High-real-time quantitative ultrasonic detection method based on multi-angle stereo matching
A technology of stereo matching and ultrasonic testing, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems of loss of real-time detection, time-consuming, and low degree of defect quantification, and achieve significant real-time detection capabilities and complete portability Effect
A technology of stereo matching and ultrasonic testing, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems of loss of real-time detection, time-consuming, and low degree of defect quantification, and achieve significant real-time detection capabilities and complete portability Effect
CN103575808AActive Publication Date: 2014-02-12ZHEJIANG UNIV
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[0030] The present invention will be further described below in conjunction with accompanying drawing.
[0031] Such as figure 1As shown, the general process of the high-real-time quantitative ultrasonic testing method based on multi-angle stereo matching includes: S1 indicates that the test piece is divided into adjustable grid units, which are used as the basic unit for defect reconstruction and material characterization; Arrange two or more ultrasonic transducers in different orientations, adjust the attitude of the ultrasonic transducers, so that the sound beams of each ultrasonic transducer only converge in the grid unit space, and each beam of sound waves is transmitted from the ultrasonic transducer The sound path experienced by the transducer surface converging to the grid unit is the same; S2 indicates that each ultrasonic transducer is excited, and the sound waves emitted by them will form a sound field with the highest energy at the corresponding grid unit; S3 indic...
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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 ...
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Patent Timeline
12 Feb 2014
Publication
CN103575808A
- IPC
- G01N29/04
- Inventors
- 吴施伟; 武二永