Abstract: A whole flowfield particle image particle image velocimetry technology for microfluidie device made by micro system technology is presented. The micro-PIV system is setup by adding an epi-fluorescence microscope and improving the light source and choosing the special type of tracing particle. According to low flow scale and high precision request, an image processing based on cross correlation algorithm is discussed. Aim at eliminating the main error caused by Brown motion of tracing particle, a method by averaging velocities of ensemble particles in the same interrogation plot is also advanced.

Key words: Brown motion, Cross correlation algorithm, DPIV, Tracing particle