采用CAN总线的铁路机务段实验台的数据平台

文章介绍了一个基于CAN总线的数据采集系统的设计。说明了CAN总线的特点 ,并着重阐述了CAN通信节点的通信原理和SJA10 0 0的初始化程序框图。该系统在工业实际中应用取得了预期的作用。     

基于MPC5668G的汽车CAN总线网络实现与研究

文章阐述了汽车CAN总线通信的原理,并基于MPC5668G微控制器设计了汽车CAN总线的软硬件系统,并详细说明和分析了该系统的网络总体结构、CAN总线接口与节点。MPC5668G芯片是飞思卡尔公司专为汽车通信开发的单芯片微处理器,适用于汽车CAN总线高、低速网络。文章介绍了高、低速CAN总线在汽车网络中的重要性,在目前汽车电子及控制领域中具有广阔的发展空间和应用前景。     

基于FPGA的CAN总线通信系统的设计

为了避免单片机的缺陷,同时满足工业上稳定,精确的数据通信需求,在此提出了基于FPGA的通信系统,通过控制CAN控制器SJA1000,从而实现CAN总线的数据通信的设计。介绍了该系统的硬件结构和设计原理,针对FPGA的控制流程和原理进行了分析和设计;实验结果显示,该CAN通信系统满足通信需求,较以往的单片机CAN通信系统具有更高性能和优越性。     

矿山CAN总线数据采集系统的设计

介绍了一种CAN总线数据采集系统的设计。说明了CAN总线的特点，同时阐述了CAN通信节点的组成和通信原理。该系统在工业现场收到了预期的效果。     

基于CAN总线的计算机联锁通信系统研究

本文主要阐述了在全电子计算机联锁系统中利用CAN总线进行安全通信系统的设计,介绍了基于CAN总线的联锁通信系统的结构、数据通信方式、主要功能特点以及软件设计思想,并利用CAN总线实现了联锁系统的实时数据通信。     

基于CAN总线和无线技术的输液网络监控系统

为实现大中型医院静脉输液网络化与智能化,设计了一种利用CAN总线和无线技术的输液监控系统。该系统包括执行机节点、CAN总线网络、主节点、无线数据收发系统、控制主机等。无线通信模块采用2.4 G的nRF2401通信芯片,而CAN总线通信模块采用SJA1000和PCA82C250,通过单片机控制,实现与其他节点通信。试验表明所设计的CAN总线和无线通信系统均能正常工作,数据传输错误率为0%。     

天线伺服系统多电机同步控制研究

详细介绍了一种应用于大型天线系统的多电机同步控制系统的设计。可编程计算控制器PCC通过CAN总线与驱动器DC590通信,采集驱动器电流反馈,经同步消隙控制算法后向各支路驱动器输出速度控制命令。驱动器采用独立的速度环,在50 m及65 m射电望远镜天线伺服系统应用中取得了良好的伺服控制精度。PCC可以根据驱动器状态灵活配置驱动器工作组合,提高了系统的可靠性。     

现场总线在并联逆变电源系统中的应用

提出将现场CAN总线引用到并联逆变电源系统中的设计理念,对逆变器并联技术进行分析,由此提出一种利用CAN总线实现各逆变单元的通信,最终实现消除各逆变器之间环流的方案。介绍CAN总线的特点,并利用DSP2407A实现逆变器的控制和CAN总线的通信,同时给出CAN总线的软件设计。最后在Matlab平台上对系统进行仿真,仿真实验结果证明:利用CAN总线可以更好地实现该电源系统的稳定性和抗干扰性。     

基于CAN总线的微机继电保护系统

介绍了一种基于CAN总线的电力系统微机继电保护系统设计,设计了该微机保护系统总体结构,分析了传统模拟式继电保护装置的不足,给出了系统的硬件设计与软件设计流程。系统串行通信采用CAN现场总线技术,提高了通信的快速性、可靠性。     

基于CAN总线的单片机通信交换系统

介绍了基于CAN总线的单片机多主通信原理、MT8816模拟电子开关矩阵与89C51单片机的接口,以及它们在单片机通信交换系统中的应用。该系统的实际使用效果良好。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.