Damage focusing imaging method for composite materials using multipe array of ultrasonic guided wave frequency-phased joint control excitation

Aiming at the shortcomings of the ultrasonic guided wave phased array method, this paper proposed a damage focusing imaging method for composite materials using multiple array of ultrasonic guided wave frequency-phased joint control excitation. Compared with the standard ultrasonic guided wave phased array technology, this method realized angle-distance focused scanning and damage locationon composite material plates by setting different excitation frequencies on each array element. Firstly, the signal model of multi-array ultrasonic guided wave frequency and phase joint control excitation focusing was established; Secondly, a distributed multiple-input multiple-output (MIMO) linear array was designed to focus and scan the monitoring area point by point, and the array ultrasonic guided wave damage echo reception was established, and the multiple signal classification (MUSIC) method was used to realize composite material Imaging of damage. The simulation and experimental results of glass fiber plate showed that the method had good focusing performance, high damage imaging and positioning accuracy for composite materials.