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Research Papers: NDE

A Time-Reversal Defect-Identifying Method for Guided Wave Inspection in Pipes

[+] Author and Article Information
Fei Deng, Cunfu He

College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing, 100022, P.R.C.

Bin Wu1

College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing, 100022, P.R.C.wb@emails.bjut.edu.cn

1

Corresponding author.

J. Pressure Vessel Technol 130(2), 021503 (May 13, 2008) (8 pages) doi:10.1115/1.2892029 History: Received January 18, 2007; Revised November 20, 2007; Published May 13, 2008

The temporal-spatial focusing effect of the time-reversal method on the guided wave inspection in pipes was investigated theoretically in the current research with a transfer function. The amplitude of the time-reversed wave propagating along the pipes was not only determined by the characteristics of the defect and the location for observation but also by the location of the time-reversal transducers. Especially, the quantity of transducers distributed around the pipe in the circumferential direction was found to be important in applying such time-reversal method. The results demonstrate that the time-reversal method can be used to enhance the inspection energy for the guided wave inspection in pipes and to locate the defects in the circumferential directions. Once the time-reversed signals obtained from the guided wave inspection are applied on a numerical model, the defects can be recognized by the motion of the time-reversed wave transmitting along the pipe model. Numerical simulation and experimental results are provided in this paper to illustrate the validity of such defect-identifying method.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Spatial representation of pipe with a defect

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Figure 2

The pipe model with one crack

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Figure 3

(a) Typical signals received by a monitor node, the intercepting window used to record the defect echo; (b) 48 typical recording signals reflected by a defect; (c) time-reversed versions of these recording signals for reemitting

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Figure 6

Block diagram of experimental apparatus

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Figure 7

Typical detection signal received by a time-reversal transducer

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Figure 8

Applied time reversed signals on finite element model

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Figure 9

Typical superimposed result of 48 received signals at 800mm

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Figure 10

Experiment snapshot of the pipe with two cracks

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Figure 4

Snapshot of the pipe with one circumferential crack

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Figure 5

Snapshot of the pipe with two circumferential cracks

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