基于Python语言和sqlite数据库的试验数据备份整理系统

本文介绍了一个试验数据备份整理系统,描述了系统的原理,构成和用途。该系统主要用于电气试验数据的收集备份,也为进一步的整理和分析数据提供了方便。     

多波段拉曼-荧光激光雷达系统可用于雾霾探测

近日,兰州大学教授黄建平带领科研团队研制出我国首个多波段拉曼-荧光激光雷达系统。该系统不仅可用于大气雾霾探测的研究及预警,还可用于卫星数据校正、气象观测等领域。     

精确钢板测厚优化轧制模型控制的研究与应用

济钢中厚板厂精轧机钢板测厚自动控制系统是精轧机自控系统的一部分,是德国Thermo Radio meter RW GmbH公司的产品--λ射线测厚系统,用于在线测量、扫描,并对所得数据与该钢种的材质、成分综合分析,利用程序的曲线模型计算出理论数据作为反馈值送至精轧机二级系统.用于自动补偿,二级系统根据该数据计算出下一道的压下量等,从而为实现自动轧制提供了有力保障.     

高速采集系统的数据补偿和 422 串行接口的研制

本文介绍了用于激光三维图像数据采集系统中的硬件数据补偿电路和实现高速串行通讯的ＲＳ－４２２接口电路。     

线型压缩机驱动的微型同轴脉冲管制冷机长寿命试验研究

介绍了一种用于测试线形压缩机驱动的微型同轴脉冲管制冷机系统可靠性的试验系统，此试验台的建立将用来获得目前国内的同类系统的可靠性数据，为今后此种制冷系统用于军事实用打下基础。     

用于能耗监测系统的电力负荷数据集成传输技术

提出用于能耗监测系统的电力负荷数据集成传输的总体要求和系统架构。详细阐述了系统数据库、信息安全系统和应用功能模块的设计,并展示了相应的系统运行效果。     

纺织品光学性能检测系统多线程串口通信方法

结合纺织品光学性能检测系统的开发实践,提出了一种基于VC 多线程串口通信的实时数据采集系统的设计和实现方法.在主线程的基础上,创建了两个工作者线程,一个用于监视串口缓冲区数据,一个用于对从串口读取的数据进行处理,工作者线程通过自定义消息和主线程进行通信.对系统进行了不同类型光源和纺织品检测,实验结果表明,基于多线程串口通信技术的织品光学性能检测系统数据采集准确、可靠.     

捷联数字式航向系统校准方法

探讨一种能用于捷联数字式航向系统的实用校准方法及其校准数据的处理方法。     

基于ZigBee无线传感网的泥石流多发地数据采集系统

针对有线传感网数据采集系统布线成本高以及无法在环境恶劣的野外放置等问题,介绍一种基于ZigBee无线传感网的数据采集系统。该系统由基于MSP430单片机的主机、子机组成,子机由太阳能供电连接传感器,放置在户外采集数据,主机连接PC机放置在室内,主机和子机通过ZigBee无线网络通信。该系统实现了野外数据的采集和无线传输,具有实时性、稳定性等特点,可用于地质分析和泥石流预警等系统,以及各种无线传感网数据采集系统。     

间接测量函数的自适应建立方法

提出了一种用于间接测量系统的测量函数建立方法。它以n阶线性常系数微分方程的广义函数通解作为测量函数模型。根据系统的测量数据，从通解中自适应地确定与测量数据相吻合的测量函数表达式。并用一组数据建立的测量函数表达式证明，它是对测量数据更具有适应性的实用方法。     

A fast data acquisition system for PHA and MCS measurements

A microprocessor controlled data acquisition system for pulse height analysis and multichannel scaling is described. A 4K×24 bit static memory is used to obtain a fast data acquisition rate. The system can store 12 bit ADC or TDC data within 150 ns. Operating commands can be entered via a small keyboard or by a RS-232-C interface. An oscilloscope is used to display a spectrum. The display of a spectrum or the transmission of spectrum data to an external computer causes only a short interruption of a measurement in progress and is accomplished by using a DMA circuit. The program is writtenin Modular Pascal and is divided into 15 modules. These implement 9 parallel processes which are synchronized by using semaphores. Hardware interrupts from the data acquisition, DMA, keyboard and RS-232-C circuits are used to signal these processes.     

基于普通PC机和智能仪表的远程数据采集系统

介绍了以普通PC机和智能仪表为基础研制开发的一种低成本计量数据采集系统，详细阐述了数据采集的过程、系统的构成、功能和特点。     

A high-performance EIT system

This paper presents the development of a new electrical impedance tomography system for online measurement of two-phase flows with axial velocities up to 10 ms/sup -1/. The system is designed in a modular fashion and can consist of several data acquisition modules and computing modules. The data acquisition module includes a voltage controlled current source with a direct-current-restoration circuit, an equal-width pulse synthesizer unit and a synchronized digital demodulation unit. A new concept of current switching scheme is developed to enhance the ac coupling speed. The computing module includes a digital signal processor (TMS320C6202/6713) with memory, multichannel buffered serial ports and an IEEE1394 communication interface. Several DSP modules can be pipelined for a series of tasks ranging from measurement control to image reconstruction to flow velocity implementation. The performances have been tested and some trial results are reported. A data acquisition speed of 1164 dual-frames (2.383 million data points) per second has been achieved with a root mean square error less than 0.6% at 80 kHz in static test application. An application in the measurement of vertical oil-in-water pipe flow is reported.     

Bridge-to-computer data acquisition system with feedback nulling

A system is presented with which a computer can be used to provide electronic feedback nulling of a Wheatstone bridge measurement system used for data acquisition. This system provides compensation for drifts away from null resulting from the measurement setup or amplifier drifts with time or temperature. An example of the system in the case of a strain gauge bridge used with a cantilever beam is described     

A virtual instrumentation system for measurements on the tallest medieval bell tower in Europe

A complex virtual instrumentation-based system for measurements of mechanical and thermal parameters of an ancient masonry bell tower is described in this paper. The main focus is oriented toward the measurement issues and the data acquisition and on-line analysis system, which is entirely based on a virtual instrument approach. Choice of transducers and strategies of data acquisition, analyses, and storing are illustrated, and some of the results shown.     

高精度低温介质稳态质量流量、液位自动测量系统

介绍一种高精度低温介质稳态质量流量、液位自动测量系统,该系统包括液面计、密度计、二次仪表、采集系统、微机系统等,可通过计算机对低温介质贮箱中的液位进行实时监测,并能计算低温介质的稳态质量流量。该系统对液氧液位实时监测的精度可达到3％,对液氧稳态质量流量测量的精度可达到0．473％。     

激光跟踪仪角度采集系统设计及误差修正研究

高精度的角度采集和测量是激光跟踪仪实现跟踪和精密测量的关键。针对激光跟踪仪中采用的圆光栅编码器,本文介绍了一种基于FPGA的数据采集系统的设计与实现方法。该采集系统分为滤波、计数、通信三大模块。数字滤波模块用于消除跟踪控制过程中跟踪头振动、抖动产生的信号干扰;计数模块实现方波脉冲的倍频、辨向及计数;通信模块实现跨时钟域的数据传输。系统通过Modelsim仿真及实验测试验证了方法的可行性与可靠性。采用谐波分析方法对角度误差进行了修正,测量误差由3.5″降低到1.5″。本文设计的角度采集系统及谐波分析误差修正方法具有一定的通用性,可广泛应用于相关领域。     

Virtual instrument for instantaneous power measurements

A computer-based data acquisition system coupled by means of a general-purpose instrumentation bus (IEEE488/GPIB) with a digital oscilloscope is used to create a virtual instrument with instantaneous and average power measurement capability. The software signal-processing capability of the data acquisition system was used to compensate instrument measurement deficiencies and to enhance signal capture. The virtual instrument is shown to provide instantaneous, AC, and fitted-power averages and time-based plots of power variations for both linear and nonlinear system responses to external excitation. Data taken on a resistor, capacitors, an AC-to-DC power converter, and a bipolar junction transistor inverter establish a ±3% sensitivity with a 10-μW-100-W range over a 1-Hz-10-MHz frequency span     

紧凑式低温热交换器实验台测量系统

介绍了自行研制的紧凑式低温热交换器实验台的实时测量系统,包括温度、压力、流量测量三个方面.该系统基于计算机和力控组态软件,选用合适的传感器,采用A/D采集模块实现紧凑式低温热交换器实验台测试装置数据的实时显示和记录.测量系统具有操作简便、运行可靠等优点.用户界面具有强大的报表功能.该系统实现了低温测量和电量测量的有机结合,其经验可用于指导低温系统测量的数据采集.     

一种适用于现场原位校准的双输入激励方法

针对现场校准中各种非电物理量激励源实现困难的问题,提出一种双输入激励法,以电信号标准源激励校准传感器后面的数据采集系统。借助于现场物理量值提供单值激励,以现场测量标准校准包含传感器的被校测量系统,并判定传感器的工作正常性。在其工作正常情况下,以传感器稳定的传递特性模型的平移,表述其现实特性,模型参数来源于以往实验室校准结果,从而以双输入激励法完成全测量系统的现场校准。从铂电阻温度计长达6年的校准结果漂移特性,可以看出该方法具有正确性和可行性。