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21 - Guided Wave Imaging Methods

Published online by Cambridge University Press:  05 July 2014

Joseph L. Rose
Joseph L. Rose
Affiliation:
Pennsylvania State University
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Summary

Guided wave imaging methods are extremely popular and useful for evaluating defect locations and sizes in guided wave inspection. Interpretation is easier and preferred when compared to studying complex RF waveforms. Images are generally reconstructed from the RF waveforms in a variety of ways. A few imaging methods are discussed here, including the following:

  1. Guided Wave through Transmission Dual Probe Imaging

  2. Defect Locus Map

  3. Guided Wave Tomographic Imaging

  4. Guided Wave Phased Array in Plates

  5. Long-Range Ultrasonic Guided Wave Pipe Inspection Images

Introduction

Imaging methods in nondestructive evaluation (NHM) are preferred whenever possible, compared to results presented in RF waveform format. Imaging results are easier to read, to interpret, and to convince others of a result. RF waveforms can be complex and difficult to analyze, often calling for sophisticated signal processing and pattern recognition analysis. As a result, a discussion of several guided wave imaging methods are presented in this chapter.

Guided Wave through Transmission Dual Probe Imaging

A number of guided wave through transmission dual probe configurations have been used for defect imaging purposes. The two probes are fairly close together and scan from one to eight inches apart. The idea stems from an acousto-ultrasonic approach by Vary (1987). At that time, two normal beam probes were placed close to each other and an ultrasonic signature of the test piece was taken that often depicted a good or bad character of the component being tested. The method was also developed to assist in acoustic emission development programs where a sending transducer was used to imitate an acousto emission signal for subsequent capture and analysis by an acoustic emission sensor and analysis system.

Type
Chapter
Information
Ultrasonic Guided Waves in Solid Media , pp. 402 - 420
Publisher: Cambridge University Press
Print publication year: 2014

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References

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  • Guided Wave Imaging Methods
  • Joseph L. Rose, Pennsylvania State University
  • Book: Ultrasonic Guided Waves in Solid Media
  • Online publication: 05 July 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107273610.023
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  • Guided Wave Imaging Methods
  • Joseph L. Rose, Pennsylvania State University
  • Book: Ultrasonic Guided Waves in Solid Media
  • Online publication: 05 July 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107273610.023
Available formats
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Save book to Google Drive

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  • Guided Wave Imaging Methods
  • Joseph L. Rose, Pennsylvania State University
  • Book: Ultrasonic Guided Waves in Solid Media
  • Online publication: 05 July 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107273610.023
Available formats
×