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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
08:21

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Published on: May 11, 2014

Nondestructive testing using air-borne ultrasound.

David K Hsu1

  • 1Center for NDE, Iowa State University, Ames, IA 50014, USA. dkhsu@iastate.edu <dkhsu@iastate.edu>

Ultrasonics
|June 30, 2006
PubMed
Summary
This summary is machine-generated.

Air-borne ultrasound technology enables non-contact inspection of aerospace composites. This paper details air-coupled ultrasonic measurement fundamentals, defect detection, and introduces a field-deployable imaging system.

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustics

Background:

  • Advancements in transducer efficiency over 20 years facilitate air-borne ultrasound.
  • Air-borne ultrasound enables non-contact, non-contaminating inspection of aerospace materials.
  • Composite laminates and honeycomb structures are critical in the aerospace industry.

Purpose of the Study:

  • To present the fundamentals of air-borne ultrasonic measurements.
  • To highlight unique considerations for ultrasound propagation in air and solids.
  • To discuss defect detection and imaging in composite and honeycomb structures.

Main Methods:

  • Characterization of transducer beam profiles.
  • Analysis of thickness dependence and resonance effects in air-coupled ultrasound transmission.
  • Development of a manual scan system for field-based ultrasonic imaging.

Main Results:

  • Demonstration of air-borne ultrasonic principles for material inspection.
  • Illustration of defect detection and imaging in solid laminates and honeycomb.
  • Introduction of a practical system for on-site aircraft inspection.

Conclusions:

  • Air-borne ultrasound is a viable technique for inspecting aerospace structures.
  • Understanding propagation characteristics is key for effective air-coupled measurements.
  • The developed system supports field deployment for aircraft integrity assessment.