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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Detection and High-Precision Positioning of Liquid Droplets Using SAW Systems
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Detection and High-Precision Positioning of Liquid Droplets Using SAW Systems

机译：使用声表面波系统检测和高精度定位液滴

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The capability to accurately handle liquids in small volumes is a key point for the development of lab-on-chip devices. In this paper, we investigate an application of surface acoustic waves (SAW) for positioning micro-droplets. A SAW device based on a 2 times 2 matrix of inter-digital transducers (IDTs) has been fabricated on a (YXl)/128deg LiNbO3 substrate, which implies displacement and detection in two dimensions of droplets atop a flat surface. Each IDT operates at a given frequency, allowing for an easy addressing of the active channel. Furthermore, very low cross-talk effects were observed as no frequency mixing arose in our device. Continuous as well as pulsed excitations of the IDTs have been studied, yielding, respectively, continuous and step-by-step droplet displacement modes. In addition, we also have used these two excitation types to control the velocity and the position of the droplets. We also have developed a theoretical analysis of the detection mode, which has been validated by experimental assessment.
机译：精确处理小体积液体的能力是开发芯片实验室设备的关键。在本文中，我们研究了表面声波（SAW）在微滴定位中的应用。已经在（YXl）/ 128度LiNbO3基板上制造了基于2倍于2的叉指换能器（IDT）矩阵的SAW器件，这意味着在平坦表面顶部的二维液滴中进行位移和检测。每个IDT都以给定的频率工作，从而可以轻松寻址活动通道。此外，由于在我们的设备中未出现混频，因此观察到非常低的串扰效应。已经对IDT的连续和脉冲激发进行了研究，分别得出了连续和逐步的液滴位移模式。此外，我们还使用了这两种激发类型来控制液滴的速度和位置。我们还对检测模式进行了理论分析，该分析已通过实验评估得到验证。

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