基于物联网技术的电弧炉无线测温系统设计

针对目前钢铁厂温度采集系统对温度进行精准测量、多点采集和无线传输的需求,提出了基于物联网技术的电弧炉无线测温系统。系统以QRF0600无线射频收发模块和单片机Atmega128a、PIC16F648A为核心,采用单总线数字式温度传感器DS18B20进行准确测温,将采集的温度发送至温度监测仪进行温度实时显示,监测仪将收到的数据发送给上位机以实现数据的存储、查询、显示等功能。实践结果表明该系统具有测温节点功耗低、可靠性高、易于扩展、用户界面操作简单等优点。     

基于嵌入式系统的智能无线测温系统

为了适应现代工业现场温度采集系统能在各种现场环境下实现温度数据的测量传送,文中设计了一种基于ARM7微处理器核S3C4480和嵌入式实时操作系统μC/OS-Ⅱ的无线测温系统.该系统通过GPRS网络将采集到的温度数据发送给监控中心,实现了温度数据的无线采集和传送,满足了现代工业现场温度实时监控的要求.     

无线温度监测装置的设计

无线温度监测技术在环境保护、科学研究和现代工农业领域有着广泛的应用。针对某些特殊的测温环境,比如森林、油罐等,设计了一款无线温度监测装置,能够实时检测两路温度并无线传送到接收端显示。系统主要选用STC89C52单片机作为处理器、DS18B20作为温度传感器、n RF2401作为射频无线收发芯片、LCD1602作为液晶显示器。DS18B20采集节点温度,STC89C52处理温度数据后使用n RF2401无线发送,接收端接收数据并由LCD1602进行显示。该系统具有两路温度实时检测、操作简便、准确度高、价格便宜等特点。     

基于CC2430的农田无线测温节点的设计

本文从低功耗、小体积、使用简单等方面考虑,基于Zigbee技术的片上系统(SoC)CC2430和数字温度传感器DS18B20设计一个农田无线测温节点。无线节点工作在农田中的各个测温地点,进行温度数据采集和对数据的无线收发。本文以两节点间的数据传输为例对Zigbee技术在无线测温方面的应用作了介绍。     

基于安卓的无线车载温度控制系统设计和实现

系统设计了基于安卓和单片机的车载温度控制系统。系统包括控制终端、安卓上位机和一组测温节点。测温节点以MSP430F2132单片机为基础,利用温度传感器TMP275对温度信息进行采集,并通过Wi-Fi模块将数据传送给控制终端。控制终端以STM32F103ZET6单片机为基础,首先通过有人Wi-Fi模块USR-Wi-Fi232-S从多个测温节点获取温度数据反馈,采集实时的温度数值,但是获取的温度数据中存在错误的温度数据和低频噪声。控制终端需要通过数字滤波器将错误数据去除掉,以此来降低噪声的影响。然后,通过控制算法的控制,准确快速地驱动制冷装置,降低车内环境温度。安卓上位机利用GSM无线通信对控制终端的期望温度和时间进行设置,实现远程控制。该系统测量精度高,反应迅速,具有操作简单,功耗低等特点。     

基于ZigBee的健身数据无线采集系统

文中设计是基于Zig Bee无线传感器网络技术,面向健身俱乐部开发的健身数据无线采集系统。系统主要由佩戴于每个健身会员腕部的无线采集节点、数据采集汇聚节点、计算机等组成,通过人体随身携带的无线终端实时采集运动者的体温与脉搏数据,所有节点与汇聚节点共同组成一个无线传感器网络,汇聚节点与计算机通过串口进行通信,节点采集的参数通过汇聚节点实时传递到计算机上位机程序中。通过文中系统可以实现健身会员的信息管理及健身参数的实时采集,并根据记录数据进行运动效果评价。适用于无线数据采集、健身者运动量分析评价以及长期的健康监测。     

基于MSP430和VB的温度监测系统设计

针对目前集群现场测温中人工采集的一些局限性,提出了一种基于MSP430的多点测温系统的设计方案.设计了MSP430单片机驱动DS18B20采集温度的硬件系统和软件系统以及利用VB编写上位机接收显示界面,定时刷新采集到的实时温度,通过折线图显示出温度变化趋势.结果表明,该系统能够准确采集各监测点的温度数据,并可以实时召测当前温度,为工程应用提供了重要依据.     

基于CC2530的无线温度采集系统设计

针对传统温度采集系统存在的便携性差、准确率低、测温电路复杂等问题,文章提出了基于CC2530的无线温度采集系统设计方案。该方案选用ADT7301芯片作为温度采集模块,选用CC2530作为主控芯片实现模块控制、无线数据传输的功能。实验结果表明:该系统能够实现温度信息的实时采集和无线传输,具有体积小、精度高、易组装等优点。     

航站楼环境参数分布式监测系统设计

为监测航站楼内环境质量,设计了基于WIA-PA环境参数无线实时监测系统。该系统由多个检测节点组网,对航站楼室内各区域CO2浓度及温度进行采集。系统采用STM8作为检测器节点微控制器,通过变周期数据传输机制及WIA-PA协议将采集的航站楼各区域环境参数数据传输到上位机。上位机监测软件通过开辟多线程实现数据可视化显示。实验和应用结果表明,采用变周期数据传输模式,节点功耗可降低66.97%,网络平均丢包率为0.43%。系统功耗低,数据传输稳定。     

基于ZigBee的无线测温管理系统的应用研究

为及时测量变电站运行设备中大电流回路连接点发热的温度,设计出一种基于ZigBee技术的无线测温管理系统。详细阐述了无源传感器节点的工作原理和实现方案,给出了硬件电路设计和系统软件构成。通过可视化程序设计语言Visual Basic 6.0设计的监控界面,易于实现无线传感器网络温度信息的实时采集、及时报警和有效管理,做到设备发热实时监控及远距离遥测。     

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.