Lamb wave sensors for detecting wall defects in pipes

Dongshan Guo, Tribikram Kundu

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

A number of sensors have been designed and fabricated for pipeline inspection. These sensors require commercially available ultrasonic transducers but use a new coupling mechanism. Some of these sensors require the presence of a coupling fluid between the ultrasonic transducer and the pipe. These sensors can inspect horizontal pipes. Other sensors use solid coupling medium and can be used equally well for inspecting horizontal, vertical or inclined pipes. Our objective is to generate different modes of the cylindrical guided waves in pipes. The new coupling mechanisms have been designed to generate different axisymmetric and non-axisymmetric Lamb modes in the pipe by changing the excitation frequency, inclination angle and number of transmitters. These Lamb wave sensors have been used to inspect a number of defect-free and defective pipes. The preliminary results show that these sensors can detect the pipe defects even when the defects are located at a distance. A comparison between the degree of damage and the Lamb wave generated received signal shows that a correlation exists between the two. Hence, this technique can be used for detecting the pipe damage as well as for predicting its degree of damage. Experimental results are presented to justify this claim.

Original languageEnglish (US)
Pages (from-to)610-618
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3995
StatePublished - Jan 1 2000
EventNondestructive Evaluation of Highways, Utilities, and Pipelines IV - Newport Beach, CA, USA
Duration: Mar 7 2000Mar 9 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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