Journal
SENSORS
Volume 14, Issue 10, Pages 19354-19370Publisher
MDPI
DOI: 10.3390/s141019354
Keywords
crack detection; complementary split-ring resonator (CSRR); microstrip line technology; near-field detection; metamaterials
Funding
- King Saud University
- National Science and Engineering Research Council of Canada (NSERC)
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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.
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