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首页> 外文期刊>RSC Advances >Slowness curve surface acoustic wave transducers for optimized acoustic streaming
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Slowness curve surface acoustic wave transducers for optimized acoustic streaming

机译：用于优化声学流的缓慢曲线表面声波传感器

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摘要

Surface acoustic waves can induce force gradients on the length scales of micro- and nanoparticles, allowing precise manipulation for particle capture, alignment and sorting activities. These waves typically occupy a spatial region much larger than a single particle, resulting in batch manipulation. Circular arc transducers can focus a SAW into a narrow beam on the order of the particle diameter for highly localised, single-particle manipulation by exciting wavelets which propagate to a common focal point. The anisotropic nature of SAW substrates, however, elongates and shifts the focal region. Acousto-microfluidic applications are highly dependent on the morphology of the underlying substrate displacement and, thus, become dependent on the microchannel position relative to the circular arc transducer. This requires either direct measurement or computational modelling of the SAW displacement field. We show that the directly measured elongation and shift in the focal region are recapitulated by an analytical model of beam steering, derived from a simulated slowness curve for 128 degrees Y-cut lithium niobate. We show how the negative effects of beam steering can be negated by adjusting the curvature of arced transducers according to the slowness curve of the substrate, for which we present a simple function for convenient implementation in computational design software. Slowness-curve adjusted transducers do not require direct measurement of the SAW displacement field for microchannel placement and can capture smaller particles within the streaming vortices than can circular arc IDTs.
机译：表面声波可以诱导微型和纳米颗粒的长度尺度上的力梯度，允许精确操作粒子捕获，对准和分选活性。这些波通常占据大于单个颗粒的空间区域，导致批量操纵。圆弧换能器可以在粒径的顺序上将锯片聚焦到窄光束中，通过激励传播到共同焦点的激励小波来对粒径的粒径进行高度局部的单粒子操纵。然而，锯基板的各向异性性质，伸长并移位焦点区域。声学微流体应用高度依赖于底层基板位移的形态，从而取决于相对于圆弧换能器的微通道位置。这需要直接测量或锯位移场的计算建模。我们表明，通过光束转向的分析模型，衍生自用于128°Y切割锂铌酸锂的模拟缓慢曲线的分析模型，综合区域的直接测量伸长率和换档。我们展示了通过根据基板的缓慢曲线调整所产生的换能器的曲率来否定光束转向的负面影响如何，为此，我们在计算设计软件中提供了一种简单的实现。缓慢曲线调节的换能器不需要直接测量微通道放置的SAW位移场，并且可以在流涡流内捕获比可以圆弧IDTS的流涡流的较小颗粒。

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  • 来源
    《RSC Advances》 |2020年第20期|共8页
  • 作者

    ORorke Richard; Winkler Andreas; Collins David; Ai Ye;

  • 作者单位

    Singapore Univ Technol &

    Design Pillar Engn Product Dev Singapore Singapore;

    Leibniz Inst Solid State &

    Mat Res IFW Dresden Germany;

    Univ Melbourne Dept Biomed Engn Parkville Vic Australia;

    Singapore Univ Technol &

    Design Pillar Engn Product Dev Singapore Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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