首页|集成铁氧体的LC应变传感器的设计及测试

集成铁氧体的LC应变传感器的设计及测试

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针对金属环境下采用LC无线无源应变传感器出现电磁信号传输失效的问题,在传感器背面集成铁氧体材料,其原理是通过抑制电磁波在金属表面的涡流效应产生的感应电动势,实现在金属环境下的电磁信号耦合测试.通过HFSS软件进行仿真验证,在金属环境下LC无线无源传感器信号失效;在传感器基底背部集成铁氧体后,通过扫频得出铁氧体可以在金属环境下实现LC传感器的电磁信号传输.对铁氧体的厚度进行参数优化,最佳厚度为0.32mm.搭建等强度悬臂梁测试平台,结果表明,金属环境下LC传感器可以通过铁氧体实现抗金属环境干扰,频率为37.7 MHz时,LC无线无源测试系统可以很好地实现信号传输,对应的S11值为-25.6dB.对悬臂梁施加外力使其发生应变,传感器在0 ～ 1 300με的应变范围内灵敏度为61.54 Hz/με.测试结果表明,铁氧体有利于实现金属环境下的LC无线无源传感器应变测试.
Design and test of LC wireless passive strain sensor integrated with ferrite
To solve the problem of electromagnetic signal transmission failure caused by LC wireless passive strain sensor in metal environment, ferrite material is integrated on the back of the sensor. The principle is to realize electromagnetic signal coupling test in metal environment by suppressing induced electromotive force generated by eddy current effect of electromagnetic wave on metal surface. Through simulation verification of HFSS software, LC wireless passive sensor signal failure in metal environment. After adding ferrite to the back of sensor base, it is concluded that ferrite can realize electromagnetic signal transmission of LC sensor in metal environment through frequency sweep. The optimum thickness of ferrite is 0.32 mm. The test platform of equal strength cantilever beam was built. The results show that LC sensor can resist metal environment interference through ferrite in metal environment. When the frequency is 37.7 MHz, LC wireless passive test system can realize signal transmission well, and the corresponding S11 value is -25.6 dB. The sensitivity of the sensor is 61.54 Hz/με in the strain range from 0 to 1 300 με. The test results show that ferrite is beneficial to realize the strain measurement of LC wireless passive sensor in metal environment.

LC strain sensornon-contact measurementwireless passivityelectromagnetic couplinganti-metal interferenceabsorbing materialstrain measurement

郝竹雅、张磊、谢浩、谭秋林

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中北大学省部共建动态测试技术国家重点实验室,山西太原 030051

LC应变传感器 非接触测量 无线无源 电磁耦合 抗金属干扰 吸波材料 应变测试

国家自然科学基金青年科学基金国家自然科学基金创新研究团队项目山西省应用基础研究计划青年项目山西省留学回国人员科技活动择优资助项目

52105594518210032021030212427420210011

2024

10.19304/J.ISSN1000-7180.2023.0261

微电子学与计算机
中国航天科技集团公司第九研究院第七七一研究所

微电子学与计算机

CSTPCD
影响因子：0.431
ISSN：1000-7180
年,卷(期)：2024.41(3)
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