Beam-steering ultrasonic guided waves in a bone-mimicking plate by time-delaying the excitation of the elements in a multi-element array: a numerical study

Abstract We present a numerical simulation of the beam-steering of ultrasonic guided waves in an isotropic and viscoelastic solid plate, which mimics bovine cortex. The excitation was modeled by a group of five finite-size emitters, each exercised a normal force to the bone plate. Beam steering was...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 60; no. SD; p. SDDE20
Main Authors Nguyen, Hoai T.-L., Nguyen, Vu-Hieu, Bui, Quyen T.-L., Nguyen, Kim-Cuong T., Phan, Haidang, Le, Lawrence H.
Format Journal Article
LanguageEnglish
Published Tokyo IOP Publishing 01.07.2021
Japanese Journal of Applied Physics
Japan Society of Applied Physics
Subjects
Acoustics
Axial Transmission
Beam Steering
Bioengineering
Bone Quantitative Ultrasound
Computer simulation
Emitters
Engineering Sciences
Excitation
Finite Element Method
Imaging
Life Sciences
Mathematical models
Mechanics
Phase velocity
Phased Array
Solid mechanics
Traveling waves
Ultrasonic Guided Wave
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Summary:Abstract We present a numerical simulation of the beam-steering of ultrasonic guided waves in an isotropic and viscoelastic solid plate, which mimics bovine cortex. The excitation was modeled by a group of five finite-size emitters, each exercised a normal force to the bone plate. Beam steering was achieved by delaying the emitters’ firing. The simulation technique was implemented by a semi-analytical finite element scheme to compute the wave fields. At small steering angles, the simulated time-offset signals show mainly two groups of arrivals. The first group is the fast-traveling and high-frequency bulk waves and the second one is slow-traveling and low-frequency guided waves. The fast-traveling waves gradually diminish with increasing steering angles, in agreement with the excitation function of the source influence theory. The frequency-phase velocity dispersion maps also illustrate the phenomenon. The study has demonstrated that the lowest order Lamb asymmetrical mode, A 0 , which is useful for bone characterization, can best be excited when the cortical bone thickness is thin, the beam angle is large, and the excited frequency is low.
Bibliography:JJAP-S1102115.R2
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/abf74f