Effects of Coil Diameter in Thickness Measurement Using Pulsed Eddy Current Non-destructive Testing

6th International Conference on Mechatronics

机械制造;无线电电子学

Azaman, Khairun Nisa^1 ; Sophian, Ali^1 ; Nafiah, Faris^1

Department of Mechatronics Engineering, Faculty of Engineering, International Islamic University Malaysia, Malaysia^1

关键词: Aluminium plates;    Electromagnetic modeling;    Excitation coils;    Good correlations;    Non destructive testing;    Permanent damage;    Pulsed eddy current;    Single frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/260/1/012001/pdf
DOI  :  10.1088/1757-899X/260/1/012001

来源: IOP

【 摘 要 】

Non-destructive testing (NDT) techniques are used in industry to evaluate the properties of a material, component or structure without causing any permanent damage. Among the techniques, pulsed eddy current (PEC) NDT is regarded as a new technique where a broadband pulse excitation is used, as opposed to single frequencies employed in conventional eddy current NDT. In this study, a 2D axisymmetric electromagnetic model of a PEC probe has been developed and it has been used to study the effects of the excitation coil diameter on the performance of PEC probes in sample thickness measurement. A PEC system has also been built to validate the model. Aluminium plates are used as the sample and they can be stacked up to replicate thickness from 1 mm to 10 mm. The results show that there is a very good correlation between the simulation and experimental results, with an average error of less than 10%. The results also suggest that the larger the diameter of the excitation coil, the deeper the penetration and therefore the larger the thickness measurement range. It has also been shown that although the larger diameters have deeper penetration, the smallest diameter has the highest sensitivity if normalization is not used. These conclusions indicate that coil diameter is an important parameter in a PEC probe design for thickness measurement applications.