用计算全息制作啁啾光纤光栅的研究

提出了一种制作啁啾光纤光栅的新方法－－计算全息法，对该方法进行了理论分析，描述了制作过程和实验装置，给出了一个用计算全息制作的啁啾参数的为F＝32π，长度为21.6μm的样品，得到了该样品在光学系统中的再现像。     

真空微电子三级管直流特性及栅阴极电容的计算机模拟

本利用有限差分方法计算了真空微电子三极管中的电势与电场分布，研究了尖端顶部的电场受尖端曲率半径及栅圆坏直径的影响情况，并模拟计算了该管的静态输出特性。另外通过改变尖锥及栅圆环的参数，详细研究了栅阴电容的变化情况，该模拟结果与已报道的实验结果符合较好。     

真空微电子三极管直流特性及栅阴极电容的计算机模拟

本文利用有限差分方法计算了真空微电子三极管中的电势与电场分布，研究了尖端顶部的电场受尖端曲率半径及栅圆环直径的影响情况，并模拟计算了该管的静态输出特性．另外通过改变尖锥及栅圆环的参数，详细研究了栅阴电容的变化情况，该模拟结果与已报道的实验结果符合较好．     

一种新型金属封装的光纤法珀温度传感器

设计制作了一种金属封装的光纤法珀温度传感器，该传感器采用不锈钢毛细金属管代替传统的空心光纤对光纤法珀腔进行封装，毛细金属管在作为法珀腔腔体的同时也是温度敏感元件。采用该结构简化了光纤法珀温度传感器的封装工艺，理论分析和实验的结果表明，该金属封装结构使得传感器的灵敏度易于控制，对于腔长为10mm的温度传感器其精度达到±0.5℃。     

W[111]场发射尖端的制作与使用

本文报道w[111]场发射尖端的制作,使用条件以及尖端的闪烁和重建。从实验得到其正常工作范围是尖端曲率半径在0.9～1.2×10～(-5)cm;第一阳极电位V_1在2～2.5KV之间。闪烁电压约3～4伏,时间0.5～2秒;w[111]尖端重建条件为尖端表面电场强度必须大于3×10～7V/cm,加热电压为30伏,时间1×10～(-2)秒。了解这些情况对场发射电子枪的正确使用和维护无疑是重要的,具有实用意义。     

聚合反应法制作液晶—聚合物薄膜

本文介绍了液晶—聚合物显示器件的制作中常用的几种方法。重点介绍聚合反应法及该法制作这种复合薄膜的优点、材料选择原则和以环氧树脂为基材的这种薄膜的制作工艺,在大量实验的基础上总结出的两类曲线,探讨了各自的用途。     

日本电气公司已试制出以20,000门为代表的CMOS门阵电路系列产品

目前,日本电气公司采用了世界最尖端的CMOS硅栅工艺技术,已把8个品种的高速门阵电路系列产品制作成功。该系列产品有:2,100、3,700、4,700、6,700,8,000、10,500、14,500和20,000等8种。     

MISiC高温氢气传感器研究

文章报道了采用NO直接氧化制备氮化氧化物作绝缘层，制备高灵敏度MISiC肖特基二极管式高温气体传感器的技术。采用NO直接氧化法，改善了器件的界面特性．实验结果显示，采用该方法制作的传感器具有高响应灵敏度和良好的响应重复性。     

多孔硅场致发射特性研究

目前真空微电子使用的场致发射电子源主要是在硅衬底上采用腐蚀法和生长法得到的场发射阵列。这种方法在制造上难度较大，也很复杂。本文介绍用阳极化的方法制造多孔硅场发射阵列，并通过实验测定，用此法制造的场发射尖端阵列的发射曲此，很好地符合Ｆｏｗｌｅｒ－Ｎｏｒｄｈｅｉｍ公式。     

矩形波纹波导驻波比随几何参量的变化特征

本文用等效薄膜法研究和计算了矩形波纹波导的几何参量对驻波比的影响。与实验对比的结果表明，等效薄膜是可行的，特别是用该方法给出的驻波比随几何参量的变化特征可用来指导矩形波纹波导的设计，为工程上设计和制作该波导提供了理论上的依据。     

An optical fiber probe based on multi-optical well particle capture

In this paper, a new method of constructing single-fiber optical tweezers is proposed, which can achieve multi-optical well non-contact capture on the same optical fiber, so as to reduce the difficulty of making single-fiber optical tweezers and enhance the operation function of single-fiber optical tweezers. We use the 650 nm laser source to excite high purity LP11 mode in 980 nm single-mode fiber, which can achieve the multi-optical trap capture effect around the fiber port after simple micro-staggered core fusion treatment for common single-core fiber. Optical fiber ports are fabricated using thermal method to construct special tip structures. Simulation and experimental results show the feasibility of the structure. The excitation and utilization of multi-mode beams in single fiber constitute a new development of single fiber optical trap, enrich the function of single fiber optical tweezers, and make more practical applications in biomedical research possible.     

MRI-compatible intensity-modulated force sensor for cardiac catheterization procedures

This paper presents a novel, magnetic resonance imaging (MRI)-compatible, force sensor suitable for cardiac catheterization procedures. The miniature, fiber-optic sensor is integrated with the tip of a catheter to allow the detection of interaction forces with the cardiac walls. The optical fiber light intensity is modulated when a force acting at the catheter tip deforms an elastic element, which, in turn, varies the distance between a reflector and the optical fiber. The tip sensor has an external diameter of 9 Fr (3?mm) and can be used during cardiac catheterization procedures. The sensor is able to measure forces in the range of 0-0.85?N, with relatively small hysteresis. A nonlinear method for calibration is used and real-time MRI in vivo experiments are carried out, to prove the feasibility of this low-cost sensor, enabling the detection of catheter-tip contact forces under dynamic conditions.     

基于聚类和特征检测的焊缝和钨针定位方法

钢管氩弧焊接过程中需要实时判断钨针针尖与钢管焊缝中心线是否对齐,以控制焊接质量。用肉眼判断误差较大,且效率较低。为此,提出一种基于聚类和特征检测的氩弧焊图像中焊缝中心线坐标和钨针针尖坐标位置计算方法。该方法利用幂次变换的方法增强图像对比度,用直觉模糊C均值聚类方法对图像进行二值化,用Canny算子边缘检测的方法提取图像特征,检测出钢管氩弧焊图像中的熔池、焊缝中心线以及钨针针尖位置。实验结果表明,该方法能够快速准确地定位焊缝中心线和钨针针尖位置。     

基于光学聚焦方法的热驱动微执行器位移测量

随着微机电系统（MEMS）设计日趋成熟,度量问题越来越成为微系统技术中的热点。使用改进的拉普拉斯求和方法（SML）和深度估计法来测量热度驱动微夹持器末端的弯曲程度。实验中,使用了10幅在42℃时微夹持器的水下工作图像来验证这种光学聚焦方法,结果证明使用光学聚焦方法可以测量出作为驱动器反馈输入的末端弯曲大小,实现对驱动器运动的精确控制。     

Photomixing in resonant laser-assisted field emission - a new technique for wide-band-tunable terahertz sources

When optical radiation is focused on a nanoscale field emitter tip, the potential and emitted current follows each cycle of the radiation field. Nonlinearity causes mixing of the optical radiation from two lasers so that current oscillations from dc to over 500 THz can be created at the tip. Several different methods are considered for coupling these signals directly from the tip, while avoiding losses from shunting by the anode capacitance, and prototypes are described that use two of these methods. Analyses, which are consistent with measurements of the current oscillations in field emission that are caused by a transistor-transistor logic amplitude-modulated laser diode, show that this technique offers promise as a new method for wide-band-tunable terahertz sources.     

Tapered single-mode optical fiber evanescent coupling

We describe the results of a numerical and experimental investigation of how a point source of radiation couples light to the HE ₁₁ mode of a tapered single-mode fiber. Specifically, we have investigated two different geometries of nonadiabatic, tapered single-mode optical fiber. The motivation for this study is the characterization of a single-mode tapered optical fiber biosensor. In such a device light is collected from fluorescent sources located along the cladding surface of the tapered fiber. Taper-to-taper coupling measurements and fiber mode calculations indicate the device sensitivity decreases exponentially as sources are moved away from the tip of the tapered fiber     

PSTM光纤探针几何形状研究

系统地分析了各种常见的不同形状探针，综合考虑其纳米区的能量耦合和模式耦合，并给出数值模拟结果。     

用准静态电磁场方法研究扫描近场光学显微镜的耦合特性

为了研究扫描近场光学显微镜(SNOM)中探针和粗糙样品表面的耦合相互作用,采用准静态电磁场理论的方法,提出了一种模拟SNOM的理论模型。在该模型中,探针和样品突起由极化偶极子表示,样品平面的诱导极化效应由影像偶极子表示,应用偶极子辐射理论可以得到系统的场方程,通过自洽的方法可以求出任意偶极子位置处的严格解析解。该方法与通过并矢传播子方法得出的结果完全相同,其优点在于实用性和计算的简便性。     

Effect of tip shape in the design of long distance electrostatic force microscopy

In this paper, it is shown that the tip as well as the cantilever (both conducting) act on the electrostatic force. The experimental results on force versus distance agree with the simulations derived from the Equivalent Charge Model. These simulations allow to determine the influence of geometry of the tip and bending of cantilever on the force exerting on the sensor. So, we predict the tip design and operating conditions (detection mode) to achieve the best resolution, particularly in long distance tip-sample in Electrostatic Force Microscopy.     

激光发散角测量的误差分析

为了研究产品装调过程中,套孔法和CCD成像法得到的激光发散角偏差较大原因,采用ZEMAX仿真进行了理论分析,并结合相关试验进行了验证。结果表明,在CCD白光观瞄系统中利用CCD成像法测量激光光斑大小时,由于白光与激光间存在光程差,计算激光发散角时,需要消除光程差导致的图像误差的影响。激光光斑大小与距离符合双曲线规律变化。近场条件下不成线性关系,CCD成像法测量得到的激光光斑图像偏大,计算得到的激光发散角远大于套孔法的测量值;远场条件下近似成线性关系,套孔法及CCD成像法测算得到的激光发散角数值基本一致。该研究可以根据产品的设计参量,消除光程差对激光激光束散角的影响,提高测量精度。