Coded excitation speeds up the detection of the fundamental flexural guided wave in coated tubes

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Song , X , Moilanen , P , Zhao , Z , Ta , D , Pirhonen , J , Salmi , A , Haeggström , E , Myllyla , R , Timonen , J & Wang , W 2016 , ' Coded excitation speeds up the detection of the fundamental flexural guided wave in coated tubes ' , AIP Advances , vol. 6 , no. 9 , 095001 . https://doi.org/10.1063/1.4962400

Title: Coded excitation speeds up the detection of the fundamental flexural guided wave in coated tubes
Author: Song, Xiaojun; Moilanen, Petro; Zhao, Zuomin; Ta, Dean; Pirhonen, Jalmari; Salmi, Ari; Haeggström, Edward; Myllyla, Risto; Timonen, Jussi; Wang, Weiqi
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-09
Language: eng
Number of pages: 8
Belongs to series: AIP Advances
ISSN: 2158-3226
URI: http://hdl.handle.net/10138/168845
Abstract: The fundamental flexural guided wave (FFGW) permits ultrasonic assessment of the wall thickness of solid waveguides, such as tubes or, e.g., long cortical bones. Recently, an optical non-contact method was proposed for ultrasound excitation and detection with the aim of facilitating the FFGW reception by suppressing the interfering modes from the soft coating. This technique suffers from low SNR and requires iterative physical scanning across the source-receiver distance for 2D-FFT analysis. This means that SNR improvement achieved by temporal averaging becomes time-consuming (several minutes) which reduces the applicability of the technique, especially in time-critical applications such as clinical quantitative ultrasound. To achieve sufficient SNR faster, an ultrasonic excitation by a base-sequence-modulated Golay code (BSGC, 64-bit code pair) on coated tube samples (1-5 mm wall thickness and 5 mm soft coating layer) was used. This approach improved SNR by 21 dB and speeded up the measurement by a factor of 100 compared to using a classical pulse excitation with temporal averaging. The measurement now took seconds instead of minutes, while the ability to determine the wall thickness of the phantoms was maintained. The technique thus allows rapid noncontacting assessment of the wall thickness in coated solid tubes, such as the human bone. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Subject: HOLLOW CYLINDER
LAMB WAVES
LONG BONES
ULTRASOUND
THICKNESS
114 Physical sciences
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