通用STM控制软件的设计

介绍一种在ＷＩＮＤＯＷＳ环境下运行的通用扫描隧道显微镜（ＳＴＭ）系统控制软件，并给出了主要的程序框图。该软件在改进扫描隧道显微镜的控制方面取得了良好的效果，有一定的实用价值。     

基于计算机仿真的扫描隧道显微镜原理分析

扫描隧道显微镜被广泛应用于材料表面研究,单原子操纵等前沿物理中。但是,目前的扫描隧道显微镜的原理分析主要是基于量子物理中的薛定谔方程。我们试图从经典物理出发推导扫描隧道显微镜中的高度与电流的关系,并同量子物理中的结论做以比较。从而验证经典物理在纳米量级应用的可行性,并深化对经典物理与量子物理之间的理解。     

光子隧道效应的检测及显微术

本文提出了光子扫描隧道显微技术的机理,对光子隧道效应进行了实验研究,在国内首次检测到了光子隧道效应,文中还介绍了我们所研制的一套光子扫描隧道显微镜系统的工作原理、设计思想及已解决的几个关键技术问题,并利用该系统获得了不镀膜、镀银膜、镀硫化锌膜这三种不同样品的实验数据,实验结果与光子隧道效应理论完全相符。     

宽范围扫描隧道显微镜控制系统

结合宽范围扫描隧道显微镜系统设计，证明了控制系统的信噪比和频带宽度的关系， 给出了高压宽带低噪声驱动电路和双极性输出开方电路。     

纳米分辨近场光学显微成象技术现状

介绍了纳米分辨近场光学显微成象技术现状,近场光学显微成象技术大体可分为小孔扫描近场光学显微镜（Ａ－ＳＮＯＭ）、无孔径用射扫描近光学显微镜（Ｓ－ＳＮＯＭ）和光子扫描隧道显微镜（ＰＳＴＭ）三种基本类型,除介绍这三类近场光学显微镜简要成象原理、现状和各自特点外,还重点介绍了大连理工大学纳米成象技术研究组ＰＳＴＭ的研究进展,即ＰＳＴＭ消假象数值模拟和实验研究结果,其实验空间分辨首次达到２．８ｎｍ线扩展函数     

超微粒氧化锌薄膜的制备及表面STM观测

作者在大气、常温环境条件下，对采用直流气体放电活化反应蒸发沉积法制备的超微粒氧化锌薄膜的表面构象进行了扫描隧道显微镜观察，获得了一些用传统电子显微镜所难以观察到的新现象，并结合工艺条件对其构象作了一定程序的解释，提出了热处理对其表面构象的影响。     

超微粒氧化匀薄膜的制备及表面STM观测

作者在大气、常温上，对采用直流气体放电活化反应蒸发沉积法制备的超微粒氧化锌薄膜的表面构象进行了扫描隧道显微镜观察，获得了一些用传统电子显微镜所难以观察到的新现象，并结合工艺条件对其构象件一一定程序的解释，提出了热处理对其构象的影响。     

扫描探针显微镜及其在光盘开发中的应用

本文简要介绍了扫描探针显微镜的原理和技术特点,并详细地阐述了它在光盘研究与开发中的应用。一、扫描探针显微镜扫描探针显微镜(ScanningProbeMicroscope),简称SPM。SPM技术是80年代发展起来的一种突破性的     

扫描隧道显微镜微动台的有限元分析与实验研究

设计了一种以基于尺蠖运动原理的微动台为核心的扫描隧道显微镜(STM)机械机构,利用有限元方法对微动台部分的结构进行分析,对其静态、模态特性进行了实验研究。结果表明:微动台具有较大的行程和较好的稳定性,载物力可以达到16.7 N,最小步距约8.8 nm,行程14mm。     

STM三维图象处理在微机上的实现

本文介绍了可在微机上运行的扫描隧道显微镜三维图象处理程序。程序运用平移、比例、旋转、透视等几何变换将样品表面形貌以适当的位置、大小和角度显示在二维屏幕上,经消隐和明暗处理加强图象的立体感、真实感和清晰度,通过颜色模型转换将图象以灰度或混合过渡颜色绘制在高分辨显示终端上,实现 STM 数据的三维立体显示,进一步加强仪器的数据处理和显示功能。     

用计算机图象处理技术重建三维金属断口

本文利用图象处理技术提出了一种简单、实用、非破坏性地获得断口表面三维信息的方法。籍此可获得目前其它手段无法得到的断日真实表面积。这些三维信息的准确程度与激光扫描显微镜所选用的放大倍数、截面间距有关。如果能把本文所采用的平行截面法融人激光扫描显微镜的软件中，有可能实现三维微观信息的实时动态观察。     

Nt_STM: A step forward in Scanning Tunneling Microscopy (STM) simulations

We present the Nt_STM software suite designed to help analysis and interpretation of Scanning Tunneling Microscope (STM) images, via the simulation of STM data under different tip and bias conditions and facilitating their comparison against the experimental ones. The Nt_STM package includes two components: (i) an intuitive and directive Graphical User Interface (GUI) designed to build a precise model of the STM set-up and analyze the simulation results and, (ii) a powerful simulation engine (GREEN) allowing an efficient, yet accurate, calculation of the tunneling current necessary to generate current or topographic images, I(V) spectra as well as various properties such as band structures, Local Density Of State (LDOS), etc. The Nt_STM package, at its current version 2.0, gives the opportunity to access parallel computation, a new collection of objects and new Extended Hückel parameters.     

基于RTLinux的AFM实时反馈控制系统

为了提高原子力显微镜(AFM)的测量性能,利用RTLinux良好的实时性,设计了一种开放式的反馈控制平台,完成了基于RTLinux的AFM实时反馈控制系统的软硬件设计,并在PC上具体实现这种实时反馈系统。测试结果表明,该系统能较好地实现AFM在Z方向上的实时反馈控制。利用该平台良好的开放性,可以将各种先进的控制方法应用于AFM系统中,以提高原子力显微镜的扫描速度和精度。此外,该基于RT-Linux的AFM系统还可以扩展成为一个开放式的纳米操作平台。     

Three-dimensional reconstruction for scanning electron microscope

The paper describes the reconstruction algorithm of the 3D shape of a microobject’s surface based on an image stereopair, acquired with a Scanning Electron Microscope (SEM). Presented is the model of constructing the image in a SEM. The corresponding points are detected by using the SIFT algorithm. Employing the RANSAC method the points of correspondence are used to define the relative position of an object in a stereopair. A point cloud is created in a 3D space and interpolated in order to reconstruct a 3D surface.     

一维计量型微位移工作台的研究

本文介绍了一种以衍射光栅作为计量标准器的垂直方向上的微位移工作台,用来实现在白光扫描干涉轮廓仪的表面形貌测量中Z方向上的精密定位,该工作台实现了轮廓仪的闭环测量和控制,文章重点讲述了光栅信号处理的硬件及软件细分技术,以及压电陶瓷驱动电路的原理和工作台闭环定位控制的流程.     

Automation of Challenging Spatial-Temporal Biomedical Observations With the Adaptive Scanning Optical Microscope (ASOM)

Biological studies, drug discovery, and medical diagnostics benefit greatly from automated microscope platforms that can outperform even the most skilled human operators in certain tasks. However, the small field-of-view of a traditional microscope operating at high resolution poses a significant challenge in practice. The common approach of using a moving stage suffers from relatively low dynamic bandwidth and agitation to the specimen. This paper describes an automated microscope station based on the novel Adaptive Scanning Optical Microscope (ASOM), which combines a high-speed post-objective scanning mirror, a custom design scanner lens, and a microelectromechanical systems (MEMS) deformable mirror to achieve a greatly expanded field-of-view. After describing the layout and operating principle of the ASOM imaging subsystem, we present a system architecture for an automated microscope system suitable for the ASOM's unique wide field and high-speed imaging capabilities. We then describe a low-cost experimental prototype of the ASOM that demonstrates all critical optical characteristics of the instrument, including the calibration of the MEMS deformable mirror. Finally, we present initial biological (living nematode worms) imaging results obtained with the experimental apparatus and discuss the impact of the ASOM on biomedical imaging activities.      

Obtaining Shape from Scanning Electron Microscope using Hopfield Neural Network

In the environment of the Scanning Electron Microscope (SEM), it is necessary to establish the technology of recovering the 3D shape of a target object from the observed 2D shading image. SEM has the function to rotate the object stand to some extent. This paper uses this principle and proposes a new method to recover the object shape using two shading images taken during the rotation. The proposed method uses the optimization of the energy function using Hopfield neural network, which is based on the standard regularization theory. It is also important to give the initial vector that is close to the true optimal solution vector. Computer simulation evaluates the essential ability of the proposed method. Further, the real experiments for the SEM images are also demonstrated and discussed.     

Scanning on the fly: An approach to the user interface

Educational software must provide a “friendly” user interface in order to prevent student frustration. A recurring source of student frustration is the task of responding to prompts issued by the computer. Scanning on the fly reduces the difficulty of this task. It prevents the possibility of errors of form in student responses by accepting only keystrokes that lead to correctly formatted responses. This approach has the advantage that all text displayed by the computer pertains to the content of the lesson and none to the technical use of the computer. Its implementation is based on the notion of a finite state automaton, yielding reliable and easily modifiable software. Scanning on the fly has been used in the development of microcomputer-based instructional software for college algebra and trigonometry.     

虚拟专用网络及其隧道实现技术

这篇文章阐述了VPN及其隧道技术,分析了第二层隧道协议和IPSec第三层隧道协议的实现原理,然后对各种协议做了深入的比较,包括实现难度和性能等,最后对VPN的未来进行了预测并说明了技术实现的趋势。     

FY-1延时云图校正算法及实现

提出一种星上实时处理延时云图资料的算法,运用于ＦＹ－１（０２）气象卫星遥感系统全球延时云图（ＧＤＰＴ）处理机。通过该算法对地球信息分区变速率采样,能够校正由于地球曲面而引起的图像几何畸变,在遥感系统扫描辐射计ＧＤＰＴ处理机采用微处理器和嵌入式软件结合实现了该算法。实验结果表明,在３６０ｒｐｍ的光机扫描速率下,ＧＤＰＴ处理机在整个被测目标扫描视场内地面分辨率平坦起伏≤５％,均值＜３．１ｋｍ。