title: Detection of surface and subsurface cracks in metallic and non-metallic materials using a complementary split-ring resonator.
abstract: Available microwave techniques for crack detection have some challenges, such as design complexity and working at a high frequency. These challenges make the sensing apparatus design complex and relatively very expensive. This paper presents a simple method for surface and subsurface crack detection in metallic and non-metallic materials based on complementary split-ring resonators (CSRRs). A CSRR sensor can be patterned on the ground plane of a microstrip line and fabricated using printed circuit board technology. Compared to available microwave techniques for sub-millimeter crack detection, the methods presented here show distinct advantages, such as high spatial resolution, high sensitivity and design simplicity. The response of the CSRR as a sensor for crack detection is studied and analysed numerically. Experimental validations are also presented.
authors.affiliation: Electrical and Computer Engineering Department, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada. aalbishi@KSU.EDU.SA.
authors.forename: Ali
authors.initials: A
authors.lastname: Albishi
authors.affiliation: Electrical and Computer Engineering Department, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada. oramahi@uwaterloo.ca.
authors.forename: Omar M
authors.initials: OM
authors.lastname: Ramahi