Methods An ARM embedded system was used to measure the speed of ultrasound,the broadband ultrasound attenuation(BUA) and the stiffness.

Pulse-echo based ultrasonic attenuation model for porosity test of carbon fiber composites;

Ultrasonic attenuation coefficient of the spray-atomized and co-deposited 6061Al/SiCp composite;

Ultrasonic attenuation technique is used to investigate a method to measure mass concentration of paper fibers in dilute pulp suspensions.

Based on analyzing the theoretical model of ultrasonic attenuation, the formula was integrated into the ultrasonic attenuation model, and the relation of ultrasonic attenuation to pulp density and particle size was derived.

A formula is proposed for calculating the sand content of different size in the case of matching particle size of sand,thus obtaining the correlation between ultrasonic attenuation and density of solid particles in the pulp,as well as particle size.

An ultrasonic path length-variation device was used to measure the pulsed ultrasonic attenuation spectrum of 2% nano-ATO dispersions at 25 ℃,and the McClements theoretical model coupled with the BLBL theoretical model were selected to describe simultaneously the ultrasonic attenuation spectrum of nano-ATO particles in dispersion.