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| 1 | Fabrication technique of micro/nano-scale speckle patterns with focused ion beam显示文摘The fabrication technique of micro/nano-scale speckle patterns with focused ion beam (FIB) system is studied for digital image correlation (DIC) measurement under a scanning electron microscope (SEM).The speckle patterns are fabricated by directly etching the counterpart of the specimen to the black part of a template.Mean intensity gradient is used to evaluate the quality of these SEM images of speckle patterns fabricated based on different templates to select an optimum template.The pattern size depending on the displacement measurement sensitivity is adjusted by altering the magnification of FIB according to the relation curve of the etching size versus magnification.The influencing factors including etching time and ion beam current are discussed.Rigid body translation tests and rotation tests are carried out under SEM to verify the reliability of the fabricated speckle patterns.The calculated values are in good agreement with the imposed ones. | LI YanJie XIE HuiMin LUO Qiang GU ChangZhi HU ZhenXing CHEN PengWan ZHANG QingMing | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 7 |
| 2 | A novel flexure-based uniaxial force sensor with large range and high resolution显示文摘High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions. | CHEN WeiHai JIANG Jun CHEN WenJie LIU JingMeng | 2013 | Science China(Technological Sciences)2013，56，8： | 1 |
| 3 | 一种交变载荷下Galfenol力传感器结构与能量效率的优化策略显示文摘提出了一种新的面向交变载荷的力传感器测量结构,以Galfenol合金为敏感元件,将合金的两端加工成与锁紧结构配合的接口,可以对Galfenol棒进行挤压或者拉伸,通过检测材料磁化率变化引起的感应电动势可以确定外加交变负载的大小与方向。在传感器工作机理的基础上,提出了一种传感器能量利用效率优化策略,采用封闭结构对Galfenol合金力传感器磁路进行了设计与优化,分别采用二维和三维有限元方法,研究了开放式磁路结构和提出的新型结构在磁路分布以及能量利用效率上的特征。仿真和实验结果表明,所提出的新型传感器结构,不仅在结构上可以增强Galfenol合金中磁通密度分布的均匀性,同时可以大幅提升传感器的能量利用效率,其提升率超过50%,同时对所设计的传感器结构进行加载交变载荷试验,试验结果验证了传感器设计方案的可行性。 | 舒亮 吴桂初 陈定方 | 2014 | 中国机械工程2014，25，23： | 1 |
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