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

Abstract

The invention discloses a high-resolution defect nondestructive testing method based on combination of a Canny operator and ultrasonic plane wave imaging. The method comprises the following steps of: 1, transmitting a plane wave to a tested workpiece by utilizing ultrasonic coherence, and receiving echo data of random noise in a filtered signal; 2, performing full-focusing imaging on the echo data in the step 1 by using a DMAS algorithm; step 3, carrying out edge detection on an imaging picture obtained by full-focusing imaging in the step 2 by utilizing defects of a Canny operator; and 4, based on the defect edge detection in the step 3, carrying out fine scanning on the obtained defects in a point-by-point focusing mode. The method is used for solving the problems of low nondestructive detection speed and low detection precision of the defects of the detected workpiece, so that the quality control in industrial production is improved.

Description

technical field [0001] The invention belongs to defect non-destructive detection technology, and mainly relates to a high-resolution defect non-destructive detection method based on the combination of Canny operator and ultrasonic plane wave imaging. Background technique [0002] On the basis of not damaging the material properties, it is a very difficult problem to detect 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 because of its advanta...

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