Wireless interrogation of passive antenna sensors
Wireless interrogation of passive antenna sensors
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DOI：
10.1088/0957-0233/21/3/035201
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发表时间：
2010-03-01
影响因子：
2.4
通讯作者：
Huang, H.
中科院分区：
文献类型：
--
作者：
Deshmukh, S.;Huang, H.
最近，我们发现微带贴片天线的谐振频率对机械应变或地平面中存在的裂纹敏感。基于这一原理，天线传感器已被证明可以测量金属结构中的应变和检测裂纹。提出了一种双频天线传感器的无线遥测方法。使用询问喇叭天线以线性啁啾微波信号照射天线传感器。通过在传感器节点处实现光激活开关并执行反向散射信号的信号处理，可以远程测量天线传感器沿沿着两个极化的谐振频率。由于天线传感器不需要本地电源，并且可以无线询问，因此可以消除电线。传感器的实现，信号处理和实验装置，验证天线传感器的远程询问。还建立了功率预算模型，以估计最大询问范围。
Recently, we discovered that the resonant frequency of a microstrip patch antenna is sensitive to mechanical strains or crack presence in the ground plane. Based on this principle, antenna sensors have been demonstrated to measure strain and detect crack in metallic structures. This paper presents a wireless method to remotely interrogate a dual-frequency antenna sensor. An interrogation horn antenna was used to irradiate the antenna sensor with a linear chirp microwave signal. By implementing a light-activated switch at the sensor node and performing signal processing of the backscattered signals, the resonant frequencies of the antenna sensor along both polarizations can be measured remotely. Since the antenna sensor does not need a local power source and can be interrogated wirelessly, electric wiring can be eliminated. The sensor implementation, the signal processing and the experimental setup that validate the remote interrogation of the antenna sensor are presented. A power budget model has also been established to estimate the maximum interrogation range.