Ultrasonic C scanning imaging method based on two-dimensional neighborhood synthetic aperture focusing

Abstract

The invention discloses an ultrasonic C scanning imaging method based on two-dimensional neighborhood synthetic aperture focusing, which includes five steps including performing visualization for an acoustic beam spread angle of a probe, building a mathematical model for a neighborhood of a focusing treatment point, collecting ultrasonic A wave signals, synthesizing focusing treatment ultrasonic A wave signals and performing ultrasonic C scanning imaging for a defect. The technical effect of the invention lies in that through focusing the two-dimensional neighborhood taking an objective pointas a center and simultaneously taking the wafer diameter, the near field length and the acoustic beam spread angle of the probe into consideration, the neighborhood of the synthetic aperture focusingtreatment point is confirmed, so that the scanning result is more accurate as compared with that of the conventional SAFT (synthetic aperture focusing technique) method, the adverse effects of the acoustic beam spread angle on the ultrasonic nondestructive detection can be effectively restrained, and the accuracy of the ultrasonic C scanning imaging is improved.

Description

technical field [0001] The invention relates to an ultrasonic nondestructive testing imaging method, in particular to an ultrasonic C-scan imaging method based on two-dimensional neighborhood synthetic aperture focusing. Background technique [0002] Ultrasonic testing can judge its internal defects without damaging the performance and shape of components. It is an important means to ensure product quality and performance and stabilize production processes in many fields of modern industry. The A wave signal is collected during the ultrasonic testing process. Raw data plays an important role in ultrasonic automatic detection: it is not only the basis for ultrasonic C-scan imaging, but also the basis for subsequent analysis and processing of scan results. It can be seen that obtaining accurate A-wave signals is the guarantee for accurate detection of defects. [0003] However, when the ultrasonic probe emits sound waves, it has a certain sound beam spread angle. When the pro...

AI Technical Summary

Problems solved by technology

The existing related SAFT algorithm applied in the field of ultrasound also has the following shortcomings: ①The processing points involved in focusing are limited to the one-dimensional neighborhood of the target point, which essentially belongs to the 1D-SAFT algorithm

like figure 1 Shown: With the target point as the center, the distribution of processing points is only considered on a line segment. This algorithm only suppresses the scattering effect of the diffusion angle in a certain direction, and it is difficult to achieve the ideal focusing effect

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