Parametric array sound wave and laser speckle detection system and method

The invention discloses a parametric array sound wave and laser speckle detection system and a method thereof. The device comprises a laser light source used for forming light spots on a measured object, wherein the control host is used for outputting swept-frequency signals, the parametric array module is used for converting the swept-frequency signals into ultrasonic modulation signals, transmitting the ultrasonic modulation signals into air, restoring the ultrasonic modulation signals to produce sounds and then resonating with a measured object, the camera is used for shooting light spot images on the measured object, and the control host is connected with the parametric array module and the camera. According to the invention, non-contact nondestructive detection can be carried out on most objects (unlimited types and surfaces), and objects, damages and the like below the surfaces of the objects can be detected; the system has the advantages of being simple, high in accuracy, high in detection efficiency,