Advertisement

Effects of Pulse Distortion on Phase Velocity Measurements Using the Zero-Crossing Shift Technique

  • Y. Li
  • R. B. Thompson
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

One of the technique that is often used in the measurement of phase velocities of guided elastic modes is the zero-crossing shift technique. Using this technique, one measures time delays (usually through a counter) of a specific zero-crossing for a number of different separation distances of two transducers. The phase velocity Vp is computed as the slope of the distance-delay plot. For non-dispersive waves, this produces no problem as the pulse retains its shape as it propagates.

Keywords

Phase Velocity Pulse Envelope Texture Characterization Lamb Mode Pulse Distortion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    R. B. Thompson, S. S. Lee, and J. F. Smith, Ultrasonics 25, 133 (1987).CrossRefGoogle Scholar
  2. 2.
    R. B. Thompson, J. F. Smith, S. S. Lee, and G. C. Johnson, “A Comparison of Ultrasonic and X-ray determinations of Texture in Thin Cu and Al plates”, Met. Trans.Google Scholar
  3. 3.
    R. B. Thompson and R. K. Elsley, “A Prototype EMAT System for Inspection of Steam Generator Tubing”, report for Research Project 5101–1, EPRI NP-2836, 1983 ( Electric Power Research Institute, Palo Alto, California).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Y. Li
    • 1
  • R. B. Thompson
    • 1
  1. 1.Ames LaboratoryIowa State UniversityAmesUSA

Personalised recommendations