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Enhancement of Ultrasonic Guided Wave Signals Using a Split-Spectrum Processing Method

1
TWI Ltd., Granta Park, Great Abington, Cambridge CB21 6AL, UK
2
Brunel University London, Institute of Materials and Manufacturing, Kingston Lane, Uxbridge UB8 3PH, UK
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(10), 1815; https://doi.org/10.3390/app8101815
Received: 10 August 2018 / Revised: 24 September 2018 / Accepted: 29 September 2018 / Published: 3 October 2018
(This article belongs to the Special Issue Ultrasonic Guided Waves)
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Abstract

Ultrasonic guided wave (UGW) systems are broadly utilised in several industry sectors where the structural integrity is of concern, in particular, for pipeline inspection. In most cases, the received signal is very noisy due to the presence of unwanted wave modes, which are mainly dispersive. Hence, signal interpretation in this environment is often a challenging task, as it degrades the spatial resolution and gives a poor signal-to-noise ratio (SNR). The multi-modal and dispersive nature of such signals hampers the ability to detect defects in a given structure. Therefore, identifying a small defect within the noise level is a challenging task. In this work, an advanced signal processing technique called split-spectrum processing (SSP) is used firstly to address this issue by reducing/removing the effect of dispersive wave modes, and secondly to find the limitation of this technique. The method compared analytically and experimentally with the conventional approaches, and showed that the proposed method substantially improves SNR by an average of 30 dB. The limitations of SSP in terms of sensitivity to small defects and distances are also investigated, and a threshold has been defined which was comparable for both synthesised and experimental data. The conclusions reached in this work paves the way to enhance the reliability of UGW inspection. View Full-Text
Keywords: signal processing; SNR; split-spectrum processing; ultrasonic guided waves signal processing; SNR; split-spectrum processing; ultrasonic guided waves
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Pedram, S.K.; Mudge, P.; Gan, T.-H. Enhancement of Ultrasonic Guided Wave Signals Using a Split-Spectrum Processing Method. Appl. Sci. 2018, 8, 1815.

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