Ultrasonic phased array full-focusing imaging method for acoustic wave multi-path propagation compensation of layered composite material

By introducing Monte Carlo statistical multipath propagation modeling and equivalent time delay compensation mechanism into layered composite materials, the problem of inaccurate propagation time delay model was solved, and high-resolution and high signal-to-noise ratio ultrasonic phased array full-focusing imaging was realized.

CN121805415APending Publication Date: 2026-04-07CHINA JILIANG UNIV
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Patent Information

Application Number
CN202610157488.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing TFM imaging methods in layered composite materials suffer from inaccurate propagation time delay models, leading to main lobe expansion, side lobe enhancement, and structural noise amplification, making it difficult to achieve high resolution and high signal-to-noise ratio imaging.

Method used

A multipath propagation modeling and equivalent delay compensation mechanism based on Monte Carlo statistics is introduced. By randomly perturbing the beam direction and equivalent sound velocity, multiple equivalent propagation paths are generated, and weighted statistics are performed to obtain a more accurate propagation delay, which is used for delay correction and coherent superposition of full matrix echo data.

Benefits of technology

It significantly suppressed side lobes and spurious focusing, enhanced the focusing energy of real defect echoes, improved the spatial resolution and signal-to-noise ratio of imaging, and realized high-resolution, high-signal-noise-ratio ultrasonic phased array full-focusing imaging.

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Abstract

The invention relates to an ultrasonic phased array full-focusing imaging method for acoustic wave multi-path propagation compensation of a layered composite material, which is characterized by comprising the following steps of: arranging an ultrasonic phased array probe with N array elements on a composite material piece to be detected, obtaining complete echo data by taking each array element as a transmitting array element and taking all array elements as receiving array elements in sequence in a full-matrix acquisition mode; a two-dimensional pixel grid is established in an imaging area, a Monte-Carlo perturbation mechanism used for representing the acoustic wave propagation uncertainty in the layered composite material is introduced into a propagation model for each emission array element-receiving array element-pixel point combination, and the acoustic beam emission direction, the propagation path and the equivalent acoustic velocity are subjected to random perturbation, so that the acoustic wave propagation uncertainty in the layered composite material can be represented. Generating a plurality of equivalent sound wave propagation paths, calculating two-way propagation time of each path, and performing weighted statistics on energy contributions of different paths according to array element sound beam directivity to obtain equivalent propagation time delays of pixel points; and performing delay correction on a full-matrix echo signal by using the equivalent propagation time delay, and performing coherent superposition on signals of all transmitting-receiving array element combinations to realize dynamic focusing of a full-pixel grid, and finally reconstructing an ultrasonic full-focusing imaging image with high resolution and high signal-to-noise ratio. The time delay error caused by propagation path deviation and sound velocity non-uniformity in the layered composite material can be effectively compensated, the focusing precision and spatial resolution of full-focusing imaging are improved, meanwhile, an existing TFM imaging frame does not need to be changed, and the method has good engineering implementability and popularization and application value.
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