High-resolution defect nondestructive testing method based on combination of ultrasonic plane wave imaging and time reversal operator

Abstract

The invention relates to a high-resolution defect nondestructive testing method based on combination of ultrasonic plane wave imaging and a time reversal operator. The method comprises the steps: transmitting a group of plane waves to a measured workpiece through an ultrasonic linear phased array, acquiring reflection echo data of each plane wave by using the ultrasonic phased array, and carrying out time domain filtering on the echo data to filter random noise in a signal; extracting the edge information of each defect in an scanned image through an edge extraction method and serving as basic information of the internal defect of the measured workpiece, wherein the basic information comprises position information, shape information and size range information of the defect; and carrying out automatic focusing on defect signals by using the feature vector of the time reversal operator, carrying out accurate imaging on each obtained defect area, and carrying out accurate positioning on the defects of the whole measured workpiece.

Description

technical field [0001] The invention relates to the technical field of defect non-destructive detection, and relates to a high-resolution defect non-destructive detection method based on the combination of ultrasonic plane wave imaging and time reversal operator. Background technique [0002] On the basis of not damaging the material properties, it is a very difficult problem to detect and image tiny defects in materials with complex geometric shapes. Especially for nondestructive testing of metal materials, it is an extremely important quality control technology. Taking GH4169 alloy as an example, it is widely used in key components such as aero-engine turbine disks, compressor drums, casings, etc. Even if these key components exist Both microscopic flaws and fatigue damage can lead to catastrophic consequences, so high-precision non-destructive testing is essential. Ultrasonic testing is one of the most widely used testing methods among all non-destructive testing methods...

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problems of slow non-destructive detection speed and low detection accuracy of the defects of the tested workpiece, thereby improving the quality control technology in industrial production. The invention provides a high-resolution defect based on the combination of ultrasonic plane wave imaging and time reversal operator Non-destructive testing method, the present invention provides the following technical solutions:

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