光纤和自聚焦透镜的端面检查

本文描述了自聚焦透镜的一种检查方法，用来测定光纤和自聚焦透镜的端面质量，同时可测定光纤的数值孔径（NA）。该方法简单易于操作，适用于设备较小的条件下使用。     

改进的斑点法测量自聚焦透镜光学参数

改进的斑点法测量自聚焦透镜的主要参数是利用直径不同的近轴平行光束垂直入射到自聚焦透镜端面，在出射端面测量光束光斑大小之差，从而确定了自聚焦透镜的周期长度ｐ，焦距ｆ以及中心折射率ｎ０和分布常数Ａ。     

光栅调谐外腔半导体激光器腔参量对其双稳动态特性的影响

本文通过对半导体激光器（LD）速率方程的数值求解，分析了外腔半导体激光器（ECLD）腔参量（谱线展宽因子α，LD面向外腔的端面反射率R等）对于双稳环跳变的动态特性的影响。     

用四焦点全息透镜实现的PS和FPS互连网络

提出了一种用四焦点全息透镜实现的二维ＰＳ（ＰｅｒｆｅｃｔＳｈｕｆｆｌｅ）和ＦＰＳ（ＦｏｌｄｅｄＰＳ）的方法，并给出了四焦点全息透镜的设计方法及应用于二维ＰＳ和ＦＰＳ互连网络中的实验结果。     

凹形端面填高折射率树脂的透镜型塑料光纤

报导一种光耦合方案，它采用光纤端面透镜实现塑料光纤与光源和检测器之间的高效耦合。填入光纤凹形端面的透明树脂造表面张力形成双凸透镜，并相对于纤芯自动定位。简单的光线矩阵分析表明，与光纤平面端面相比，透镜形端面耦合角度，允许大范围的工作距离。已成功演示这种透镜端面光纤在输入和输出的实验检测。     

改进的斑点法测量自聚焦透镜光学参数

改进的斑点法测量自聚焦透镜的主要参数是利用直径不同的近轴平行光束垂直入射到自聚焦透镜端面，在出射端面测量光束光斑大小之差，从而确定了自聚焦透镜的周期长度ｐ，焦距ｆ以及中心折射率ｎｏ和分布常数Ａ。本文报导了改进的斑点法测量原理及测量方法，并对测试结果作了比较。     

应用CCD的透镜曲率自动测量系统

本文介绍了一种以线阵ＣＣＤ固态图像传感器取代读数显微镜，能自动测量和实时显示结果的透镜曲率测量系统，论述了系统的工作原理，软件和硬件的设计及装置的测量误差。     

自聚焦透镜与倍频晶体构成的激光谐振腔

根据自聚焦透镜折射率的分布特性，对其成像原理进行了讨论。将用来耦合泵浦光的自矛焦透镜的一个端面加工成凹面并镀高反介质膜，与倍频晶体出射端面构成平-凹型全固态倍频激光谐振腔。这种激光器谐振腔结构简单、体积小、易于谐振、输出倍频激光效率高并且功率稳定。     

斜端面聚焦纤维透镜传输特性的理论分析

在光隔离器等重要光学器件中，聚焦纤维透镜用作准直器。本文详细分析了在光纤与透镜连接处采用斜端面与采用垂直端面时准直器性能的变化。讨论结果与实验结果相符     

第四代光存储技术——近场光存储

固体浸没透镜（SIL：Solid Immersion Lens）近场光存储能够突破传统光学衍射极限的限制，是很有发展潜力的第四代光存储技术。日本Sony公司在近场光存储领域一直位于领先地位，已成功研发了采用双轴力矩器装卡SIL的近场光盘系统，可以达到存储容量为112GB（80．6Gb／in^2）、数据传输率为72Mbps，以及存储容量为m2GB（80．6Ch/in^2）、数据传输率为108Mbps的记录结果。     

一种芯片内部稳压电源的实现

介绍和分析了一种用于PWM控制器内部的稳压电路,采用双极线路结构和4μm工艺。经过PSPICE仿真,它具有0．176mV／V的稳压系数和60dB的纹波抑制比和较低温度系数。     

Analysis of a strip in a waveguide

An analysis and an experimental study of a strip in a transverse plane of a rectangular waveguide below cutoff are presented. This work is a preliminary step in analyzing a stripline-fed slot antenna array in which each stripline feed is enclosed in a rectangular waveguide below cutoff. A numerical method is developed to solve a “pseudo” mixed-potential integral equation for the current on the strip excited by a delta-gap source at some point along the strip. The Green's function for dipole sources in the rectangular waveguide is used in the spectral and spatial representations and Shanks' transform is employed to speed up the convergence of the doubly infinite series. Numerical and experimental results are presented for a monopole fed at one wall of a rectangular waveguide and for a bottom-fed and bottom-loaded strip in a rectangular waveguide     

对高速比较器中复位场效应管的研究

A high-speed comparator design based on regeneration architecture, which can be used in a flash ADC, is presented.A threshold-limit-speed effect（TLSE） which limits the speed of the comparator was discovered and studied in detail.The size of the reset-MOSFET was optimized to resolve the TLSE and make the comparator work at the maximal speed.The results were confirmed by simulation and the corresponding circuit was realized in a flash ADC design in SMIC 0.18-μm CMOS technology.The test result shows that the comparator can work well at 2 GHz and can even work up to 2.8 GHz while the power dissipation is 3.2 mW.     

Effect of a reset-MOSFET in a high-speed comparator

t the comparator can work well at 2 GHz and can even work up to 2.8 GHz while the power dissipation is 3.2 mW.     

有源RLC电路的量子化

本文提出了RLC电路的一种量子化方案，研究了电路中电荷和电流在几种量子态中的量子涨落。通过变量替换，这种量子化方案也适用于受迫阻尼谐振子。     

Analysis of a coaxial-to-waveguide adaptor including a discendedprobe and a tuning post

A field matching analysis of a coaxial-to-waveguide adaptor incorporating a disc-ended probe and a tuning post is presented. In this analysis, the tuning post is considered as a short-circuited second probe. A computer algorithm for calculating the input impedance of this structure is developed. This algorithm is used to investigate and improve the operation of a commercially available coaxial-to-waveguide adaptor     

Transmission-Line Properties of a Strip on a Dielectric Sheet on a Plane

The subject is a strip Iine formed of a strip and a parallel ground plane separated by a dielectric sheet (commonly termed "microstrip"). Building on the author's earlier papers all the significant properties are formulated in explicit form for practical applications. This may mean synthesis and/or analysis. Each formula is a close approximation for all shape ratios, obtained by a gradual transition between theoretical forms for the extremes of narrow and wide strips. The effect of thickness is formulated to a second-order approximation. Then the result is subjected to numerical differentiation for simple evaluation of the magnetic-loss power factor from the skin depth. The transition formulas are tested against derived formulas for overlapping narrow and wide ranges of shape. Some of these formulas are restated from the earlier derivations and others are derived herein. The latter include the second-order approximation for a narrow thin strip, and a close approximation for a narrow or wide square cross section in comparison with a circular cross section. Graphs are given for practical purposes, showing the wave resistance and magnetic loss for a wide range of shape and dielectric. For numerical reading, the formulas are suited for programming on a digital pocket calculator.     

基于智能手机压电基片上微液滴位置分析章

为了降低微流分析成本,该文提出了基于智能手机检测压电基片上目标微液滴方法,并开发出相应的应用软件,通过分析微液滴颜色信息和几何信息定位目标微液滴位置,结合分析时间获取微液滴输运速度。为验证提出方法的正确性,以5 μL黑色墨水溶液微液滴为研究对象,进行压电基片上微液滴识别和位置分析实验。结果表明,该文所提方法和开发的应用软件可识别和定位压电基片上微液滴,在功率为27.5 dBm时,第2~10 s段内微液滴输运速度为0.416 mm/s。     

Design of a mechanism for biaxial rotation of a wing for a hovering vehicle

This paper presents a novel mechanism to actuate the wings of a hovering micro air vehicle (MAV). The mechanism uses a single actuator, but each wing can rotate about two orthogonal axes. The goal of this work is to design a light-weight compact mechanism that flaps the wings, inspired from the wing motion of hummingbird and hovering insects, to generate enough lift for the vehicle to hover. This paper explains in detail the proposed mechanism and its working prototypes. Also, the paper presents a dynamic simulation of the mechanism. The proposed dynamic simulation is used to predict the theoretical lift of the ornithopter. Further, the theoretical model is supported by actual experimental data collected from the prototype. The experimental data shows that the vehicle has the potential to develop enough lift to hover.