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http://dx.doi.org/10.6109/jkiice.2019.23.9.1131

A Study on Coating Film Thickness Measurement in vehicle Using Eddy Current Coil Sensor  

Park, Hwa-Beom (Department of Bio Medical Engineering, Ajou University)
Kim, Young-Kil (Department of Electronic Engineering, Ajou University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.23, no.9, 2019 , pp. 1131-1138 More about this Journal
Abstract
The importance of coatings has been increasing for different purposes such as prevention of static electricity of auto parts or products, improvement of abrasion and corrosion resistance, and enhancement of esthetics. As a method for measuring the thickness of a coating film, a contact method with probe is commonly used. However, it is problematic that accuracy of the sensor is degraded due to sensor output distortion or load phenomenon, which is caused by a change in magnetic permeability of the core. In this study, we propose a method to reduce the measurement error of the coating film by applying the optimized circuit design and the thickness measurement algorithm to the problems caused by the nonlinear characteristics. The tests result which have been taken with different thickness coating samples show that the measurement accuracy is within ${\pm}2%$.
Keywords
Inductive proximity Sensor; magnetic Sensor; metal surface; eddy current;
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