研究目的
Investigating the spatial distribution of phononic crystal modes excited by a moving laser source and the relationship between phase velocity and frequency in Lamb waves within a periodically corrugated aluminum plate.
研究成果
The study successfully demonstrated the spatial distribution of phononic crystal modes excited by a moving laser source, showing good agreement between experimental results and theoretical predictions. The method provides significant insights into the acoustic characteristics of periodic structures and the development of related devices.
研究不足
The study is limited by the experimental setup's ability to detect modes with negative group velocities and the range of laser spot speeds achievable. The method's efficiency depends on both phase and group velocity matching with the moving laser spot.
1：Experimental Design and Method Selection:
A mode selection method was applied to generate Lamb waves in a periodically corrugated plate using a moving continuous wave laser. The signal was detected at various points to observe the spatial distribution of wave amplitudes.
2：Sample Selection and Data Sources:
A 1060 aluminum plate with a periodic rectangular corrugation was used. The plate thickness was 1.0 mm, with grooves depth of 0.5 mm and unit cell length of 4.0 mm.
3：0 mm, with grooves depth of 5 mm and unit cell length of 0 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A powerful continuous wave laser (1080 nm wavelength), a rotating 10-faced polyhedral mirror, and a contact broad-band piezoelectric transducer based on PVDF foil were used.
4：Experimental Procedures and Operational Workflow:
The laser spot moved across the sample surface with a controlled velocity. The vibration signals were detected by the transducer positioned within the central area of the excitation range.
5：Data Analysis Methods:
The dispersion curves were calculated numerically using COMSOL Multiphysics software. The experimental data was analyzed to observe the relationship between phase velocity and frequency.
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