基于FBG柔性传感器的滑觉信号特性识别

针对目前为智能仿生体柔性皮肤领域提供支持的光纤布拉格光栅传感器研究对滑觉信号特性识别手段的不足,提出了一种通过人工学习网络对基于分布式光栅传感单元所检测的滑觉速度与滑觉载荷进行预测的方法。设计了由四支光栅构成的传感阵列,采用封装技术制成柔性传感器,并搭建实验平台对滑觉信号进行采集。给出了滑觉过程对布拉格光栅波长偏移曲线的作用原理,对经验模态分解与小波分析的去噪效果进行比较,信噪比分别达到15.99与16.15。搭建了滑觉实验系统,对采集的不同速度与载荷分度的滑觉信号的特征值设定提取标准,构建滑觉样本集,引入随机森林与神经网络两个回归模型进行训练,并对比了预测效果。实验结果指出,速度特性预测中,两种模型的R²系数分别为0.974 6和0.968 1,平均误差分别为5.22%和4.31%;载荷特性预测中,两种模型的R²系数分别为0.998 2和0.983 5,平均误差分别为1.12%和3.02%。该研究方法基本实现了对滑觉样本两种特征的准确识别,在柔性仿生皮肤传感领域对滑觉信号的研究具有一定价值。     

基于RBF神经网络的加速度传感器动态补偿研究

提出一种应用径向基函数(RBF)神经网络进行加速度传感器动态性能补偿方法.介绍动态补偿原理以及算法,并将其与BP神经网络法和系统辨识法进行比较.该方法利用加速度传感器的动态标定数据,采用RBF神经网络搜索和优化补偿模型参数.结果表明,这种补偿模型误差小,比用系统辨识法有良好的鲁棒性、能实现在线软补偿,比用BP神经网络有更快的训练速度.     

糖尿病合并慢性骨髓炎保肢治疗

触觉和滑觉检测是机器人实现物体抓取的关键环节,尤其是滑觉检测对实现软抓取尤为重要.该文设计了一种同时具有触觉和滑觉检测的新型触滑觉传感器.触觉检测基于聚偏氟乙烯(PVDF)膜的三向力传感技术,通过分析得到了计算空间三向力的公式;滑觉检测基于光电原理,将滑动引起的微小振动信号转化为光电信号.通过大量仿真试验得出了触觉、滑觉响应曲线,并确定了判定滑动信号的阈值.     

基于LabVIEW的PVDF压电薄膜触滑觉识别系统

利用聚偏二氟乙烯(PVDF)压电薄膜的柔性特点和压电敏感特性,设计并构建了基于LabVIEW的PVDF触滑觉识别系统,该系统由传感器,信号采集模块及LabVIEW信号处理显示3个模块组成。该文分别设计了触、滑觉传感器、信号调理电路及LabVIEW人机对话窗口,并进行了触、滑觉识别实验。实验结果表明,该系统能灵敏、准确的识别触觉和滑觉。     

基于神经网络的可调模型直接转矩控制速度辩识

在传统的模型参考自适应(MRAS)速度辨识模型的基础上,用神经网络理论对其可调模型进行了改进。并在无速度传感器直接转矩控制系统中对该速度辨识模型进行了研究,仿真结果验证了该速度辨识模型具有满意的辨识精度和动态性能。     

压电薄膜滑觉传感器的研制

本文提出一种能检测物体滑动的新型滑觉传感器,描述了该传感器的基本原理以及它的设计、制造和实验.结果表明利用该传感器探测滑动是可行的.     

谐振式声表面波加速度传感器特性研究

利用压电石英晶体设计并制作了一种谐振器型声表面波加速度传感器,并对其性能进行了测试和分析,特别是针对谐振式传感器的特点进行了动态性能的研究。有针对性地设计了频压转换电路,组建了动态测试系统,对该系统的适用性进行了分析和实验测试,结果表明该系统适合于待测试加速度传感器的动态性能测试,利用该系统对传感器的动态性能进行了实际测试。测试结果和进一步的理论分析表明,声表面波加速度传感器具有很高的灵敏度,其动态响应主要决定于机械结构,而与敏感机理关系不大。     

PVDF触滑觉传感器结构及其调理电路设计

应用聚偏二氟乙烯(PVDF)压电薄膜作为敏感材料,通过结构设计增加PVDF薄膜传感器的微振动信号响应,制作了新型触滑觉传感器。采用CA3140作为电荷放大器对PVDF压电薄膜传感器的电荷变化进行放大,再通过电压放大、工频陷波及低通滤波处理,调理分辨出直观的触觉信号和滑觉信号。测试结果通过示波器观察可明显分辨出触觉信号和滑觉信号。     

基于神经网络的传感器故障诊断方法研究

提出了一种收敛速度快、精度高、可靠性好的PRP（Polak-Ribi＆e—Polyak）网络训练方法,将该方法运用于Elman动态递归神经网络。对传感器量测信号进行预测和故障诊断。建立了传感器故障诊断网络模型,并以桌型舰栽平台发射装置为例进行了仿真实验,仿真结果表明：本文提出的Elman动态递归神经网络故障诊断方法有效性好,故障诊断率高。     

基于气体传感器阵列的电子鼻对混合气体定量识别的研究

阐述了电子鼻的结构,并根据传感器阵列响应信号特性,推导出气体传感器阵列的响应矩阵及其对混合气体的响应;论述了前馈神经网络在电子鼻中的应用原理。最后,利用自制的实验装置对所建立的电子鼻进行性能测试。实验结果证明气体传感器阵列和神经网络模式识别技术所组成的电子鼻完全可以完成对混合气体浓度的识别。     

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.