Paper Title
Femm Based Magnetic Modeling of an Eddy Current Displacement Sensor Coil-Core Assembly

Abstract
This paper presents a detailed electromagnetic simulation-based study of an eddy current displacement sensor designed for 1 mm range and 100 nm resolution. The study explores the effect of varying core materials (including air-core and ferrite-core), core geometries, and coil configurations such as the number of turns, layers, and conductor materials. Simulations are conducted using the FEMM (Finite Element Method Magnetics) software environment to evaluate critical parameters such as magnetic flux density, inductance, and field behavior as a conductive target is brought near the sensing coil. The target materials considered include steel and aluminum, commonly encountered in industrial applications. This analysis identifies coil and core designs that offer optimal magnetic performance and sensor sensitivity for achieving the desired resolution and range. The results of this study are useful for guiding the development of precision displacement sensors intended for non-contact measurement, high-resolution positioning, and smart manufacturing systems. Keywords - Eddy Current Sensor, Displacement Sensing, Magnetic Flux Density, Inductance, Femm, Coil Design, High Resolution, Proximity Sensing