Time response of anodized aluminum pressure-sensitive paint

The response time of anodized aluminum pressure-sensitive paint (AA-PSP) was studied to develop the capability of making global pressure measurements in unsteady flow conditions. This pressure-sensitive paint (PSP) uses anodized aluminum as a porous supporting matrix, which improves the response time by increasing the oxygen diffusion process in the PSP layer. A response time of 34.8 μs was obtained from AA-PSP with 4.3-μm matrix thickness. Response times of PSPs were measured from a step change of pressure created by a normal shock wave in a shock tube. The response time of AA-PSP is dependent on the matrix thickness, with a thin supporting matrix giving a fast response time. The increase in surface temperature of the paint caused by shock waves was also measured using a temperature-sensitive paint (rhodamine-B on anodized aluminum) to understand the temperature effect of AA-PSP