基于无线传输的高速摄像机远程控制系统

目的：研究基于无线传输的远程控制系统。方法通过微控制器结合无线数传模块的方式完成高速摄像机的远程控制。结果设计了基于微控制器和无线模块的远程控制系统。结论远程控制系统为高速摄像机的远程触发提供了一种有效的手段。     

互联网协议摄像机和H.264压缩技术在安全监控系统的应用

引言 闭路电视系统（CCTV）中的IP摄像机按照互联网协议（IP）通过以太网链路传输音频、视频数据以及控制信号。与传统的模拟安全监控摄像机相比,它们具有众多优势。模拟摄像机一般通过同轴电缆传输模拟NTSC/PAL信号。与模拟摄像机不同的是,IP摄像机支持高清（HD）画面、智能分析、本地视频存储和远程控制。     

激光雷达多通道高速数据采集系统设计

设计了一款“FPGA+DSP”架构的高速数据采集系统,可对激光雷达的多路回波信号进行同步并行采集,数据反演及远程传输。FPGA在同一触发信号激励下,可对输入的四通道回波信号进行高速采集、累加、存储;DSP读入四个通道的累加结果,求平均后进行反演,并以TCP/IP协议实现数据的远程传输。设计完成的数据采集系统在一台“米”散射激光雷达系统中进行了测试,结果表明：该系统可对脉冲重复频率为1khz的多路回波信号以20 mHZ的频率进行采样,并可对5000次的回波信号进行对应点累计平均,完全满足激光雷达数据采集的特定要求。本系统具有性价比高、便携、可实现数据的远程共享,在多光谱激光雷达及高光谱分辨率激光雷达的数据采集中具有推广价值。     

以太网供电视觉帧接收器

NI PCIe-8233、NI PCIe-8236和NI PCIe-8237RGigE是采用PoE技术的视觉帧接收器。PCIe-8237R配有基于NI LabVIEW FPGA的I/O,包含隔离的数字输入和输出,以及用于实现自定义计数器、PWM信号和正交编码器输入的双向TTL线。该产品还提供了高级触发和同步选项,例如低抖动、低延迟且基于FPGA的网络触发器以及队列脉冲支持等,这些选项使得帧接收器通过一个API就可以实现传感器、相机触发、分拣装置以及视觉系统其他部分的紧密同步。     

线路板与系统

同步时间少于40ms的PCI帧接收器 Euresys公司的Eure Card Picolo ProⅡ帧接收器能把PAL、SECAM或NTSC、CCIR或EIA(RS170)复合信号,或者S视频、彩色或黑白信号直接传送到PC存储器上。这种帧接收器能以每秒至少12.5帧图像的速率从4台非同步摄像机获取图像。电话(32)4-367 7288,传真:(32)4-367 7466     

远程高速激光外差信号的高灵敏度探测器研究

针对多轴、高速和超精密激光干涉测量系统对光电接收器在探测灵敏度、响应带宽和稳定性等方面的特殊需求,提出一种基于远程探测的高带宽激光外差信号探测方法。首先,针对多轴激光干涉测量中多个传统光电接收器热耗散大、严重影响测量精度的问题,设计远程光纤探头,将光接收与光电信号处理部分完全分开,彻底消除光电接收器热耗散对测量系统的影响;其次,针对单光轴光功率微弱、难以探测和稳定性差的问题,设计具有主动温度漂移特点的APD高压反向偏置电源,在提高光电接收器探测灵敏度的同时增强其温度稳定性;设计的光电探测器能够实现远程光耦合传输,耦合效率能达到38%以上,最大探测灵敏度为0.52μW,测量带宽可达17.5MHz,满足多轴、高速超精密激光干涉测量系统对光电接收器的性能需求。     

多传感器同步图像采集系统的设计

提出了一种宽带宽、灵活的和可伸缩的多传感器同步图像采集系统的结构.设计了二进制树型拓扑结构传播统一的系统时钟和触发信号,采用CPLD提供传感器间的精确时序和同步.结构中的所有摄像机采用CMOS图像传感器采集图像.可以控制图像的尺寸、帧率以及摄像机之间的曝光顺序.为了适应不同应用对传输带宽和图像质量的不同要求,采用DSP加多种压缩算法对图像进行处理和压缩.来自所有摄像机的图像数据通过USB2.0总线采用同步传输模式传送到PC进行存储.给出了部分实现.     

康宁Plug & Play通用系统可支持100G以太网传输

康宁公司电信业务部的康宁光缆系统部近日宣布,其Plug & Play通用系统已经达到了100G以太网就位水平,能够通过OM3光纤为达到100G的传输速度提供稳定支持。对于使用OM3光纤的40G与100G以太网速度来说,并行光是最主要的传输方式。并行光技术将高速数据传输信号多路复用,或者在几条光纤中进行同时传输与接收,在接收器这一端,信号会接受解复用,从而还原成原始的     

利用光纤收发器实现远程高速数据采集

根据同步串行传输原理,利用光发射/接收器件设计成光纤传输系统,将从数据源得到的数据进行远程高速传输,并在高帧频CCD图像远程采集系统中得到了成功的应用.     

基于千兆网的高帧频视频采集系统

高帧频视频图像采集是测试技术领域的重要组成部分,系统根据B码时统的高精度信号,由控制计算机通过软件修正摄像机曝光信号时间,实现了高帧频视频图像和测控数据的同步采集,设计了一种无信息损失的高帧频(1 000 F/s)、高分辨率视频图像和测控数据同步采集系统。利用千兆以太网把图像数据从相机的FLASH内无失真转储到计算机硬盘内,并在转储过程中把同步测量数据合成到对应的图像帧频上。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

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.     

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.