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Laser-induced ultrasound in multiple thin layers-An analytical solution.
Manne Segerlund1, Torbjörn Löfqvist1
1Department of Computer Science, Electrical- and Space Engineering, Luleå University of Technology, Luleå, Sweden.
The Journal of the Acoustical Society of America
|August 14, 2024
Summary
This study analyzes laser-induced ultrasound in layered materials, developing an analytical solution for predicting ultrasonic pulse generation. The findings offer insights into optimizing layered structures for specific ultrasonic applications.
Area of Science:
- Physics
- Materials Science
- Acoustics
Background:
- Laser-induced ultrasound relies on thermo-elastic conversion of light pulses into pressure waves.
- Layered structures offer potential for generating tailored, wideband ultrasonic pulses.
Purpose of the Study:
- To study laser-induced ultrasound in planar layered structures with varying properties.
- To derive an analytical time-domain solution for transmitted pressure from these structures.
- To investigate the spectral properties of generated ultrasonic pulses.
Main Methods:
- Developed an analytical time-domain solution for arbitrary layers and absorption profiles.
- Utilized free space Green's functions and image sources.
- Proposed a solution based on the Beer-Lambert law.
- Compared analytical results with 1D and 3D (axially symmetric) k-Wave simulations.
Main Results:
- Derived an analytical solution for pressure transmission in layered structures.
- Demonstrated the influence of optical absorption coefficients and layer thicknesses on spectral properties.
- Validated the analytical solution against numerical simulations, showing good agreement under specific conditions.
Conclusions:
- The derived analytical solution accurately predicts laser-induced ultrasound in layered materials.
- Layered structures can be engineered for specific ultrasonic pulse generation.
- The study provides a foundation for designing advanced ultrasonic systems using layered materials.
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