一种利用光纤测量磁场参数的新方法

应用Ｓａｇｎａｃ效应和磁光效应相结合的方法,分析了光纤环中磁场引入的非互易相位差,得到了相干光强表达式;计算了以冕玻璃、重火石玻璃为磁场探头,在直流条件下的＾－ＩＤ－Ｂ、＾－ＩＤ－ΔψＢ、ΔψＢ－Ｂ计算曲线和交流条件下的Ｂ－ｗｔ、＾－Ｉｄ－ｗｔ计算曲线;并且讨论了使用相同方法测量磁光材料的Ｖｅｒｄｅｔ系数、旋光率等磁场参数以及电流的可能性。     

一种精确测量光学系统焦距的新方法

本文首次提出了一种利用低频全息光栅精确测量光学系统焦距的新方法,并分析了测量误差。这种方法适用于各种对称和非对称光学系统(如球面、二次非球面、柱面和轮胎面等)焦距的精密测量。     

A New Technique for Measuring FM & TV Antenna Systems

Described here is a measuring system using a computer controlled network analyzer that allows observation of FM and TV broadcast antenna systems. Impedance measurement may be made at any point in a broadcast antenna system where access is possible. Most notably, the VSWR characteristics of an antenna on a tower may be measured from the ground without the effects of the transmission line. Measurement accuracy is 0.1 DB and 0.5 degree return loss with excellent repeatability. The system is suitable for field use allowing evaluation of the antenna and other parts of the RF system.     

一种新的电磁场数据三维绘制算法

针对波束方程采样得到的电磁场数据,提出了一种新的三维绘制算法。算法首先利用波束方程按角度值对电磁场表面采样得到点云数据,然后通过对点云数据进行归一化处理、极坐标转换为三维立体坐标、为点云数据的属性值映射包含颜色和透明度的特征值的可视化映射方法,以及利用三角形带进行波束表面绘制等过程将电磁场数据显示出来。实现的算法已经用于武器装备的电磁兼容综合测试与分析系统,取得了很好的可视化效果,绘制效率高,并在最后给出了实验结果。     

用场量迭代法分析三维介质目标的电磁散射

本文用场量迭代方法对三维电场积分方程进行数值求解,得到了给定电磁波照射下介质体内的场分布,并由此求得介质体外的散射场.从本文给出的几个算例看出,得到的解能较快收敛,并且避免了矩阵求逆运算,具有运算简便与速度快等优点。本文给出的薄板形介质的计算结果与现有文献的实验结果和计算结果进行了比较.证实了本文方法的正确性。     

一种使用平面线圈结构的微型电磁继电器

本文介绍一种采用平面线圈结构的微型电磁继电器的制造工艺和理论分析。这种继电器的大小大约是 4mm× 4mm× 0 .5mm ,工艺比较简单 ,主要采用光刻、蒸镀、电镀和腐蚀牺牲层等普通的微加工技术来完成全部制作工艺。因此可以大大地降低继电器的生产成本、物理尺寸和制造的复杂性。另外 ,还进行了一些有关线圈通过激励电流后对活动电极产生电磁力的理论计算和仿真 ,利用这些结果可以对这种电磁继电器的结构和参数进行优化设计     

圆锥波导中电磁场的一种新的等效表达式

本文提出了一种新的等效圆波导半径表达式,改进了计算圆锥波导内电磁场的传播常数,波阻抗和场分量的计算精度,运用数值对比方法,证明新的表达式在高次模和近截止区仍有较好的适用性,最后结合实例讨论了相关的插值方法,以便处理工程设计中常邮的特征值非整数时的计算问题。     

A New Technique for Measuring Gate-Oxide Leakage in Charging Protected MOSFETs

While accurate measurement of gate-oxide leakage in isolated CMOS oxides can be straightforward, it is not the case for CMOS oxides connected to a plasma-charging protection device. In this paper, a method enabling accurate gate-oxide leakage extraction from CMOS transistors directly connected to a gated MOSFET-based charging protection device is described. The method extracts gate-oxide leakage at the bottom side of the gate-oxide from the drain/source terminal of the protected MOSFETs biased into inversion while diverting the parasitic leakages from the protection device into a P⁺ tap sink. The location and design of the P⁺ tap sink play an important role on the success of the method. The method demonstrates a high measurement accuracy over the conventional method with a nearly 99% absorption efficiency of the protection-device-induced leakage by the P ⁺ tap sink, with the test structures used in this study. The method enables a saving of up to 30% of the layout space in the design of the charging test structures in test chips by eliminating usage of the fuse between the protected and protecting devices. A correlation study performed with the data measured by the new method and the conventional method suggests that both protected and protecting transistors can experience gate-oxide damage at the same time during back-end integrated circuit (IC) manufacturing process if the protected transistors violate the gate-charging design rules. It also indicates that the protected transistors have higher chance to receive more severe damage than the protecting transistors due to different oxide damage mechanisms associated with the terminal connectivity of these transistors     

强电磁场中的温度测量技术的研究

文章概述了在强电磁场中用红外辐射光纤传感器测量温度的原理和实验装置。     

用时域积分方程法计算介质目标的电磁散射

本文应用时域积分方程法计算介质目标的散射场，并以球体和带球帽的圆柱体为例给出了沿轴向入射平面波的电磁散射结果，与实际测试结果非常一致，值得指出的是，虽然本文给出的介质目标具有平面对称性，但该方法适用于任意形状的目标。     

单片微波集成电路的快速电磁仿真技术

本文概述了单片微波集成电路(MMIC)电磁仿真的基本原理,提出了电路特性参量的直接摘取法,研究了两项矩阵降阶技术,从而建立了一套省时、实用的MMIC快速电磁仿真技术。两个仿真实例证明了该技术的有效性,仿真速度约可提高一个数量级。     

Electromagnetic Field Immunity?A New Parameter in Receiver Design

Parameters describing the susceptibility of a receiving installation to interfering electromagnetic fields are discussed, and appropriate measuring methods are devised. As a result of an extensive analysis of the complex system of transmitters, interference sources and radio receivers in the range of 0.15-1000 MHz, susceptibility limits are proposed, and their values are compared with measurements on production-type receivers.     

一种用线阵CCD测量物体表面三维轮廓的新方法

提出了一种用线阵CCD对物体三维轮廓进行测量的新方法,通过矩形光栅离焦投影,产生正弦光场,利用线阵CCD对物体进行扫描采样,采用三步相移技术进行相位解调,对物体三维轮廓进行测量,重点分析讨论了用线阵CCD对物体三维轮廓进行测量的原理和特性,并给出了试验简图及实际测量结果。     

一种新的激光衍射粒度测试技术的研究

介绍了一种基于衍射的粒度测试新技术，其反演方法采用Shifrin变换，接受器件采用线性CCD。理论分析和对样品测试表明：该法仅需要很少的预知信息；可测得的直方图分布形式为详细的粒径连续分布；峰值粒径测量精度提高，其相对误差在3％左右。     

Excitation of an External Terminated Longitudinal Conductor on a Rocket by a Transverse Electromagnetic Field

A single conductor of arbitrary length is placed close to the surface of a conducting cylinder parallel to its axis. Impedances are connected between the ends of the cable and the cylinder. An incident monochromatic plane electromagnetic wave propagates in the longitudinal direction and is thus polarized in a transverse plane with respect to the axes of the external conductor and the cylinder. The component of the electric field tangent to the terminating impedance excites the circuit. The objective is to derive formulas for the currents in these impedances. The transverse dimensions of the conductor satisfy the inequalities a1 ? a2 ? ?, where a1 is the radius of the external conductor and a2 is the radius of the cylinder. It is assumed that the distance d between adjacent points on the conductor and the rocket is small compared with the wavelength.     

电磁场与电磁波课程教学案例设计实例

案例教学法是一种启发学生思考,培养学生探究能力,激发学生求知欲和学习兴趣的有效方法。本文以“电磁场与电磁波”课程中的同轴线性能分析为例,给出引导学生研究分析同轴线特性的方法。在分析单位长电容、单位长电感、特性阻抗和传输功率性能参数基础上,启发学生结合实际应用需求,从耐压、传输功率和传播损失三个不同角度分析同轴线的特性,并通过数值模拟的方法,给出直观的结果。教学实践表明,该方法教学效果良好。     

Frequency Response of Multiconductor Transmission Lines Illuminated by an Electromagnetic Field

A well-known result [1], [2] for the response of a two-wire transmission line illuminated by a nonuniform electromagnetic field is extended to multiconductor lines. A simple matrix equation for the currents induced in arbitrary termination networks is obtained. Air Development Center.     

The Problem of Electromagnetic Field Diffraction by an Axisymmetric Inhomogeneous Body

An approximate method is proposed for the solution of the vector problem of diffraction by a body of revolution. The material characteristics of the body are independent of the angular coordinate in the cylinder coordinate frame. The method is tested using the problem of diffraction of a plane wave by a sphere and a circular cylinder having finite dimensions. The rigorous approach based on a spline basis is used in the case of a dielectric sphere whose wavenumber depends only on the radial coordinate (in spherical coordinates). The two methods are compared for the case of the parabolic dependence of the squared wavenumber of an inhomogeneous sphere on the radial coordinate. The diffraction of a point source field by a metamaterial inhomogeneous sphere is considered.