TY - GEN
T1 - Natural focusing inspection for pipes by frequency tuning
AU - Zhang, Li
AU - Rose, Joseph L.
AU - Gavigan, Brian J.
PY - 2005/4/9
Y1 - 2005/4/9
N2 - 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.
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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U2 - 10.1063/1.1916855
DO - 10.1063/1.1916855
M3 - Conference contribution
AN - SCOPUS:33748552736
SN - 0735402450
SN - 9780735402454
T3 - AIP Conference Proceedings
SP - 1557
EP - 1562
BT - Review of Progress in Quantitative Nondestructive Evaluation Volume 24
T2 - Review of Progress in Quantitative Nondestructive Evaluation
Y2 - 25 July 2004 through 30 July 2004
ER -