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.     

ADXL357加速度计原理及其在超声测井仪器中的应用

本文应用ADXL357传感器实现三轴加速度的测量,详细介绍加速度计的特点与工作原理,并在超声成像仪数据采集与处理电路中应用该传感器。通过平台测试,结果表明该芯片在高温下温漂特性较好,工作稳定性较高,为声波测井的井下加速度测量提供了有益的参考。     

风力发电机振动采集系统的设计

针对振动分析在风力发电机状态检测及故障定位中的作用,设计了基于ADXL335三轴加速度传感器的振动采集系统,并通过STM32实现模数转换。对信号采集过程中出现的频率混叠,设计了六阶巴特沃斯低通滤波器,采用Savitzky-Golay平滑算法对信号中掺杂的噪声进行去噪。测试结果表明：所设计滤波器可有效滤除600Hz以上的信号,振动加速度的误差可控制在0.5%以内;Savitzky-Golay平滑算法可有效消除信号中的噪声。     

三轴加速度计ADXL330的特点及其应用

ADXL330是美国模拟器件公司推出的完整的三轴加速度计,可以静态或者动态测量物体的加速度,测量范围是±2g.介绍了ADXL330的主要特点及其在组合导航系统中的应用.     

基于SOI的集成硅微传感器芯片的制作

为满足小体积、多参数测量的要求,采用SOI硅片,设计了一种测量三轴加速度、绝对压力、温度参数的单片集成硅微传感器,其中加速度、绝对压力传感器基于掺杂硅压阻效应,温度传感器基于掺杂硅电阻温度效应.根据集成传感器的结构,制定了相应的制备工艺步骤.针对芯片上各电阻间金属引线的可靠性问题和加速度传感器质量块吸附问题提出了有效的改进方法.最后给出了集成传感器芯片的性能测试结果.     

士兰微电子再创MEMS传感器新品

士兰微电子早在三年前开始进行MEMS传感器技术和产品的研发,并在MEMS传感器件的设计、信号处理芯片的设计、MEMS芯片工艺制造技术、MEMS封装技术、传感器测试技术等领域投入了全方位的研发资源,并于近期取得实质性进展,推出了三轴加速度传感器SC7A30和三轴磁传感器SC7M30。     

ADXL105加速度传感器在车辆平顺性测试中的应用

介绍了加速度传感器ADXL105的特点和工作原理，结合汽车平顺性测试的要求，给出了汽车平顺性测试电路的具体设计和必要的性能测试方法。[编者按]     

基于SOI的集成硅微传感器芯片的制作

为满足小体积、多参数测量的要求,采用SOI硅片,设计了一种测量三轴加速度、绝对压力、温度参数的单片集成硅微传感器,其中加速度、绝对压力传感器基于掺杂硅压阻效应,温度传感器基于掺杂硅电阻温度效应.根据集成传感器的结构,制定了相应的制备工艺步骤.针对芯片上各电阻间金属引线的可靠性问题和加速度传感器质量块吸附问题提出了有效的改进方法.最后给出了集成传感器芯片的性能测试结果.     

基于MEMS技术的水平轴光纤加速度传感器

提出了一种基于微机电系统(MEMS)技术的水平轴光纤加速度传感器,并与Z轴光纤加速度传感器在同一MEMS芯片上制造,形成单一方向出纤的三轴光纤加速度传感器。分析了器件工作原理和器件结构参数与其性能的关系,利用MEMS技术成功制作出了加速度传感器样品。初步测试结果表明,本光纤加速度传感器灵敏度为164mV/g,3dB带宽的截止频率为1 600Hz。     

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.