Effect of flow through soil embedded pipes for damage detection using guided wave techniques and short time fourier transform

R. Ahmad, T. Kundu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In non-destructive testing methods, guided wave techniques are often used for detecting damages in structures. For pipes, cylindrical Guided waves can be used for this purpose. Investigations that have been carried out at the University of Arizona to detect defects in underground pipes are reported in this paper. Cylindrical guided waves are generated by piezo-electric transducers. Guided waves are propagated through pipes that are buried in the soil by placing transmitters on one end of the pipe and the receivers on the other end. The recorded signals are then processed using 2-D Short Time Fourier Transform (STFT) or Gabor Transform. Gabor transform maps the time-amplitude signal into a two dimensional time frequency signal which provides information about both when and at what frequency a signal arrives. In other words, Gabor Transformation provides information about the group velocities of the signal. From the experiments, signals were obtained for both with flow and without How conditions for buried pipes. These signals are then processed using Gabor Transformation to identify propagating modes by comparing experimental results with theoretical group velocities. An effort has been made to show how the flow through the pipes affects the propagating modes.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring 2007
Subtitle of host publicationQuantification, Validation, and Implementation - Proceedings of the 6th International Workshop on Structural Health Monitoring, IWSHM 2007
EditorsFu-Kuo Chang
PublisherDEStech Publications
Pages1676-1684
Number of pages9
ISBN (Electronic)9781932078718
StatePublished - Jan 1 2007
Event6th International Workshop on Structural Health Monitoring: Quantification, Validation, and Implementation, IWSHM 2007 - Stanford, United States
Duration: Sep 11 2007Sep 13 2007

Publication series

NameStructural Health Monitoring 2007: Quantification, Validation, and Implementation - Proceedings of the 6th International Workshop on Structural Health Monitoring, IWSHM 2007
Volume2

Other

Other6th International Workshop on Structural Health Monitoring: Quantification, Validation, and Implementation, IWSHM 2007
CountryUnited States
CityStanford
Period9/11/079/13/07

Keywords

  • Damage detection
  • Gabor transform
  • Guided wave
  • Pipe inspection
  • Short time fourier transform
  • Signal processing
  • Ultrasonic transducers

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Information Management

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  • Cite this

    Ahmad, R., & Kundu, T. (2007). Effect of flow through soil embedded pipes for damage detection using guided wave techniques and short time fourier transform. In F-K. Chang (Ed.), Structural Health Monitoring 2007: Quantification, Validation, and Implementation - Proceedings of the 6th International Workshop on Structural Health Monitoring, IWSHM 2007 (pp. 1676-1684). (Structural Health Monitoring 2007: Quantification, Validation, and Implementation - Proceedings of the 6th International Workshop on Structural Health Monitoring, IWSHM 2007; Vol. 2). DEStech Publications.