实验室在践行GJB9001B中的认识误区

该文简要介绍了通过ISO/IEC 17025《检测和校准实验室能力的通用要求》(CNAS-CL01《检测和校准实验室能力认可准则》的要求认可的检测、校准实验室,在践行GJB9001 B-2009《质量管理体系要求》中的几个认识误区和所走过的弯路,供实验室质量管理人员和审核员参考.     

30～1 000 MHz天线系数的校准

论述了30～1 000 MHz电磁兼容天线校准系统的建立和实际操作步骤,并给出了测试结果.通过试验,对双锥天线和对数周期天线进行了校准,其数据与原厂的校准数据非常接近,证明该校准系统完全符合天线校准的要求,并介绍了自动测试的方法.     

基于大规模天线系统的多通道校准算法研究

文章首先详细地给出大规模天线系统技术优势,并详细给出宽带信号多通道校准基本原理和步骤;然后提出一种新的应用于大规模天线系统的多通道算法,算法实现性能能够将多路待校准通道准确按照参考通道进行校准拟合,并满足系统对多通道幅相一致性的指标要求。实测数据分析表明:多通道校准校准结果可以满足时延、幅度和相位指标要求,保证大规模天线系统的波束赋形和空分复用性能最优。     

IEC 61000-4-2:2008静电放电模拟器校准方法的变化

针对IEC61000—4—2：2008中静电放电模拟器的校准参数、校准方法的变化,比较了其与2001版本的差别。阐明了2008版标准中用于校准静电放电模拟器脉冲参数的靶型适配器的结构、电参数的重大修改和严格技术要求。最后,详细介绍了靶型适配器的校准框图、校准设备和校准方法。     

闪烁测量仪的性能要求与校验方法

电压波动和闪烁测量是电子电器产品EMC测量和电能质量检测中的一个重要项目,但电压波动和闪烁测量仪的校验一直是一个难题,多数校准实验室并不具备相应的能力,行业中也普遍忽视该仪器的校准与验证。依据实验室量值溯源的要求,分析电压波动和闪烁测量项目中需要校准的参数及其准确度要求,介绍了电压波动和闪烁测量仪的校准方法,以及实验室如何进行验证的方法。     

ESD发生器开路电压和电流波形校准方法探讨

许多标准对系统级静电放电发生器的静电放电电流波形的校准设备和方法都有详细的要求,使得静电放电电流波形的校准有据可依,但国内外新老标准的要求不同,也会产生较大的误差。对于静电放电发生器的＂开路电压＂,所有标准中都有准确度的要求,但没有对设备和方法进行规定。而不同的校准方法,其测试结果的偏差很大。系统地分析了静电放电发生器＂开路电压＂和放电电流波形的校准方法。     

雷达网数据时间校准处理方法研究

数据的时间校准是雷达网系统数据处理的重要组成部分,成功的时间校准将能较大地提高雷达网数据融合的质量。针对数据时间校准的要求,结合雷达网数据校准过程,提出了雷达网系统时间校准的一般方法,给出了具体的实现过程,并通过仿真验证了该方法的有效性和实用性。     

频谱分析仪校准对信号源的要求

校准频谱分析仪通常要进行各种各样的测量,每一种测量都需要合适的输入信号。典型的校准过程一般采用一系列的信号发生器和其它设备来产生信号,并确保其准确度。本文主要介绍了频谱分析仪的校准,并讨论了最常见的校准测试及其对信号的要求,以及满足这些要求的方法。     

温湿度仪两点校准方法的研究与应用

随着车间现场环境温湿度控制水平的提高,对控制温湿度的测量仪表提出了更高要求.通过验证环境试验箱校准温湿度仪的适用性,研究温湿度仪两点校准方法的步骤,并通过测试结果验证其准确性.经车间现场校准与两点校准方法的比较,确认两点校准方法的实际效果更佳,使得在温湿度的校准方法和仪表准确性的判定上有了新的途径.     

基于GPS驯服铷钟的频率校准系统设计

定期对GNSS接收机的外部频率源进行校准是保证定位精度的重要措施.介绍了GPS驯服铷钟频率校准系统的工作原理和硬件组成,通过频率校准实验验证了该系统达到了较好的长期频率准确度和短期频率准确度指标要求,保证了被校准频率源的精确度.     

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.     

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.     

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.     

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