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A split-ring resonator probe for assessing subsurface wood defects.

Yi Xie1, Xiaoqing Yang2, Hui Xiao2

  • 1Graduate School, Southwest University of Science and Technology, Mianyang 621010, China.

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|January 3, 2020
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This summary is machine-generated.

This study introduces a Microwave Nondestructive Testing (MNDT) method using a novel probe for detecting subsurface wood defects. The technique accurately identifies structural flaws under paint layers with high spatial resolution.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Wood Science

Background:

  • Nondestructive testing (NDT) is crucial for assessing material integrity without causing damage.
  • Microwave Nondestructive Testing (MNDT) offers a promising approach for inspecting dielectric materials like wood.
  • Subsurface structural defects in wood can compromise its mechanical properties and longevity.

Purpose of the Study:

  • To develop and validate a Microwave Nondestructive Testing (MNDT) method for detecting subsurface structural defects in wood.
  • To design and implement a compact, high-resolution microwave near-field probe for wood inspection.
  • To evaluate the sensor's performance in analyzing wood characteristics, including moisture content and defect dimensions.

Main Methods:

  • A microwave near-field probe utilizing a split-ring resonator was designed and coupled to a microstrip line.
  • The sensor was employed to detect subsurface defects in wood samples with varying moisture content and defect sizes.
  • Scattering parameter S21 was measured and analyzed to characterize wood properties and identify defects.
  • Spatial resolution and measurement accuracy were experimentally determined.

Main Results:

  • The developed sensor demonstrated high resolution (0.42λ₀ at 9 GHz) and accuracy, with a maximum relative error of less than 10% in width measurement.
  • The probe successfully detected subsurface defects under a thin paint layer without removing the coating.
  • The method proved effective across different wood moisture content levels.

Conclusions:

  • The proposed MNDT method with the novel microwave probe is effective for accurate detection and analysis of subsurface wood defects.
  • The sensor's compact, lightweight, and cost-effective design makes it suitable for practical applications in wood inspection.
  • This technique enables reliable assessment of wood quality, even in the presence of surface coatings and varying moisture conditions.