Abstract
The micro-PIV technique has been limited in two-dimensional velocity measurement. In order to measure instantaneous three-dimensional velocity distributions in a small space, three-dimensional micro-PIV technique have to be developed. In this paper, a new imaging method that could be conveniently applied to the three-dimensional measurement is discussed. The eccentric aperture method can measure three-dimensional position of particles using a one camera. By introducing a color separation technique to the existing method, the performance of the new method can be expanded twice, and it can process dense tracer pictures. The spatial resolution of the method is about 9.6 μm in z-direction. Some experimental examples are shown as well as the theoretical explanations.
