Researchers in the IIT-Madras and the University of Nairobi have used metamaterials to improve detection of defects in large structures by guided wave ultrasound.
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In guided wave testing (GWT), the sound waves are sent along the length of the structure rather than into the structure, allowing the waves to travel longer distances.
But GWT has poorer resolution than the conventional ultrasound-based testing due to diffraction limitations. The research team used metamaterials to improve the resolution of guided ultrasound waves.
Metamaterials are artificially crafted materials with unique internal microstructures that give them properties not found in nature.
The constituent artificial units of the metamaterial can be tailored in shape, size, and interatomic interaction, to exhibit unusual properties.
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