大容量存储器在压力信号采集系统中的应用

本文设计的压力信号采集系统主要用于石油井下来采集井底的压力信号。由于要求系统长时间的工作在井下,压力信号的存储需要大容量的存储器。因此,本文采用了低功耗、大容量的存储芯片。如何使用这种大容量的存储芯片,本文给出了硬件和软件设计方法并作了详细的说明。本文使用的大容量存储芯片硬件接口简单,通用性强。使用这种大容量存储器的压力信号采集系统稳定可靠,已通过了井下实验的测试,完全满足采集井底压力信号的要求。     

一种极化雷达校准信号源的设计与实现

为了校准极化雷达的接收通道,设计并实现了一种基于DDS软件编程技术的极化雷达校准信号源系统。给出了主要的硬件电路和软件设计方案。该系统将FPGA技术与DDS技术结合,在FPGA内部软件编程实现改进的DDS模块,充分利用了FPGA作为大规模芯片的资源优势和高速运算能力。系统能够产生高精度且稳定的任意雷达校准信号,可满足极化雷达标校的应用。     

基于ZigBee和S3C2440的手持式校准仪研制

为保证自动气象站各要素测量值准确性,需要定期进行校准。针对自动气象站的现场校准需要设计了一种手持式校准仪。系统采用ARM处理器及协调器进行硬件设计,使用WIN CE 5.0操作系统,选择C#开发语言在VisualStudio 2005开发环境中完成软件设计。校准仪利用ZigBee技术自动采集标准器及现场气象仪器的读数,并对气象仪器进行校准。该设备的使用可提高工作效率,方便现场校准,具有较好的实用性。     

MSP430F1101单片机低功耗模式及应用

介绍了MSP430Fll01单片机的低功耗模式，并采用MSP430Fll01设计了一种低功耗智能水阀，简要叙述了水阀的功能、硬件设计与软件设计。     

一种MLS地面静态标校测角接收机的设计与实现

从嵌入式系统高性能、低功耗、低成本特点出发，结合嵌入式 MLS 测角接收机的设计理念，开展了基于 ARM 微处理器的 MLS 测角接收机研制，详细介绍了硬件电路设计、信号处理软件设计和交互界面设计。测试表明，研制的 MLS 测角接收机功能、性能满足设计要求。     

基于DS18B20的测温系统设计

DS18820数字温度计是DALLAS公司生产的1-Wire,即单总线器件,具有线路简单、体积小、低功耗、高精度、抗干扰能力强等特点的数字温度传感器。简要介绍了DS18820的基本特点、引脚功能、内部结构和工作原理,给出了DS18820的实用电路、使用中的注意事项、硬件及软件设计方法。经过测试,该系统的测量精度及速度等指标均能满足设计要求。     

基于HART协议智能阀门定位器的研究

针对工控领域阀门控制系统对阀门控制精度高、能耗低的要求,对基于HART协议智能阀门定位器进行了研究,在符合设计要求的基础上,给出了二线制HART型智能阀门定位器的软硬件设计方案。硬件电路以主控芯片MSP430单片机为主,配以信号采样电路、阀位反馈电路、HART通信电路等组成硬件系统;软件设计采用模块化设计,各响应均以中断请求的方式进行。该系统满足系统的低功耗,阀位准确控制,具备HART通信等要求,对相关产品的研制具有指导意义。     

基于FPGA的电梯控制器设计

使用FPGA器件作为主控制芯片,采用模块化设计方法,通过硬件描述语言VHDL对电梯控制器各功能模块进行编程,实现了六层电梯控制器设计。经软件仿真和硬件实现,结果表明该方案能满足设计要求,并能扩展到多层电梯,有较强的实用性。     

现场型过程仪表校验仪的设计及应用

本文较为详细地说明了现场型过程仪表校验仪硬件及软件的设计方法,特别讨论了设计现场型校验仪所采用的低功耗设计和面板校准技术.     

基于Profibus-DP现场总线通信接口设计

Profibus-DP是一种开放性的国际现场总线,用于分散外部设备之间高速数据传输。SPC3是Profibus-DP专用智能通信协议芯片,集成了MAC和FDL层,实现了DP通信的处理,减轻了CPU的负担。采用MSP430单片机作为CPU,由于其具有高速率、低功耗的特点,能够很好地满足通信接口传输数据对速度的要求。概述了Profibus-DP总线协议,然后介绍Profibus-DP通信接口的硬件设计电路和软件设计。     

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.