为实现无线检测金属结构裂纹的宽度和深度,设计了一款无芯片射频识别(Radio Frequency Identification,RFID)金属裂纹传感器.该设计采用开口环谐振器(Split Ring Resonators,SRR)、电耦合LC谐振器(ELC谐振器)作为主要传感单元,在2～4.5 GHz的工作频带内实现双谐振.利用双谐振频率f1和f2在裂纹宽度和深度检测中的差异性,获得金属裂纹的宽度和深度信息.仿真和实测结果表明,增大裂纹宽度时,谐振频率f1和f2同时减小,增大裂纹深度时,f2减小而f1几乎不变.在实际测量中,f对宽度检测的灵敏度达到82.5 MHz/mm,2 mm样本的相对误差在3％以内.f2对深度检测的灵敏度达到50 MHz/mm,1 mm和3 mm样本的相对误差分别在20％和6.7％以内,验证了传感器检测毫米级裂纹宽度和深度的可行性.
A Chipless RFID Sensor for Metal Crack Width and Depth Detection
To achieve wireless detection of the width and depth of cracks in metal structures,a chipless Radio Frequency Identification(RFID)metal crack sensor is designed.The sensor utilizes Split Ring Resonators(SRR)and Electrically Coupled LC(ELC)resonators as primary sensing units,achieving dual resonance within operating frequency range of 2 GHz to 4.5 GHz.By exploiting the differences between and f2 in crack width and depth detection,information about width and depth of metal cracks can be obtained.Simulation and experimental results indicate that when crack width increases,both resonance frequencies f1 and f2 decrease simultaneously.When crack depth increases,f2 decreases while f1 remains almost unchanged.In practical measurements,the sensitivity of f1 for width detection reaches 82.5 MHz/mm,with a relative error of less than 3％for the 2 mm sample.The sensitivity of f2 for depth detection reaches 50 MHz/mm,and the relative errors for 1 mm and 3 mm samples are within 20％and 6.7％,respectively.This confirms the sensor's capability to detect millimeter-level crack width and depth.
万方数据
维普
