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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Guided wave phased array beamforming and imaging in composite plates.

Lingyu Yu1, Zhenhua Tian1

  • 1University of South Carolina, Department of Mechanical Engineering, Columbia, SC, United States.

Ultrasonics
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a phased array beamforming method using guided waves for inspecting anisotropic composite plates. This technique enables rapid detection of surface defects in large composite structures.

Keywords:
Anisotropic compositeGuided wavesMultiple defectsPhased arraysRapid inspection

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-destructive Testing

Background:

  • Composite materials are increasingly used in critical structures.
  • Effective non-destructive testing (NDT) methods are crucial for ensuring structural integrity.
  • Guided wave-based NDT offers potential for inspecting large areas efficiently.

Purpose of the Study:

  • To develop and demonstrate a phased array beamforming algorithm for guided waves in anisotropic composite plates.
  • To investigate the effectiveness of this method for damage detection.
  • To provide a foundation for rapid inspection of composite structures.

Main Methods:

  • A generic phased array algorithm considering direction-dependent guided wave parameters and energy skew was developed.
  • The delay-and-sum principle was applied to achieve beamforming.
  • Rectangular grid arrays and a scanning laser Doppler vibrometer were used for array characterization and damage detection experiments.

Main Results:

  • The beam pattern and beamforming factor were derived for rectangular grid arrays.
  • Detection images clearly identified multiple surface defects in a composite plate.
  • The guided wave phased array method demonstrated effectiveness in locating defects at various angles.

Conclusions:

  • Phased array beamforming using guided waves is a viable technique for anisotropic composite plates.
  • The method shows promise for rapid and effective inspection of large composite structures.
  • Further research can optimize the algorithm for enhanced defect characterization.