三轴加速度计在水下结构振动测试中的应用

采用基于MEMS技术的ADXL330三轴加速度计芯片,设计了适合水下结构振动测试的加速度传感器,并应用于某输水管线闸门振动监测系统中.分析了ADXL330结构、原理和标定方法.根据水下结构振动测试特点和要求,设计了应用电路、防水结构以及振动测试系统.现场应用表明,采用该芯片设计的三轴加速度传感器能够满足水下结构振动监测的需要,具有低成本、高精度、易安装和安全可靠等特点.     

三轴加速度计在水下结构振动测试中的应用

采用基于MEMS技术的ADXL330三轴加速度计芯片,设计了适合水下结构振动测试的加速度传感器,并应用于某输水管线闸门振动监测系统中。分析了ADXL330结构、原理和标定方法。根据水下结构振动测试特点和要求,设计了应用电路、防水结构以及振动测试系统。现场应用表明,采用该芯片设计的三轴加速度传感器能够满足水下结构振动监测的需要,具有低成本、高精度、易安装和安全可靠等特点。     

三轴加速度计在水下结构振动测试中的应用

采用基于MEMS技术的ADXL330三轴加速度计芯片，设计了适合水下结构振动测试的加速度传感器，并应用于某输水管线闸门振动监测系统中。分析了ADXL330结构、原理和标定方法。根据水下结构振动测试特点和要求，设计了应用电路、防水结构以及振动测试系统。现场应用表明，采用该芯片设计的三轴加速度传感器能够满足水下结构振动监测的需要，具有低成本、高精度、易安装和安全可靠等特点。     

单刀、六位RF开关达到四频段GSM手机要求

美国模拟器件公司（ADI）采用iMEMS技术推出了公司首个3轴加速度计产品——ADXL330。该款产品将MEMS传感器结构与信号调理电路集成在一起，功耗电流降低至200μA（20V电源电压条件下）。     

3轴MEMS加速度计建立超低功耗标准

美国模拟器件公司(ADI)采用iMEMS技术推出了公司首个3轴加速度计产品——ADXL330。该款产品将MEMS传感器结构与信号调理电路集成在一起,功耗电流降低至200μA(2．0V电源电压条件下)。     

加速度计ADXL105的性能测试

ADXL105在惯性导航系统中用以测量车辆的线加速度,再经过两次积分,得到车辆的位置信息.要进行精确定位,必须确保ADXL105的性能.本文就ADXL105的静态特性进行了测试,建立了表示车辆加速度及影响导航系统定位精度的主要误差的数学模型,并对模型的准确性进行了评价.     

ADXL346:三轴加速度计解决方案

EVAL-ADXL346Z是一款简单的分线板,支持将ADXL346轻松连接到现有系统中。ADXL346是一款数字输出型三轴加速度计,低功耗和多种内置特性使它适合各种应用。EVAL-ADXL346Z的尺寸很小,对系统和加速度计的性能影响极小,因此它适合在现有系统中评估ADXL346。     

基于加速度计的汽车动力学参数采集平台设计

为了方便采集汽车运动中的动力学数据,设计了一种基于加速度计ADXL330的汽车动力学参数采集平台。采用集成CAN协议模块的MC9S12DJ256单片机作为控制器,可以及时、准确地对汽车运动的相关信息进行数据采集、分析和计算。在此平台基础上进行二次开发,可应用于汽车自动变速器、汽车安全气囊（Airbag）、ABS防抱死刹车系统、电子稳定程序（ESP）等方面。     

ADI推出业界功耗最低的MEMS加速度计

ADI最近推出一款业界功耗最低的MEMS加速度计ADXL362。ADXL362是一款3轴数字MEMS加速度计,在运动检测唤醒模式下功耗仅为300nA,与最接近的竞争传感器相比,相同模式下的功耗低60％。在全速测量模式下,数据速率为100Hz时,ADXL362的功耗为2uA,比相同频率下工作的竞争MEMS加速度计低80％。极低的功耗使ADXL362可用于需要数月甚至数年电池寿命的应用,此类应用中更换电池可能不切实际或者对设备或操作人员有危险。     

加速度计ADXL105的性能测试

ADXL105在惯性导航系统中用以测量车辆的线加速度,再经过两次积分,得到车辆的位置信息。要进行精确定位,必须确保ADXL105的性能。本文就ADXL105的静态特性进行了测试,建立了表示车辆加速度及影响导航系统定位精度的主要误差的数学模型,并对模型的准确性进行了评价。     

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.