To design more efficient chemical reactors, fuel cells, or micro-TAS, it is important to understand the behavior of oxygen concentration relates to chemical reactions in devices. In small systems, commonly used oxygen probes such as galvanic cell type cannot be used for unsteady oxygen concentration measurements, because such probes have long response time and large probe head. In this study, we have focused on the pressure-sensitive paint (PSP) technique, and tried to apply the PSP technique to oxygen concentration measurement in small systems. The PSP technique enables us to measure 2-dimenstional oxygen concentration distribution, since PSP is based on oxygen quenching of luminescent molecules. Moreover, the time response of PSP is of the order of milliseconds. As an application of oxygen concentration measurement technique using PSP, we measured the concentration of mixing channel and clarified the effect of inlet Reynolds number on flow structures.

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