Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window

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.