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Acoustic Meta-stethoscope for Cardiac Auscultation by Chen, Zheng-Ji; Liu, Jing-Jing; Liang, Bin; Yang, Jing; Cheng, Jian-Chun is a scholarly article available to read on EtoBox.

What is Acoustic Meta-stethoscope for Cardiac Auscultation about?

Straight cylindrical stethoscopes serve as an important alternative to conventional stethoscopes whose application in the treatment of infectious diseases might be limited by the use of protective clothing. Yet their miniaturization is challenging due to the low-frequency of bioacoustics signal. Here, we design and experimentally implement a meta-stethoscope with subwavelength size, simple fabrication, easy assembly yet high sensitivity, which simply comprises multiple round perforated plate units and a cylindrical shell. We elucidate our proposed mechanism by analytically deriving the frequency response equation, which proves that the equivalent acoustic propagation path is substantially increased by the high-index metamaterial, enabling downscaling of the meta-stethoscope to subwavelength footprint. The acoustic performance of meta-stethoscope is experimentally characterized by monitoring the cardiac auscultation on clothed human body. The simulated and measured results agree well, with both showing the expected enhancement of sensitivity of our proposed meta-stethoscope (~ 10 dB) within the predicted working frequency range from 80 to 130 Hz despite its compactness and simplicit

Author

Chen, Zheng-Ji; Liu, Jing-Jing; Liang, Bin; Yang, Jing; Cheng, Jian-Chun

Published

2023

Language

EN