Foaming uniformity detection imaging device and method for polyurethane metal sandwich panel

The invention relates to an imaging device and method for foaming uniformity detection of a polyurethane metal sandwich panel, an ultrasonic guided wave excitation probe is connected to an ultrasonic excitation device, the excitation device applies a cosine function and Hanning window excitation signal to the guided wave excitation probe, and ultrasonic guided waves generated by the guided wave excitation probe are propagated along a polyurethane metal outer layer panel. The guided wave receiving probe is connected to the ultrasonic receiving device, the ultrasonic guided wave excitation and receiving probe is installed through the mechanical connecting device and keeps a fixed distance, the ultrasonic guided wave receiving probe is used for collecting reflected ultrasonic signal characteristics, and the foaming density is analyzed according to the sound velocity and acoustic impedance of a material. According to the method, a foaming density condition of a whole board is scanned to obtain a foaming uniformit