Research on the effect of relative movement on the output characteristic of inductive sensors

The metallic objects are commonly detected in the inductive sensors with relative movement including reciprocation and rotation. However the effect of the relative movement on the inductive sensors was not in consideration. In order to improve the sensitivity of inductive sensors in metal particle detection and other areas of application, the effect of particle movement on inductive sensor is studied. A theoretical analysis is presented, in accordance with the experimental validation depending on the velocity of copper particles. It results that the absolute value of the inductance variation of the copper particle is up to 0.1005 nH at the velocity 2.9 × 10−2 m/s, in comparing with 0.0593 nH at the velocity 5.8 × 10−3 m/s, with a 69.48% improvement on the sensitivity, which is indicated that the sensitivity of the inductive sensor is improved by the velocity of copper particle.