Minimum Entropy Deconvolution of Guided Wave Signals in Pipe Inspection

Abstract:

It is difficult to achieve high resolution for guided wave signals used in pipe inspection. The main reasons include overlap of the reflected waves, diversity of the guided wave’s mode and so on. This paper presents a minimum entropy deconvolution algorithm to solve the problem caused by low resolution of the measured signals. Some experiments were carried out to validate the algorithm. The experimental set-up consists of two pipes, one excitor and two accelerometers. The excitor was used to generate the guided wave signals. Two accelerometers were attached to the pipe end and pipe wall respectively，and were used to measure the guided wave signals. Results show that good estimate of the reflection coefficient is obtained and the resolution of measured signals has been improved. As a result, the length of two pipe samples has been calculated with a reasonable accuracy and the position of the defect in experimental pipe has also been acertained. All of these show a new efficient way for guided wave signal processing in pipe inspection.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 6403-6408
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.6403
• Online since: January 2012
• Authors: Chang Feng Wang, Yan Feng Geng
• Keywords: Guided Wave, Minimum Entropy Deconvolution, Pipe Inspection

References

[1] J.L. Rose, Ultrasonic waves in solid media. University Press, Cambridge, (1999).

[2] J. Barshinger, J.L. Rose, M.J. Avioli, Jr., Guided wave resonance tuning for pipe inspection, Journal of Pressure Vessel Technology, vol. 124, Aug. 2002, pp.303-310, doi: 10. 1115/1. 1491580.

DOI: 10.1115/1.1491580

[3] P. Cawley, M.J. S Lowe, D.N. Alleyne, B. Pavlakovic and P. Ilcox, Practical long range guided wave testing : Application to pipes and rails, Materials Evaluation, vol. 61, 2003, pp.66-74.

[4] H. Kwun, S.Y. Kim, M.S. Choi, S.M. Walker, Torsional guided-wave attenuation in coal-tar-enamel-coated, buried piping, NDT&E International, vol. 37, pp.663-665, May (2004).

DOI: 10.1016/j.ndteint.2004.05.003

[5] Joon-Hyun Lee, Seung-Joon Lee, Application of laser-generated guided wave for evaluaton of corrosion in carbon steel pipe, NDT&E International, vol. 42, 2009, pp.222-227.

DOI: 10.1016/j.ndteint.2008.09.011

[6] Liang Wei, Lei Hua-ming, and Que Pei-wen, Sparsity enhancement for blind deconvolution of ultrasonic signals in nondestructive testing application, Rev. Sci. Instrum., vol. 79, pp.1-4, Dec. (2007).

DOI: 10.1063/1.2836263

[7] R.A. Wiggins, Minimum entropy deconvolution, Geoexploration, vol. 16, 1978, pp.21-35.

DOI: 10.1016/0016-7142(78)90005-4

[8] N. Sawalhi, R.B. Randall, H. Endo, The enhancement of fault detection and diagnosis in rolling element bearings using minimum entropy deconvolution combined with spectral kurtosis, Mechanical Systems and Signal Processing, vol. 21, pp.2616-2633, Dec. (2009).

DOI: 10.1016/j.ymssp.2006.12.002

[9] H. Endo, R.B. Randall, Enhancement of autoregressive model based gear tooth fault detection technique by the use of minimum entropy deconvolution filter, Mechanical Systems and Signal Processing, vol. 21, pp.2616-2633, Feb. (2009).

DOI: 10.1016/j.ymssp.2006.02.005