The invention discloses an omnidirectional A0
modal Lamb wave electromagnetic
acoustic sensor, and belongs to the field of ultrasonic non-
destructive testing. A double-layer spiral inflection
coil structure is integrated in a flexible circuit board, and the omnidirectional A0
modal Lamb wave electromagnetic
acoustic sensor is designed and developed to excite single A0
modal Lamb waves in an aluminum plate. The developed electromagnetic
acoustic sensor is verified by experiments, the single A0 modal
Lamb waves can be excited in the aluminum plate, defects in the aluminum plate are detected by the sensor, and positioning precision is high. The developed electromagnetic acoustic sensor has fine
frequency response characteristics according to
verification by scanning frequency experiments, and the developed electromagnetic acoustic sensor has fine omnidirectional characteristics according to
verification by omnidirectional characteristic testing experiments. By the aid of the developed omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor and an array combination
imaging algorithm thereof, wide-range and high-efficiency defect imaging of a plate structure can be realized, and the sensor has great application values and potentials in the field of health monitoring and non-destructive evaluation for the plate structure.