Towards efficient surface acoustic wave (SAW)-based microfluidic actuators
Towards efficient surface acoustic wave (SAW)-based microfluidic actuators
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DOI：
10.1016/j.sna.2016.06.006
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发表时间：
2016-08
影响因子：
4.6
通讯作者：
A. Winkler;R. Brünig;C. Faust;R. Weser;H. Schmidt
中科院分区：
文献类型：
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作者：
A. Winkler;R. Brünig;C. Faust;R. Weser;H. Schmidt
基于表面声波（SAW）的致动器的适用性被证明用于各种微流体任务，包括流体混合、颗粒分离、局部加热或流体雾化。但是，由于传统上的主要应用领域在于高频电信，SAW器件仅针对微流体进行了边缘优化，特别是在节能操作方面。在结合基于SAW的微流体致动器的实验室设置中，例如由具有不充分电阻抗的叉指换能器（IDT）、血管壁中SAW功率的吸收或失调波长导致的能量效率不足通常简单地通过信号源的输出功率的增加来抵消。然而，对于便携式或高度集成的设备的操作，或者对于具有高功率需求的设备，能量效率是至关重要的。此外，一个低效的操作模式可能会导致严重的设备degradation.In为了延长SAW执行器的性能，我们讨论了不同的方法，就其功率效率的优化，并提供了选定的实验结果，突出的重要性，执政功率损耗的影响。根据预期的微流体任务，可以组合几种已证明的优化策略，并且如将示出的，可以实现装置性能的相当大的改进。
The applicability of surface acoustic wave (SAW) based actuators was demonstrated for a variety of microfluidic tasks, including fluid mixing, particle separation, localized heating or fluid atomization. But as traditionally the main field of application lies in high-frequency telecommunication, SAW devices are only marginally optimized for microfluidics, especially in respect to an energy efficient operation. In lab setups incorporating SAW-based microfluidic actuators, insufficient energy efficiency resulting e.g. from interdigital transducers (IDTs) with inadequate electrical impedance, absorption of SAW power in vessel walls or maladjusted wavelengths, is often simply counteracted by an increase of the output power of the signal source. For the operation of portable or highly integrated devices, though, or for devices with high power needs, energy efficiency is crucial. Additionally, an inefficient mode of operation can result in severe device degradation.In order to extend the performance of SAW actuators, we discuss different approaches regarding the optimization of their power efficiency and provide selected experimental results, highlighting the importance of the governing power loss effects. Depending on the intended microfluidic task, several of the demonstrated optimization strategies can be combined and – as will be shown – considerable improvements in the device performance can be achieved.