HKA2910传感器信号调理芯片设计

阻性传感器固有的输出信号非线性和温度漂移的问题,使其在构建精密传感系统时影响系统的测量精度。通常情况采取板级补偿的方法,该方法占用板面积大、功耗大和质量大。通过研究阻性传感器的温度漂移产生原理和补偿方法,采用集成电路技术,单芯片实现了一种高精度传感器信号调理,内置高精度补偿算法,并开发了校准软件。对基于信号调理芯片构建的单片传感器信号调理 补偿系统进行系统测试,测试结果表明,在-55℃～150℃的温度范围内输出的信号呈良好的线性关系,误差小于0.2%,满足系统的测量精度需求。该芯片设计满足工程小型化、低功耗、高精度的要求,为信号调理补偿提供了新的技术手段。     

基于BP网络的高精度信号调理系统的研制

为提高压力传感器输出信号的调理精度,研制了基于BP神经网络的高精度智能信号调理系统.设计了基于MAXl452的信号调理电路、通信接口电路,完成硬件平台的搭建.选择BP神经网络算法作为传感器补偿算法,并编程实现.通过测试系统,验证了采用神经网络算法的可行性.     

量程可调的气压测试系统设计

在各种测量系统中,根据测量的预估值,选择不同的量程,测量的误差是不同的。设计了一种量程可调的气压测试系统,系统量程可根据测量预估值简单地进行调节,使得误差减到最小,测量精度得到提高。系统量程调节调理电路,采用了差分输入、同相放大、加法电路,其输出为0~5 V或4~20 mA标准信号,通过对信号调理电路中电位器阻值的调整,使得电压信号输出的输入范围为0~83.3 mV,电流信号输出的输入范围为0~117.1 mV。系统量程可以在此输入范围内任意改变大小,实验验证,根据测试的预估值,改变量程上限值,提高了气压测试系统的测量精度。     

基于自主传感器信号调理芯片温度补偿的软件设计

利用现代信号调理技术,以自主设计的信号调理芯片为核心,采用C#设计开发了硅压阻式传感器的智能误差补偿校准软件,实现了对核心补偿芯片的可视化操作与控制,解决了传统的硬件电路对压力传感器进行温度补偿的缺点。在多个温度点进行校准获取补偿曲线,得到零点及温度漂移补偿数据,解决了硅压阻式传感器一致性差、温度漂移和非线性等问题。系统运行结果表明:通过使用补偿软件,采用高精度温度补偿算法的传感器输出精度有了明显提高,在-55℃～125℃的温度范围内输出的信号与压力成良好的线性关系,压力参数测量精度达到了0.6%以内。     

压阻式压力传感器输出特性的补偿

在某型无人机高度传感器性能检测设备中,为解决压力的测量问题,设计了一种用于压阻式压力传感器(PRT)的信号调理电路,实现了对PRT传感器的零点输出、热零点漂移、满量程输出、热灵敏度漂移和满量程输出非线性等的高准确度校准和补偿。电路摒弃了以往传统的误差补偿形式,采用了一款新型信号调理芯片MAX1457,提出了软件补偿的方法,建立了误差校准补偿参数表,经过校准补偿传感器输出误差控制在了0.110%～0.158%。     

电容式微位移传感器设计及其应用研究

介绍了基于误差补偿的机器人系统原理,采用等电位环和驱动屏蔽电缆技术,设计了电容式微位移传感器及其信号调理电路。该电路包括改进型的电容运算放大器检测电路、精密全波整流电路和滤波电路等。试验结果表明:该电容式传感器的分辨力优于0.1μm,全量程非线性度小于0.2%;利用该电容式传感器测试偏摆误差,并进行偏摆误差补偿,机器人的性能得到提高。     

压阻式高温压力传感器温度补偿与信号调理设计与测试

设计制作了一种集成信号调理电路的高温压阻式压力传感器,包含倒装式的压敏敏片、无源电阻温度补偿电路和信号调理电路组成;压敏芯片的制作采用SOI材料和MEMS标准工艺,温度补偿和信号调理电路采用高温电子元件;试验表明,无源电阻温度补偿具有显著的效果;此外,采用了高温信号调理电路来提高传感器的输出灵敏度,通过温度补偿来降低输出灵敏度;与传统的经验算法相比,所提出的无源电阻温度补偿技术具有更小的温度漂移,在220℃条件下传感器输出灵敏度为4.93 mV/100 kPa,传感器灵敏度为总体测量精度为±2%FS;此外,由于柔性传感器的输出电压可调,因此不需要使用一般的电压转换器随动压力变送器,这大大降低了测试系统的成本,有望在恶劣环境下的压力测量中得到高度应用。     

多路硅压阻式压力传感器温度补偿系统的设计与实现

基于MAX1457实现了一种多路硅压阻式压力传感器温度补偿系统.MAX1457是一种专用传感器信号调理芯片.此芯片集成化程度较高,可以补偿硅压阻式压力传感器的温度误差和非线性误差.经调理后的综合误差不超过0.1%.在分析该芯片补偿原理的基础上,设计并实现了一种多路补偿系统.     

压力传感器温漂及非线性校准技术研究

高精度压力传感器是航空领域应用非常广泛的传感器,常处于严苛的工作环境.为使压力传感器在特殊的测试环境中保持高测量精度,传感器的性能设计成为研究关键.合理的信号调理电路以及正确的误差校准原理,将显著提高传感器性能.通过在传感器的信号调理电路中使用可编程模拟信号调节器,对桥式压力敏感元件的温度漂移误差及非线性误差进行实时修正,使压力传感器实现了智能化自校准,有效提升了压力传感器的精度和环境适应性.     

基于云计算的编码器信号误差补偿系统设计

传统的编码器信号误差补偿系统存在着补偿精度低的缺陷,为此提出基于云计算的编码器信号误差补偿系统。编码器信号误差补偿系统硬件设计包括编码器模拟控制单元、电源单元、信号采集单元与通信单元,软件设计包括通信模块、信号处理模块与信号误差补偿模块,通过编码器信号误差补偿系统硬件与软件的设计实现了编码器信号误差补偿系统的运行。通过实验得到,设计的编码器信号误差补偿系统补偿精度比传统系统高出30%,充分说明设计的编码器信号误差补偿系统具备极高的有效性。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。