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将无线射频识别技术(RFID)引入结构健康监测领域,提出了利用传感标签和读写器实现结构健康无线监测的新方法。以埋入环氧树脂复合材料结构中具有一定规格和布局的NiTi形状记忆合金(SMA)超弹丝作为电容器的电极,分布的RFID传感标签实时获取形状记忆合金丝间的微小电容信号,并将其与时间、位置编码信息打包后无线传输给读写器和监控站点。对两种SMA增强复合材料层合板,分别在万能材料试验机和冲击试验机上进行了拉伸、弯曲和冲击实验,结果表明,系统能实现对埋入结构中NiTi超弹性传感元件的高精度监测,并具有功能扩展方便、路由选择与定位简单的特点。
Introducing Radio Frequency Identification (RFID) technology into the field of structural health monitoring, a new method of implementing structural health and wireless monitoring using sensor tag and reader is proposed. NiTi shape memory alloy (SMA) superelastic wire with a certain size and layout is embedded in the epoxy resin composite structure as the electrode of the capacitor. The distributed RFID sensor tag realizes the tiny capacitance signal between the shape memory alloy wires in real time It will be packaged with the time and location coding information wirelessly transmitted to the reader and monitoring site. Tensile, bending and impact tests on the two kinds of SMA reinforced composite laminates were carried out on a universal material testing machine and an impact testing machine respectively. The results show that the system can achieve high precision of NiTi superelastic sensor in embedded structure Monitoring, and has the features of easy expansion, routing and positioning features simple.