研究目的
To apply synchrosqueezing transform (SST) to the analysis of laser-excited surface acoustic waves (LSAW) for the measurement of surface properties through dispersion curve inversion.
研究成果
SST is an effective tool for analyzing LSAW and calculating its dispersion curve, showing higher time-frequency resolution and robustness compared to other methods. The fast algorithm for film thickness inversion demonstrates high accuracy with minimal error.
研究不足
The study focuses on the analysis of LSAW signals and inversion of film thickness in a controlled simulation environment. Real-world applications may face challenges such as noise interference and material variability.
1：Experimental Design and Method Selection:
SST is applied to analyze LSAW signals, comparing its performance with other time-frequency analysis methods like CWT, WVT, and SPWVT.
2：Sample Selection and Data Sources:
A constructed linear frequency LSAW signal and finite element simulations of LSAW propagation in a film/substrate structure are used.
3：List of Experimental Equipment and Materials:
COMSOL? Multiphysics software for finite element simulations.
4：Experimental Procedures and Operational Workflow:
Simulation of LSAW propagation, extraction of LSAW signals at different distances, and application of SST for time-frequency analysis.
5：Data Analysis Methods:
Extraction of time-frequency information from SST distributions to calculate dispersion curves and inversion of film thickness.
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