@article{Huthwaite:2015:10.1109/TUFFC.2014.006884,
author = {Huthwaite, P and Seher, M},
doi = {10.1109/TUFFC.2014.006884},
journal = {IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control},
pages = {927--938},
title = {Robust Helical Path Separation for Thickness Mapping of Pipes by Guided Wave Tomography},
url = {http://dx.doi.org/10.1109/TUFFC.2014.006884},
volume = {62},
year = {2015}
}

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TY  - JOUR
AB  - Pipe wall loss caused by corrosion can be quantifiedacross an area by transmitting guided Lamb waves throughthe region and measuring the resulting signals. Typically thedispersive relationship for these waves, which means thatwave velocity is a known function of thickness, is exploited,enabling the wall thickness to be determined from a velocityreconstruction. The accuracy and quality of this reconstructionis commonly limited by the angle of view available from thetransducer arrays. These arrays are often attached as a pairof ring arrays on either side of the inspected region, and dueto the cylindrical nature of the pipe, waves are able to travelin an infinite number of helical paths between any two transducers.The first arrivals can be separated relatively easily bytime gating, but by using just these components the angle ofview is severely restricted. To improve the viewing angle, it isnecessary to separate the wavepackets. This paper provides anoutline of a separation approach: initially the waves are backpropagatedto their source to align the different signals, then afiltering technique is applied to select the desired components.The technique is applied to experimental data and demonstratedto robustly separate the signals
AU  - Huthwaite,P
AU  - Seher,M
DO  - 10.1109/TUFFC.2014.006884
EP  - 938
PY  - 2015///
SN  - 1525-8955
SP  - 927
TI  - Robust Helical Path Separation for Thickness Mapping of Pipes by Guided Wave Tomography
T2  - IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
UR  - http://dx.doi.org/10.1109/TUFFC.2014.006884
UR  - http://hdl.handle.net/10044/1/24021
VL  - 62
ER  - 

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