High-SpeedReal-TimeDataAcquisitionSystem Realized by Interleaving/Multiplexing Technique

The interleaving/multiplexing technique was used to realize a 200?MHz real time data acquisition system. Two 100?MHz ADC modules worked parallelly and every ADC plays out data in ping pang fashion. The design improved the system conversion rata to 200?MHz and reduced the speed of data transporting and storing to 50?MHz. The high speed HDPLD and ECL logic parts were used to control system timing and the memory address. The multi layer print board and the shield were used to decrease interference produced by the high speed circuit. The system timing was designed carefully. The interleaving/multiplexing technique could improve the system conversion rata greatly while reducing the speed of external digital interfaces greatly. The design resolved the difficulties in high speed system effectively. The experiment proved the data acquisition system is stable and accurate.

Alternate Data Acquisition and Real-time Monitoring System on HT-7 Tokamak

A new system called alternate data acquisition and real-time monitoring system has been developed for long-time discharge in tokamak operation. It can support continuous on-line data acquisition at a high sampling rate and a graphic display of the plasma parameters during the discharge. Thus operators can monitor and control the plasma state in real time. An application of this system has been demonstrated on the HT-7 tokamak.

A multi-sensor-based distributed real-time measurement system for glacier deformation

Glacier disasters occur frequently in alpine regions around the world,but the current conventional geological disaster measurement technology cannot be directly used for glacier disaster measurement.Hence,in this study,a distributed multi-sensor measurement system for glacier deformation was established by integrating piezoelectric sensing,coded sensing,attitude sensing technology and wireless communication technology.The traditional Modbus protocol was optimized to solve the problem of data identification confusion of different acquisition nodes.Through indoor wireless transmission,adaptive performance analysis,error measurement experiment and landslide simulation experiment,the performance of the measurement system was analyzed and evaluated.Using unmanned aerial vehicle technology,the reliability and effectiveness of the measurement system were verified on the site of Galongla glacier in southeastern Tibet,China.The results show that the mean absolute percentage errors were only 1.13%and 2.09%for the displacement and temperature,respectively.The distributed glacier deformation real-time measurement system provides a new means for the assessment of the development process of glacier disasters and disaster prevention and mitigation.

MEASUREMENT TECHNOLOGY OF HEAT AND COOL

The popularization of large scale central air conditioning system (CACS) has brought forward a new pro blem,i.e. how to measure the cooling and heating quantum accurately. This problem will directly affect the qua lity of modern property management. So the study on the technology of measuring heat and cool is very necessary. In this paper, the detailed thermal analysis and the mathematical model of relative parameters that affect the measurement of heat and cool are discussed. A sample instrument based on the model is made, After the trial use by several customers, the device is proved to be practical, worthwhile and of good capacity.

基于．NET及Measurement Studio的USB型测试系统研制

介绍了一种基于．NET框架环境及Measurement Studio．NET的USB接口型通用多路高速并行采集测试分析系统的开发,以及针对振动设备监测的常用算法开发应用。该系统充分体现虚拟仪器的概念,以计算机为主体,以测试分析软件为核心,配备传感器、数据采集模块等外围设备,以较低的成本,完成了各种传统信号测试仪器的功能。测试系统软件建立在．NET开发平台上,以C#语言与NI公司的Measurement Studio混合编程实现测试算法及用户界面。另外,系统界面友好、操作简便、可移植性强,已在振动设备测试方面进行了初步应用。

基于Measurement Studio的数据采集系统的设计与实现

在V isual C++环境下,结合NI公司的PCI-6034E多功能数据采集卡,利用多线程技术与Measurement Stud io用户界面控件和分析函数库,以及东方振动和噪声技术研究所的DASP2000 Professional软件,设计并实现了大型烟气机组轴向位移模拟输出信号数据采集系统的多通道信号采集、存储、实时显示及分析等功能。

Calorimetric power measurements in the EAST ECRH system

In this paper, the measurement method of calorimetric power for an electron cyclotron resonance heating（ECRH） system for EAST is presented. This method requires measurements of the water flow through the cooling circuits and the input and output water temperatures in each cooling circuit. Usually, the inlet water temperature stability is controlled to obtain more accurate results.The influence of the inlet water temperature change on the measurement results is analyzed for the first time in this paper. Also, a novel temperature calibration method is proposed. This kind of calibration method is accurate and effective, and can be easily implemented.

A Measurement System for Railgun Test

A measurement system was designed to measure the railgun's parameters in launching process,which includes Rogowski coil sensor for measuring rail's current,B-dot probe for obversing projectile's velocity in bore,net target for catching muzzle velocity,signal condition circuit and high-speed data acquisition card for analyzing and storing data.Its software was also developed in WINDOWS operational environment via modularized design.The designed sensors and test software were successfully used in a practical electromagnetic railgun system to monitor the process of launching.The test results indicate that the state of launching can be intuitively observed and the parameters are accurately acquired and recorded.The software design method can shorten the development cycle,enhance the system's flexibility and provide the interface for the secondary development.The system shows great reliability.It is an effective and practical measurement platform for further research on the electromagnetic launch system.

Development and Application of Real-time Bridge Scour Monitoring System

Because of the complex nature of the changes in the current and movement of the riverbeds by bridge scouring, it is impossible to understand or predict these changes. In order to have a reliable data, it is critical to have the current methods and equipment for measuring bridge scouring replaced with technology that could acquire real-time bridge scouring data. Despite the critical need for real-time data acquisition, the harsh environmental conditions have prevented the scientific community from acquiring real-time data. Harsh environmental conditions were addressed by the developmental of an automated, remote data collection system, allowing real-time data such as scour movement, scour depth, and scour trend to be viewed in a safe location. As a result, accurate sea-floor movements were seen for the first time, aiding the direction and future of bridge scour research, ultimately contributing greatly to the safety of bridges.

手持三维激光扫描仪在城市更新立面测量中的应用

随着科技进步及不断演化,手持三维激光扫描仪作为一种高效、高精度的测绘仪器,近年来在各行各业得到了广泛关注和应用。本文针对采用传统仪器对城市更新过程中旧房改造立面测量作业效率低下,且复杂建筑物绘制难度大,精度难以保证等缺点,探讨了手持三维激光扫描仪的技术特点、参数,并重点介绍城市更新旧房改造立面测量技术流程和应用案例分析,最后对手持三维激光扫描仪的应用前景进行展望。本文对提升城市更新旧房改造立面测量技术具有重要意义。

Twitter Sentiment at the Hospital and Patient Level as a Measure of Pediatric Patient Experience

Although pediatric cancer survival rates have improved, cancer is still the leading cause of death by disease among children in the United States. With nearly 16,000 new diagnoses each year of children having an average age of six years old, there is still much to be done to improve survival rates among children diagnosed with cancer. Additionally, clinical outcomes can be greatly improved by first understanding the patient perspective and, consequently, there is a need to understand the pediatric cancer patient experience. Interest in the analysis of patient-reported outcome (PRO) measures, including those specific to patient experience, has grown in recent years as attempts are made to understand and assess latent (i.e., unobserved) traits such as quality of life. While most traditional PRO measures involve lengthy and costly surveys that are limited in scope, posts on social media platforms are frequently lauded as more authentic, unbiased measures of patient experience. While many previous studies have utilized Twitter as a source for patient experience data that is not easily captured by traditional PROs, very few studies have examined the use of Twitter data to explore and better understand the experience of pediatric cancer patients specifically. Lexicon-based sentiment analysis of Twitter data was used both to examine the pediatric cancer patient experience as well as to compare the attitudes, perceptions, and overall impressions of individuals with St. Jude experiences to those with more general experiences. Results indicated that patients reflected on their care with more relative negativity when speaking of experiences other than St. Jude. While there were some notable differences between the two comparison groups, the sentiment of both was still mostly positive. Pediatric oncology differs greatly from adult oncological care and, thus, the proposed use of sentiment analysis with patient social media posts serving as authentic PRO data likely differentiates more between medical providers and clinical care settings when assessing adult patient experience. Despite limitations, this exploratory study suggests that Twitter can be utilized as a source for authentic, real-time patient experience data that will improve overall care and better clinical outcomes, even among the pediatric cancer patient population.

数据采集系统共模抑制比的测量实验研究

介绍了数据采集系统共模抑制比参数的概念、内涵及定义,并阐述了数据采集系统共模抑制比测量中的5个问题:1)共模干扰的非线性问题;2)共模干扰表现形式的多样性,即直流偏移形式,交流波动形式,噪声水平变化形式;3)本底噪声影响的测量及剔除方式,即方差(能量)相减方式,有效值差方式,绝对值均值差方式;4)共模信号端接方式的影响;5)直流共模抑制比和交流共模抑制比的差异。以一个典型数据采集系统上的实验结果,阐述了上述不同条件变化对共模抑制比测量结果的影响,给出了数据采集系统共模抑制比测量的技术建议。

固体推进剂侵蚀燃烧状态下的动态燃速测试方法研究

为了测量固体推进剂在侵蚀燃烧状态下的动态燃速,设计了侵蚀燃速测试系统。该测试系统以透明窗发动机为主体,包括压力传感器、高速相机和数据采集系统。透明窗发动机用于构建推进剂试样产生侵蚀燃烧的高温高压横向燃气流条件,高速相机用于采集试样表面燃烧退移过程。以某制式丁羟推进剂为测试对象,开展了侵蚀燃烧热试车试验,并结合数值研究,对所构建的侵蚀燃速测试方法及数学模型的准确性进行分析与验证。结果表明:该侵蚀燃烧测试方法具有低成本、高效率等一系列突出优点,能够实现单次试验获得多组数据,适用于多种固体推进剂的侵蚀燃速快速测量。

基于LabVIEW的离合器摩擦片性能试验台测控系统设计

针对摩擦片性能试验台架测量精度低、人工操作复杂的问题,开发了一种基于LabVIEW的摩擦片性能试验台测控系统,对系统关键信号采集并进行了信号处理,基于队列状态机设计了压力和转速的自动化调节方法。台架试验结果表明:该测控系统在监控采集和控制方面均满足实际需求,提高了试验台的自动化程度,具有一定的应用价值。

电子测量技术实验教学案例设计

电子测量技术是一门工程实践性较强的专业课程,课程实验内容的设计至关重要。文章给出了实验总体设计思路,并详细介绍了各个实验的设计目的和内容。这些实验涵盖了通用电子测量仪器的使用和虚拟仪器测量中数据采集、传递、处理、存储、显示全流程要素所需的知识点和技能点,可操作性强,富有启发性。经过多年的教学实践验证,这些实验激发了学生的学习兴趣,夯实了学生的理论基础,培养了学生的实践创新能力,同时也为电子测量技术及其他相关课程的实验教学提供借鉴。

自动化近场声全息扫描测量系统的设计与实现

针对基于多参考互谱法的近场声全息技术测试效率较低的问题,设计了一套自动化近场声全息扫描测量系统。该系统使用高精度直线导轨滑块机构,下位机使用可编程逻辑控制器控制传声器阵列快速、准确移动至预设测量位置;以NI公司的嵌入式实时控制器和数据采集卡作为数据采集设备的硬件,利用LabVIEW软件编写数据采集程序,实现多通道声压数据的实时采集。为了将传声器阵列移动和数据采集两个过程结合起来,实现测量位置声压的自动采集,文章基于QT应用程序开发框架编写上位机程序,对可编程逻辑控制器和数据采集设备进行控制,完成自动化扫描测量的整个流程。实验结果表明,该系统能够快速、准确地采集全息面上的声压数据,从而提高近场声全息的测试效率。

基于LabVIEW的定容燃烧弹控制与数据采集系统设计

为了解决传统定容燃烧弹系统实验操作繁琐、数据采集精度低、数据传输慢和系统控制效果差等问题,设计了一种定容燃烧弹控制与数据采集系统。首先,对定容燃烧弹各系统进行方案设计,结合传感器、点火线圈和高速摄像机等硬件搭建系统的功能模块;其次,完善LabVIEW软件编程上位机对单片机、cRIO控制器组成的下位机的系统控制和数据采集;最后,通过实验测试系统的性能。结果表明:设计的控制与数据采集系统实现了定容燃烧弹系统的集成化,优化了实验步骤,提高了实验效率,提升了数据采集精度和数据传输速度,并实现系统数据采集与控制的数字化、图像化和自动化。所设计的定容燃烧弹控制与数据采集系统可进行预混燃烧及喷雾实验,可为内燃机和燃气轮机等燃烧室的设计及合理应用提供参考。

基于PLC的自动测流机器人系统设计

针对当前河道测流存在的效率和自动化程度较低、测量模式单一等问题,提出了一套基于可编程逻辑控制器(PLC)的河道自动测流机器人系统设计与实现方案。该机器人系统由运动系统、采集系统、人机交互以及远程通信四大模块组成。首先,设计了自动测流机器人系统的硬件结构,实现了自动测流机器人在河流轨道上运动、铅鱼收放等功能。然后,开发了基于PLC的测控系统,设计了PLC梯形图和硬件连接方案,实现了自动测流机器人运动控制。最后,自动测流机器人系统通过RS-485通信协议将多传感器采集的数据传输到操控屏,结合4G远程技术,实现了采集数据和操作指令的远程传输。通过现场模拟的采集测试,该机器人系统可实现自动测流、远程操控、故障自检等功能,并提供多种测量模式,满足河道测流的使用需求。该系统的设计为开展智能化河流数据采集的研究奠定了基础。

面向空中风力发电系统的高空风场观测

[目的]文章旨在研究空中风力发电系统(Airborne Wind Energy System,AWES)的测风需求及设备选型。[方法]以某空中风力发电示范工程为依托,开展测风激光雷达与风廓线雷达的对比观测试验,并对数据获取率、垂直廓线特征和时间变化特征进行分析。[结果]结果显示:在3 km高度范围内,测风激光雷达的数据获取率随高度递减至不足0.4,风廓线雷达的数据获取率则维持在0.98以上,具有更好的观测适应性;两种测风设备的风速、风向垂直廓线以及逐日、多日波动特征均具有一致性,并且能被再分析资料和高空气象站同期探空资料所验证。测风激光雷达观测结果的中位数、极差、标准差等统计特征与再分析资料更接近,相关性更好;风廓线雷达观测结果的极差和标准差整体偏大,测风精度不及测风激光雷达。[结论]文章研究表明,应根据项目所在地的气候状况,在空中风力发电站工程的不同设计阶段合理选择测风设备,科学设置测风方式。

煤矿井下定向钻孔随钻测量数据综合采集系统研究

当前煤矿井下定向钻孔随钻测量装备与系统之间相互独立,导致孔底随钻测量数据形式各异,形成数据孤岛的问题。基于B/S系统架构模式,通过对比随钻测量方式、测量数据格式,分析数据综合采集系统需求模块;搭建综合采集系统后台数据库,开发了煤矿井下定向钻孔随钻测量数据综合采集系统。验证表明,数据综合采集系统满足多种随钻测量数据统一汇总处理和整体分析评价功能,并完成数据实时上传,为煤矿井下定向钻孔数据监管平台提供数据网络传输保障,提高煤矿井下钻探智能化水平。