In-line nondestructive inspection and classification of mechanical dents in a pipeline with SH wave EMATS

X. Zhao, V. Varma, G. Mei, H. Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

Circumferentially guided ultrasonic Shear Horizontal wave Electromagnetic Acoustic Transducer pairs in a through-transmission mode were used for detection and characterization of mechanical dents on the outer surface of a pipe from inside. A mobile fixture with a resolver is designed for the EMAT probes so that the sensor positions and waveforms are recorded as the platform goes through the pipe. Safety critical "cup" dents and relatively benign "saucer" dents of 25% of wall thickness and deeper were successfully detected and classified with the n1 mode SH wave and a support vector machine classifier. Dent depth estimation is also possible with a signal energy correlation approach.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 26
Pages144-151
Number of pages8
DOIs
StatePublished - 2007
EventREVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION - Portland, OR, United States
Duration: Jul 30 2006Aug 4 2006

Publication series

NameAIP Conference Proceedings
Volume894
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceREVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION
Country/TerritoryUnited States
CityPortland, OR
Period07/30/0608/4/06

Keywords

  • Mechanical dents
  • Pipeline inspection
  • SH EMAT
  • Support vector machines

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