What are the main problems with sonography?

Ultrasonic particle size measurement can prevent the particle size measurement due to its high particle concentration, wide measurement range, and non-contact.Pollution prevention has attracted widespread attention, and Germany (Sympatec Company) and the United States (DT Company) have developed

Corresponding instruments have been studied by the University of Shanghai for Science and Technology in China since 1999, and great progress has been made. Currently, the strength of this method lies in the in-line particle size measurement. Sound attenuation is due to absorption and scattering, the absorbing machine The theory is very complex: including heat loss, viscosity, absorption mechanism, mechanism and electroacoustic loss, etc., which have not yet been solved.

A simple and complete theory to solve this problem. A theoretical model such as ECAH requires many parameters: density, compression

Wave velocity, shear particle size, shear modulus, thermal conductivity, specific heat capacity, sound absorption coefficient, thermal expansion coefficient, etc., Only a few substances such as water, iron, aluminum, etc. are well known for the above parameters, while most of the tested substances

It is very difficult to measure these parameters, and some are even impossible to measure. Therefore, the accuracy of sonography

Compared with other particle size analysis methods, it has certain uncertainties, and the method itself has its insurmountable defects.