Measuring the wavenumber of guided modes in waveguides with linearly varying thickness

Autor: Pascal Laugier, Maryline Talmant, Ludovic Moreau, Jean-Gabriel Minonzio
Přispěvatelé: Laboratoire d'Imagerie Paramétrique (LIP), Université Pierre et Marie Curie - Paris 6 (UPMC)-IFR58-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2014
Předmět:
Models
Anatomic
Materials science
Acoustics and Ultrasonics
Quantitative Biology::Tissues and Organs
Acoustics
Wavelet Analysis
01 natural sciences
Bone and Bones
Acoustic dispersion
030218 nuclear medicine & medical imaging
law.invention
03 medical and health sciences
0302 clinical medicine
Optics
Arts and Humanities (miscellaneous)
law
0103 physical sciences
Singular value decomposition
Dispersion (optics)
medicine
Humans
Wavenumber
010301 acoustics
Ultrasonography
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph]
Signal processing
Fourier Analysis
business.industry
Signal Processing
Computer-Assisted
Models
Theoretical
Elasticity
Radius
Sound
medicine.anatomical_structure
Cortical bone
Glass
Tomography
X-Ray Computed
business
Constant (mathematics)
Waveguide
Algorithms
Zdroj: Journal of the Acoustical Society of America
Journal of the Acoustical Society of America, Acoustical Society of America, 2014, 135 (5), pp.2614-2624. ⟨10.1121/1.4869691⟩
Journal of the Acoustical Society of America, 2014, 135 (5), pp.2614-2624. ⟨10.1121/1.4869691⟩
ISSN: 0001-4966
1520-8524
DOI: 10.1121/1.4869691
Popis: International audience; Measuring guided waves in cortical bone arouses a growing interest to assess skeletal status. In most studies, a model of waveguide is proposed to assist in the interpretation of the dispersion curves. In all the reported investigations, the bone is mimicked as a waveguide with a constant thickness, which only approximates the irregular geometry of cortical bone. In this study, guided mode propagation in cortical bone-mimicking wedged plates is investigated with the aim to document the influence on measured dispersion curves of a waveguide of varying thickness and to propose a method to overcome the measurement limitations induced by such thickness variations. The singular value decomposition-based signal processing method, previously introduced for the detection of guided modes in plates of constant thickness, is adapted to the case of waveguides of slowly linearly variable thickness. The modification consists in the compensation at each frequency of the wavenumber variations induced by the local variation in thickness. The modified method, tested on bone-mimicking wedged plates, allows an enhanced and more accurate detection of the wavenumbers. Moreover, the propagation in the directions of increasing and decreasing thickness along the waveguide is investigated.
Databáze: OpenAIRE
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