Temporal Dynamics and Spatial Imaging of THermally-induced Optical Reflection of Sound (THORS) Barriers

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Temporal dynamics and spatial imaging of thermally-induced optical reflection of sound (THORS) barriers (Conference Presentation).pdf (136.4 KB)

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https://www.spiedigitallibrary.org/conference-proceedings-of-spie/PC12548/PC1254804/Temporal-dynamics-and-spatial-imaging-of-thermally-induced-optical-reflection/10.1117/12.2660764.full

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https://orcid.org/0009-0002-8638-4713
 https://orcid.org/0000-0002-5250-8290

Date

2023-06-14

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conference papers and proceedings
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Citation of Original Publication

Alexander J. Reardon, Daniel S. Kazal, Brian M. Cullum, "Temporal dynamics and spatial imaging of thermally-induced optical reflection of sound (THORS) barriers (Conference Presentation)," Proc. SPIE PC12548, Smart Biomedical and Physiological Sensor Technology XX, PC1254804 (14 June 2023); https://www.spiedigitallibrary.org/conference-proceedings-of-spie/PC12548/PC1254804/Temporal-dynamics-and-spatial-imaging-of-thermally-induced-optical-reflection/10.1117/12.2660764.full

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© 2023 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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Abstract

Thermally Induced Optical Reflection of Sound (THORS) is a novel technique that allows a user to optically manipulate sound waves in a medium by photothermally exciting that medium with infrared light, thereby creating a transient barrier due to the changes in compressibility of the medium. This phenomenon offers numerous potential applications in fields as varied as acoustic suppression and reflection, photoacoustic spectroscopy and imaging, and ultrasonic waveguiding. Previous results have revealed maximum suppression efficiencies as great as 72 ± 5% using a continuous THORS barrier system with a multi-pulsed carbon monoxide laser operating at 5.5 ± 0.25 μm and 1 ms pulses. To greater understand the spatial variations in medium compressibility between the excited medium and the surrounding environment, we have employed Raman imaging to visualize these barriers.