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Nondestructive Evaluation (NDE): Auralization of Ultrasonic Signals for the Detection of Corrosion FREE

[+] Author Affiliations
Amos E. Holt, Glenn M. Light

Southwest Research Institute, San Antonio, TX

Paper No. 97-AA-066, pp. V001T13A042; 5 pages
doi:10.1115/97-AA-066
From:
  • ASME 1997 Turbo Asia Conference
  • ASME 1997 Turbo Asia Conference
  • Singapore, September 30–October 2, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7867-5
  • Copyright © 1997 by ASME

abstract

During nondestructive evaluation (NDE), an instrument is used to receive inspection signals and display them for visual interpretation. Southwest Research Institute (SwRI) has developed technology that allows NDE signals generated from conventional ultrasonic instrumentation to be completely converted into audible (aural) signals to enhance reliability of evaluation through the use of two senses (ears and eyes) to improve inspection reliability.

For example, detection of hidden corrosion on aircraft structures using conventional ultrasonic testing (UT) techniques is difficult because of thin walls and corrosion topography. These characteristics require use of high-frequency, high-spatial-resolution transducers to attempt to detect backwall signal amplitude. It is difficult to visually discriminate backwall signals of thin wing structure from the normal ringdown of the transducer.

Using aural UT, a trained inspector can listen to sounds generated by aural UT equipment and detect the presence of hidden corrosion with higher reliability than using conventional UT.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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