Design of a Noncontact Passive LC-Based Level Sensor With a Readout System

In this article, a noncontact-type wireless and passive level sensor has been presented based on LC sensing technique. A novel low-cost and handy readout mechanism has also been proposed here. In the proposed method, LDC1000 has been used to measure the sensing parameter remotely. The designed level sensor consists of a coplanar capacitor which varies with the changing level inside any container. A planar spiral inductor has been used as the reader coil. The change in level varies the fringing field around the capacitor, which changes the capacitance value. The change in capacitance, indicating the changing in level, is measured with impedance analyzer in terms of resonating frequency and real part of the input impedance. The experiment of the level sensor has also been performed with LDC1000-based readout system, which validates the concept of the proposed system. The proposed technique has also been evaluated analytically to deduce the measuring component as a function of the sensing parameter.