在线仪表在水厂自动控制系统中的应用分析

近几年来,随着自动化检测技术的飞速发展,自动化检测仪表具有测量精确、显示清晰、操作简单的优点,在各个自动化控制系统中得到广泛系统。水厂直接关系到人们生活、工业用水质量,因此,在水厂自动控制系统中应用在线检测仪表具有重要意义。本文首先介绍主要的自动化在线仪表种类,然后分析在线仪表在水厂自动控制系统中的应用,以望对此有更深的理解。     

热镀锌带钢湿膜厚度在线测量系统的研究

钝化膜厚度的在线测量可为热镀锌带钢生产过程中的涂膜厚度控制提供客观指导.介绍了热镀锌带钢钝化膜厚度在线测量的重要意义,描述了近红外测厚仪的工作原理,并重点研究了一种由近红外测厚仪、接口单元和PC机组成的热镀锌带钢钝化膜湿膜厚度在线测量系统,包括该系统各组成部分的功能和应用效果.     

电感耦合在线阻抗测量及其电磁兼容应用

在线阻抗测量可为许多电磁兼容应用提供有用信息。在已有的一系列在线阻抗测量方法中,电感耦合法因其测量装置与被测系统无直接电接触从而简化了现场实施操作并消除了电气安全隐患。文章综述了本团队近几年在电感耦合法及其电磁兼容应用方面取得的主要研究成果,详细介绍了本团队所提出的频域双探头装置、时域双探头装置和频域单探头装置这三种电感耦合测量装置的原理及实现方法,比较了其各自的优缺点;重点阐述了电感耦合法在光伏系统的辐射发射评估和变频驱动系统的噪声源阻抗提取中的应用,并提出了未来的研究方向建议。     

基于网络的DSP远程在线升级实现

工程应用中的DSP程序烧写依赖于开发环境和现场操作,远程设备无法进行升级,增加了程序升级操作的复杂性。文章提出了通过网口进行DSP程序在线升级更新的方法,提高了DSP系统的可维护性和可扩展能力。采用引导程序加载用户程序,将DSP程序分为独立的Userbootloader引导程序和可升级的用户程序两部分,确保在线升级的可靠性。该方法已成功应用于工程实际中,给软件维护和升级带来了极大的方便。     

通用CCD输出信号微机接收的接口设计

一、CCD器件简述CCD(Charge-Coupled Devices)是一种功能器件,它与真空摄像管相比具有无灼伤、无滞后、低电压等特点,特别是近两年来,利用 CCD 器件完成动态在线测量,受到人们的关注。但是,在动态测量过程中,CCD视频信号的输出频率很高,给用户使用带来了困难。针对应用中的具体问题,本文就用于在线测量的     

傅里叶变换红外光谱技术在多组分烟气在线监测中的应用

烟气排放造成了严重的环境污染,其组分复杂和恶劣的检测环境对在线检测带来极大的困难。介绍了基于傅里叶变换红外光谱技术的烟气多组分在线FTIR监测系统,该系统对烟气气路采用全程180℃伴热方式,并对多次反射池进行高温伴热,解决探测过程中烟气的冷凝和吸附损耗等问题。该系统可用于烟气中二氧化硫、氯化氢、氮氧化物等多种气体浓度的监测。采用该系统与MCS100FT烟气在线检测系统进行实时比对实验,测量结果具有良好一致性。实验表明对抽取烟气进行全程高温伴热方式的FTIR在线监测系统可用于烟气中多种气体浓度的测量。     

圆光栅测角传感器在线自校准系统研制与实验

为了解决测角系统在实际应用中的在线校准问题,设计了一种圆光栅测角传感器在线自校准系统。基于圆封闭原则和傅里叶级数的性质,建立了测量值与单读数头误差之间的关系,实现单读数头自校准。该自校准系统由读数头、玻璃圆光栅、单轴转台和多通道采集控制系统组成。实验结果表明,测角传感器自校准系统的单读数头测量精度为5.90,接近于借助外部参考标准的谐波补偿方法后的精度,系统测量重复性小于0.76。自校准测量系统可实现圆光栅测角传感器在线校准的同时,满足了精密测量领域对精度和可靠性的要求。     

电缆运行状态智能综合在线监测技术

在线监测系统为电力电缆的安全运行提供了可靠的保障,文章通过介绍在线监测技术在蚌埠市110k V地下电力电缆中的应用情况,展示相应的在线监测技术,包括局部放电的在线监测、电缆金属护层接地线电流监测,电缆接头温度测量以及电缆井内的水位和气体监测等,同时分析了在线监测技术在电缆应用中的优势以及存在的问题,最后探讨了在线监测技术在电网中的应用和发展方向。     

绝缘电阻在线测量在机场助航灯光系统中的实现

本文介绍了绝缘电阻在线测量在机场助航灯光系统中的实现方法。     

输变电设备在线监测及诊断技术的研究

为了对输变电设备故障进行正确诊断,对输变电设备状态在线监测系统进行研究和开发,建立了基于在线监测技术的输变电设备状态在线监测系统,并通过一年中的运行数据进行统计综合分析,详细介绍了利用在线监测的输变电设备故障诊断方法的操作流程和执行程序,体现了输变电设备状态在线监测系统的强大实用性。     

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.     

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.     

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.     

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