Article Article
Imaging of Nonaxisymmetric Area Discontinuities in Pipes Using Guided Wave Synthetic Focusing

The corrosion discontinuities that cause thickness loss in arbitrarily shaped areas are one of the major health problems for long-term operating pipes. In this paper, the guided wave synthetic focusing technique and deconvolution algorithm are used to reconstruct the images of area discontinuities in pipes. Firstly, the feasibility of this imaging technique is verified by numerical simulation. Two kinds of nonaxisymmetric area discontinuities are imaged: those with uniform thickness loss and those with progressive thickness loss. The axial length of an area discontinuity with uniform thickness loss can be quantitatively determined from the reconstructed image. As for the disconti-nuities with progressive thickness loss, the essential condition for guided wave reflection is the saltation of thickness-varying gradient. Secondly, the slices attached on the pipe and a scratch upon the pipe surface were imaged by experiment. The reconstructed discontinuity images successfully located the discontinuities and presented the discontinuities’ thickness-variation features.


Cawley, P., M.J.S. Lowe, F. Simonetti, C. Chevalier, and A.G. Roosen-brand, “The Variation of the Reflection Coefficient of Extensional Guided Waves in Pipes from Defects as a Function of Defect Depth, Axial Extent, Circumferential Extent and Frequency,” Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 216, No. 11, 2002, pp. 1131–1143.

Chen, Jian, Xiaolong Bai, Keji Yang, and Bing-Feng Ju, “An Ultrasonic Methodology for Determining the Mechanical and Geometrical Properties of a Thin Layer Using a Deconvolution Technique,” Ultrasonics, Vol. 53, No. 7, 2013, pp. 1377–1383.

Cole, I.S., and D. Marney, “The Science of Pipe Corrosion: A Review of the Literature on the Corrosion of Ferrous Metals in Soils,” Corrosion Science, Vol. 56, 2012, pp. 5–16.

Davies, Jacob, and Peter Cawley, “The Application of Synthetic Focusing for Imaging Crack-like Defects in Pipelines using Guided Waves,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 56, No. 4, 2009, doi: 10.1109/TUFFC.2009.1098.

Demma, A., P. Cawley, M. Lowe, and A.G. Roosenbrand, “The Reflection of the Fundamental Torsional Mode from Cracks and Notches in Pipes,” Journal of the Acoustical Society of America, Vol. 114, No. 2, 2003, pp. 611–625. 

Demma, A., P. Cawley, M. Lowe, A.G. Roosenbrand, and B. Pavlakovic, “The Reflection of Guided Waves from Notches in Pipes: A Guide for Interpreting Corrosion Measurements,” NDT & E International, Vol. 37, No. 3, 2004, pp. 167–180.

Ditri, J.J., and J.L. Rose, “Excitation of Guided Elastic Wave Modes in Hollow Cylinders by Applied Surface Tractions,” Journal of Applied Physics, Vol. 72, No. 7, 1992, doi: 10.1063/1.351558.

Eason, T.J., L.J. Bond, and M.G. Lozev, “Structural Health Monitoring Ultrasonic Thickness Measurement Accuracy and Reliability of Various Time-of-Flight Calculation Methods,” AIP Conference Proceedings, Vol. 1706, No. 1, 2016, doi: 10.1063/1.4940647.

Eason, T.J., L.J. Bond, and M.G. Lozev, “Ultrasonic Thickness Structural Health Monitoring Photoelastic Visualization and Measurement Accuracy for Internal Pipe Corrosion,” SPIE Proceedings, Vol. 9439, 2015, doi: 10.1117/12.2084223.

Gazis, Denos C., “Three-Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation,” The Journal of the Acoustical Society of America, Vol. 31, No. 5, 1959, doi: 10.1121/1.1907753, published online July 2005.

Hayashi, Takahiro, and Morimasa Murase, “Defect Imaging with Guided Waves in a Pipe,” The Journal of the Acoustical Society of America, Vol. 117, No. 4, 2005, doi: 10.1121/1.1862572.

Huthwaite, Peter, and Matthias Seher, “Robust Helical Path Separation for Thickness Mapping of Pipes by Guided Wave Tomography,” IEEE Trans-actions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 62, No. 5, 2015, pp. 927–938.

Kroll, Andreas, “A Survey on Mobile Robots for Industrial Inspections,” Intelligent Autonomous Systems 10, IOS Press, Amsterdam, Netherlands, 2008, doi: 10.3233/978-1-58603-887-8-406.

Leonard, Kevin R., and Mark K. Hinders, “Guided Wave Helical Ultrasonic Tomography of Pipes,” The Journal of the Acoustical Society of America, Vol. 114, No. 2, 2003, doi: 10.1121/1.1593068.

Li, J., and J.L. Rose, “Angular-Profile Tuning of Guided Waves in Hollow Cylinders Using a Circumferential Phased Array,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 49, No. 12, 2002, pp. 1720–1729.

Lowe, P.S., R. Sanderson, N.V. Boulgouris, and T.H. Gan, “Hybrid Active Focusing with Adaptive Dispersion for Higher Defect Sensitivity in Guided Wave Inspection of Cylindrical Structures,” Nondestructive Testing and Evaluation, Vol. 31, No. 3, 2016, pp. 219–234.

Shukla, A., and H. Karki, “A Review of Robotics in Onshore Oil-gas Industry,” 2013 IEEE International Conference on Mechatronics and Automa-tion (ICMA), Takamatsu, Japan, 4–7 August 2013, published online 2013.

Sun, Zeqing, Anyu Sun, and Bing-Feng Ju, “Deconvolution Imaging of Weak Reflective Pipe Defects Using Guided-Wave Signals Captured by a Scanning Receiver,” Review of Scientific Instruments, Vol. 88, No. 2, 2017, doi: 10.1063/1.4976742.

Taheri, H., K.M. Ladd, F. Delfanian, and J. Du, “Phased Array Ultrasonic Technique Parametric Evaluation for Composite Materials,” ASME 2014 International Mechanical Engineering Congress and Exposition, Vol. 13, 2014, doi: 10.1115/IMECE2014-36945.

Zhu, Wenhao, “An FEM Simulation for Guided Elastic Wave Generation and Reflection in Hollow Cylinders with Corrosion Defects,” Journal of Pressure Vessel Technology, Vol. 124, No. 1, 2001, pp. 108–117.

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