Natural focusing inspection for pipes by frequency tuning

Li Zhang, Joseph Lawrence Rose, Brian J. Gavigan

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

1 Citation (Scopus)

Abstract

The energy of ultrasonic guided waves may be focused in pipes by utilizing a partially loaded excitation. This focusing technique is called "natural focusing", which can be used to improve a defect's sensitivity to ultrasonic guided waves. However, it is possible that there are a few natural focal points within the inspection range at a particular frequency. Consequently, some defects could be missed. The location of the natural focal points, however, changes with frequency. This phenomenon was theoretically predicted and experimentally confirmed. In this paper, the natural focusing inspection technique is investigated. Although a very limited circumferential length might be covered by a naturally focused profile at a single excitation frequency, the entire cross sectional area of the pipe can be inspected when a range of frequencies is employed. Hence, the natural focusing inspection technique can sufficiently inspect the entire pipe with frequency tuning.

Original languageEnglish (US)
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation Volume 24
Pages1557-1562
Number of pages6
Volume760
DOIs
StatePublished - Apr 9 2005
EventReview of Progress in Quantitative Nondestructive Evaluation - Golden, CO, United States
Duration: Jul 25 2004Jul 30 2004

Other

OtherReview of Progress in Quantitative Nondestructive Evaluation
CountryUnited States
CityGolden, CO
Period7/25/047/30/04

Fingerprint

inspection
tuning
ultrasonics
defects
excitation
sensitivity
profiles
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zhang, L., Rose, J. L., & Gavigan, B. J. (2005). Natural focusing inspection for pipes by frequency tuning. In Review of Progress in Quantitative Nondestructive Evaluation Volume 24 (Vol. 760, pp. 1557-1562) https://doi.org/10.1063/1.1916855
Zhang, Li ; Rose, Joseph Lawrence ; Gavigan, Brian J. / Natural focusing inspection for pipes by frequency tuning. Review of Progress in Quantitative Nondestructive Evaluation Volume 24. Vol. 760 2005. pp. 1557-1562
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Zhang, L, Rose, JL & Gavigan, BJ 2005, Natural focusing inspection for pipes by frequency tuning. in Review of Progress in Quantitative Nondestructive Evaluation Volume 24. vol. 760, pp. 1557-1562, Review of Progress in Quantitative Nondestructive Evaluation, Golden, CO, United States, 7/25/04. https://doi.org/10.1063/1.1916855

Natural focusing inspection for pipes by frequency tuning. / Zhang, Li; Rose, Joseph Lawrence; Gavigan, Brian J.

Review of Progress in Quantitative Nondestructive Evaluation Volume 24. Vol. 760 2005. p. 1557-1562.

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

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AB - The energy of ultrasonic guided waves may be focused in pipes by utilizing a partially loaded excitation. This focusing technique is called "natural focusing", which can be used to improve a defect's sensitivity to ultrasonic guided waves. However, it is possible that there are a few natural focal points within the inspection range at a particular frequency. Consequently, some defects could be missed. The location of the natural focal points, however, changes with frequency. This phenomenon was theoretically predicted and experimentally confirmed. In this paper, the natural focusing inspection technique is investigated. Although a very limited circumferential length might be covered by a naturally focused profile at a single excitation frequency, the entire cross sectional area of the pipe can be inspected when a range of frequencies is employed. Hence, the natural focusing inspection technique can sufficiently inspect the entire pipe with frequency tuning.

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Zhang L, Rose JL, Gavigan BJ. Natural focusing inspection for pipes by frequency tuning. In Review of Progress in Quantitative Nondestructive Evaluation Volume 24. Vol. 760. 2005. p. 1557-1562 https://doi.org/10.1063/1.1916855