Novel Nanocomposite Materials for Improving Passive Layers in Air-coupled Ultrasonic Transducer Applications

Amoroso, Lorena; Ramadas, Sivaram Nishal; Klieber, Christoph; Álvarez-Arenas, Tomás Gómez; McNally, Tony

doi:10.1109/ultsym.2019.8925712

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…There is a small selection of materials that can alleviate a UT-load mismatch and even those with a suitable impedance can be excessively attenuating, or unsuitable for mounting and deployment [1] [4] [5] [6] [7]. A cascade of intermediate IMLs increase the UT's bandwidth [8] [9] [10] [11] but multiple sections compound the problem of material scarcity and introduces the issue of joining with adhesives.…”

Section: Introductionmentioning

confidence: 99%

Generating characteristic acoustic impedances with hydrogel based phononic crystals for use in ultrasonic transducer matching layers

Daly

Windmill

Jackson

2021

The Journal of the Acoustical Society of America

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Quarter wavelength acoustic impedance matching layers (IMLs) are often attached to an ultrasonic transducer (UT) to enhance energy transmission into a load medium. Natural materials are rarely suitable as an IML but even composites with a suitable impedance can be excessively attenuating, or unsuitable for UT mounting. It would be beneficial then, if a non-absorptive IML with the specified impedance could be manufactured using common fabrication tools. Recent publications have shown that phononic crystal (PC) structures, made using modern printing and curing technology, can operate as IMLs and may satisfy these criteria. It is important to continue this research because it has the potential to improve UT performance, and simplify or surpass existing solutions. Here, finite element analysis (FEA) is used to validate a hydrogel-matrix / steel-inclusion PC IML that separates PZT and water domains. The PZT boundary is excited over a frequency range and the resultant in water pressure is averaged. Results are compared with an ideal, bulk IML and common, in practice materials. Comparison of spectra demonstrate that the PC increases in water pressure at the expected frequency, is an effective medium in the long wavelength regime, and is comparable to the ideal IML.

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Section: Introductionmentioning

confidence: 99%

Generating characteristic acoustic impedances with hydrogel based phononic crystals for use in ultrasonic transducer matching layers

Daly

Windmill

Jackson

2021

The Journal of the Acoustical Society of America

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“…Acoustic properties of typical piezoelectric transducer materials and media[154][155][156][157][158][159][160].Material Typical Function ρ (kg/m 3 ) c (m/s) Z ACO =ρc (MRayl) Attenuation or Loss 1.64 (dB/cm.MHz)…”

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confidence: 99%

A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers

Rathod

2020

Sensors

159

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The coupling of waves between the piezoelectric generators, detectors, and propagating media is challenging due to mismatch in the acoustic properties. The mismatch leads to the reverberation of waves within the transducer, heating, low signal-to-noise ratio, and signal distortion. Acoustic impedance matching increases the coupling largely. This article presents standard methods to match the acoustic impedance of the piezoelectric sensors, actuators, and transducers with the surrounding wave propagation media. Acoustic matching methods utilizing active and passive materials have been discussed. Special materials such as nanocomposites, metamaterials, and metasurfaces as emerging materials have been presented. Emphasis is placed throughout the article to differentiate the difference between electric and acoustic impedance matching and the relation between the two. Comparison of various techniques is made with the discussion on capabilities, advantages, and disadvantages. Acoustic impedance matching for specific and uncommon applications has also been covered.

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Review of conventional and advanced non-destructive testing techniques for detection and characterization of small-scale defects

Silva

Malitckii

Santos

et al. 2023

Progress in Materials Science

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Novel Nanocomposite Materials for Improving Passive Layers in Air-coupled Ultrasonic Transducer Applications

Cited by 5 publications

References 9 publications

Generating characteristic acoustic impedances with hydrogel based phononic crystals for use in ultrasonic transducer matching layers

Generating characteristic acoustic impedances with hydrogel based phononic crystals for use in ultrasonic transducer matching layers

A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers

Review of conventional and advanced non-destructive testing techniques for detection and characterization of small-scale defects

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