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Spatial ultrasonic wavefront characterization using a laser parametric curve scanning method
See Yenn Chong1, Michael D Todd1
1Department of Structural Engineering, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA 92093-0085, USA.
Ultrasonics
|September 20, 2020
Summary
This study introduces a novel parametric curve laser scanning method for ultrasonic wavefield imaging. This technique accurately characterizes ultrasonic wavefronts in materials, advancing nondestructive evaluation and structural health monitoring.
Area of Science:
- Materials Science
- Wave Propagation Physics
- Non-destructive Testing
Background:
- Ultrasonic wavefield imaging (UWI) is crucial for nondestructive evaluation (NDE) and structural health monitoring (SHM).
- Ultrasonic wavefronts exhibit unique propagation patterns representable by parametric curves.
- Characterizing these wavefronts is essential for accurate material analysis.
Purpose of the Study:
- To propose and validate a spatial ultrasonic wavefront characterization method using parametric curve laser scanning.
- To assess the method's efficacy on both isotropic (aluminum) and anisotropic (CFRP) materials.
- To explore the potential of this method for advancing NDE-SHM applications.
Main Methods:
- Utilized ultrasonic wavefield imaging (UWI) to determine parametric equations of wavefronts.
- Employed a laser ultrasonic interrogation system (LUIS) for ultrasound measurement and updating.
- Applied temporal cross-correlation techniques to quantify parametric curve values.
- Tested on aluminum and cross-ply CFRP plates, considering different material regions.
Main Results:
- Successfully characterized spatial incident and reflected wavefronts in aluminum and CFRP plates.
- Demonstrated the capability of laser circle and cyclic-harmonic scans for S0 and A0 mode wavefronts.
- The laser hyperbolic curve scan also provided valuable characterization data.
- The method showed promise in analyzing both isotropic and anisotropic material responses.
Conclusions:
- The proposed parametric curve laser scanning method offers a new approach for ultrasonic wavefront characterization.
- Integration with LUIS can enhance damage detection capabilities in NDE-SHM.
- Provides valuable insights for the design and improvement of ultrasonic algorithms.
