基于PCI Express的高速红外图像采集系统

介绍了一种基于PCI Express(PCI-E)总线的高速红外图像采集系统.重点介绍了PCI-E图像采集板卡的硬件设计和主机的软件设计,PCI-E图像采集板卡采用了基于FPGA的硬件结构,主机的软件设计包括驱动程序和应用程序两部分.经实验测试,此高速红外图像采集系统能完成红外图像的实时采集、显示及存储,性能稳定可靠....     

MOVIE—2数字视音频扩展总线

目前非线性编辑系统在电视制作领域得到了广泛的应用,这些非线性编辑系统主要以计算机为平台,加上各种处理视、音频的板卡及磁盘阵列组成。其中视、音频板卡要完成视音频信号的输入/输出、压缩/解压缩、视频处理及特技,它们之间需要进行大量的数据交换。实现这些板卡间的数据交换,一般有两种方法:一是使用计算机主板上的总线,如PCI总线;二是使用扩展总线,如由加拿大Matrox公司发起,并由许多硬件厂商支持的MOVIE—2扩展总线。由于计算机主板上的总线传送数率比较低且占用系统资源,故越来越多的专业视频板卡采用MOVIE—2扩展总线。     

多总线兼容的板级测试系统设计

由于不同板卡的总线接口不同,对板卡的测试也需要多种测试系统,因此成本较高。针对以上问题,设计了一种能兼容多种总线的板级自动化测试系统。介绍了系统的硬件构建方法和工作原理,重点论述了多种总线接口兼容和不同种类信号切换的实现途径。实际应用表明,该系统具有通用性强、速度快、可靠性高等优点。     

基于PCI总线的电视图像处理仿真系统设计

为便于科研人员在电视图像处理系统设计过程中对图像处理的新算法进行评估和测试,降低评估测试板硬件电路的设计复杂性,在此提出了解决方案,并实现了基于PCI总线的电视图像实时仿真系统的设计。该系统首先通过PCI插卡实现对电视图像进行采集、预处理和视频A／D转换,然后选用具有高速特性的PCI总线将数字化后的数字图像信息写入计算机系统内存,最后在计算机终端上,使用高级语言编程,完成图像处理和控制接口软件开发,实现计算机软件对PCI硬件设备的访问,数字图像的实时处理、分割、匹配等算法仿真。     

基于PCI总线的1553B总线接口电路的设计与实现

本文介绍了PCI总线和MIL-STD-1553B总线转换的实现方法。该设计使用PLX公司的PCI9052和DDC公司的1553B协议芯片BU-61580,通过ALTERA公司的FPGA芯片EP1K100进行PCI协议和1553B协议的转换。使用Visual C 完成对PCI的读写操作,进而控制61580芯片实现1553B总线的数据传输。最后成功实现了用计算机通过PCI卡完成1553B总线控制器(BC端)的功能,并通过了系统测试。     

基于AD5504的多路信号源的设计与实现

针对目前多路信号源DA通道切换及其调理电路的复杂性问题,结合测试系统对于模拟高压信号源的要求,设计了一种基于AD5504的多路模拟信号源。该板卡以FPGA作为系统控制器,PCI9054作为PCI总线协议芯片,信号源包含32路0-28V波形、幅值、占空比可调模拟电压,通过8片四通道DA转换芯片AD5504进行DA转换。经多次测试,该板卡可可靠输出所需模拟电压且达到输出电压误差小于满量程的0.2%,各通道的功率小于0.4W,稳定性高,对于高压模拟信号源的设计有一定的参考价值     

新型民航气象传真广播系统卫星通信板卡设计与实现

民航气象卫星传真广播系统于1995年投入使用后,限于当时技术条件,卫星通信板卡采用ISA总线设计,兼容性差,速率低,硬件集成度低,稳定性和抗干扰能力不高。随着计算机和控制技术的不断发展,PCI总线接口速度快,内存占用率低,有完备的即插即用(PnP)管理体制,是目前计算机插卡式外设总线的事实标准。文章介绍了一种基于LINUX操作系统的PCI总线的卫星通信板卡的硬件设计和相应驱动软件的设计与开发实现。该新型的通信卡为民航气象卫星传真广播接收系统的升级和改造提供了高附加值的解决方案,同时,也可以应用于其他通信业务行业,如航空航天等部门。     

基于PCI总线的信号采集卡的实现

PCI总线是PC主机最常见的总线,基于PCI总线形成的Compact PCI和PXI总线广泛地应用在仪器和自动化领域。PCI总线测试卡的接口设计变得越来越重要。本文主要介绍PCI专用接口电路PCI9052的功能,并应用在测试板卡上,实现我们所需的信号采集功能。     

基于Xilinx PCI Express Core的高速DMA读写设计

本设计在基于Xilinx Virtex-6 FPGA内嵌PCI Express Core的基础上,实现了由PCI Express板卡主动发起的DMA读写,可完成PC和PCI Express板卡之间数据的高速传输。该设计已经在Xilinx评估板ML605上完成调试验证,DMA写内存速度稳定可达1 520 MB/s,满足了高速存储系统的要求。     

基于SystemVerilog的多通道ARINC429总线通讯板卡的设计

为解决航电系统仿真验证过程中大多数ARINC429板卡软件定时不精确、不可靠的问题,拟从硬件上实现多通道、并行、高精度定时循环发送,采用基于标准SystemVerilog语言智能配置循环存储器的方法实现优化定时功能,提出一种多通道航空总线通信板卡设计方案。该方法采用通用网络接口与计算机连接,在基于LabVIEW的航空总线测试平台下,对所设计板卡进行测试和验证,结果表明该方法能够满足多个通道并行定时发送数据的要求,并且各项指标符合ARINC429电气标准。     

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.     

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.     

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.     

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.     

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.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.