High real-time quantitative ultrasonic detection method based on multi-angle stereo matching

Abstract

The invention discloses a high-real-time quantitative ultrasonic detection method based on multi-angle stereo matching. Aiming at a serious restriction bottleneck between the fine quantitative representation capacity and detection instantaneity of defects of existing ultrasonic detection devices, a basic idea of a finite element is firstly introduced to rasterize a to-be-detected test piece, a plurality of ultrasonic transducers distributed in different directions of a space are utilized for sequentially irradiating grid cells, and a shifting relation between the fine quantitative representation capacity of the flexible coordinating defects and the detection instantaneity is realized by utilizing the wavelet-transform-based multi-resolution stereo matching correlation based on the acquisition of multichannel ultrasonic reflection echo signals. By collecting the multi-angle ultrasonic reflection echo signals, the high-real-time quantitative ultrasonic detection method has the advantage of complete carried information amount and is more beneficial to realization of the quantitative detection; by utilizing a basic theory of wavelet transform, the method has multi-resolution and time-frequency domain conjoint analysis capacities and is particularly suitable for time frequency signals such as ultrasonic waves and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial ultrasonic detection, and relates to a high real-time quantitative ultrasonic detection method based on multi-angle stereo matching. Background technique [0002] As an economical raw material for finished products, pipeline materials are widely used in industries closely related to human production and life, such as shipbuilding, biomedicine, automobiles, petrochemicals, civil engineering, and municipal water and gas supply systems. However, with the increase of service life, factors such as corrosion and fatigue increase the possibility of pipeline leakage or even explosion. Therefore, it is very necessary to use ultrasonic nondestructive testing technology to carry out factory inspection of pipes and monitoring of in-service equipment to reduce the loss of human life and property caused by accidents. [0003] Ultrasonic nondestructive testing is an ancient subject, which has developed from ...

AI Technical Summary

Problems solved by technology

These deficiencies are mainly manifested in the following aspects: First, due to the number, location and scanning method of ultrasonic transducers, it is determined that the ultrasonic transducers can only receive echo signals from a single direction, and the above imaging results are only for Characterization of a certain section; if the defect has a certain volume, the information on the side and bottom of the defect is not complete, and the overall quantification of the defect is low

Second, volumetric defects can be accurately characterized by using ultrasonic scanning tomography, such as the patent "Ultrasonic superficial tissue and organ volume scanning tomography method" (patent application number is CN201210197253.3); but ultrasonic tomography is based on It is superimposed on the basis of multiple B (or C) scans, which is bound to be time-consuming and requires more storage hardware

It can be seen that the quantitative and fine characterization of defects is a process of extracting rich feature information based on a large number of echo signals; the process of collecting, processing and analyzing a large amount of data will inevitably consume a lot of time and lose the real-time detection

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