Flow fields around a swimmer are extremely unsteady. Top swimmers are supposed to swim using unsteady flow force effectively. PIV can visualize the unsteady flow field around swimmer`s hand. A motion analysis can analyze the unsteady motion of swimmer quantitatively. Our main aim is to construct a synchronized system of the two methods, and to apply it to a front crawl swimmer, in order to clarify the relationship between swimmer's hand motion and the vortex generated by hand. To combine two methods, we illuminated swimmer`s hand with the red lights, and separated the lights by passing it through Laser Line Band Pass Filter and Red Band Pass Filter for PIV and for High-speed camera, respectively. To synchronize two types of images, we utilized the first shutter timing of a pulse generator and set the shutter period to 72ms in PIV and 8ms in a motion analysis.
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