Referencing technique for phase detection in eddy current evaluation

Nurul A'In Nadzri,Mohd Aufa Hadi Putera Zaini,Mohd Mawardi Saari,Zulkifly Abd Aziz

doi:10.15282/jmes.15.4.2021.13.0679

Nurul A'In Nadzri, Mohd Aufa Hadi Putera Zaini + Show 2 more

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https://doi.org/10.15282/jmes.15.4.2021.13.0679

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Abstract

This paper presents an eddy current testing (ECT) method with a different type of referencing technique for crack detection in carbon steel plate by using two Anisotropic Magnet Resistance (AMR) sensors to detect and evaluate the artificial cracks and to study the output signal's characteristics of each technique. The experiment setup of the magnetic scanning device and the measurement mode is included. Based on these three techniques that have been used, it shown that differential technique with the condition of the required reference signal must be dynamic from one point to one point was the best way to implement in the ECT method. The line scanning results indicate that performing these three techniques can be used to estimate the position of the slits, however, for 2-D mapping, it is shown that the differential technique is a preferable technique where it can remove the noise response, and at the same time, it generates a clear image of the crack. It is predicted that the developed ECT probe using a differential technique can be used as a technique to estimate the characteristic of defects in a metal plate.

Highlights

Non-destructive tests (NDT) are commonly used to detect structural defects, surface changes, the development of defects or other defect abnormalities, to evaluate the thickness of materials and coatings, and to determine other industrial product characteristics [1]
This paper proposed an Eddy current testing (ECT) probe for non-destructive testing of metal materials using different detection techniques
The probe consists of an excitation coil to produce a magnetic field and high sensitivity Anisotropic Magnet Resistance (AMR) sensors

Summary

Introduction

Non-destructive tests (NDT) are commonly used to detect structural defects, surface changes, the development of defects or other defect abnormalities, to evaluate the thickness of materials and coatings, and to determine other industrial product characteristics [1]. NDT is applied in industries to prevent failure and accidents by making sure that all the structure is in good condition to work on. Eddy current testing (ECT) [4] is one of the relevant electromagnetic NDT techniques technology to improve the quality of the product especially for metal structure [5]. Eddy current is created from the process of electromagnetic induction. To make sure that the probe will fit with the testing area and purpose, the types of the probe operation needs to be studied first. The mode of operation divided into three which is absolute, differential [11] and reflection [12]

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