Single pixel camera methodologies for spatially resolved acoustic spectroscopy

Patel, Rikesh; Sharples, Steve D.; Clark, Matt; Somekh, Mike G.; Li, Wenqi

Abstract

Spatially resolved acoustic spectroscopy (SRAS) is a laser ultrasound technique used to determine the crystallographic orientation (i.e. microstructure) of materials through the generation and measurement of surface acoustic wave velocity on a sample. Previous implementations have used a grating pattern imaged onto the surface to control the frequency of the generated wave in a single direction-grain orientation can be computed by acquiring wave velocities in different directions on the surface (gathered by physically rotating the grating pattern). This paper reports an advance to this methodology, inspired by single pixel cameras, using a coded grating pattern, created using a spatial light modulator, to excite surface acoustic waves in multiple directions simultaneously. This change to the optical arrangement can simplify the overall system alignment, remove mechanical complexities and is well suited for point-by-point full orientation imaging, potentially allowing for faster orientation imaging using SRAS microscopy. Improvements to the robustness of measurement may be expected to extend the applicability of SRAS in the material science field. To demonstrate this methodology, experiments were conducted on isotropic and anisotropic samples.

Citation

Patel, R., Sharples, S. D., Clark, M., Somekh, M. G., & Li, W. (2021). Single pixel camera methodologies for spatially resolved acoustic spectroscopy. Applied Physics Letters, 118(5), Article 051102. https://doi.org/10.1063/5.0040123

• Journal Article Type: Article
• Acceptance Date: Jan 21, 2021
• Online Publication Date: Feb 2, 2021
• Publication Date: Feb 1, 2021
• Deposit Date: Feb 1, 2021
• Publicly Available Date: Feb 1, 2021
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 118
• Issue: 5
• Article Number: 051102
• DOI: https://doi.org/10.1063/5.0040123
• Keywords: Physics and Astronomy (miscellaneous)
• Public URL: https://nottingham-repository.worktribe.com/output/5286223
• Publisher URL: https://aip.scitation.org/doi/full/10.1063/5.0040123