A microwave non-destructive testing method for controlling polymeric coating of metal layers in industrial products. (March 2019)

• Record Type: Journal Article
• Authors: Mazzinghi, A.; Freni, A.; Capineri, L.
• Is Part Of: NDT & E international. Volume 102(2019)
• Page Start: 207
• Page End: 217
• Publication Date: 2019-03
• Subjects: Inspection systems -- Sensor -- Sizing -- Thickness -- Non-destructive testing -- Microwave sensing -- Periodic structures -- Oil industry -- Metal-plastic composites; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2018.12.003
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: The paper exploits the possibility of extracting the geometric properties of a polymeric coating of periodic metal layers used in industrial products from non-contact microwave backscattering measurements. Specifically, a flexible pipe having a periodically corrugated metal profile coated with a thick Polivinylidenedifluoride (PVDF) layer, suitable for oil industry applications, has been considered. The combined use of magnitude and phase of the reflected signal, acquired on a wide relative frequency band (∼15%), allows calculating the dielectric filling level and the period of each corrugation with accuracy better than 1/100 of the period length, 21 mm in our case. The results of an experimental campaign, carried out to estimate the accuracy achievable in the operational environment, are also shown.