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Complementary Split-Ring Resonator for Crack Detection in Metallic Surfaces

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3 Author(s)
Ali M. Albishi ; Department of Electrical and Computer Engineering ; Muhammed S. Boybay ; Omar M. Ramahi

A new sensor based on complementary split-ring resonators is presented to detect sub-millimeter surface cracks. The sensing mechanism is based on perturbing the electromagnetic field around an electrically small resonator, thus initiating a shift in the resonance frequency. The sensor is simple to fabricate and inexpensive as it is etched out in the ground plane of a microstrip-line using printed circuit board technology. The sensor exhibits a frequency shift of more than 240 MHz for a 100 μm crack.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:22 ,  Issue: 6 )