4.7 Article

Detection of Metallic Surface Cracks Based on Multiunit Periodic Resonant Structure

Journal

IEEE SENSORS JOURNAL
Volume 22, Issue 22, Pages 21651-21658

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3210169

Keywords

Sensors; Surface cracks; Periodic structures; Resonant frequency; Sensitivity; Metals; Capacitive sensors; Metallic materials; microwave nondestructive testing (NDT); multiunit periodic resonant structure; slender crack

Funding

  1. Ministry of Industry and Information Technology (MIIT) through High-Tech Ship Research Project [[2019] 357]
  2. Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, through the Key Special Project for Introduced Talents Team [GML2019ZD0502]

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A novel sensor based on a multiunit periodic resonant structure is proposed for detecting slender cracks on a metallic surface. The sensor achieves higher detection sensitivity by reducing the surface area of the resonant structure and increasing the current flow path. It can detect metallic surface cracks with a width of 0.02 mm. The multiunit periodic structure sensor has better detection ability than the single-unit structure.
A novel sensor based on a multiunit periodic resonant structure is proposed to detect slender cracks on a metallic surface. The detection is based on the variation of the resonance frequency of the sensor, which is caused by metallic surface cracks. By etching rectangular stripes in the ring to reduce the surface area of the resonant structure and increase the current flow path, it can achieve higher detection sensitivity and can detect metallic surface cracks with 0.02-mm width. Periodic expansion of a single-unit structure can increase the concentration area of the electromagnetic field of the sensor and make it more sensitive to slender cracks. By simulation and experiment, when detecting cracks of the same size, the resonance frequency shift of the multiunit periodic structure is higher than that of the single-unit structure, indicating that the multiunit periodic structure has better detection ability. The multiunit periodic structure sensor has a frequency shift of more than 300 MHz for a slender crack with a 0.02-mm width.

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