泛华测控传感器再添角位移传感器测试系统

2009年2月,北京中科泛华测控推出了新品—角位移传感器测试系统。该系统主要用于磁感式角位移传感器的校准和终检测试。角位移传感器测试系统可在稳定的环境温度范围内,采用通讯方式获取DUT原始数据,并对DUT进行校准和编程,最后测量DUT的输出信号进行验证测试。     

泛华测控传感器测试系统再添新品——角位移传感器测试系统

2009年2月,北京中科泛华测控技术有限公司在深耕传感器测试领域又推出了新品——角位移传感器测试系统。该系统主要用于磁感式角位移传感器的校准和终检测试。角位移传感器测试系统可在稳定的环境温度范围内,采用通讯方式获取DUT原始数据,并对DUT进行校准和编程,最后测量DUT的输出信号进行验证测试。     

基于光纤陀螺的通用角位移反馈控制传感器

提出一种基于光纤陀螺的通用角位移反馈控制传感器,该传感器能够同时实现角位移测量和反馈控制的功能。利用该新型传感器在坦克车长周视镜上进行了稳定控制实验,结果表明系统可以实时响应外界扰动并能快速、无超调地回到初始位置,实用性强。     

光电侦查平台中电容式角位传感器的应用

机载光电侦查平台对于内俯仰框架、内方位的旋转角度的测量具有很高的要求,传统的传感器已经日益难以满足侦查平台的需求,此时将高精度的电容式角位传感器应用到光电侦查平台上,实现角位移精确的测量就成为了光电侦察平台发展的重中之重。文章建立了基于偏心原理的高精度角位移测量方法,并根据此原理设计了一套实验装置,实验结果表明该设计方法测量的角度值和距离具有良好的线性度。     

角位移传感器在麦尔兹窑料位控制系统中的应用

本文介绍了角位移传感器的原理、特性及应用情况,着重描述了麦尔兹窑料位控制系统使用角位移传感器的料位控制原理、料位校准的方法以及在长期使用过程出现的故障,对故障进行分析,提出改进方法,落实改进措施,并取得了一定的成效.在麦尔兹窑料位控制系统中,使用角位移传感器,结合液压传动技术、PLC程序计算、联锁控制和HMI人机界面的人性化处理,能够达到信号稳定、测量准确、安全可靠的目的.     

角位移感应的扩充应用

正应用工程师总是在寻找能提升效率和降低设计挑战的方法。角位移传感器因为能应对这些条件而变得越来越受欢迎。人们想知道,到底什么是角位移感应。角位移感应测量的是物体围绕中心轴旋转的角度。同任何一种传感器一样,其用途都是将物理和机械信号转变成计算机和其他设备理解、修改和使用的数据。在一些情况下,一些物理参数     

正余弦旋转变压器与线性旋转变压器的对比分析

控制系统中多采用角位移传感器获取控制部件的角位移信息。正余弦旋转变压器式角位移传感器和线性旋转变压器式角位移传感器是两种常用的角位移变压器。介绍了两种变压器的工作原理及特点,在此基础上给出了两种变压器的解调方法,并得出了平方和监控及和值监控的方法。通过两种角位移变压器的对比分析,有助于两种角位移变压器在工程应用中的合理选型及正确使用。     

一种新型变面积电容式角度传感器的设计

介绍了一种电容极板固定于同一平面的变面积电容原理的非接触式角度传感器.传感器借助于多相激励信号源在极板上产生平面位置信号,通过过渡极板耦合形成对应于角位移信号的合成电场,利用合成信号与基准信号鉴相比较实现以角位移信号的测量.通过模型仿真和样品试验,验证了原理设计的可行性,并在误差分析基础上给出了减小误差的方法.传感器具有固定侧出线、低成本和测量区域及性能可拓展等特点.     

一种基于平板横向剪切干涉的角位移测量方法

在一种已有的角位移干涉测量技术的基础上,提出一种改进的角位移测量方法.通过选择合适的初始入射角,使从平板前后表面反射的两光束实现剪切干涉.采用一维位置探测器测量光束经透镜会聚后在探测器光敏面上的光点偏移量.根据干涉信号的相位和光点偏移量可以计算出被测物体的角位移.在该测量方案中,引入的一平面反射镜与被测物体的反射面形成光程差放大系统,提高了角位移测量灵敏度.分析了初始入射角对剪切比的影响,并讨论了基于该方案的角位移测量精度.实验结果表明,基于该技术的角位移重复测量精度达到10-8rad数量级.     

自动二维天线测试转台的设计

从相阵天线电性能测量的需要出发,运用高精度的角位移传感器,配以合理的机械结构形式,使得相阵天线实现了较高精度的自动测量。     

一种芯片内部稳压电源的实现

介绍和分析了一种用于PWM控制器内部的稳压电路,采用双极线路结构和4μm工艺。经过PSPICE仿真,它具有0．176mV／V的稳压系数和60dB的纹波抑制比和较低温度系数。     

一年之间，物换星移

去年的这个时候,供货商们还在为生存而挣扎。如今,2009年的年报已经公布,许多供应商的年报业绩之好,就连最乐观的分析师也始料未及。这种变化的原因很简单：供应商们大幅削减成本,接下来是强劲的需求,这又导致了随后高企的设备利用率。     

Building a in a flash supercomputer

A flash mob is a group of strangers, organized over the Internet, that comes together briefly, acts out a predetermined scenario-often something as simple as clapping for 30 seconds-and then disperses. A supercomputer is a very fast and powerful computer that outperforms most mainframes, at a cost, typically, of millions of dollars. Can a flash mob build a supercomputer? It can sure try, and so it did on 3 April at the University of San Francisco's Koret athletic center. The goal was to run the Linpack benchmark, a standard method of assessing the speed of supercomputers, to achieve a speed of at least 403 gigaflops (billion floating point operations per second). This would be fast enough to earn the system a place on the list of the world's fastest 500 supercomputers. The goal was not reached. The group reached just 180 gigaflops before it was time to pack up the computers and go home. However, even though the San Francisco effort fell short of speed goal, it did ignite imaginations.     

On a wing and a prayer

Aircraft giants Boeing and Airbus are pinning their hopes on very different visions of how air travel will evolve in the coming decade.     

Converting a Display Screen into a Touchscreen

A method is presented to convert any display screen into a touchscreen by using a pair of cameras. Most state of art touchscreens make use of special touch-sensitive hardware or depend on infrared sensors in various configurations. We describe a novel computer-vision-based method that can robustly identify fingertips and detect touch with a precision of a few millimeters above the screen. In our system, the two cameras capture the display screen image simultaneously. Users can interact with a computer by the fingertip on the display screen. We have two important contributions: first, we develop a simple and robust hand detection method based on predicted images. Second, we determine whether a physical touch takes places by the homography of the two cameras. In this system, the appearance of the display screen in camera images is inherently predictable from the computer output images. Therefore, we can compute the predicted images and extract human hand precisely by simply subtracting the predicted images from captured images.     

Cooperative control of a human and a robot manipulator for positioning a cart on a frictionless plane

Robots may be expected to execute some tasks in cooperation with humans. Control systems for such robots should be appropriate to adapt to human characteristics in order to successfully accomplish the task. Pushing a cart on a frictionless plane in cooperation with a human is a basic example to such a task. To control the motion of an object from one point to another on a frictionless plane is impossible by only pushing in one direction without supporting it in the opposite direction, since as soon as the force is applied, the object will move without stopping its motion. In this paper, compliant cooperative positioning of a cart on a frictionless plane by a human and a manipulator is proposed using impedance control method with the parameters obtained from human–human cooperation.     

利用悬臂梁将均匀周期光纤光栅变为啁啾光纤光栅

利用均质、等厚及等腰梯形的悬臂梁,对刚性粘贴其表面的光纤光栅的布喇格反射中心波长在1557．68～1564．2nm范围内进行了线性调谐,同时带宽为外0.52nm的均匀周期的光纤光栅被调谐成带宽为2．52nm的啁啾光栅,且啁啾量可调。随着带宽的增加,反射谱的峰值功率呈减弱的趋势。     

Analysis of a coaxial-to-waveguide adaptor including a discendedprobe and a tuning post

A field matching analysis of a coaxial-to-waveguide adaptor incorporating a disc-ended probe and a tuning post is presented. In this analysis, the tuning post is considered as a short-circuited second probe. A computer algorithm for calculating the input impedance of this structure is developed. This algorithm is used to investigate and improve the operation of a commercially available coaxial-to-waveguide adaptor