Research on spatial motion of ultrasonic speckles back-scattered from an interface in motion;

First-order statistical properties of ultrasonic speckles back-scatteredfrom a kind of weak scattering interface;

The principles of ultrasonic speckle digital correlation method is proposed based on the theorem of laser speckle digital correlation method, and an analysis experimental system of ultrasonic speckle digital correlation was built up.

Speckle compressing algorithm of preserving the geometrical features and suppressing speckle noise in images;

Comparison and discussion about Lee althorithm and wavelet threshold althorithm using speckle noise reduction;

By applying multi-scale principle of wavelet transform and curvelet transform,the zero-order diffraction spot is eliminated,and the speckle noise is reduced effectively while more edge information of object is maintained.

The contact mass prepared with ultrasonic dispersion method was proved to hold higher activity than that of prepared with simple mixing method.

A PVDF/Polyacrylate composite emulsion was prepared by emulsion polymerization using mixture of polyvinylidene fluoride,methyl methacrylate and butyl acrylate monomers in presence of fluorine-containing surfactant by ultrasonic dispersion process.

The influence of ultrasonic dispersion time,seed type and DVB concentration were discussed.