates a static or oxygen pressure in a testing fluid to a luminescent signal. It uses a photophysical process of oxygen quenching [Lakowicz]. A PSP measurement system requires an illumination source to excite the PSP that can be a xenon lamp, an LED array, and a laser. These are a point illumination that creates a distribution of the illumination on a PSP coated surface. This distribution results in a pressure-independent luminescence from the PSP surface. By rationing with a reference image, the pressureindependent luminescence is cancelled [Liu and Sullivan]. The reference image is obtained under a constant pressure. It is only related to the pressure-independent luminescence mainly due to the distribution of the illumination and a movement and/or distortion in a testing article. The rationing method is valid when there is no movement and/or distortion in the article. If there is such a case, a misalignment of the images may occur that causes a substantial error to a PSP measurement. In addition to the illumination problem, a PSP in general has a temperature dependency [Liu and Sullivan]. This also creates an error to a PSP measurement. For example, a platinum-porphyrin based PSP changes about 1% of the luminescent signal by 1 C change in temperature. This is equivalent to the 1 kPa change in the luminescence signal.

Electro-Luminescence Based Pressure-Sensitive Paint System and Its Application to Flow Field Measurement