The effect of particle shape in particle detection using inductive sensors

Abstract

Inductance sensor is one of the commonly used methods in the detection of oil metal particles. The shapes of particles are different, caused by the different forms of wear in oil; however, the effect of particle shapes on the inductive sensors was not under consideration. In order to obtain more accurate measurement results of inductive sensors in metal particle detection and other areas of application, the effect of particle shapes on an inductive sensor is studied in this paper. The inductance change of coil about the ratio of long axis to short axis of particles is obtained in accordance with the experimental validation depending on the cylindrical particles. The results show that the inductance changes are 0.25 nH, 0.32 nH, and 0.92 nH with the ratios of long axis to short axis of particles l/d are 0.67, 1, and 3 with the same volume. It is observed that the inductance change of coil ΔL increases with an increasing ratio of long axis to short axis of particles l/d, which provides a theoretical basis for inductive sensors in metal particle detection and other areas of application.