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基于磁梯度张量的金属磁记忆检测方法 被引量:29
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作者 陈海龙 王长龙 朱红运 《仪器仪表学报》 EI CAS CSCD 北大核心 2016年第3期602-609,共8页
金属磁记忆是对铁磁材料早期微观损伤及应力集中进行无损检测的有效方法。为提高磁记忆检测的可靠性,充分利用磁记忆信号的矢量信息,将磁梯度张量测量及分析方法引入磁记忆检测中。根据张量缩并分析理论得到了磁记忆信号的磁梯度张量模... 金属磁记忆是对铁磁材料早期微观损伤及应力集中进行无损检测的有效方法。为提高磁记忆检测的可靠性,充分利用磁记忆信号的矢量信息,将磁梯度张量测量及分析方法引入磁记忆检测中。根据张量缩并分析理论得到了磁记忆信号的磁梯度张量模量,通过求解梯度局部相位的一阶导数得到信号的梯度局部波数,然后分析信号的磁梯度张量模量和梯度局部波数分布特征,得到磁梯度模量和梯度局部波数极值点分别与应力集中边界和中心位置的对应关系。实验结果表明:磁梯度张量方法能够克服检测方向与缺陷夹角变化对测量信号的影响,准确地对应力集中进行判断。 展开更多
关键词 金属磁记忆 应力集中 磁梯度张量 张量模量 局部波数
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Infrared small target detection algorithm via partial sum of the tensor nuclear norm and direction residual weighting
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作者 SUN Bin XIA Xing-Ling +1 位作者 FU Rong-Guo SHI Liang 《红外与毫米波学报》 北大核心 2025年第2期277-288,共12页
Aiming at the problem that infrared small target detection faces low contrast between the background and the target and insufficient noise suppression ability under the complex cloud background,an infrared small targe... Aiming at the problem that infrared small target detection faces low contrast between the background and the target and insufficient noise suppression ability under the complex cloud background,an infrared small target detection method based on the tensor nuclear norm and direction residual weighting was proposed.Based on converting the infrared image into an infrared patch tensor model,from the perspective of the low-rank nature of the background tensor,and taking advantage of the difference in contrast between the background and the target in different directions,we designed a double-neighborhood local contrast based on direction residual weighting method(DNLCDRW)combined with the partial sum of tensor nuclear norm(PSTNN)to achieve effective background suppression and recovery of infrared small targets.Experiments show that the algorithm is effective in suppressing the background and improving the detection ability of the target. 展开更多
关键词 infrared small target detection infrared patch tensor model partial sum of the tensor nuclear norm direction residual weighting
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