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

Alexander J. Reardon; Daniel S. Kazal; Brian M. Cullum

doi:10.1117/12.2660764

14 June 2023 Temporal dynamics and spatial imaging of thermally-induced optical reflection of sound (THORS) barriers (Conference Presentation)

Alexander J. Reardon, Daniel S. Kazal, Brian M. Cullum

Author Affiliations +

Proceedings Volume PC12548, Smart Biomedical and Physiological Sensor Technology XX; PC1254804 (2023) https://doi.org/10.1117/12.2660764
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

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.

Conference Presentation

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Alexander J. Reardon, Daniel S. Kazal, and 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://doi.org/10.1117/12.2660764

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KEYWORDS

Thermography

Imaging spectroscopy

Raman spectroscopy

Infrared imaging

Infrared radiation

Medium wave

Photoacoustic spectroscopy

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