基于单谐振结构的金属裂纹CRFID传感器设计

为实现单结构谐振器对金属裂纹参数的无损检测，设计了一款同时检测裂纹宽度及方向的无芯片射频识别(CRFID)金属裂纹传感器。将圆形、切角矩形谐振器一体化设计，利用HFSS有限元分析软件对传感器进行结构优化与性能仿真。深层次探究了不同裂纹缺陷下传感器雷达散射截面(RCS)的响应特征。结果表明金属结构的裂纹方向和裂纹宽度可以通过传感器谐振频率的变化进行识别。双极化下RCS幅频特性的频偏方向对应裂纹的方向，而频偏量与裂纹宽度成正比。设计的CRFID传感器能够检测0°水平方向、90°竖直方向、45°或135°斜向等三类方向下的亚毫米宽度裂纹，其中裂纹宽度检测灵敏度最高可达43.5 MHz/0.1 mm。

Design of metal crack CRFID sensor based on single resonant structure

A Chip-less Radio Frequency Identification (CRFID) metal crack sensor with a single resonant structure is proposed to simultaneously detect crack width and direction. The circular and the rectangle with tangent corners resonators are integrated into the design, and the electromagnetic simulation software HFSS is utilized to optimize the structure and simulate the performance of the sensor. The response characteristics of Radar Cross Section (RCS) of the sensor under different defect cracks are studied systematically. It is found that frequency shift is proportional to the crack width. The results show that the crack direction and crack width on the metal structure can be identified by the change of the resonant frequency of the sensor. The frequency shift direction in RCS amplitude-frequency characteristics in the two polarization directions correspond to the direction of the crack, and the resonant frequency shift is proportional to the crack width. The CRFID sensor can detect cracks in submillimeter width in three directions: 0°(horizontal), 90°(vertical), 45° or 135°(oblique), among which the crack detection sensitivity can reach up to 43.5 MHz/0.1 mm.