Metallic coating thickness assessment over nonmagnetic metals using eddy current technology
A Master of Science thesis in Mechanical Engineering by Zain Ali Ansari entitled, “Metallic coating thickness assessment over nonmagnetic metals using eddy current technology”, submitted in April 2019. Thesis advisor is Dr. Bassam Abu-Nabah and thesis co-advisor Dr. Maen Alkhader. Soft and hard copy...
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| Format: | doctoralThesis |
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2019
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| Online Access: | http://hdl.handle.net/11073/16428 |
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| _version_ | 1864513437575413760 |
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| author | Ansari, Zain Ali |
| author_facet | Ansari, Zain Ali |
| author_role | author |
| dc.contributor.none.fl_str_mv | Abu-Nabah, Bassam Alkhader, Maen |
| dc.creator.none.fl_str_mv | Ansari, Zain Ali |
| dc.date.none.fl_str_mv | 2019-05-15T09:13:52Z 2019-05-15T09:13:52Z 2019-04 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | 35.232-2019.01 http://hdl.handle.net/11073/16428 |
| dc.language.none.fl_str_mv | en_US |
| dc.subject.none.fl_str_mv | Nonmagnetic Coating thickness Eddy current Nondestructive testing Inversion Eddy current testing Metal coating |
| dc.title.none.fl_str_mv | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| dc.type.none.fl_str_mv | info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/doctoralThesis |
| description | A Master of Science thesis in Mechanical Engineering by Zain Ali Ansari entitled, “Metallic coating thickness assessment over nonmagnetic metals using eddy current technology”, submitted in April 2019. Thesis advisor is Dr. Bassam Abu-Nabah and thesis co-advisor Dr. Maen Alkhader. Soft and hard copy available. |
| format | doctoralThesis |
| id | aus_942e4d611c3b673f8f02069e9335f254 |
| identifier_str_mv | 35.232-2019.01 |
| language_invalid_str_mv | en_US |
| network_acronym_str | aus |
| network_name_str | aus |
| oai_identifier_str | oai:repository.aus.edu:11073/16428 |
| publishDate | 2019 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
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| spelling | Metallic coating thickness assessment over nonmagnetic metals using eddy current technologyAnsari, Zain AliNonmagneticCoating thicknessEddy currentNondestructive testingInversionEddy current testingMetal coatingA Master of Science thesis in Mechanical Engineering by Zain Ali Ansari entitled, “Metallic coating thickness assessment over nonmagnetic metals using eddy current technology”, submitted in April 2019. Thesis advisor is Dr. Bassam Abu-Nabah and thesis co-advisor Dr. Maen Alkhader. Soft and hard copy available.Recent improvements in apparent eddy current conductivity (AECC) spectroscopy lends itself as a practical approach to assess metallic coating thicknesses over nonmagnetic metals. It can potentially offer one-order of magnitude improvement in coating thickness estimation when compared to existing phase-sensitive single-frequency and impedance-based multiple-frequency measurement systems. Existing methods require the lift-off distance between the sample and calibration blocks to be consistent to ensure that the obtained measurement is accurate. Building on AECC measurement capabilities, which offer a significantly reduced sensitivity to those deviations, a robust forward and inverse approach is developed in this thesis using single-frequency AECC measurements. The proposed inversion algorithm is developed using the Bisection method, a numerical interpolation technique used for approximating solutions where determining the exact answer is not possible. The logarithmic nature of the problem as well as the requirement of two initial guesses to start the iteration process while covering the entire coating thickness range of interest further justifies the use of the selected method. This not only reduces AECC spectroscopy measurements from a broad frequency range to single-frequency measurements, but also reduces the coil diameter by one-order of magnitude while complying with the plane-wave approximation in the lift-off range of interest. The accuracy in estimating coating thicknesses using both single- and multiple-frequency AECC measurement techniques are compared numerically and experimentally in agreement with the plane-wave approximation for different coating thicknesses relevant to the industry. It is demonstrated that AECC measurement technology delivers 3% uncertainty in metallic coating thickness estimation over nonmagnetic metals in a ±25.4 μm liftoff range. This makes it a practical approach to replace commercially available measurement systems while offering one-order of magnitude improvement in coating thickness estimation.College of EngineeringDepartment of Mechanical EngineeringMaster of Science in Mechanical Engineering (MSME)Abu-Nabah, BassamAlkhader, Maen2019-05-15T09:13:52Z2019-05-15T09:13:52Z2019-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdf35.232-2019.01http://hdl.handle.net/11073/16428en_USoai:repository.aus.edu:11073/164282025-06-26T12:31:09Z |
| spellingShingle | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology Ansari, Zain Ali Nonmagnetic Coating thickness Eddy current Nondestructive testing Inversion Eddy current testing Metal coating |
| status_str | publishedVersion |
| title | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| title_full | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| title_fullStr | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| title_full_unstemmed | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| title_short | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| title_sort | Metallic coating thickness assessment over nonmagnetic metals using eddy current technology |
| topic | Nonmagnetic Coating thickness Eddy current Nondestructive testing Inversion Eddy current testing Metal coating |
| url | http://hdl.handle.net/11073/16428 |