Non-contact defect detection in multilayer carbon composite materials using electric potential sensors and an a.c. potential drop method

Prance, Robert (2008) Non-contact defect detection in multilayer carbon composite materials using electric potential sensors and an a.c. potential drop method. In: 17th SIMoNET Meeting “Development of Sensors & SIM of Infrastructure”, 8th April, 2008, University College London, UK.

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Abstract

A new non-destructive testing technique was described, a non-contact version of the well known a.c. potential drop method. Electric potential sensor technology (EPS), invented at Sussex, is capable of measuring, noncontact, the spatial electric potential associated with a sample via the displacement current, through capacitive coupling. This can be achieved due to the extremely high input impedance of the sensors, resulting in many cases in no loss of signal when compared with a contact voltage measurement. For laboratory samples an a.c. current is passed through the sample and the spatial potential above the surface monitored as a function of position. The presentation reported results from such a laboratory system and associated finite element simulations of the potential associated with simple defects in multilayer carbon composite materials. A full non-contact eight element imaging array with the excitation signal being induced inductively, as in eddy current testing, is under construction at Sussex.

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Robert Prance
Date Deposited: 06 Feb 2012 18:45
Last Modified: 24 Jun 2015 12:33
URI: http://sro.sussex.ac.uk/id/eprint/18153
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