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Electrostatic Acoustic Sensor with an Impedance-Matched Diaphragm Characterized for Body Sound Monitoring.

Valerie Rennoll1, Ian McLane1, Adebayo Eisape1

  • 1Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States.

ACS Applied Bio Materials
|July 20, 2023
PubMed
Summary

Researchers developed acoustic sensors with matched acoustic impedance for better sound capture. This innovation improves wearable body sound monitoring by enhancing body sound sensitivity and reducing noise interference.

Keywords:
acoustic impedance matchingacoustic sensorbiomedical acousticsbody sound monitoringsensor design

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Area of Science:

  • Materials Science
  • Acoustics
  • Biomedical Engineering

Background:

  • Acoustic sensors capture more energy when their acoustic impedance matches the probed medium.
  • Controlling polymer acoustic impedance involves material selection and nanoparticle addition.

Purpose of the Study:

  • To examine the impact of polymer type and nanoparticle addition on acoustic sensor fabrication.
  • To achieve desired acoustic impedances in the range of 1-2.2 MRayls for enhanced sensor performance.
  • To optimize sensors for body sound monitoring with improved coherence and noise rejection.

Main Methods:

  • Statistical methodology and design of experiments approach.
  • Fabrication of sensors with varying diaphragm acoustic impedances.
  • Excitation with acoustic vibrations through wood, gelatin, and plastic.
  • Optimization for body sound monitoring and evaluation on an acoustic phantom.
  • Comparison with electronic stethoscopes with noise cancellation.

Main Results:

  • Impedance-matched sensors show high sensitivity to body sounds and low sensitivity to airborne sound.
  • The sensor's frequency response is comparable to state-of-the-art electronic stethoscopes.
  • Successful capture of lung and heart sounds from a real subject.
  • Demonstrated high sensitivity and noise rejection in simulated environments.

Conclusions:

  • The impedance-matched sensor offers an improved solution for wearable body sound monitoring.
  • Its design is suitable for sensing various mediums with acoustic impedances between 1-2.2 MRayls.
  • The sensor's small size, flexible materials, and noise rejection enhance its utility.