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Related Experiment Videos

Imaging using air-coupled polymer-membrane capacitive ultrasonic arrays.

A Neild1, D A Hutchins, D R Billson

  • 1School of Engineering, University of Warwick, Coventry CV4 7AL, UK.

Ultrasonics
|March 30, 2004
PubMed
Summary

Polymer-membrane capacitive ultrasonic arrays enable faster air-coupled imaging by replacing physical scanning with electronic multiplexing. This technology demonstrates potential for high-resolution imaging of composite materials.

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Area of Science:

  • Materials Science
  • Ultrasonic Imaging
  • Nondestructive Testing

Background:

  • Air-coupled ultrasonic imaging offers advantages over traditional methods.
  • Capacitive ultrasonic arrays (CUAs) provide a pathway for advanced imaging techniques.
  • Electronic multiplexing can significantly accelerate the imaging process.

Purpose of the Study:

  • To fabricate and evaluate polymer-membrane capacitive ultrasonic linear and 2-D arrays for air-coupled imaging.
  • To demonstrate the feasibility of through-thickness imaging of composite plates using 2-D arrays.
  • To explore the potential of larger arrays and advanced post-processing techniques for improved imaging accuracy.

Main Methods:

  • Fabrication of polymer-membrane capacitive ultrasonic linear and 2-D arrays.

Related Experiment Videos

  • Utilizing chirp drive signals and cross-correlation for data acquisition.
  • Simulating larger 2-D arrays with a scanned single receiver.
  • Employing synthetic aperture focusing technique (SAFT) and ellipse crossing for object localization.

    • Main Results:

    • Successful fabrication of polymer-membrane capacitive ultrasonic arrays for air-coupled applications.
    • Generation of a through-thickness air-coupled image of a composite plate using a 2-D array.
    • Demonstration of excellent imaging potential for larger 2-D arrays through simulation.
    • Accurate object localization achieved using two array receivers with SAFT and ellipse crossing.

    Conclusions:

    • Polymer-membrane capacitive ultrasonic arrays are suitable for air-coupled imaging, enabling faster scans.
    • Advanced signal processing techniques like chirp signals and cross-correlation are effective for air-coupled imaging.
    • Simulations and post-processing methods like SAFT show promise for high-resolution and accurate defect detection in composite materials.