Radial modes of laterally stiffened piezoelectric disc transducers for ultrasonic collimated beam generation

Chillara, Vamshi Krishna; Pantea, Cristian; Sinha, Dipen N.

doi:10.1016/j.wavemoti.2017.07.005

Title: Radial modes of laterally stiffened piezoelectric disc transducers for ultrasonic collimated beam generation

Journal Article · Sat Jul 15 00:00:00 EDT 2017 · Wave Motion

DOI:https://doi.org/10.1016/j.wavemoti.2017.07.005· OSTI ID:1372799

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, we numerically investigate the resonance and vibration characteristics of radial modes of laterally stiffened piezoelectric disc transducers. Lateral stiffening is modeled using a spring and vibration characteristics of the piezo-disc are investigated with increasing lateral stiffness. It is found that the resonant frequency response of the radial modes follows an asymptotic behavior approaching that of a clamped disc with increasing lateral stiffness. The radial mode vibration pattern of the discs is also found to be affected by lateral stiffness. While the vibration pattern of a free disc corresponds to a Bessel function, laterally stiffened discs show edge-effects where they depart from the Bessel-like behavior. In addition, a fully clamped piezo-disc is found to have an extra side-lobe when compared to a free disc. Ultrasonic beam profiles generated from radial modes of laterally stiffened discs are numerically investigated. It is found that the free piezo-disc generates a Bessel beam that has multiple side-lobes. Increasing the lateral stiffness results in a significant reduction of side-lobes in the beam profile. This technique of generating a collimated beam with side-lobe reduction finds significant applications in imaging through concrete, drilling mud, and other highly attenuating materials.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1372799

Alternate ID(s):: OSTI ID: 1549578

Report Number(s):: LA-UR-17-22364

Journal Information:: Wave Motion, Vol. 76; ISSN 0165-2125

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Radial modes of laterally stiffened piezoelectric disc transducers for ultrasonic collimated beam generation

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References (21)

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