Due to the lack of effective methodologies and instrumentation, limited studies have been conducted to analyze the tympanic membrane’s (TM, also known as eardrum) response under high-pressure blast waves. This research focuses on the characterization of a methodology that integrates high-speed 3D-Digital Image Correlation (HS 3D-DIC) and Schlieren imaging with a customized shock tube used for excitation to quantify rapid responses of the testing subject exposed to shock waves and their sound-matter interactions. The ultimate objective of our group’s research is to investigate the response and potential damage of human TM when exposed to high-level acoustic pressures. The system characterization encompasses the quantification of the shock tube’s output levels and repeatability, uncertainties in the full field-of-view measurement procedure, spatial and temporal resolutions of the imaging techniques, and the overall system limitations. By optimizing these parameters, we can enhance the reliability of high-speed imaging, ensuring accurate quantification of TM deformations during blast exposure. The accuracy of data obtained from HS 3D-DIC is validated by comparing them with simultaneous measurement by Laser Doppler Vibrometry. This study establishes a robust platform for comprehensive analysis of TM damage and fracture mechanics. Results showcase a validated full field-of-view measurement methodology from a real cadaveric human TM, including evaluation of its non-linear mechanical behaviors through dynamic responses and its interaction with overpressure blast waves. The tools we developed here will advance our understanding of blast-induced ear injuries and provide support for the development of effective protective measures and medical interventions.

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An Integrated High-Speed 3D-Digital Image Correlation and Schlieren Imaging Methodology for Studying Human Eardrums Exposed to Shock Waves

  • Anahita Alipanahi,
  • Jonathan Oliveira Luiz,
  • John J. Rosowski,
  • Cosme Furlong,
  • Jeffrey Tao Cheng

摘要

Due to the lack of effective methodologies and instrumentation, limited studies have been conducted to analyze the tympanic membrane’s (TM, also known as eardrum) response under high-pressure blast waves. This research focuses on the characterization of a methodology that integrates high-speed 3D-Digital Image Correlation (HS 3D-DIC) and Schlieren imaging with a customized shock tube used for excitation to quantify rapid responses of the testing subject exposed to shock waves and their sound-matter interactions. The ultimate objective of our group’s research is to investigate the response and potential damage of human TM when exposed to high-level acoustic pressures. The system characterization encompasses the quantification of the shock tube’s output levels and repeatability, uncertainties in the full field-of-view measurement procedure, spatial and temporal resolutions of the imaging techniques, and the overall system limitations. By optimizing these parameters, we can enhance the reliability of high-speed imaging, ensuring accurate quantification of TM deformations during blast exposure. The accuracy of data obtained from HS 3D-DIC is validated by comparing them with simultaneous measurement by Laser Doppler Vibrometry. This study establishes a robust platform for comprehensive analysis of TM damage and fracture mechanics. Results showcase a validated full field-of-view measurement methodology from a real cadaveric human TM, including evaluation of its non-linear mechanical behaviors through dynamic responses and its interaction with overpressure blast waves. The tools we developed here will advance our understanding of blast-induced ear injuries and provide support for the development of effective protective measures and medical interventions.