Wavelet analysis of bender element signals

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Title: Wavelet analysis of bender element signals
Authors: Bonal, Julien
Donohue, Shane
McNally, Ciaran
Permanent link: http://hdl.handle.net/10197/2439
Date: 1-Mar-2012
Abstract: Accurate determination of shear wave arrival time using bender elements may be severely affected by a combination of near field effects and reflected waves. These may mask the first arrival of the shear wave, making its detection difficult in the time domain. This paper describes an approach for measuring the shear wave arrival time through analysis of the output signal in the time-scale domain using a multi-scale wavelet transform. The local maxima lines of the wavelet transform modulus are observed at different scales and all singularities are mathematically characterised, allowing subsequent detection of the singularity relating to the first arrival. Examples of the use of the approach on typical synthetic and experimental bender element signals are also supplied, and these results are compared to those from other time and frequency domain approaches. The wavelet approach is not affected by near field effects and instead is characterised by a relatively consistent singularity related to the shear wave arrival time, across a range of frequencies and noise levels.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: Institution of Civil Engineers/Thomas Telford Publishing
Copyright (published version): 2010 Thomas Telford Publishing Ltd.
Keywords: Wavelet;Bender element;Signal processing;Singularity
Subject LCSH: Wavelets (Mathematics)
Signal processing
Shear waves--Measurement
DOI: 10.1680/geot.9.P.052
Language: en
Status of Item: Peer reviewed
Appears in Collections:Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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