Ultrasonic guided wave phased array focusing in pipelines

Joseph Lawrence Rose, Paul Morrow, Li Zhang, Brian J. Gavigan

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


The two principal benefits of guided waves in pipeline inspection is inspection over long distances from a single probe position and the ability to inspect hidden structures and those under water, coatings, insulation, or concrete. In order to obtain an improved defect amplitude, signal to noise ratio, and penetration power, several focusing techniques were developed, including frequency tuning, natural focusing, and phased array focusing. Fundamental to the evolution of the focusing procedure was an understanding of nonaxisymmetric or flexural wave propagation in a hollow cylindrical structure. As a consequence, flexural longitudinal and torsional waves were studied by way of partial loading around the circumference of a pipe. In addition to phased array focusing via a convolution exercise, flexural waves are useful in beam natural focusing, defect reflection mode conversion studies, in the inspection of pipe with limited circumferential access, and also for elbow inspection and beyond. Theoretical principles will be outlined along with a series of experimental results that points out the significant advantages of beam focusing in pipeline inspection compared to current inspection techniques.

Original languageEnglish (US)
Title of host publicationIMAC-XXIII: Conference and Exposition on Structural Dynamics - Structural Health Monitoring
StatePublished - 2005
Event23rd Conference and Exposition on Structural Dynamics 2005, IMAC-XXIII - Orlando, FL, United States
Duration: Jan 31 2005Feb 3 2005


Other23rd Conference and Exposition on Structural Dynamics 2005, IMAC-XXIII
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering


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