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A new hybrid laser-ultrasound system enables 3D reconstruction of internal defects in metallic objects. This noncontact method improves defect imaging for enhanced quality control and material analysis.

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3D reconstructionNDTSAFTapodizationdefectslaser ultrasonicsnoncontact transducerssynthetic apertureweighting function

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Area of Science:

  • Materials Science and Engineering
  • Non-Destructive Testing
  • Ultrasonic Imaging

Background:

  • Quality control in industrial branches relies on nondestructive testing (NDT) for metallic objects.
  • Current NDT methods often lack sufficient detail for precise 3D defect reconstruction.
  • Accurate defect characterization is crucial for ensuring structural integrity and product reliability.

Purpose of the Study:

  • To develop a fully noncontact hybrid system for 3D reconstruction of embedded defects.
  • To enhance defect imaging by improving signal processing techniques.
  • To provide accurate volumetric data for defect location and size determination.

Main Methods:

  • A hybrid system combining laser-generated ultrasound excitation and noncontact ultrasonic transducer detection was employed.
  • The system allows scanning from multiple perspectives for comprehensive data acquisition.
  • A 2D apodization window filtering technique was integrated with the synthetic aperture focusing algorithm for signal enhancement.

Main Results:

  • The hybrid system successfully generated 3D reconstruction images of embedded defects.
  • The novel signal processing technique effectively reduced artifacts from side lobes and wide-angle reflections.
  • Qualitative and quantitative volumetric data regarding defect location and size were obtained.

Conclusions:

  • The developed hybrid laser-ultrasound system offers a robust solution for 3D defect reconstruction in metallic components.
  • This noncontact approach enhances defect visualization and characterization accuracy.
  • The method provides valuable insights for industrial quality control and material assessment.