Laser shock deformation measurement based on multi-channel dynamic shearography

Area of Science:

• Optical Engineering
• Materials Science
• Non-Destructive Testing

Background:

• Laser shock peening (LSP) is a critical surface treatment process.
• Accurate monitoring of dynamic material deformation during LSP is essential for process optimization.
• Existing methods may lack the real-time, high-precision capabilities required for dynamic deformation analysis.

Purpose of the Study:

• To develop and validate a real-time, high-precision material deformation monitoring method.
• To investigate the dynamic deformation behavior of materials during laser shock peening (LSP).
• To enable decoupled control of spatial-carrier frequencies for enhanced measurement accuracy.

Main Methods:

• Implementation of spatial-carrier dual-directional shearography.
• Optimization of optical system design with a tri-aperture misaligned configuration.
• Utilizing windowed inverse Fourier transform for real-time phase map acquisition and strain measurement.

Main Results:

• Achieved synchronous measurement along orthogonal shear directions.
• Demonstrated decoupled control of constant spatial-carrier frequencies.
• Successfully enabled real-time, high-precision dynamic strain measurement during LSP.

Conclusions:

• The proposed spatial-carrier dual-directional shearography system offers a robust solution for real-time, high-precision dynamic deformation monitoring.
• The method is effective for investigating material behavior under dynamic loading conditions like LSP.
• The optimized optical design and frequency control ensure accurate and reliable strain measurements.