基于nRF24E1的多点无线温湿度测量系统

介绍了基于单片无线收发芯片nRF24E1的短距离无线多点温湿度测量系统的设计思想和实现过程.系统以嵌入51单片机内核的单片射频收发芯片nRF24E1为核心,采用数字式温度传感器DS18B20及模拟式湿度传感器HM1500,应用传感技术、无线收发技术及计算机技术,实现多点温度、湿度数据的采集和短距离无线传输.文章首先介绍了温度、湿度传感器及无线收发芯片的工作原理,然后详细阐述了系统的硬件电路结构和完成相关功能的软件设计方案.系统的结构简单、可靠性高、数据传输速度快,功能易扩展,适用于多种应用领域温、湿度的无线检测.     

基于nRF24E1无线传输的设计与应用

本文从应用的角度出发．介绍了一种基于单片无线收发芯片nRF24E1的设计与应用,详细描述了nRF24E1的硬件结构．并介绍了硬件电路的设计难点,同时对单片机软件编程的主要函数做了详细说明。     

基于RF微功率芯片的测温系统设计

详细阐述了利用无线收发芯片nRF24E1设计的数据传输系统的硬件和软件设计,给出了具体的实现方案。系统以嵌入51单片机内核的单片射频收发芯片nRF24E1为核心,将传感器采集的数据通过无线收发模块向手机传输,并在手机上正确的显示出来,供用户监控,从而在用户端能随时监控厂房的各种数据,减少布线的麻烦。     

Nordic VLSI推出nRF24E1和nRF24E2系统级芯片

NordicVLSI推出的两种系统级芯片-nRF24E1收发机和nRF24E2发射机,采用6x6mm的36引脚QFN封装,以市场主流的nRF2401/02RF芯片结构为基础,将射频、8051MCU、9通道12位ADC、外围元件、电感和滤波器全部集成到单芯片中,是全世界首次推出的、全球2.4GHz通用的、完整的低成本射频系统级芯片。适用于无线鼠标和键盘、无线免提装置、运动和休闲设备、玩具、无线频率识别(RF-ID)、遥控和工业传感器等多种应用。www.nvlsi.noNordic VLSI推出nRF24E1和nRF24E2系统级芯片…     

基于射频技术的人体生理数据采集系统设计与研究

对以nRF24E1射频芯片为核心的人体生理压力、温度、湿度参数的数据采集系统进行研究.为了精确测量人体的压力、温度、湿度系统精心设计了其数据采集部分的硬件电路,并且通过无线射频收发芯片对采集到的数据进行无线收发,避免信号线长距离传输容易产生的干扰.同时开发了相应的软件系统.     

基于RF芯片nRF24E1的多媒体教学用智能控制器的应用设计

计算机等智能设备在现代教育中使用非常频繁。但是由于在教学中需要频繁的操作计算机,教师只能坐在计算机面前。为了让教师在任意走动时也能方便的操作计算机,可以设计一种无线智能控制器。系统级RF收发芯片nRF24E1以其优异的通信性能成为了智能控制设计的首选。文章从nRF24E1的功能模块和特性出发,给出了在多媒体教学中对计算机的智能无线控制的实现原理,并最终详细阐述了应用的软硬件设计思路。     

基于nRF24E1与网络、火线的教室照明射频遥控设计

目前多媒体教室照明如何实现远程控制,是值得进一步研究的课题。阐述了射频收发芯片nRF24E1的基本特性,并以nRF24E1为主体实现了符合IEEE 802.3af标准的基于网络受电设备射频收发遥控主机,符合电工安全规范的基于火线单线制射频收发遥控从机。分析了射频遥控收发非标准协议数据通信和软件设计流程,并论述了该系统在实际应用中的优势。     

几种内嵌8051无线SoC芯片的应用比较与选择

比较了CC1010、nRF9E5和nRF24E1三款无线SoC芯片的主要特性，介绍并分析了它们的结构、原理和典型应用电路。     

2.4GHz射频收发芯片nRF24LE1及其应用

nRF24LE1是集成2.4GHz无线收发器、增强型8051、ADC和其它外设的一款高集成度无线收发芯片,它体积小,功耗低、设计所需外围元件少,有很大的价格优势。介绍了nRF24LE1的内部结构、引脚功能、工作模式、发送与接收的工作流程,给出了应用电路图,最后与蓝牙对比对全文进行了总结。     

异步电动机转速无线数字控制系统设计

针对异步电动机转速的无线控制,给出了选用可编程nRF24E1无线收发芯片,并通过软件设计来节约硬件资源,提高可靠性的新型数字式变频调速系统的设计方法。该方法利用智能功率模块（IPM）提高了变频调速电路逆变器系统的抗干扰性能和可靠性。     

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.