共查询到20条相似文献,搜索用时 62 毫秒
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顾元培何宁何志毅 《激光与光电子学进展》2013,(6):47-51
利用LED照明和通信的双重功能,研究了一种基于照明LED室外移动光通信的电子导览系统。分析了LED照明驱动和通信调制编码、室外光信道特性、移动电子导览系统原理,讨论LED脉冲调制与照明闪烁的关系,建立嵌入式环境下的可视化电子导览地图,以图、文、声方式提供移动轨迹导向服务,实现设定区域的自助电子导览的功能。结果表明,在保证室外LED正常照明的同时,可利用光照辐射区域实现景点位置信息传输,并完成对应景点信息的显示和播报,可靠实现了室外光接收目标移动路径的可视化导览,在短距离无线光通信应用中具有极大优势。 相似文献
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《电子技术与软件工程》2015,(16)
设计并实现了一个基于云平台、使用云端数据库的Android手机应用系统,利用百度地图提供的定位与操作功能,在手机上显示游客的位置及周边景点情况,播报景点介绍,展示景点图片,播放景点视频,为游客前往下一景点进行导航。与已有的手机导游软件相比,本系统对景区的基础设施没有要求,只要在移动通信和百度地图所覆盖的区域内,本系统都可以使用,且支持游客自主上传景点信息,具有互动性。测试结果表明,该系统已具备移动导游系统的主要功能。 相似文献
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提出了一种基于可见光通信技术的新型无线导览系统。在需要安装导览系统的地方对LED照明系统进行合适的改造,使LED发射带有识别码的可见光。当带有光电二极管的终端进入光照范围时,直接接受识别码,并经过跨阻放大器、滤波电路、电平判决器等电路处理后生成数字信号发送给后级微处理器,再通过解码、识别码比对等处理实现目标定位和无线导览的功能。利用FPGA开发套件及可见光发射机、接收机搭建了一个采用Manchester编解码和OOK调制方式的最简无线导览系统,并通过测试验证了系统的可行性。 相似文献
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文章以太阳能供电的LED照明系统为研究对象,探讨了其基本构成,重点探讨了太阳能充电控制器的设计及其电路实现。设计了以PWM控制器CS51221为控制核心的充电控制器的电路,探讨了相关元器件参数的计算方法:分析了LED照明驱动系统的组成及其功能,设计了以NCP3066为核心的LED驱动电路、光敏二极管开关电路、PWM波调光电路;完成了简易太阳能供电LED照明系统电路的硬件,并对其功能及工作性能参数进行了测试和分析。结果表明,该LED照明系统满足设计要求,系统运行良好。 相似文献
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设计了一套应用于宿舍、工作室及大型停车场的LED智能照明系统。利用9 V变压器与LM7805组成交流转直流5 V稳压源为系统供电,通过热释电红外探测器采集数据,无线模块实现全区域内的数据传输,采用大功率LED恒流驱动方案,并利用可调光芯片BP1360和先进的PWN技术对LED灯进行调光,同时利用脉宽调制技术控制舵机,使得LED灯在两个自由度(各180°)上自由旋转,自动锁定空间的5个位置实现照明,同时可以通过手动遥控器进一步对系统进行控制,自由选择照明方式,体现对LED灯的智能化和人性化,进一步实现绿色节能照明。 相似文献
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基于室内可见光照明的位置服务系统 总被引:7,自引:7,他引:0
设计并实现了一种基于室内LED照明光源的位置服务系统。系统利用LED标签(LED ID)技术,LED提供照明的同时广播自身的位置ID信息,移动终端将接收到的ID信息与位置关联,实现自身的被动定位。可见光通信的调制编码以及解调解码模块均采用单片机处理器(PC)实现,并提供UART接口分别与PC控制端和手机显示端进行通信。PC控制端向LED信号源发送位置服务信息,LED信号源通过空间光传输方式将自身位置ID和接收到的位置服务信息广播出去。手机使用终端加载有Android操作环境下的室内定位导航软件,可以实时更新位置和位置服务信息。 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
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
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Thomas M.Trexler 《半导体技术》2004,29(5)
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
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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
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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
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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
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
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
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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. 相似文献
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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. 相似文献
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《中国通信》2014,(7)
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 相似文献
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《中国通信》2014,(8)
正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first 相似文献