Research on Passive RFID Tag Antenna Sensor for Metal Structure Strain Detection

The long-term load bearing of metal structures will cause the deformation of the structure. Considering that the traditional methods of detecting the deformation of metal structures are mostly manual observation, this method has many shortcomings, such as information lag and inaccurate detection. In response to the above problems, a method of using the relative position of the tag antenna to characterize the change in the shape of the metal object is studied, the corresponding tag antenna sensor is designed, and a common commercial RFID reader is used to detect the actual effect. Experiments have proved that the tag antenna can be used to characterize the shape change of the metal object structure in the horizontal direction. The experimental data show that the detection accuracy can reach the centimeter level.