Passive flexible chipless RFID strain detection method and system

The invention discloses a crack detection method and device, relates to a displacement detection technology, in particular to a crack detection technology, and is characterized in that under the control of a main controller, an RFID reader continuously sends out radio frequency excitation signals, and a chipless RFID sensor printed on the surface of an object to be detected generates response signals related to the structure of the chipless RFID sensor after receiving the excitation signals; and after receiving the response signal, the main controller performs frequency characteristic analysis on the response signal, judges whether the frequency point of the response signal shifts or not, and controls the alarm module to work and sends an alarm signal if the offset reaches an early warning value. Compared with the prior art, the method has the advantages that cracks can be detected, and objects can be continuously detected. 一种裂缝的检测方法及装置，涉及位移检测技术，特别是裂缝检测技术，其特征在于在主控制器的控制下，RFID阅读器不断发出射频激励信号，印刷在待检测物件表面的无芯片RFID传感器