基于激光测量的高速非接触角度检测技术研究

提出了一种基于光学三角法测距原理的高速非接触光学角度测量方法,利用两个激光位移传感器测量物体具有角度变化时产生的位移,实时计算得到物体一维运动角度,在摇摆台上进行角度范围及精度的实验,并使用光纤陀螺进行角度实时同步测量,通过最小二乘拟合法对误差进行补偿。实验结果表明,该系统的角度测量范围±10°,角度测量精度±0.005°,测量频率2000 Hz。该角度测量技术使用非接触光学测量方法,对被测物体表面无损伤。     

基于SHT10的温湿度监测系统的设计

本温湿度监测系统以AT89C51为核心,以温湿度传感器SHT10作为测量元件,采集并实时显示传感器的测量数据,另外它还具有调节上下限并进行报警设置等功能。文章给出了硬件的设计过程和软件流程图,并进行了仿真,仿真结果表明,当温度变化范围为0~40℃,测量精度为±1℃;湿度变化范围为10%~100%RH,测量精度为±5%RH。该系统结构简单、携带方便、精度高,非常适合温室大棚及粮食存储等工厂企业应用。     

基于Android的便携式角度测量仪设计

针对现有角度测量仪,体积大、可操作性和便携性差、宽测量范围内精度低等问题,利用Android平台设计一款便携式角度测量仪,通过角度测量硬件电路、蓝牙电路和智能终端APP设计,实现从角度的采集、传输到显示、存储。该便携式角度测量仪结合智能手机和移动互联网,有效地提高测量的效率、只通过一台智能手机就可以完成角度的测量与监测,具有良好的可操作性及便携性。经实验验证,该测量仪测量范围为±90°,精度达到±0.1°。     

高精度袖珍温湿度测量仪

<正> 本文介绍一种高精度袖珍温湿度测量仪,温度测量范围为-20～+80℃,测温精度为±0.5℃;湿度测量范围为0～100％RH,湿度测量精度为±5％。它可广泛应用于图书馆、实验室、粮库、农作物大棚等需要随时采集温湿度的场所。 该仪器以AD7106(或AD7126)作为测量核心部分,采用40脚三位液晶显示器,并以9V叠层电池作供电电源。面板设置电源开关,温湿度选择开关。显示器显示的三位数,前两位为整数,后一位为小数。其主要电路原理图如附图所示。     

CMOS工艺兼容的温湿度传感器

设计并制备了一个CMOS工艺兼容的温湿度传感器,讨论了感湿理论模型并用COVENTOR软件进行了模拟,给出了具体的结构参数及工艺制作步骤,最后对温湿度传感器进行了测量,对理论值和实际测量值做了比较并给出了分析结果.结果表明,传感器在25℃时的灵敏度为0.015pF/%RH,从15%RH～95%RH,电容实际变化量为1.23pF.     

多点温湿度测量仪的设计

介绍了一种基于1-Wire总线的多点温度、湿度测量仪的设计方案,利用集成湿度传感器HiH3610测得相对湿度,由多功能芯片DS2438测得环境温度和湿度传感器输出的电压值,单片机对DS2438传来的各采集点数据进行处理和显示.该仪器测温范围和精度为:-40℃～80℃,精度:±0.5℃;湿度测量范围:0～100%RH,精度:±2%RH.     

基于单片机的无线仓储湿度检测系统设计

系统以单片机STC89C52RC作为控制处理核心,采用芯片nRF905为无线传输模块,HS1100/HS1101传感器采集湿度信号,设计了一种无线仓储湿度检测仪。经实验测试表明:系统湿度检测范围为10%RH~100%RH;精度达±1%RH,数据无线传输距离200米。设计的系统符合预期要求,可在仓储日常管理、气象、酒厂等不易布线,且需要实时监测湿度参数的场合推广应用。     

带扫描器的低频激光测振仪

本文论述一种测量低频正弦振动的振幅和标定低频振动加速度计的激光测振仪。该仪器具有对垂直振动台和水平振动台逐点扫描的性能。振幅测量范围为±30μ～±40mm,频率范围为0.1Hz～600Hz,测量精度为1％～0.1％。     

测量精度达2.6°的光外差干涉仪用动态相位计

结合用于磨床加工的光外差表面粗糙度在线干涉测量仪，文中介绍了高精度动态相位计的设计与实现。依据相位测量和整数周期计数相结合的原理，不仅提高了测量精度，而且将测量范围得以扩大；利用锁相环频率跟踪的特点，实现动态测量。在工作中心频率为２ＭＨｚ应用场合下，该相位计的测量精度达２．６°（相当于３．２ｎｍ），允许测量中最大多普勒频移±２０ｋＨｚ（对应高度的变化率±８．７５×１０＾－３／ｍｓ），完全满足磨床加     

面向RFID标签的COMS低功耗温度传感器设计

为了最大限度地提高无线射频识别（RFID）标签的操作距离,提出了一种集成于RFID标签芯片的超低功耗高精度CMOS温度传感器。传统的温度传感器主要采用带隙电路和ADC,而此类设计会消耗大量能量导致传感器功耗较高。提出传感器电路由新型数字环形振荡器,分频器,多路复用器和10位的数字计数器组成,温度转换成数字输出是在一个采样周期期间通获得过计数振荡器的时钟边缘数量得以实现。并且为了将温度灵敏度和动态范围最大化,使用的电源电压为0.3 v。振荡器的频率可以通过电容器组和堆叠晶体管进行数字修正。由于运用了阈值电压的温度依赖关系和MOS晶体管的载流子迁移率,因此与传统温度传感器相比,提出传感器的实现更加简单。通过0.18μm CMOS测试芯片获得的测量数据表明,提出的温度传感器分辨率为0.4°C/LSB,10位数字输出,校准后的可测量温度范围从-20°C到 95°C。采样频率为10Hz时,提出的传感器的功耗仅为92nW。     

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.     

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.     

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.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

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.     

Call for Papers

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