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The Residual Strain Measurement of Thin Conductive metal wire after Electrical Failure with SEM Moir

Acta Mechanica Solida Sinica 2016年第4期29卷 371-378页

作者： Yanjie Li Huimin Xie Qinghua Wang Mengmeng Zhou Manqiong Xu Qiang Luo Changzhi Gu AML Department of Engineering Mechanics Tsinghua University School of Civil Engineering and Architecture University of Jinan National Institute of Advanced Industrial Science and Technology Institute of Physics Chinese Academy of Sciences

In this study, the residual strain of a thin conductive metal wire on a polymer substrate after electrical failure is measured with SEM moir′e. Focused ion beam(FIB) milling is applied to fabricate micron moir′e gratings on the surfaces of constantan wires and the random phase shifting technique is used to process moir′e fringes. The virtual strain method is briefly introduced and used to calculate the real strain of specimens. In order to study the influence of a defect on the electrical failure of the constantan wire, experiments were conducted on two specimens, one with a crack, while the other one without any crack. By comparing the results, we found that the defect makes the critical beam current of electrical failure decrease. In addition, the specimens were subjected to compression after electrical failure, in agreement with the observed crack closure of the specimen. The successful results demonstrate that the moir′e method is effective to characterize the full-field deformation of constantan wires on the polymer membrane, and has a good potential for further application to the deformation measurement of thin films.

关键词： SEM moir′e residual strain metal wire focused ion beam(FIB)

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Study on response of metal wire in thermoacoustic imaging

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Journal of Innovative Optical Health Sciences 2022年第3期15卷 45-53页

作者： Zheng Liang Weipeng Wang Shuaiqi Qiao Lin Huang School of Electronic Science and Engineering(National Exemplary School of Microelectronics)University of Electronic Science and Technology of China Chengdu 611731 P.R.China Center for Information in Medicine University of Electronic and Technology of China Chengdu 611731 P.R.China

Thermoacoustic imaging(TAI)is an emerging high-resolution and high-contrast imaging *** recent years,metal wires have been used in TAI experiments to quantitatively evaluate the spatial resolution of different ***,there is still a lack of analysis of the response characteristics and principles of metal wires in *** theoretical and simulation analyses,this paper proposes that the response of metal(copper)wires during TAI is equivalent to the response of *** critically,the response of the copper wire is equivalent to the response of a half-wave dipole *** its length is close to half the wavelength of the incident electromagnetic wave,it obtains the best *** simulation,when the microwave excitation frequencies are 1.3 GHz,3.0 GHz,and 5.3 GHz,and the lengths of copper wires are separately set to 11 cm,5 cm,and 2.5 cm,the maximum SAR distribution and energy coupling effciency are *** result is connected with the best response of half-wave dipole antennas with lengths of 11 cm,4.77 cm,and 2.7 cm under the theoretical design,*** the further application,TAI can be used to conduct guided minimally invasive surgery on surgical instrument ***,this paper indicated that results can also guide the design of metal surgical instruments utilized in different microwave frequencies.

关键词： Thermoacoustic imaging simulation metal wire antenna

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A Novel Technology for Microwave Heated wire Drawing Process

A Novel Technology for Microwave Heated Wire Drawing Process

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先进纺织材料及加工技术国际学术会议

作者： Bo Keun Ha Jong Sung Kim You Huh Dept. of Mechanical Eng. Graduate School Kyung Hee University Laboratory of Intelligent Process and Control Kyung Hee University Faculty of Mechanical and Industrial System Engineering Kyung Hee University

Recent growth of modern industry requires multi-functional inorganic and micron-sized fibers. In this study, we suggested a novel method that could offer a high-efficient dieless drawing technology for manufacturing thin metal fibers based on the hot working principle. Microwave was used as the heat source. Experimental trials on a laboratory rig showed that the new system worked effectively and provided the feasibility in realizing the diameter attenuation up to 20 % diameter reduction. The theoretical model describing the wire deformation behavior in the working zone turned out to be in a good accordance to the experiment partly. Discrepancy in the hot zone near the exit could be attributed to the heat loss in the heat chamber. The coefficient of variation of the drawn wire diameter increased, as the draw ratio increased, which indicated that an ironing step would be needed to improve the evenness of the wire diameter.

关键词： Microwave Hot zone metal wire Dieless drawing Draw ratio Diameter reduction Coefficient of variation

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