LabVIEW-based auto-timing counts virtual instrument system with ORTEC 974 Counter/Timer

In order to achieve the auto-timing counts measurement of nuclear radiation using ORTEC 974 Counter/Timer, an auto-timing counts virtual instrument system based on the LabVIEW virtual instrument development platform and GPIB instrument control and transmission bus protocol is designed in this paper. By introducing software timing technique, the minimum time base of factory setting improves from 0.1 s to 0.03 s. The timing counts performance and longtime stability are also discussed in detail. The automatic data recording and saving facilitates data analysis and processing. Its real-time display and statistic function is very convenient for monitoring the nuclear radiation.

The engine performance LabVIEW virtual instrument test system design

This paper adopts American National Instruments (NI) Company’s LabVIEW and LabVIEW RT virtual instrument softwareplatform and lots of things for this engine performance LabVIEW virtual instrument test system, such as the matched NI PCI dataCollection Card, NI SCXI signal-adjusting instrument and NI compact FieldPoint (cFP) distributed I/O real time system hardware.This system has realized multi performances’parallel test; and it can complete load, torsional moment, rotate speed, power, pressureand temperature’s real time monitoring automatically according to user’s setting; and finally through TCP/IP protocol it realizes testdata’s teleshare and telecontrol that user put on the test system. This system has such character as short development period, highuse efficiency and low cost, at the same time it has strong extensibility and reusability, so it has very high applied cost.

Virtual instrument for controlling and monitoring digitalized power supply in SSRF

The Shanghai Synchrotron Radiation Facility (SSRF) needs extremely precise power supplies for their various magnets. A digital controller is being developed for the power converters of the SSRF power supply (PS). In the digital controller, a fully digital pulse-width modulator (PWM) directly controls the power unit insulated gate bipolar transistor (IGBT) of the PS. A program in LabVIEW language has been developed to control and monitor the digital PS via serial communication (RS232) from a PC and to modify its parameters as well. In this article, the software design of the virtual instrument for controlling and monitoring digitalized PS and its associated functions are described, and the essential elements of the program graphical main-VI and sub-VI source code are presented and explained. The com- munication protocol and the structure of the developed system are also included in this article.

Design of Arbitrary Waveform Generator Based on Virtual Instrument Technology

A desiga of arbitrary waveform generator using NI PXI- 5412 module （an arbitrary waveform generator） was provided in this paper, based on virtual instrument technology and LabVIEW. The generator can produce standard function waveforms, such as sine, triangle, square wave with adjustable amplitude and frequency. It can also produce arbitrary waveforms of different data files importing by Analog Waveform Geaemtor Software. A heart dectric wavefonn was set as an example of arbitrary waveform generation. It has practical value, because the standard functions and heart electric waveforms generated by the generator can be used in laboratories.

Application of Virtual Instrumentation in HL-2A DAPS

HL-2A DAPS is a large scale special data system for HL-2A tokamak . Technology of network, communication, data acquisition, data processing, real-time display, data management and systems management have been used in this system. With higher quality products and lower design costs, virtual instrumentation has been widely used in HL-2A DAPS. Vh-tual instrumentation combines mainstream commercial technologies, with flexible software and a wide variety of measurement and control hardware. It＇s easily to create user-defined systems that meet the exact application needs for the experiment.

A virtual logic analyzer implemented with Arduino

A simple,stable and reliable virtual logic analyzer is presented. The logic analyzer had two modules:one was the test pattern generation module,the other was the logic monitoring module. Combining the two modules,one is able to test a digital circuit automatically. The user interface of the logic analyzer was programmed with LabVIEW. Two Arduino UNO boards were used as the hardware targets to input and output the logic signals. The maximum pattern update rate was set to be 20 Hz. The maximum logic sampling rate was set to be 200 Hz. After twelve thousand cycles of exhaustive tests,the logic analyzer had a 100% accuracy. As a tutorial showing how to build virtual instruments with Arduino,the software detail is also explained in this article.

Underground vibration signal detection and processing system based on LabWindows/CVI

In order to detect and process underground vibration signal, this paper presents a system with the combination of software and hardware. The hardware part consists of sensor, memory chips, USB, etc. , which is responsible for capturing original signals from sensors. The software part is a virtual oscilloscope based on LabWindows/CVI （C vitual instrument）, which not only has the functions of traditional oscilloscope but also can analyze and process vibration signals in special ways. The experimental results show that the designed system is stable, reliable and easy to be operated, which can meet practical requirements.

基于LabVIEW虚拟仪器和机器视觉测量普朗克常量和光波波长

设计了基于LabVIEW虚拟仪器和机器视觉的普朗克常量和光波波长测量综合实验装置.该装置以发光二极管为测量对象,综合运用了基于机器视觉技术的NI Vision Builder AI,ImageJ以及科学数据绘图软件Origin测得普朗克常量,其大小与普朗克常量的公认值接近.另外,该装置为学生提供了测量普朗克常量新的思路和方法,可作为对传统光电效应法测量普朗克常量实验的补充,有利于学生创新能力的培养和提高.

通过LabVIEW虚拟仪器技术研究随机误差的正态分布

本文以虚拟仪器技术LabVIEW为软件平台,结合NI-USB6009数据采集卡,对直流电压和信号发生器的正弦波信号分别进行测量和数据采集,对直流电压及正弦信号频率和幅值的测量结果进行统计研究,得到电压、正弦信号频率和幅值的统计结果为正态分布.对周期信号增加单个周期的采样数,可以减小频率测量的标准差,提高频率测量的准确度.该实验可以对学生开设为通过实际测量研究随机误差的正态分布规律的实验.

A Review of Data Acquisition System based on LabVIEW

With the continuous development and expansion of automotive industry, car safety problems are widely concerned by most of us. In order to make it easier to adjust car′s real-time body posture, it is necessary to design a real-time data acquisition system, thus reducing the number of casualties in normal driving. A brief account of the development status of data acquisition system at home and abroad, and the concept, principle,function of virtual instrument platform are given. The advantages and disadvantages of the data acquisitionsystem, based on LabVIEW in different methods of data acquisition, are analyzed and compared, and put forward some improvements and optimization, so the real-time data acquisition system can meet the requirement of adjusting the state of the vehicle, improving real-time of data acquisition and processing. Finally, it indicates the development direction and prospect of data acquisition system based on LabVIEW.

A Miniaturized System for Neural Signal Acquiring and Processing

To collect neural activity data from awake, behaving freely animals, we develop miniaturized implantable recording system by the modem chip：Programmable System on Chip （PSoC） and through chronic electrodes in the cortex. With PSoC family member CY8C29466,the system completed operational and instrument amplifiers, filters, timers, AD convertors, and serial communication, etc. The signal processing was dealt with virtual instrument technology. All of these factors can significantly affect the price and development cycle of the project. The result showed that the system was able to record and analyze neural extrocellular discharge generated by neurons continuously for a week or more. This is very useful for the interdisciplinary research of neuroscience and information engineering technique. The circuits and architecture of the devices can be adapted for neurobiology and research with other small animals.

基于LabVIEW的心电信号与多数据采集分析系统设计

近年来心血管疾病的发病率和死亡率不断攀升。为了给人们提供一个较为准确的心电信号分析结果,该系统以心电信号为感知节点,结合虚拟仪器技术,打造一个准确性更高、成本更低、更可靠的心电信号分析系统。它的优点在于会结合使用者的各种因素,如:所处气象、饮食、地理位置、身体状况和生活习惯等因素,并结合已经发展较为成熟的心电信号数据分析手段,在对连续的心电图数据实时采集处理与分析功能方面,此设备具有数据实时性、精度较高等特点。结果表明,结合了多数据的分析结果,比单一分析系统给出的结果更为准确,也更加能够满足人们的需要,这将对预防和治疗心血管疾病产生重要作用。

基于LabVIEW的微型燃气轮机测控系统设计

鉴于微型燃气轮机在分布式发电方面的重要作用与虚拟仪器的快速发展,为了提高微型燃气轮机数字化测控效率,设计了基于LabVIEW的微型燃气轮机测控系统,并进行了硬件选型和软件开发。在硬件方面,采用高精度的测控仪器与采集设备,提高了测试精度。在软件方面,设计了仪器控制、数据采集与显示、数据存储和报表生成等功能模块,并对采集的信号进行滤波处理,削减了干扰信号的影响。相比于传统的测控系统,该系统可以实现稳定的控制,且界面友好、操作简单、自动化控制程度高。通过对微型燃气轮机启动、点火和升速过程的试验测试,表明了该系统能够满足微型燃气轮机性能测试要求,验证了该系统的可行性。该设计有助于微型燃气轮机的数字化发展。

LabVIEW与PLC相融合的控制系统研发

随着计算机软件与测控系统的紧密结合,仪器仪表本身的结构概念和设计理念发生了突破性的变化,从而出现了一种新的仪器仪表概念——虚拟仪表(Virtual Institute),即虚拟仪表(Virtual Institute)。该仪器技术是利用LabVIEW软件程序利用程序框图和西门子PLC进行编程,将传统的测控技术与计算机技术有机结合起来。测控技术系统以虚拟仪器为基础,主要由人机交互界面、测试控制部分和数据采集三个部分组成。操作人员只需要通过观看直观的人机交互界面,系统中的各类数据信息即可被精确的控制,大大简化流程操作,提高了设计进程和装置的综合性,积极意义明显。

泵站SCADA系统增加基于LabVIEW的数据采集

本文以某源水泵站为例,通过在原有InTouch为组态软件的SCADA系统上增加一套基于LabVIEW的数据采集系统,采集泵组振动和噪音信号,并与SCADA应用之间通过OPC通信,传递数据,实现水泵机组的实时监测和故障报警功能。

基于LabVIEW数据采集系统

虚拟仪器技术在仪器领域显示了强大的生命力。介绍了虚拟仪器领域中最具有代表性的图形化编程开发平台LabVIEW,并对LabVIEW驱动普通数据采集卡进行了研究。总结了调用Lab VIEW的端口操作图标、利用CIN图标调用C语言驱动程序及动态数据交换(DDE)技术实现Lab VIEW驱动普通数据采集卡的方法。针对双诺AC6010卡,成功地实现了可供LabVIEW直接调用的动态库的编制与调用。开发出了一套性价比较高的数据采集系统。

基于LabVIEW的数据采集与信号处理

介绍了LabVIEW 7 Express开发环境下数据采集与信号处理的实现方式。以计算机和USB2002数据采集卡为主要硬件,LabVIEW为软件开发平台,构建了用于实现信号的采集与信号分析的多功能虚拟仪器系统。系统可实现单通道、多通道数据的采集,信号分析,以及数据的存储和对历史数据的复现。在降低设备成本的同时,该系统还具有友好的人机界面,并且方便进行维护和实现功能扩充。该系统已应用在电力系统试验中,充分体现了方便、快捷、实用等诸多优势。

基于LabView虚拟仪器的CO_2焊接参数采集分析系统

描述了基于NI虚拟仪器的焊接参数采集分析系统。作者设计了焊接电流和焊接电压信号采集电路 ,并针对焊接过程的不同阶段 ,加入时刻标定信号 ,方便后续分析 ,并在文中详细介绍了系统的软件流程。通过实际焊接试验 ,实时采集和显示各个信号波形 ,同时系统能够对相应的焊接电流和焊接电压进行统计分析运算 ,得到研究所关心的焊接过程特征参数以及对焊接过程主要参数的概率密度分布图。试验表明该系统工作稳定 ,采集数据完整可靠。

基于LabVIEW的电滞回线测试系统的开发

测量铁电材料的电滞回线是确定铁电参数、检验材料性能好坏的一个重要手段,目前采用的主要测量手段是示波器法。但是,这种传统的方法无法在测量的过程中对误差进行修正、对数据进行处理和分析。为了克服这种不足,研究和开发了一种基于美国N I公司最新推出的L abV IEW 7.1Express虚拟仪器开发平台的电滞回线测试系统,通过介绍该系统的数据接口、数据处理、数据库链接以及多种语言联合作业的方法,提出了一种新的电滞回线测量方案,并获得了初步的实验结果。