Novel surface acoustic wave (SAW) sensor platforms with electrode-free sensing surface are being investigated for use in applications in which the sensing environment may be conducting or corrosive. It is shown that, by using a system of four grating arrays, the IDT generated SAW can be directed to the opposite surface where it interacts with a chemical sensing medium before being directed back to the electroded surface. The design principles of these grating-based SAW sensor platforms are discussed. The signal quality and the mass sensitivity of the devices are analyzed and compared to those of a direct path SAW using chemical vapor deposited thin polymer films. Experimental results are presented for the detection of nitrogen dioxide (NO/sub 2/) in sub-ppm concentrations on devices fabricated on YZ-LiNbO/sub 3/ plates.
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机译:具有无电极传感表面的新型表面声波(SAW)传感器平台正在研究中,以用于传感环境可能具有导电性或腐蚀性的应用中。已显示,通过使用四个光栅阵列的系统,IDT生成的SAW可以定向到相对的表面,在与SADS相互作用之前,它会与化学传感介质相互作用,然后再定向回到电极化的表面。讨论了这些基于光栅的声表面波传感器平台的设计原理。分析了设备的信号质量和质量灵敏度,并与使用化学气相沉积的聚合物薄膜的直接路径SAW的信号质量和质量灵敏度进行了比较。提出了在YZ-LiNbO / sub 3 /板上制造的装置上检测亚ppm浓度的二氧化氮(NO / sub 2 /)的实验结果。
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