A polarized digital shearing speckle pattern interferometry system based on temporal wavelet transformation.

Area of Science:

• Optics and Photonics
• Materials Science and Engineering
• Mechanical Engineering

Background:

• Digital shearing speckle pattern interferometry (DSSPI) is a valuable technique for strain testing.
• Temporal analysis-based DSSPI systems offer dynamic strain measurement capabilities.

Purpose of the Study:

• To build and demonstrate a DSSPI system utilizing a Wollaston prism for dynamic strain analysis.
• To validate the system's performance in quantitative displacement-derivative measurements.

Main Methods:

• Construction of a novel DSSPI system incorporating a Wollaston prism.
• Experimental testing of an aluminum plate to measure displacement derivatives.
• Application of wavelet transformation and Fourier transformation for data analysis.
• Finite element method simulations for comparative analysis.

Main Results:

• The developed DSSPI system successfully performed displacement-derivative tests on an aluminum plate.
• Quantitative measurement of displacement derivatives was achieved.
• Comparison between experimental results and finite element simulations confirmed the system's accuracy.

Conclusions:

• The DSSPI system with a Wollaston prism is effective for dynamic strain measurement.
• The combination of DSSPI, wavelet, and Fourier transformations enables accurate quantitative analysis of displacement derivatives.
• This technique holds potential for advanced materials testing and structural health monitoring.