微带贴片天线应变传感器优化设计研究
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北京工业大学机械工程及应用电子技术学院北京100124

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TP73TH86

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国家自然科学基金(51575015,51505013,51235001)项目资助


Design and optimization of a strain sensor based on rectangular microstrip patch antenna
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College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China

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    摘要:

    承载部件作为高端装备中最常见的结构单元,在役过程中受载荷和应力集中影响极易萌生裂纹,导致结构失效,实时监测结构关键部件的应变状态对保障结构健康至关重要。基于微波无损检测技术,揭示了矩形微带贴片天线的辐射元尺寸对其固有谐振频率的影响规律,探究了微带贴片天线谐振频率与应变的相互作用机理。矩形微带贴片天线可激发单频和双频谐振频率,改变矩形辐射元的长度或宽度,其谐振频率会发生频移。实验结果表明,当对金属接地板施加一定拉应力时,贴片天线几何尺寸会发生改变,其谐振频率也随之发生偏移,据此可推算出金属接地板的应变大小,这对关键承载部件的应变和裂纹实时监测具有重要的研究意义。

    Abstract:

    Loadbearing structures are the most common structural components in highend equipment. The loading and stress concentration easily initiates cracks, leading to structural failure. Meanwhile, the realtime monitoring of strain is essential for the health evaluation of structures. In this paper, the influence on the natural resonant frequency by the size of the Rectangular Microstrip Patch Antennas (RMPA) is revealed, based on microwave nondestructive testing technology. Furthermore, the interaction mechanism between the resonant frequency of RMPA and the strains is explored. RMPA can radiate at one or two resonant frequencies. The resonant frequency shifts as the length or width of RMPA varies. Thus, when a tensile stress is applied on the grounded metal sheet of RMPA, the geometrical dimension changes, which induces the resonant frequency shift. This phenomenon can predict the strain of the grounded metal sheet inversely. This is of great importance to the strain and crack monitoring of key loadbearing structures.

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何存富,闫天婷,宋国荣,吕炎,吴斌.微带贴片天线应变传感器优化设计研究[J].仪器仪表学报,2017,38(2):361-367

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  • 在线发布日期: 2017-07-20
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