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Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique
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Yin, Xiaokang, Hutchins, David A., Chen, Guoming and Li, Wei (2012) Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique. NDT & E International, Volume 52 . pp. 157-166. doi:10.1016/j.ndteint.2012.08.004
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Official URL: http://dx.doi.org/10.1016/j.ndteint.2012.08.004
Abstract
This paper describes the application of the capacitive imaging (CI) technique to the detection of surface features on conducting specimens. The fundamental theory of the CI technique was briefly described. Comparison was made between the CI technique and the eddy current approach. A two-dimensional finite-element method was employed to model the electric field distribution from the CI probe, and how it interacts with conducting specimens through an insulation layer. Experiments using prototype CI probes were carried out. Effects of electrical conditions of the conducting specimen, lift-off distances and thicknesses of insulation between the CI probe and the conducting specimen were studied. The proof-of-concept results indicated that the CI technique is sensitive to surface features on conducting specimens through a significant air gap and/or insulation layer, thus could be used to detect Corrosion Under Insulation (CUI).
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Engineering | ||||
| Journal or Publication Title: | NDT & E International | ||||
| Publisher: | Elsevier Sci Ltd. | ||||
| ISSN: | 0963-8695 | ||||
| Official Date: | November 2012 | ||||
| Dates: |
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| Volume: | Volume 52 | ||||
| Page Range: | pp. 157-166 | ||||
| DOI: | 10.1016/j.ndteint.2012.08.004 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), National Natural Science Foundation of China (NSFC), Shandong provincial Natural Science Foundation of China | ||||
| Grant number: | 51205412, 50905187 (NSFC); ZR2009FQ001 (Shandong provincial Natural Science Foundation of China) |
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