Related Experiment Video
Updated: Oct 26, 2025
11:34
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
11.3K
Defect localization by an extended laser source on a hemisphere.
Daniel Veira Canle1, Joni Mäkinen2, Richard Blomqvist2
1Department of Physics, Division of Material Physics, Faculty of Science, University of Helsinki, P.O.B. 64, 00014, Helsinki, Finland. daniel.veiracanle@helsinki.fi.
Scientific Reports
|July 27, 2021
Summary
This study uses a laser line source to locate defects in curved shapes. The method successfully identified a pit in a steel hemisphere, enabling contactless inspection for medical implants.
Area of Science:
- Acoustic wave propagation and defect localization.
- Non-destructive testing and evaluation.
- Biomedical engineering applications.
Background:
- Curved geometries present challenges for acoustic wave analysis due to multiple resonances and hotspots.
- Accurate defect localization is crucial for material integrity and component reliability.
Purpose of the Study:
- To develop and validate a method for localizing defects in curved structures using acoustic waves.
- To investigate the effectiveness of a laser line source for simplifying acoustic scattering problems.
Main Methods:
- Experimental application of a laser line source to launch acoustic waves.
- Finite element method (FEM) simulations to verify experimental findings.
- 3D visualization of detected defects.
Main Results:
- Successful localization and sizing of a pit defect in a steel hemisphere.
- Experimental results were accurately reproduced by FEM simulations.
- Demonstrated the feasibility of visualizing defects on a 3D model.
Conclusions:
- A laser line source approach effectively simplifies acoustic scattering in curved geometries.
- The proposed method enables accurate defect detection and characterization in complex shapes.
- Potential application in contactless inspection of medical implants like acetabular cups.
