Numerical Simulation and Experimental Study of Capacitive Imaging Technique as a Nondestructive Testing Method

It was recently demonstrated that a coplanar capacitive sensor could be applied to the evaluation of materials without the disadvantages associated with the other techniques. This technique effectively detects changes in the dielectric properties of the materials due to, for instance, imperfections...

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Bibliographic Details
Published in:Applied sciences 2021-05, Vol.11 (9), p.3804
Main Authors: Abdollahi-Mamoudan, Farima, Savard, Sebastien, Filleter, Tobin, Ibarra-Castanedo, Clemente, P. V. Maldague, Xavier
Format: Article
Language:English
Subjects:
capacitive sensing
Computer simulation
coplanar sensor
Defects
Dielectric properties
Electric contacts
Electric fields
Electrical properties
Electrodes
FE modeling
Geometry
Imaging
Imaging techniques
Inspection
Manufacturing
Mathematical models
Methods
Microelectromechanical systems
NDT techniques
Nondestructive testing
Qualitative analysis
Radiation
Sensors
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Summary:It was recently demonstrated that a coplanar capacitive sensor could be applied to the evaluation of materials without the disadvantages associated with the other techniques. This technique effectively detects changes in the dielectric properties of the materials due to, for instance, imperfections or variations in the internal structure, by moving a set of simple electrodes on the surface of the specimen. An AC voltage is applied to one or more electrodes and signals are detected by others. This is a promising inspection method for imaging the interior structure of the numerous materials, without the necessity to be in contact with the surface of the sample. In this paper, finite element (FE) modeling was employed to simulate the electric field distribution from a coplanar capacitive sensor and the way it interacts with a nonconducting sample. Physical experiments with a prototype capacitive sensor were also performed on a Plexiglas sample with subsurface defects, to assess the imaging performance of the sensor. A good qualitative agreement was observed between the numerical simulation and experimental result.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11093804