用于通信基站的蓄电池监测系统的研制

本文介绍了一种用于通信基站的远程蓄电池巡回监测系统的设计和实现技术.该监测系统可以对基站电池端电压、充放电电流和电池温度3种主要参数进行监测.温度的测量采用数字式传感器DSI8B20.其供电设汁采用了闩锁保护技术以提高系统安全可靠性,测量数据能通过公网GPRS以无线数传方式实现集中监控.测试结果表明:此远程监测系统具有安全可靠、监测参数全面、数据传输稳定等特点.     

基于ZigBee无线传感网络的电池状态实时监控系统硬件设计

随着社会经济的快速发展,蓄电池在通信、电力、车辆以及工业照明等领域得到了越来越广泛的应用,开始扮演越来越重要的角色,因此蓄电池组的管理系统也变得越来越重要。要管理蓄电池组首先要获取蓄电池组中每块电池的参数和工作状态,要获取参数和工作状态就要用到大量的传感器,市场上的电池组管理系统通常都是用导线连接传感器,从而获得电池参数和工作状况。这就带来了接线繁琐,布线困难的问题。使用无线传感器网络技术能够解决上述问题,同时方便系统线路检测及今后的扩容。使用无线传感器网络技术的电源监测系统有望在今后得到普及。在比较了主流的几种无线传感器网络技术后,本文选择采用ZigBee技术来设计系统。在本系统中,无线终端采集节点对电池组进行实时数据采集,通过中继节点将数据转发给上位机终端程序显示,其他计算机可以通过客户端程序看到这些数据。同时本系统还能够通过调节均衡电路大电流低阻开关实现均衡充电,从而达到了对电池各项系数状态进行监控和管理的目的。本文所实现的系统是ZigBee技术在电池管理系统控制中的一个应用实例。本文给出了传感器节点硬件设计对于工业现场的电池组监测管理具有参考价值和借鉴意义。     

基于霍尔传感器的铅酸蓄电池监测系统的设计

针对铅酸蓄电池充放电电流存在的一些问题,以霍尔效应原理为基础,利用霍尔传感器其精度高、线性好、频带宽、响应快等优点,设计了霍尔传感器对铅酸蓄电池充放电电流检测的实现。本文着重介绍了监测系统组成,原理以及其应用。通过检测充放电电流,电池组单节电池电压等参数来实现对铅酸蓄电池进行监测。     

中高压断路器在线监测装置的设计与实现

为了对开关设备的重要参数能进行长期连续的监测,设计出一种采用DSP处理器加CPLD结构的在线监测系统,详细分析了行程信号采集、线圈电流信号采集、数据存储、通信和实时RTC等主要硬件模块的设计方案。系统实现了对高压断路器状态的在线监测和机械故障的诊断,为开关设备状态监测提供了一种可行的解决方案。     

蓄电池鼓包检测传感器的设计与实现

为了实现蓄电池鼓包检测,蓄电池鼓包检测传感器采用压力检测方法将传感器紧贴在被检测蓄电池表面,实现对6V/12V蓄电池鼓包状态365d×24h实时检测,并将检测结果实时显示在上位机监测系统中。实验结果表明：蓄电池鼓包检测传感器与现有的人工巡检方式相比,能够检测到蓄电池细微的鼓包,准确度达到98%以上,同时实现了实时在线监测。因此,蓄电池鼓包检测传感器能够促进对各个领域上蓄电池使用的科学性,延长蓄电池使用寿命。     

车船蓄电池在线管理系统的构建

蓄电池作为电动车船电能系统的直接电源,其维护工作对保证能源系统的安全运行具有十分重要的意义。实时监测蓄电池,及时发现失效单体电池,是蓄电池维护工作的重中之重,而目前电动车船蓄电池大多采用人工检测,工效很低。本文就车船蓄电池在线管理系统构建的格局、机理和特色等三大方面展开论述,旨在实现蓄电池在线监测功能的易用性和精准性,提高电池工作效率,减低运营成本。     

基于FPGA和以太网的多路传感器数据采集系统

为了实现加速度传感器批量标定测试,能让16个加速度传感器同时并行测试,设计了基于FPGA和以太网的多通道数据采集系统。该系统以FPGA为核心控制芯片,实现16路模拟信号的实时采集、编帧与数据存储,并通过以太网接口芯片W5300完成与上位机的通信。整个系统采用模块化设计,功耗低、采集精度及可靠性高、实时性好,已成功应用于加速度传感器批量标定测试设备中。     

基于LabVIEW的电动汽车电池监测预警系统

车载电池作为电动汽车的核心部件,如何有效的管理和利用蓄电池的能量,增加电池的使用寿命成为关键问题。文中介绍了一种基于STC89C52的蓄电池信息采集硬件平台,通过对A/D转换、串口通信、温度传感器控制等部分的完善,开发了完整的硬件数据采集系统,实现了对单体电池电压、电流、温度等基本信息的采集功能,运用LabVIEW搭建上位机数据处理平台,对适用于纯电动汽车的电池实时监测预警系统的研究,实现了电池基本信息测量、电量估计、故障报警等功能,以及对电池组进行合理有效的管理和控制,该系统工作中运行稳定,在实际应用中具有良好的参考价值。     

车船蓄电池在线管理系统的构建

蓄电池作为电动车船电能系统的直接电源,其维护工作对保证能源系统的安全运行具有十分重要的意义.实时监测蓄电池,及时发现失效单体电池,是蓄电池维护工作的重中之重,而目前电动车船蓄电池大多采用人工检测,工效很低.本文就车船蓄电池在线管理系统构建的格局、机理和特色等三大方面展开论述,旨在实现蓄电池在线监测功能的易用性和精准性,...     

绝缘子泄漏电流监测系统设计

通过监测输电线路中绝缘子的泄漏电流来判断绝缘子的污秽程度,以避免绝缘子发生污闪的情况。设计了一种绝缘子泄漏电流实时监测系统,系统主要包括泄漏电流传感器、泄漏电流放大与滤波模块、泄漏电流ADC转换模块、主控模块、无线通信模块和终端等功能元件。系统能够实现对绝缘子泄漏电流信号的在线监测、处理、采集、显示与传输等功能。实验结果表明,系统具有高精度的数据采集能力,对泄漏电流信号监测相对误差小于2%,满足对绝缘子泄漏电流监测的要求。     

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.