Tb3Al2.5Ga2.5O12 Transparent Ceramic for Magneto‐Optical Application

The optical quality and microstructure of the Tb₃Al_2.5Ga_2.5O₁₂ transparent ceramic were investigated and compared with those of Tb₃Ga₅O₁₂ (TGG) and Tb₃Al₅O₁₂ (TAG). The transmission of the Tb₃Al_2.5Ga_2.5O₁₂ ceramic was as high as 80% in the visible and near‐infrared (IR) regions, which was close to the theoretical value. The Verdet constant of the Tb₃Al_2.5Ga_2.5O₁₂ ceramic measured at 632.8 nm and room temperature was ?150.6 rad/Tm, which was 12% larger than that of the TGG single crystal and 13% smaller than that of the TAG single crystal, and the Tb₃Al_2.5Ga_2.5O₁₂ ceramic showed the highest transparency among these three samples.     

Mathematical models for continuous electrospun nanofibers and electrospun nanoporous microspheres

A brief review of mathematical models of electrospinning is given. The nano‐effect and electrospinning dilation are presented to explain how to prepare extremely high strength continuous nanofibers and nanoporous microspheres, respectively. According to the established models, vibration‐electrospinning is introduced to improve electrospinability, Siro‐electrospinning is suggested to mimic the spinning procedure of a spider and magneto‐electrospinning is used to control the instability arising in the electrospinning process. A new theory linked to both classical mechanics and quantum mechanics should be developed to explain certain special phenomena in electrospinning. E‐infinity theory is considered to be a potential theory to deal with quantum‐like properties and nano‐effect on the nanoscale. The emphasis of this brief review is upon the authors' recent work, and the references are not exhaustive. Copyright © 2007 Society of Chemical Industry     

一种非接触型位移传感器的研究

介绍了一种基于磁场测量原理的非接触型直线位移传感器,该位移传感器采用强磁性金属膜磁敏电阻器作为敏感元件,通过测量磁场强度随位移的变化,实现物体位移的非接触测量。详细介绍了传感器的结构、测量原理,并进行了传感器的标定实验。该位移传感器具有结构简单、信噪比高、重复性好、精度高、可实现非接触测量,可广泛应用测量环境恶劣,且要求较高精度和可靠性的场合。     

井下液体流速检测仪的研制

介绍了一种井下低流速液体流速检测仪的研制 ,阐述了利用 2DCM硅磁敏二极管和波纹管制造井下液体低流速传感器的设计原理与结构 ,提出了用XTR10 4补偿电路和智能化检测系统的方案 ,实验结果表明 ,该项技术方案是可行的     

实用新型光纤磁场强度传感器

在高压电气系统中 ,磁场的检测是非常重要的。新型实用光纤磁场传感器应用了现代光通信系统中的新型磁光晶体、准直器、带尾纤的半导体激光器、耦合器等多项技术 ,使传感器不仅结构紧凑 ,而且具有良好的抗震性能和测量准确度     

无限长导电圆柱体的磁弹性振动

对处于均匀静磁场中表面承受周期性负载的无限长导电圆柱体进行了分析,给出了径向位移的解析表达式。以具体的算例,计算了几种不同负载频率下圆柱体的径向应力     

磁光盘载噪比测试方法的研究

通过深入研究载噪比测试过程,找出了测试中存在的特殊性,根据这种特殊性,提出了一种简单有效的数据采集方法,即单轴等时间采样法.     

采用单片机实现摩托车磁电机性能的测试

本文介绍了摩托车发动机磁电机的性能测试系统,并分析了该系统的硬、软件组成、工作原理和试验方法。     

小功率永磁同步发电机设计特点

在分析了小功率永磁同步发电机结构基础上阐述了该种电机的设计特点 ,并设计研制了样机 ,以此验证了设计方法的正确性     

基于磁阻芯片和MSP430单片机的电子罗盘设计

电子罗盘是一种获取载体姿态航向的设备。介绍磁电子罗盘的工作原理及其具体实现,利用Honeywell的HMC1022双轴磁阻传感器设计了一种小型化的电子罗盘,利用AD623高精密度放大器作信道调理电路,利用低功耗的MSP430微处理器完成A／D转换、方位角计算以及数字化输出等工作。采用置位／复位电路配合微处理器有效解决了传感器失调和漂移的影响。实验表明该系统具有良好的获取航向能力,且运行稳定,功耗低,误差小于1°。