带有太阳能充电功能的蔬菜大棚温度检测装置研究

基于C51单片机和PT100温度检测技术,设计了一种带有太阳能充电功能的大棚温度自动检测装置。该装置由太阳能电池板、A/D转换器、蓄电池、单片机、温度检测电路等模块组成。通过PT100热电阻桥式测温电路,对大棚温度进行实时监测;利用单片机控制技术实现太阳能电池板和蓄电池之间的充放电管理;利用八位点阵终端显示实时温度值。通过实验验证装置性能稳定,运行良好。     

基于B/S模式的光伏中心数据采集系统的结构设计

基于B/S模式的光伏中心数据采集系统,通过采集和监测全国各地各类型光伏电站的运行情况,通过物联网传送到总检测控制室,并对各电站运行数据进行实时记录、存储和显示,生成各种报表图表,进而分析当地的太阳能资源和光伏发电情况、运行效率等,实现了对光伏电站的监管、评估,为优化管理提供有效依据.     

基于B/S模式的光伏中心现场数据采集系统

光伏中心现场数据采集系统用来获取光伏电站设备的实时运行数据,现场网络服务系统将获取的实时运行数据通过网络发送到光伏中心总检测控制室,光伏中心总检测控制室数据管理系统接收数据并将其保存入数据服务器中,这样总检测控制室数据库服务器中就存有各光伏电站的实时和历史运行数据,并能将这些运行数据以表格和图形曲线方式通过显示设备显示...     

基于DSP的卫星太阳能电池板姿态控制系统设计

卫星太阳能电池板将太阳能转换为电能,是卫星能源供应系统的重要组成部分。为了实现能源利用率的最大化,设计了基于DSP的太阳能电池板姿态控制系统。通过控制太阳能电池板姿态,太阳能电池板可以完成太阳光的最有效采集,提高太阳能电池板的光电转换效率。首先,依据太阳能电池板输出短路电流与太阳光照强度成正比这一原理,测量出太阳光相对于太阳能电池板的入射角;然后,利用DSP处理并生成电机控制信号;最后,驱动步进电机转过相应角度,完成姿态控制,从而使电池板达到最大采光率。测试结果表明,控制系统显著提高了太阳能电池板的采光率,性能稳定,为卫星能源利用率最大化提供了可靠保障。     

太阳能、市电互补LED路灯控制器研究

文章介绍了一种光电互补LED路灯控制器,该控制器控制太阳能电池板对蓄电池组充放电,实时检测蓄电池容量,并用光电互补方式对负载供电。同时阐述了太阳能LED路灯采用光电互补技术,既能提高可靠性,又能降低成本,是目前解决太阳能LED路灯照明的最佳选择,并根据LED路灯负载计算了蓄电池容量和太阳能电池板容量的匹配关系。     

一种新颖的太阳能追踪采集系统设计

采用MSP430超低功耗16位单片机作为控制核心设计了一种新颖的太阳能追踪采集系统,该系统对机械装置中水平、俯仰两个自由度的步进电机进行驱动,先是根据时钟时间调整硅电池板到预定位置,再根据检测的光照强度系列值,把太阳能电池板精确调整到光照最强处,提高了处理速度和追踪的精度,使系统更加稳定可靠。同时利用单片机的AD12模数转换器实时监测充电电池电量状态。另外,系统具有无线射频传输模块,可以把系统采集来的时钟时间、温度、光强、电量状态等信息传输到上位机,实现远距离实时监控。该系统经过实际应用检验,达到了设计要求,能够稳定可靠的运行,实现了太阳能自动追踪的控制。     

小型太阳能自动追踪系统研制

太阳能资源丰富,为了能高效地收集太阳能,文章设计了小型太阳能自动追踪系统,可以从4个方位检测阳光,并对其光心进行实时追踪,大大提高了能源利用率。该系统采用自动化控制,通过单片机控制步进电机转动来调整电池板角度实现对太阳能的全方位监控,从而有效提高太阳板的光电转化效率,实现太阳能利用最大化,解决了太阳能利用不充分的问题。     

太阳能自动跟踪系统的设计

为了更好的利用太阳能,自动跟踪系统越来越多的应用于太阳能行业中。基于可编程逻辑控制器(PLC)的太阳能电池板自动跟踪系统,包括硬件和软件两部分,其中硬件包括PLC输入输出端口、信号处理单元、驱动部分;软件包括PLC的控制和监控程序两部分。太阳能电池板自动跟踪系统使光伏电池板能实时跟踪太阳关照,从而最大限度的获得太阳能,有效地提高太阳能的利用率和光伏发电系统的效率,降低了光伏并网发电成本,具有理论研究意义和应用推广价值。     

光伏电站电气设备常见故障的解决方法

光伏电站的经济效益与电气设备的正常运行具有直接关系,要想充分利用太阳能,提升光伏电站的经济效益,必须要重视电气设备的运行与维护。文章围绕光伏电站电气设备的常见故障,探讨并分析解决故障的有效方法,提高光伏电站运行稳定性。     

倾角传感器在太阳能跟踪系统中的应用研究

太阳能以其普遍性、永久性、无污染、分布广、利用方便等优点成为各国竞相研究和开发的热点。对太阳能跟踪控制系统中的倾角传感器应用进行了研究,以检测太阳能电池板的倾角,使得太阳能电池板在俯仰方向上与太阳的高度保持一致。设计了倾角传感器检测电路,通过对倾角传感器输出数据的采集和滤波处理,滤除了太阳能电池板在转动过程中因抖动而产生的随机误差信号,实现了在俯仰方向上的精确测量。     

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.