Evaluasi Induktansi Eddy Current Sensor Berbasis Planar Coil Dengan Variasi Sudut Terhadap Ketebalan Pelat Logam

Abstract

This study reports the design of metal plate thickness sensor based on Eddy Current principal in the form of planar coil that could work without direct contact on the object. The principle used in the Eddy Current sensor is a change of coil mutual inductance due to the presence of object in the magnetic field. The coil is made up of double layered coil with angle variation between each layer designed using and EAGLE Autodesk software based on FR-4 printed circuit board (PCB) material with the number of turn (n) 24 turn, 31.4 mm outer diameter, and 2 mm inner diameter. Coil inductance evaluation are carried out using LDC 1000 EVM which converts inductance values to digital data. The smallest inductance (L) value obtained from 45º coil of L = 47,93 μH and the highest inductance value obtained from double layered coil without angle variation of L = 53,12 μH which obtained using Aluminium metal plate with 1 mm thickness as the test object.