METHOD FOR DETECTING SMALL PARTICLES IN A TANK AND APPARATUS FOR CARRYING OUT SAID METHOD

摘要

The existence of small particles in a tank is detected by providing a pair of electrodes in the tank containing the particles to be detected, applying across the electrodes a frequency voltage high enough to occur dielectric dispersion in the particles, and measuring the changes in impedance caused by the existence of the small particles in the space between the electrodes which changes occur as a result of the changes in the real part of the dielectric constant of the particles and the imaginary part thereof resulting from dielectric dispersion. In a case where the size of the tank is large, the detection of the existence of the small particles is performed by forming a distribution resonant circuit using the distributed constants existing in the electrodes or the lead wires extending therefrom and detecting the change of the standing wave thereon.