Ultrasonic guided wave focusing beyond welds in a pipeline

Li Zhang, Wei Luo, Joseph Lawrence Rose

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

14 Citations (Scopus)

Abstract

Ultrasonic guided wave inspection techniques are well-known for the inability to scan a long range axial distance of a pipe from a single transducer position. A phased array focusing technique was developed to improve the ultrasonic guided wave inspection results by concentrating the energy onto a defect. Focusing can increase the energy impinging onto the defects, reduce false alarm ratio, locate the defects, and enhance the propagation distance of the guided waves. An ultrasonic system with n (n>1) individual excitation channels is required to achieve phased array focusing. When phased array focusing was carried out, time delays and amplitude factors were applied to control the input signals for each excitation channel. Different from the time delays for bulk wave linear array focusing, the time delays and amplitude factors for guided wave array focusing are non-linear functions of the focal distance, the pipe size, excitation conditions, and the active frequency. A challenge of this technique is to focus beyond welds, defects, or other obstructions. The influence of axisymmetric welds is investigated with 3D FEM simulations and an experimental example. The theoretical analysis and experiments shows that although welds usually decrease the penetration energy, a limited number of welds rarely affects the phased array focal location.

Original languageEnglish (US)
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25A
Pages877-884
Number of pages8
Volume820 I
DOIs
StatePublished - Mar 6 2006
EventReview of Progress in Quantitative Nondestructive - Brunswick, ME, United States
Duration: Jul 31 2005Aug 5 2005

Other

OtherReview of Progress in Quantitative Nondestructive
CountryUnited States
CityBrunswick, ME
Period7/31/058/5/05

Fingerprint

ultrasonics
phased arrays
time lag
defects
inspection
excitation
concentrating
false alarms
linear arrays
energy
transducers
penetration
propagation
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zhang, L., Luo, W., & Rose, J. L. (2006). Ultrasonic guided wave focusing beyond welds in a pipeline. In Review of Progress in Quantitative Nondestructive Evaluation: Volume 25A (Vol. 820 I, pp. 877-884) https://doi.org/10.1063/1.2184618
Zhang, Li ; Luo, Wei ; Rose, Joseph Lawrence. / Ultrasonic guided wave focusing beyond welds in a pipeline. Review of Progress in Quantitative Nondestructive Evaluation: Volume 25A. Vol. 820 I 2006. pp. 877-884
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Zhang, L, Luo, W & Rose, JL 2006, Ultrasonic guided wave focusing beyond welds in a pipeline. in Review of Progress in Quantitative Nondestructive Evaluation: Volume 25A. vol. 820 I, pp. 877-884, Review of Progress in Quantitative Nondestructive, Brunswick, ME, United States, 7/31/05. https://doi.org/10.1063/1.2184618

Ultrasonic guided wave focusing beyond welds in a pipeline. / Zhang, Li; Luo, Wei; Rose, Joseph Lawrence.

Review of Progress in Quantitative Nondestructive Evaluation: Volume 25A. Vol. 820 I 2006. p. 877-884.

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

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Zhang L, Luo W, Rose JL. Ultrasonic guided wave focusing beyond welds in a pipeline. In Review of Progress in Quantitative Nondestructive Evaluation: Volume 25A. Vol. 820 I. 2006. p. 877-884 https://doi.org/10.1063/1.2184618