METHOD FOR DETECTING SMALL PARTICLES IN A TANK AND AN APPARATUS FOR CARRYING OUT THE SAME

摘要

An ultra-sonic transmitting means and an ultra-sonic receiving means are provided in fluidized region of a tank at a fixed interval. An ultra-sonic wave is transmitted from the transmitting means to the receiving means and bubbles are prevented from entering the space between the transmitting means and the receiving means, and the presence or absence of small particles is detected by measuring the attenuation of the ultra-sonic wave.