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Single pixel camera methodologies for spatially resolved acoustic spectroscopy

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

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Authors

Steve D. Sharples

MATT CLARK matt.clark@nottingham.ac.uk
Professor of Applied Optics

WENQI LI Wenqi.Li@nottingham.ac.uk
Senior Research Fellow



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.

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

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