一种可调线阵CCD信号采集处理系统

在线阵CCD信号采集系统中,实时更改CCD芯片的驱动脉冲频率和光积分时间可以提高整个系统的测量精度,为此设计了一种基于FPGA的线阵CCD信号采集处理系统,此系统可以灵活地调节CCD驱动波形,并可以根据CCD的输出信号调整FIR数字滤波单元的截止频率.系统通过USB2.0接口接收PC机的设定参数对CCD驱动单元和FIR数字滤波单元进行配置,然后将处理数据上传至PC机.实验结果表明:系统控制灵活、集成度高,能够满足线阵CCD信号采集系统多种应用场合的需要.     

基于USB和Camera Link的数据传输系统设计

为了使CCD相机和上位机之间能够进行简单、实时的数据传输,提出一种以USB和Camera Link接口相结合的数据传输系统设计方案。通过FPGA对接口芯片进行控制,使用VHDL语言进行逻辑电路的设计,并采用VC++编写上位机软件。实现由USB接口接收数据,USB或Camera Link接口输出数据。实验表明,设计的系统能够准确、实时地接收控制命令和向上位机发送高速率、大容量的图像数据,可以应用在不同数据传输要求的CCD相机中。     

基于线阵CCD与小波去噪的光谱数据采集系统研究

为实现光谱数据高效稳定的采集、存储、传输及显示,提出了基于线阵CCD与小波去噪的光谱数据采集系统的实现方法.系统完全依靠FPGA控制线阵CCD模块及AD转化模块、信号调理模块、电源模块,完成光谱数据采集、存储.通过USB2.0接口将数据稳定传输至上位机,对光谱数据进行中值与小波混合算法去噪处理,最终获取光谱曲线.系统使...     

基于FPGA的USB数据采集系统设计

介绍了一种数据采集系统的设计,该系统以FPGA作为逻辑控制的核心,以USB2.0作为与上位机数据传输的接口,能实现上位机和下位机的数据传输。文章描述了系统的主要组成和FPGA模块化设计的实现方法,主要介绍了USB通信开发并给出了其核心模块的时序仿真波形图。实验证明能通过该USB接口采集数据信息。     

基于FPGA的USB数据采集系统设计

介绍了一种数据采集系统的设计,该系统以FPGA作为逻辑控制的核心,以USB2.0作为与上位机数据传输的接口,能实现上位机和下位机的数据传输。文章描述了系统的主要组成和FPGA模块化设计的实现方法,主要介绍了USB通信开发并给出了其核心模块的时序仿真波形图。实验证明能通过该USB接口采集数据信息。     

FPGA的USB2.0通信接口的开发

为了实现FPGA与USB之间的数据传输,介绍了USB2.0通信接口的硬件设计,USB固件程序的编写以及利用MFC编写上位机程序。通过把FPGA存储的数据用USB接口传输给上位机并保存,采用了USB的同步Slave FIFO的接口模式和Bulk的传输模式来传输数据。实验结果表明基于FPGA开发的USB2.0接口工作正常,满足USB2.0接口规范和设计要求。     

基于FPGA和USB接口的多通道数据采集系统

针对实现多通道测距雷达信号的数字化采集的目的．设计了一种基于FPGA和USB接口的多通道数据采集系统。该系统采用在FPGA芯片中构建多个数字逻辑模块的方法,实现对AD芯片模数转换过程的控制。并利用IP核在FPGA中构建存储器,对采样得到的数据进行缓存,最后通过USB2．0接口芯片将缓存中的采样数据及时传输至上位机。通过...     

基于FPGA的智能仪器远程控制系统设计

为实现智能仪器的远程控制,提高控制系统的速度,采用现场可编程门阵列（FPGA）芯片、USB芯片等实现了智能仪器远程控制系统的设计。重点介绍RS 232与USB的接口转换原理及FPGA程序设计和仿真。系统采用先入先出存储器和有限状态机实现了RS 232与USB的接口转换,并实现上位机的控制、数据处理等功能。系统可大大减少上位机的工作量,不仅可以用于实验室也可应用在工业生产中。     

基于FPGA和USB2.0的数据采集系统

本课题设计了一套基于FPGA和USB2.0的便携高速数据采集系统,以FPGA最小片上系统为控制核心,对A/D转换芯片TLC5510和USB2.0接口芯片CY7C68013的控制,来实现对信号的高速采集和传输。     

基于FPGA和USB2.0的多路音频信号采集系统

本文介绍了一种基于FPGA与USB2.0的多路音频信号采集系统。采用XILINX公司的FPGA为控制芯片,以USB2.0为接口实现FPGA和PC机之间的高速数据传输。通过软硬件技术的结合实现了对多路音频模拟信号的采集。并介绍了固件(fireware)和USB设备驱动软件的开发。     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks