Pressure sensitive paint (PSP) technique have shown their superiorities in the capability of large coverage area and high spatial resolution. The process of PSP technique usually requires sufficient illumination that covers the entire test object and camera that acquires the particular excited fluorescence. Applications on internal flow study like compressor cascade may fail as the optical access is heavily limited due to the closely adjacent components, which puts forward a high demand for spatial positioning arrangement of optical devices in the visualization system. In this work, a pre-positioning method was proposed to help determine the arrangement of optical devices of internal flow PSP measurement system in advance. And it was applied to the measurement for a linear compressor cascade with large solidity. The results showed that with the optical layout arrangement determined using this pre-positioning method, a full-field pressure distribution of cascade blade can be acquired successfully.
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