Composite material structure damage monitoring method and system based on laser piezoelectric technology

The invention provides a composite material structure damage monitoring method based on a laser piezoelectric technology. The method comprises the following steps that signals formed when a laser head globally scans all scanning points on a composite material plate each time are received; the signals received each time are processed, the direct wave time delay from each array element to each scanning point is obtained, calculation is carried out in a preset steering vector formula by combining the direct wave time delay from the same scanning point to each array element, and a steering vector array of each scanning point is obtained; steering vectors in the steering vector array of each scanning point are represented in a real part unit, so that the steering vector array of each scanning point is a corresponding column of vectors, the Euclidean distance between the columns of vectors is calculated, and an area between two scanning points with the minimum Euclidean distance calculation value is obtained; and f