基于DSP的加速度传感器测试平台控制系统设计

针对现有加速度传感器静动态标定测试耗时多、效率低、成本高以及标定校准能力有限的问题,设计了加速度传感器批量测试平台。通过DSP对电机和自动锁紧装置的控制,以及倾角传感器的数据采集和限位开关的检测,对测试平台装置进行控制操作。系统设计有上位机软件,能够通过计算机上的上位机软件向控制系统发出控制指令,实现测试平台的控制,达到了加速度传感器的静动态性能测试。     

基于FPGA的数据采集系统设计与实现

设计并实现了一种基于FPGA的高速数据采集系统,后端系统用于采集目标ADC芯片的数字输出,将采集后的数据传输至PC机再进行分析。数据采集系统采用DDR2 SDRAM存储、千兆以太网(Gigabit Ethernet,GE)传输设计,在Altera Stratix III FPGA平台上进行了测试与应用,最终成功采集1GByte的数据,连续没有数据丢失。     

批量化微加速度计综合测试平台设计

为了实现微加速度传感器批量标定的测试,能够更加方便地进行多个传感器的性能测试。基于SolidWorks软件平台设计了一种可一次进行多只传感器综合测试装置。该装置可分别进行翻转测试和振动测试,并且能够实现传感器测试夹具与测试平台的自动结合与分离。通过对用该装置测试的加速度计参数和原厂标定的加速度计参数对比表明,该测试平台的测试结果可靠。     

CMOS图像传感器的图像采集系统的研究与实现

研究一种基于USB2D的CMOS图像传感器的图像采集系统的实现方案.以xilinx公司的FPGA芯片为核心控制芯片,Cypress公司的CY7C68013为USBZ0接口芯片.主要介绍了CMOS图像传感器外围电路设计、FPGA芯片与CMOS图像传感器接口电路设计、FPGA芯片与USB模块的接口电路设计.所设计的采集系统功耗低、成本低、可扩展性强.     

基于FPGA的多通道信号采集系统设计

设计了一种基于Altera Cyclone IV系列FPGA的128通道数据采集及传输方案,使用FPGA作为16个AD芯片的采集控制和数据缓冲并以GMII接口方式连接到以太网芯片,使用Marvell公司的千兆以太网芯片88E1111作为上位机与下位机之间数据传输的桥梁,在数据传输速度上比采用传统的芯片有了飞跃。该设计对数据传输与并行处理完全可以满足系统的实时性要求。     

基于ARM和FPGA的微加速度计数据采集系统设计

基于常用的MEMS惯性器件微型加速度计,介绍一种采用ARM和FPGA架构来采集加速度数值的设计方案,微加速度计的模拟输出信号经A／D芯片转换后由FPGA进行处理和缓存,然后ARM接收FPGA的输出数据并对数据进行显示和存储,对如何用FPGA实现该数据采集系统的传输控制和数据缓存,以及FPGA与A／D转换芯片和ARM的接口设计给出了说明,实现了加速度数值的采集、传输、显示和存储,该方法配置灵活、通用性强,可以较好地移植到相关器件的数据采集系统中。     

基于SOPC技术的芯片批量测试板设计与实现

为提高SoC芯片测试板效率及稳定性,考虑芯片测试需求和设计模块化等因素,采用可编程片上系统和上位机配置技术,充分利用FPGA开发板上的HSTC扩展接口,设计了一款面向多芯片同步测试的批量测试板,有效解决了芯片批量测试中的难题,实现效率与性能的双优。主要阐述了该测试板的上位机控制方法、嵌入式控制系统的功能组成以及片上测试程序的设计流程。     

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。     

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.     

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.     

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.     

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.     

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.     

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.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.