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Received: 8 December 2020 Accepted: 12 February 2021 For ultrasonic phased array imaging, the most popular technique is the delay superposition algorithm of time domain signals with fixed weights. However, this technique and similar approaches cannot effectively suppress the non-scanning azimuth noise, which drags the imaging resolution. To overcome the problem, this paper proposes a nondestructive imaging method based on ultrasonic pulse integral signal, on the basis of ultrasonic phased array imaging. This method relies on the Green function to implement inverse Laplace transform on the ultrasonic pulse signal, obtains the analytical expression of the operator through mathematical derivations and calculations, and adopts the eigenvalues obtained by Laplacian matrix decomposition for image edge detection. The experimental results show that the operator is simple and effective, and better in imaging than other methods.

A Non-Destructive Imaging Method Based on Integral Signals of Ultrasonic Pulse