Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Capacitive imaging technique for NDE
Fundamentals of the capacitive imaging technique have been described in this paper. The predictions from 2D FE models in COMSOLTM indicate that the capacitive imaging system has the potential to detect hidden defects in the form of air voids within dielectric materials and to image surface features on metals through an insulation layer. Sensitivity distributions of the back to back and point to point triangular pair probes were obtained through 3D models also constructed in COMSOLTM and the analysis of the distribution can work as an easy way of characterising the CI probe. The experiment result on steel sample covered by foam insulation indicated that good surface information (including the location and depth of the holes) can be obtained through the insulation layer, which suggests the CI technique could be useful for detecting the presence of pitting caused by corrosion under insulation (CUI) on real industrial samples. The result on concrete sample indicated that the CI technique is sensitive to hidden void in concrete sample and can work as a useful supplement to the commercial concrete inspection tools. The CI technique is advantageous for its non-contact and non-invasive nature and only requires a single side access to the sample. It works in a volume averaging manner, and hence the scattering issue in ultrasound inspections is absent. It operates on nonconducting samples, which leads to a wider application range compared to the eddy current method in such materials.
Capacitive imaging technique for NDE
Fundamentals of the capacitive imaging technique have been described in this paper. The predictions from 2D FE models in COMSOLTM indicate that the capacitive imaging system has the potential to detect hidden defects in the form of air voids within dielectric materials and to image surface features on metals through an insulation layer. Sensitivity distributions of the back to back and point to point triangular pair probes were obtained through 3D models also constructed in COMSOLTM and the analysis of the distribution can work as an easy way of characterising the CI probe. The experiment result on steel sample covered by foam insulation indicated that good surface information (including the location and depth of the holes) can be obtained through the insulation layer, which suggests the CI technique could be useful for detecting the presence of pitting caused by corrosion under insulation (CUI) on real industrial samples. The result on concrete sample indicated that the CI technique is sensitive to hidden void in concrete sample and can work as a useful supplement to the commercial concrete inspection tools. The CI technique is advantageous for its non-contact and non-invasive nature and only requires a single side access to the sample. It works in a volume averaging manner, and hence the scattering issue in ultrasound inspections is absent. It operates on nonconducting samples, which leads to a wider application range compared to the eddy current method in such materials.
Capacitive imaging technique for NDE
Kapazitive ZfP-Abbildungstechnik
Yin, X. (Autor:in) / Hutchins, D.A. (Autor:in)
2011
8 Seiten, 7 Bilder, 14 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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