The Effect of Gain and Frequency on Eddy Current Testing for Copper Material Defect Inspection

Abstract

Abstract Copper and the copper alloys are some of the most versatile materials available and used for applications in every type of industry with world consumption of exceeding 14 million tonnes per annum. In eddy current testing inspection (ECT), several forms of device calibration must be done before the assessment can be performed. The electronics equipment must be calibrated to ensure the accuracy of measurement. This paper is focused on investigate the optimum frequency and gain for copper material block. The material used to produce the sample test in this project was copper. They are many methods that involved in this project such as producing sample test and artificial defect, conductivity measure and perform calibration for copper material block. Two thickness of copper block were selected 8mm and 16 mm. Artificial defect with depth of defect 0.5 mm, 1mm and 2.0 mm are fabricate on the sample. Different frequency and gain of eddy current testing was used in order to identify the best setting for both parameters in ECT for copper material defect inspection. Experimental result showed that the thickness is directly proportional with the applied gain. From here the negative scanning will giving the good result of different slot of defect comparing the negative scanning. Besides the percentage of increment of signal amplitude being identify with increment 40% signal between 0.5mm and 1.0mm slot of defect. Lastly the depth of the slot is inversely proportional with applied gain.