环境噪声检测终端设计

针对环境噪声监测中多点声级数据采集以及实时传送的要求,提出了基于分组无线业务（GPRS）的新型环境噪声监测系统,实现环境声级数据的远程、快捷及低成本传输。给出了整体设计方案和原理框图。从硬件和软件设计两方面对监测终端的设计做了详细的说明。监测终端将噪声数据及时、准确地通过GPRS网络传给环境监督管理部门。为环境噪声监测和治理提供有效的依据,同时对推动环保领域的技术进步和科技发展具有十分重要的现实意义。     

基于CDMA网络的噪声监测技术研究

按照我国在环境噪声测量方面的标准及相关测量方法,提出一种基于CDMA1X无线网络的环境噪声监测终端的设计,实现对环境噪声的远程实时监测、历史数据查看、超标报警及现场存储等多项功能。介绍了系统的架构、硬件组成原理和软件设计方案,对关键的硬件组成部分、软件分层模块及数据处理方法作了阐述。结合实时数据和图表对终端试运行的情况进行了说明。     

无线传感网络在三峡库区滑坡监测中的应用

将无线传感网络(WSN)结合Internet的网络构建方案,利用MSP430F149和CC2430设计传感器节点,结合GPRS网络,实现对数据的采集和无线传输,并通过控制中心建立起完整的监测系统以实现对库区滑坡参数远程无线监测。系统具有低功耗、低成本、高可靠性等特点,是一种比较理想的实时在线远程监测系统,为滑坡监测提出了一种新的思路。     

基于AD7712的高精度数据采集系统的设计与实现

AD7712是美国AD公司推出的低成本24位模数转换芯片,采用Σ-Δ技术,受环境噪声的影响比较小。结合当前实时数据采集系统要求精度髙的问题,提出了一种基于AD7712的高精度实时数据采集系统的设计及具体实现方法。根据系统设计要求,详细给出了硬件电路的设计和软件流程,并应用于现场测试得出结果,证明该数据采集系统完全满足高精度的要求。     

基于ZigBee无线传感网络监测系统的实现

为实现环境的智能化实时监测,提出基于ZigBee的无线传感网络技术的环境监测方法。利用ZigBee的低成本、大规模自组织网络、监测节点能长时间生存等优点以满足智能化实时监测的需求。文中实现了整个无线传感网络的系统软硬件架构以及环境监测数据的采集、发送、处理。实验结果表明该系统性能稳定,实时性好,能较好满足实际监测需求。     

用于轨道交通屏蔽门的分布式监控组态系统的研究

本文提出了基于分布式模块化监控组态方案的轨道交通屏蔽门监控系统.引入监控组态和仿真技术对站台前端门控设备进行实时监测、参数批量配置和远程指令控制,上位机和下位机之间采用MODBUS TCP/IP协议进行通信.实际应用证明:该系统可有效实现对地铁屏蔽门运行状态的仿真监控、故障诊断及维护管理.     

基于分布式组件的监测网络系统的设计与实现

随着监测技术向自动化、智能化、网络化的不断发展,对监测系统提出了更高的要求。为了提高系统响应性能和稳定性,增强应用程序的可维护性和可扩展性,提出了一种基于分布式组件技术和模块化思想的监测网络系统的设计和实现方案。该系统实现了对数据的实时监测和非实时监测功能,并在全国短波监测网络系统中得到应用。     

基于GSM的智能温室监控系统

为了提高温室内实时信息的有效监测与控制,设计了基于GSM的智能温室监控系统,系统以STC89C58单片机为核心,控制GSM短信模块以及外围传感器等,实现了温室信息实时有效的检测与传送功能,硬件部分包括了数据采集、短信收发、用户界面以及执行系统四部分。软件部分实现了温室数据的智能检测、控制及通过短信有效实现用户远程控制的效果,为温室信息监测提出了一种有效的解决方案。     

基于物联网技术的大气环境监测系统研究

大气环境监测系统监测的数据在气象预报等服务中具有权威性、法律性,同时保证服务的精细化以及人性化,并将准确的预报应用到生产生活等各项领域中,实现了社会的可持续发展。为了满足大气环境监测系统实时性、可靠性、实用性的要求,提出了利用Zigbee技术以及3G技术实现对大气环境信息实时监测的方案,着重讨论了传感器节点的设计,处理器选择超低功耗的CC2530芯片,设计了数据采集部分的硬件电路,并介绍了系统的软件实现方法。真正实现了大气环境监测的智能化、高效化和网络化。     

智能安全工具柜实时监控系统的设计与实现分析

安全工具柜是一个能够为绝缘工具提供适宜存放环境的装置,其内部能够保证干燥,符合国家对绝缘工具存放的要求.针对当前供电企业在电力工具管理方面存在的漏洞,采用ZigBee无线网络工具柜的实时监测系统设计方案能够有效解决这一问题.此系统主要由远程操作中心和无线网络构成,可以实时监测工具柜内部的温度、湿度等参数,通过远程中心管理用户的信息.此次研究介绍了ZigBee无线网络工具柜的系统总体构架、上下机位系统设计方案以及系统测试结果.该系统目前具有低功耗和低成本的主要优点,并且扩展功能优秀,应用能力较强.     

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.