Abstract
In this paper, three-dimensional movements of the particles inside the SHM were visualized by a wide range defocusing-particle-image velocimetry (WDPIV). The radius changes of the defocusing particle images at different defocusing distances were recorded, and by correlating the images with the defocusing distances, the three dimensional location of the particles inside micro-fluidic device can be estimated. This system can extract three dimensional informations through simple setup and provid in situ information about the geometric effects of the SHM. © 2009 CBMS.