Some X-ray imaging techniques are examined for a feasibility study for micro-PIV in this study . There are three X-ray imaging method, the absorption contrast method , the refraction contrast method, and the phase contrast method. The first one is a common method but its spatial resolution is rather poor. The 2nd method corresponds to the Schlieren method that utilizes refraction of parallel light. The characteristics of the method, edge enhancement, can be effective in extracting tracer

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... The third method is a kind of holography methods, and this method can record fine tracer particles. Among the three methods, the second and the third method are seemed to be applicable to PIV imaging, and those methods need a parallel X-ray. The Spring8, the synchrotron radiation facility in Harima, is utilized. There are some methods to realize phase contrast image , most of them requires ultra-high precision in optical alignment. In the present study, though a coherent source is indispensable, the simplest and robust holography method, the inline holography , is used to take phase contrast pictures.