3D visualization of the microscopic characteristic in Magnetorheological fluids

The 3D microstructure and the rheology of Magnetorheological (MR) fluids are investigated using digital micro holography. A digital micro holographic system which can measures the rheological mechanism of MR fluids is presented. To accurately locate the focal plane of the particles in MR Fluids in digital holography, the overall-sharpness method is introduced which can effectively eliminate the noise on the focal plane determination. The two-threshold and image segmentation methods were used to obtain high quality binary images from which we can get satisfied measurement results of particle size and chain structure. The size distributions and the 3D visualization of microscopic characteristic of MR fluids are effectively measured. The experiment results show the digital holography is a well tool for measurement of the behaviors of MR fluids.