Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique

Eddy Current Testing (ECT) technique is one of the Non-Destructive Testing (NDT) methods that is sensitive to the unintended signal such as the lift-off (LO) effect. For ECT technique, LO effect is one of the constraints due to the weakened detection that affected the output of the signals. This pre...

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Main Author:	Salmia Santa
Format:	Thesis
Language:	English English
Published:	2020
Subjects:	TA401-492 Materials of engineering and construction Mechanics of materials
Online Access:	https://eprints.ums.edu.my/id/eprint/40709/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/40709/2/FULLTEXT.pdf
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spelling	my-ums-ep.407092024-10-03T00:50:20Z Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique 2020 Salmia Santa TA401-492 Materials of engineering and construction. Mechanics of materials Eddy Current Testing (ECT) technique is one of the Non-Destructive Testing (NDT) methods that is sensitive to the unintended signal such as the lift-off (LO) effect. For ECT technique, LO effect is one of the constraints due to the weakened detection that affected the output of the signals. This presented research aims to develop a coil probe that generates eddy current signals by using an ECT technique to determine the optimum distance of LO height for three different chosen materials (e.g., copper, brass, and magnesium alloy) of three (3) different thickness which is 1.5 mm, 3.0 mm and 5.0 mm each. The output voltage of the defects signal of the tested materials can be determined from the optimum distance of LO height of the ECT technique. The coil probe used consists of an exciter-receiver coil, where 5.25 MHz is the optimal frequency. This frequency then generates the signal of the ECT technique. This technique was set up using a 50 ohms function generator and an established amplifier to boost up the output signals. The acquired optimum distance LO height for this research is approximately 2 mm. The findings from this established technique indicate that the determined LO height can be determined from the output voltage signal of the defects as well as to detect the thicknesses. The output voltage signal from the ECT technique was analysed and compared. As conclusion, the output voltage signals slightly increased for larger material defects and subsequently decreased with greater thickness detection. Hence, the LO height parameters of the ECT technique in this research can detect defect appropriately. 2020 Thesis https://eprints.ums.edu.my/id/eprint/40709/ https://eprints.ums.edu.my/id/eprint/40709/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/40709/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Faculty of Science and Natural Resources
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	TA401-492 Materials of engineering and construction Mechanics of materials
spellingShingle	TA401-492 Materials of engineering and construction Mechanics of materials Salmia Santa Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
description	Eddy Current Testing (ECT) technique is one of the Non-Destructive Testing (NDT) methods that is sensitive to the unintended signal such as the lift-off (LO) effect. For ECT technique, LO effect is one of the constraints due to the weakened detection that affected the output of the signals. This presented research aims to develop a coil probe that generates eddy current signals by using an ECT technique to determine the optimum distance of LO height for three different chosen materials (e.g., copper, brass, and magnesium alloy) of three (3) different thickness which is 1.5 mm, 3.0 mm and 5.0 mm each. The output voltage of the defects signal of the tested materials can be determined from the optimum distance of LO height of the ECT technique. The coil probe used consists of an exciter-receiver coil, where 5.25 MHz is the optimal frequency. This frequency then generates the signal of the ECT technique. This technique was set up using a 50 ohms function generator and an established amplifier to boost up the output signals. The acquired optimum distance LO height for this research is approximately 2 mm. The findings from this established technique indicate that the determined LO height can be determined from the output voltage signal of the defects as well as to detect the thicknesses. The output voltage signal from the ECT technique was analysed and compared. As conclusion, the output voltage signals slightly increased for larger material defects and subsequently decreased with greater thickness detection. Hence, the LO height parameters of the ECT technique in this research can detect defect appropriately.
format	Thesis
qualification_level	Master's degree
author	Salmia Santa
author_facet	Salmia Santa
author_sort	Salmia Santa
title	Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
title_short	Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
title_full	Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
title_fullStr	Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
title_full_unstemmed	Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
title_sort	optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique
granting_institution	Universiti Malaysia Sabah
granting_department	Faculty of Science and Natural Resources
publishDate	2020
url	https://eprints.ums.edu.my/id/eprint/40709/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/40709/2/FULLTEXT.pdf
_version_	1818611369074753536

Optimum distance of lift-off height to detect defect on testing materials using eddy current testing technique

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