A Uniform Eddy Current Probe with a Double-Excitation Coil for Flaw Detection on Aluminium Plates

Ageng Sadnowo Repelianto,Masaki Matsunaga,Naoya Kasai,Kouichi Sekino

doi:10.3390/met9101116

Ageng Sadnowo Repelianto, Masaki Matsunaga + Show 2 more

Open Access

https://doi.org/10.3390/met9101116

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Journal: Metals	Publication Date: Oct 19, 2019
Citations: 11	License type: CC BY 4.0

Affiliation: Yokohama National University, Lampung University

Abstract

In this present study, a new uniform eddy current (UEC) probe with a double-excitation coil and pancake orientation is proposed. It is confirmed that the probe generates a strong magnetic field induction that increases the intensity of uniform eddy currents; moreover, it is found to be more efficient in power consumption for excitation using a finite element simulation. Experiments are performed to detect different flaw lengths and depths on an aluminium plate. The flaw signal detected by the probe indicates a high signal-to-noise ratio and increases as a function of flaw depth. The quantitative evaluation of flaws with the proposed UEC probe is achieved based on experimental results.

Highlights

Eddy current testing is widely used as a non-destructive testing technique in the industry to evaluate the size of flaws in structural components [1,2,3]
1, the butterfly probe moves in the x-direction shifts in the y-direction, is repeated until scanning covers probe moves in the x-direction andand shifts in the y-direction, andand is repeated until the the scanning covers all the flaws
Because the tendencies of the signals for 20–4 and 20–2 are the same, the flaw depth can be quantitatively evaluated based on the amplitude of measured signals

Summary

Introduction

Eddy current testing is widely used as a non-destructive testing technique in the industry to evaluate the size of flaws in structural components [1,2,3]. One is the combined transmit-receive probe equipped with a single coil that functions as an excitation coil and a detection coil The concept of this single coil is based on the principle that a change in impedance occurs when discontinuities disrupt the eddy current distribution in the test piece [2,6]. UEC probes are for detecting flaws on the surface of the test piece with high frequency of excitation current and are specially designed to have resistance to lift-off variation in the measurement [1,7,8]. The signal; only parts that are close and parallel to the test piece are actively involved in this regard To overcome these relatively small signals, several trials using excitation currents with high. Ability to detect flaws on the aluminium plate surface is discussed based on experimental results

Design

Numerical Calculations

Results andand

Measurement

Measurement along Paths

Conclusions