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1.
基于ZigBee技术实现了一种无线火灾监测系统。系统的火灾探测节点组成了一个ZigBee网络,实现了数据通信的无线化。在硬件方面,系统由ZigBee火灾探测网络、网关及监控中心组成。在软件方面,采用了基于浏览器/服务器(B/S)的整体结构,详细说明了无线火灾监测系统的Z-Stack协议栈软件开发、ZigBee无线通信流程等,介绍了基于Web的用户操作界面。与传统的有线火灾监测系统相比,基于ZigBee技术的无线火灾监测系统具有无需布线、结构简单、成本低、抗损毁能力强的优点。  相似文献   

2.
基于ZigBee技术的水质监测系统   总被引:1,自引:0,他引:1       下载免费PDF全文
程春荣  毛祥根  武利珍 《电子器件》2009,32(5):942-945,949
为了实现水质的实时监测,提出了一种基于ZigBee技术的多参数水质监测系统,并对系统的硬件和软件进行了详细的分析和设计。无线传输节点采用了TI公司的单芯片CC2430+低功耗功放CC2591解决方案,并修改和移植了ZigBee精简协议栈代码,再编写水质监测系统的应用程序和相关驱动程序。试验结果表明,该系统可扩展性强,节点功耗低,实时性能够满足水质监测系统的需求。  相似文献   

3.
岳红 《电子世界》2012,(20):117-117
针对当前粮情监测方面存在的问题,设计了基于ZigBee技术的粮库中央监测系统,采用传感器进行温湿度监测,采用无线通信进行数据传输,性能稳定,可靠性高,灵活性强,成本低,易于管理。  相似文献   

4.
基于ZigBee的船艇消防安全监测系统研究   总被引:2,自引:2,他引:0  
郑帅  周又玲 《现代电子技术》2010,33(11):129-130,134
基于ZigBee技术的船艇消防安全监测系统的设计方案,在成本低、易于实现的前提下实现对船艇各个舱室内部的消防安全监测。将ZigBee这种低功耗、高可靠性、可扩展性强的无线网络应用于消防安全监测,避免了各种现场布线,加强了系统的灵活性和可靠性,提高了船艇消防安全的监测能力。  相似文献   

5.
由于ZigBee无线通信技术具有低功耗、低成本、应用简单等特点,提出了基于ZigBee无线通信技术的矿井环境监测系统方案,采用在井下主巷道RS-485有线通信和采掘巷道ZigBee无线通信相结合的网络结构,ZigBee采用网型网络拓扑结构,井上部分上位机和井下监测节点采用标准的Modbus协议进行通信,上位机采用hbview进行数据接收、显示和存储。本文进行了监测节点的硬件设计,编程实现了监测系统ZigBee无线通信和ModbuS协议通信过程。测试结果显示,该系统能够准确可靠显示环境监测信息,证实了该方案可行。  相似文献   

6.
文章针对航材仓库具体物资的实时监测问题,设计了一种基于ZigBee的新型低功耗监测系统。该系统以ZigBee为传输模块,利用UTC系列无线模块与开关电路实现电源的低功耗设计。测试结果表明该系统工作稳定可靠,且具有功耗低,保密性好,抗干扰能力强等优点。  相似文献   

7.
《现代电子技术》2019,(5):95-99
针对传统杆塔倾斜监测系统存在自动化程度低、无法实现实时监测、有线网络成本高、难以拓展维护等弊端,结合电力系统的实际需求和ZigBee无线传感网络技术的优越性,设计了一种基于ZigBee技术和GPRS通信技术的低功耗、高精度的杆塔倾斜远程监控系统。分别从该系统的ZigBee通信模块、GPRS通信模块、电源模块和远程检测中心等模块的软、硬件设计对系统整体设计方案进行详细介绍。测试结果表明,系统运行顺畅,实现了被监测区域内的输电线路杆塔倾斜的实时、在线监测,实施性强,应用前景广阔。  相似文献   

8.
针对目前工业污水监测中数据采集难度大、实时性不强等问题,研究并设计了一种基于ZigBee无线传感器网络的污水远程监测系统。系统以ZigBee无线通讯技术为基础,搭建起无线通讯网络,实现了污水数据的自动采集及远距离传输。实验测试表明,系统传输速率快,实时性强,稳定性高,可以有效地对工业污水进行远程监测。  相似文献   

9.
基于ZigBee与红外的家居监控系统   总被引:2,自引:2,他引:0  
在介绍了ZigBee技术的兴起背景及优势的基础上,重点探讨了ZigBee无线技术在家居监控系统中的应用,并给出了一套基于ZigBee和红外技术的无线家居监控系统的设计方案。系统以CC2430为核心控制器并结合红外技术实现了对红外遥控型家电的兼容,能够监测家居环境并控制多种类型终端家电。测试表明:在250 m^2的房间里,该系统的ZigBee信号能有效覆盖。系统扩展性强,可靠性高,具有非常广阔的市场应用前景。  相似文献   

10.
文章采用ZigBee协议标准组织无线传感网,将CC2530作为ZigBee模块的硬件核心,用高精度数字式温度传感器DHT11进行温度采集,选用ARM芯片Intel Xscale pxa270作为上位机核心处理器,设计了实时、高效的小型无线温度监测系统。该系统结构完整,可扩展性强,与同类产品相比,性能更加稳定,使用更加灵活。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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