Nonlinear Sound Field by Interdigital Transducers in Water

Maezawa, Miyuki; Kamada, Rui; Kamakura, Tomoo; Matsuda, Kazuhisa

doi:10.1143/jjap.47.4076

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…An introduction to piezoelectric materials (Friend and Yeo, 2008a) is provided elsewhere, and certainly there are some exemplary reference works in this area (Auld, 1973;Milsom et al, 1977;Hashimoto, 2000;Royer and Dieulesaint, 2000;Xiao and Bhattacharya, 2008) for learning more about modeling acoustic wave propagation in solid piezoelectric media. A challenging aspect of proper analysis is the possibility of a variety of wave types appearing in a piezoelectric material from one form of excitation, or as a consequence of the presence of a fluid on the piezoelectric substrate (Maezawa et al, 2008). Although we focus upon Rayleigh waves here in the analysis, shear-horizontal surface acoustic waves [SH-SAW (Hashimoto and Yamaguchi, 2001)], surface-skimming bulk waves [SSBW, (Lewis, 1977)], leaky SAW and Scholte waves, by Schröder and Scott, Jr. (2001) and Zarembo and Krasil'nikov (1960), Sezawa waves (Kushibiki et al, 1990), pseudo-SAW (Adler, 1994), and many others may appear and indeed may be used in applications in lieu of the Rayleigh wave.…”

Section: Acoustic Wave Propagation In Piezoelectric Materialsmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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This article reviews acoustic microfluidics: the use of acoustic fields, principally ultrasonics, for application in microfluidics. Although acoustics is a classical field, its promising, and indeed perplexing, capabilities in powerfully manipulating both fluids and particles within those fluids on the microscale to nanoscale has revived interest in it. The bewildering state of the literature and ample jargon from decades of research is reorganized and presented in the context of models derived from first principles. This hopefully will make the area accessible for researchers with experience in materials science, fluid mechanics, or dynamics. The abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques common in microfluidics, along with the many applications in microfluidics and nanofluidics that appear through the literature.

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Section: Acoustic Wave Propagation In Piezoelectric Materialsmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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“…We used theoretical values as a reference for evaluating measurements because many theoretical analyses have given results that are in reasonable agreement with measurements of nonlinear sound propagation and formed fields. 15,[39][40][41] This may not always be valid. In addition, there is a possibility that the variability of several decibels between the used microphones affected the results.…”

Section: Discussionmentioning

confidence: 99%

Influence of microphone characteristics on demodulated sound measurement in near field of parametric loudspeaker

Nomura

Sato

2022

Jpn. J. Appl. Phys.

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This study evaluates the accuracy of demodulated sound measurements using a condenser microphone in the near field of a parametric loudspeaker system. Microphones with different sensitivities placed at incidence angles of 0° and 90° were used to measure demodulation frequency components without special acoustic filters. The measured components were compared with theoretical predictions. The results show that the measured sound pressure using microphones placed at 0° was up to several tens of decibels larger than the theoretical predictions and significantly inaccurate in the near field. This was due to the nonlinear response of the microphone, which had high sensitivity at primary sound frequencies, inducing spurious signals. This result suggests that using a microphone with low sensitivity at primary sound frequencies placed at an appropriate angle that reduces sensitivity improves parametric sound measurement accuracy.

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An effective T-cells separation method in an acoustofluidic platform using a concave–convex electrode design

Khorshidian,

Targhi,

Darbari

et al. 2024

Physics of Fluids

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This study addresses the growing interest in developing new acoustophoresis designs for efficient particle separation, introducing a novel concave–convex electrode design for lymphocyte separation. Initially, a numerical model for acoustophoresis was employed and validated against existing experimental results in the literature with a 4% variance, based on the finite element method. Furthermore, in order to ensure the accuracy of the performed simulations, a mesh independency approach was employed for the piezoelectric substrate, alongside an investigation into resonant frequencies across the computational domain. These analyses were conducted to ensure that the results approximate experimental findings more closely and identify the frequency at which the maximum surface displacement occurs, making the results empirically reliable. As a major innovation, a new concentric concave–convex electrode design was introduced, and then the separation distance of targeted particles, as the goal parameter, was studied relative to the geometrical design and acoustofluidic operation parameters of the microfluidic chip. Through numerical analysis, the flow rate ranging from 7 to 14 μl/min and the applied radio frequency signal amplitude ranging from 16 to 26 V were investigated simultaneously. Results demonstrated the microfluidic chip's capability to function effectively across the entire range of voltage and flow rates examined. At the chip's highest operational point, with a flow rate of 13 μl/min and an applied radio frequency signal amplitude of 24 V, particle separation distance reached up to 380 μm. Under similar flow rates, cell conditions, and microchannel length, the particle separation distance has been improved by about 26% as compared with the standard electrode pattern, revealing a significant enhancement in separation efficiency and output purity. Moreover, due to the predominantly radial propagation of the acoustic waves and the expanding acoustic aperture, the resultant standing wave pattern spans a greater length of the microchannel. Assuming a constant injection velocity, this consequently extends the effective exposure time of particles to the acoustic radiation force, allowing for an increase in Stokes drag force. Given that drag force increases with velocity, it enables the opportunity to introduce higher input flow rates and throughput.

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Nonlinear Sound Field by Interdigital Transducers in Water

Cited by 4 publications

References 11 publications

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Influence of microphone characteristics on demodulated sound measurement in near field of parametric loudspeaker

An effective T-cells separation method in an acoustofluidic platform using a concave–convex electrode design

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