电磁干扰对声表面波重量灵敏度的影响
Influence of electromagnetic interferences on the gravimetric sensitivity of surface acoustic waveguides
摘要：
声表面波在（生物）化学检测中的应用越来越受到人们的关注。表面质量改性导致波导的传播特性的可测量的变化。在各种各样的波导中，Love模式由于其高的重量灵敏度而被研究。由电换能器在波导中发射和检测的声学信号伴随有电磁波;这两个信号的相互作用很容易被传感器的开放结构增强，在传感器的传递函数中产生干涉图案。这些干扰的重量灵敏度的影响，从而整个传感器的结构建模。我们表明，电磁干扰产生的灵敏度的实验值的错误。该误差对于传感器的开环和闭环配置是不同的。理论方法是完成了一个实际的爱模式下的液体开环配置的传感器的实验。实验结果表明，相互作用依赖于频率和质量修改。
英文摘要：
Surface acoustic waveguides are increasing in interest for (bio)chemical detection. The surface mass modification leads to measurable changes in the propagation properties of the waveguide. Among a wide variety of waveguides, Love mode has been investigated because of its high gravimetric sensitivity. The acoustic signal launched and detected in the waveguide by electrical transducers is accompanied by an electromagnetic wave; the interaction of the two signals, easily enhanced by the open structure of the sensor, creates interference patterns in the transfer function of the sensor. The influence of these interferences on the gravimetric sensitivity is presented, whereby the structure of the entire sensor is modelled. We show that electromagnetic interferences generate an error in the experimental value of the sensitivity. This error is different for the open and the closed loop configurations of the sensor. The theoretical approach is completed by the experimentation of an actual Love mode sensor operated under liquid in open loop configuration. The experiment indicates that the interaction depends on the frequency and the mass modifications.
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