Inductive tangential displacement sensor

The objective of this paper is to investigate a new design of an inductive sensor, and its application for measuring tangential displacement. The sensor consists of one stationary inductor and a movable ferrite plate relative to the inductor. Tangential displacement can be measured as a change in the overlapping area between the inductor and the ferrite plate, while their normal distance is constant. The inductance of the inductor changes, so does the resonant frequency of the antenna-sensor system when the ferrite plate moves in one - x axis direction with respect to the stationary inductor. The operating principle of the sensor is tested using the fabricated prototype. The resonant frequency of the system is wirelessly measured. The obtained sensitivity of the planar tangential inductive displacement sensor is 2.44 MHz/mm.