摘要：The multi-mode total focusing method (MTFM) enables a region of interest within a specimen to be imaged using different combinations of beam paths and wave-mode. For a crack, the diffraction response of the tip may be evident in certain modes and the specular reflection in others. Accurate characterisation of defects requires combining information from multiple modes. For MTFM images, not all modes have a high signal-to-noise ratio (SNR). In this work, multi-mode phase coherence imaging (MPCI) was proposed by combining MTFM and phase coherence imaging (PCI) method. The better data fusion is mainly the result of the selective use of information from the most appropriate mode(s) and fusion reduces the probability of misjudging defects. In this paper, full matrix data was acquired for aluminium alloy blocks containing notch defects at different angles and imaged using the both multi-mode methods. The signal-to-noise ratio results of the two multimodal methods show that MPCI is better than MTFM for multi-angle defect detection. In addition, the Sobol sensitivity analysis method was used to construct the signal-to-noise ratio sensitivity parameter for quantifying the imaging effect of each mode on defects at different angles, and the results can effectively guide the optimisation of the multi-mode fusion algorithm.

关键字：Multi-mode total focusing imaging; phase coherence imaging; aluminium alloy

ISSN号：1058-9759

卷、期、页：网络发表

影响因子：0.000000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：NONDESTRUCTIVE TESTING AND EVALUATION

参与作者：陈哲,卜阳光,程经纬

通讯作者：王禹钦

第一作者：董绍华

论文类型：期刊论文

论文概要：王禹钦,董绍华,陈哲,卜阳光,程经纬，Phase coherence weighted multi-mode total focusing method imaging of multi-angle defects，NONDESTRUCTIVE TESTING AND EVALUATION，，网络发表

论文题目：Phase coherence weighted multi-mode total focusing method imaging of multi-angle defects