A DATA ACQUISITION SYSTEM FOR RAPID KINETIC EXPERIMENTS

A data acquisition system has been developed to collect, analyze and store large volumes of rapid kinetic data measured from a stopped-flow spectrophotometer. A digital minicomputer, with an A/D converter, tape drive unit and formatter, analog recorder, oscilloscope, and input/output terminal interfaced to the stopped-flow spectrophotometer provides the complete system. Timing for actual data collection is generated through internal computer software with inclusion of A/D conversion time. After a simple initialization from the computer console, software programming provides complete interaction between a user and the terminal. The user is directed through the initialization by a series of decision steps. The first step is to choose a data file, either existing or new. Once the desired file is selected, several options including data collection, analysis, storage, and printing are selectable.

Ozone decomposition and the rapid reaction between ozone and cyclohexene in neutral solutions were studied using the data acquisition system. At 25°C, the ozonation reaction was found to have a second order rate constant of 2.19 × 10⁶ l/mole-sec (less than 10^-3 sec. half life).     

基于研华数据采集卡和MCGS组态软件的离子镀膜监控系统设计

利用MCGS组态软件和研华公司工控机数据采集板卡来架构离子镀膜设备的监控系统。采用MCGS组态软件进行监控系统软件开发,实现人机交互界面。数据采集卡通过ISA总线与工控机连接,利用采集卡的驱动程序完成各种模拟量、开关量的输入/输出。监控系统可以实现全工艺过程的自动控制、参数显示和故障自动诊断,提高了电弧离子镀膜设备运行的稳定性、精确性和可靠性。     

基于组件技术的虚拟测试系统开发

将传统的通用信号发生器与通用的测试仪的功能通过LabVIEW这个软件开发平台实现功能的高度集成,开发一种通用自动测试系统。以计算机和数据采集卡为基本硬件来实现激励信号的产生和响应信号的采集,本系统采用软件工程中面向组件的设计思想,从而使繁琐的编程过程转变为组件的开发和搭接两个步骤,同时采用严格数据类型的枚举控件,极大地提高了系统的可重用性和可扩展性。同时利用LabVIEW中同步控制技术中的Queue技术来完成通用自动测试系统组件的搭接,从而实现了信号源和测试仪的集成,由此避免了数据的丢失。     

基于单片机的传感器数据采集系统

基于C8051F060单片机内置的数模转换器设计传感器数据采集系统，应用Visual Basic程序语言进行上位机设计，接收单片机发送的数据，并进行波形还原，实现实时数据采集功能。     

An off-line system for data acquisition and analysis

A generalized solution to the problem of laboratory data acquisition and data reduction will be discussed. The Nuclear Data 7700 System represents a new approach to laboratory data acquisition and reduction in that it is capable of interfacing with, providing complete data analysis and generating comprehensive output reports for many instruments in the analytical laboratory. Featuring both off-line data reduction and digital magnetic tape cartridge program storage, it was designed to offer an economical and minimum obsolescence solution to the data reduction problem. The system allows the full capability of a small general purpose computer to be employed with a variety of computer programs to perform data analysis for a variety of instruments. Besides software availability, providing complete data reduction and comprehensive output reports, for the more important analytical instruments such as Gas Chromatographs, IR and Atomic Absorption Spectrophotometers, Physical Testing Instruments, etc., the flexibility of this approach makes computerized data reduction practical for such instruments as Thermal Analyzers, Titrators, etc. The gas chromatography data handling aspects of the system are discussed in detail. One of seven papers to be published from the Symposium “Computer Systems and Applications in the Oil and Fat Industry” presented at the American Oil Chemist’ Society World Congress, Chicago, September–October 1970.     

Versatile IEEE-488 data acquisition and control routines for a diode array spectrophotometer

The UV-visible diode array spectrophotometer is a work-horse instrument for many laboratories. This article provides simple data acquisition and control routines in Microsoft QuickBasic for a HP-8452A diode array spectrophotometer interfaced to an IBM PC/XT/AT, or compatible, microcomputer. These allow capture of full spectra and measure absorbance at one or several wavelengths at preset time intervals. The variance in absorbance at each wavelength is available as an option.     

高压气体装置性能检测系统

介绍了高压气体装置性能检测系统的基本组成,阐述了气体流动性能检测和气密封检测的工作流程,设计了由计算机、PLC、传感器和组态软件组成的数据采集、控制系统,通过合理分配PLC模块的I/O接口和优化设计组态监控程序,实现对系统试验过程中实时数据的采集、监控和远程控制.     

An interactive video-computer tracking system for quantification of locomotor behavior

We have developed a flexible, moderately priced, behavioral analysis system which has been used to determine the response of salmonids to certain olfactory stimulants. The system, which we call ITS for interactive computer-video tracking system, consists of a 128K Apple IIe computer with software, a video camera and videocassette recorder, and a special-effects generator. Experiments are video taped and then, during playback, the special effects generator is used to simultaneously display the video image and the graphics output of the computer on a monitor. The user tracks the animal of interest using an electronic pen, and the position of that animal in the test chamber, in the form ofx-y coordinates, is determined by the computer at user-defined time intervals. When tracking is complete, a plot of the track of the animal is printed within the outline of the test chamber. The following data can also be calculated: swimming velocity, distance from a predetermined point in the chamber (for example, olfactory stimulant source), and time spent in a given area. These variables can be calculated over any chosen time periods and/or for the entire experiment. ITS has numerous advantages over commercially available devices that perform similar tasks. First, it is relatively inexpensive, especially if one already owns video equipment and a computer. Second, it can analyze many types of experiments that can be stored on video tape, including field observations or manipulations. Third, because it is not automated, it is easy to track multiple objects, even if their tracks cross or are not easily located against a low-contrast background. Finally, because whole images do not have to be digitized, and data collection intervals can be adjusted by the user, it is possible to analyze very long experiments with a microcomputer. In this paper we describe ITS and then we demonstrate how we have used it to demonstrate that changes in ambient pH alter the behavioral response of juvenile Atlantic salmon to olfactory stimuli.     

Data acquisition system for electrochemical applications

A low cost data acquisition system for electrochemical cells has been devised on the basis of the new microprocessor computer generation with IEC-BUS interface connections. This modular structure allows the application and extension of the proposed system to all IEC-BUS compatible measuring apparatus. Our special interest was focused on the control of experiments with a large data flow like impedance spectroscopy as well as long time experiments like the temperature dependence of a cell e.m.f. Beside this, experiments like d.c.-conductivity, discharge characteristics and current-voltage curves can easily be carried out. The programs have been developed in a way which allows an application of the system in scientific laboratories as well as in the routine quality control of electrochemical device production.Data acquisition system and computer programs are also in part available from Garching Instrumente, D-8 München 19.IEC-BUS or ASC 11-BUS or HP-IB-BUS following IEE-Standard 488-1975 or DIN 6622 IEC-TC 66.     

基于单片机的USB-HOST数据采集仪表设计

采用单片机设计了一款基于USB-HOST接口的低成本数据采集仪,它实现了单片机与U盘设备间的读写操作。为了适应长时间采集工作而对文件以时间信息命名,操作外设芯片DS1302进行授时,将每一固定时间间隔的数据写入同一文件从而方便桌面计算机的分析与后期处理。     

Rapid rotating-disk-electrode evaluation of catalyst performance and durability during transient conditions: The Pt–Hf binary system

A comprehensive set of rotating disk electrode (RDE) tests has been developed to test the suitability of fuel cell catalyst candidates for use as either anode or cathode catalysts for transient conditions. The activity for Hydrogen Oxidation reaction (HOR), Oxygen Reduction reaction (ORR) and Oxygen Evolution reaction (OER) is tested together in one protocol. A total of 5 Pine Instruments RRDE test stations have been set up with automatic gas flow switching and computer software to control all aspects of the data collection process. The user simply sets up the electrochemical cell with a gas bubbler, reference electrode, counter electrode and sample and then selects a series of tests to be run. The software then switches gas flow, rotation rates and potentiostat set up files automatically. This infrastructure allows the rapid characterization of catalyst candidate materials. The series of tests is described, along with the purpose of each test in the protocol. As an example, the data collected from a Pt_1−xHf_x composition spread is presented. The optimal composition is found to be approximately 30 at.% Hf, when the ORR performance begins to decrease at a faster rate than the HOR performance and the OER current at 1300 mV is also a maximum. However, it was determined that from an applied point of view the drop in ORR performance was insufficient to adequately protect the cathode from the effects of the transient potentials during start-up of the fuel cell.     

基于虚拟仪器和MSP430单片机的数据采集系统的开发

利用虚拟仪器技术和MSP430F149单片机丰富的片内资源,开发了一种数据采集系统.以MSP430F149单片机为核心设计了系统的数据采集模块、存储模块、串行通讯模块以及电源模块;在定义上下位机间通讯协议的基础上.采用LabVIEW对系统的上位机软件进行了开发;结合MSP430F149单片机的ADC12模块和USART...     

基于TCP和μC/OS-Ⅱ的数据采集系统研究

基于ARM7处理器LPC2210的锁相环功能与处理器的时钟频率,描述了A/D转换时钟频率的计算公式。设计了基于ARM7的数据采集系统。阐述了基于I~2C总线协议实现数据存储的功能,说明了向存储器写入数据,从存储器中读取数据的函数调用。基于ARM7和μC/OS-Ⅱ操作系统的多任务应用,给出了创建多任务的流程图。通过网页可以显示实时数据采集值、报警上下限值、实时时钟和历史数据。基于TCP协议实现了数据采集与网络传输系统的功能。     

可视化实时数据采集系统设计与实现

介绍一种基于串行接口方式的单片机通用数据采集系统,该系统以AT89C52单片机为核心,从数据的采集、存储与上位机的通信到数据的显示全部采用串行接口器件,从而降低了布线密度,提南了系统可靠性.对系统的硬件组成结构予以详细介绍,并给出了软件流程.     

A fully automatic system for acid-base coulometric titrations

An automatic system for acid-base titrations by electrogeneration of H⁺ and OH^- ions, with potentiometric end-point detection, was developed. The system includes a PC-compatible computer for instrumental control, data acquisition and processing, which allows up to 13 samples to be analysed sequentially with no human intervention.The system performance was tested on the titration of standard solutions, which it carried out with low errors and RSD. It was subsequently applied to the analysis of various samples of environmental and nutritional interest, specifically waters, soft drinks and wines.     

基于VC++的数据采集系统设计与实现

基于VS2010平台利用VC++开发了一套适用于RS232、USB、TCP/IP协议通信接口的数据采集系统。该系统实现了监控计算机与嵌入式仪表设备的通信,满足了不同种类传感器的数据采集和处理。并通过实验验证了系统软件的稳定性。     

Acquisition and analysis of GFAAS data

Since its inception as an analytical technique some 30 years ago atomic absorption spectrometry has become a firmly established method for the analysis of trace metals. Graphite furnace atomic absorption spectrometry provides the analyst with the capability of analysis of solutions containing μg l^-1 levels of the analyte, but, because of the transient nature of the signals, a sophisticated approach to the data aquisition and handling of data is required. Most modern commercial graphite furnace atomic absorption spectrometers have built in microprocessors for this purpose but they often have limited capability for extensible user programs and limited data storage facilities. In this communication we describe the use of an Apple IIe microcomputer for the acquisition of data from a Pye Unicam SP9 graphite furnace atomic absorption spectrometer. Details of the interface which utilizes an in-house designed AD converter, and an overview of the Pascal and assembler programs employed are given. The system allows the user to record, store and dump the graphical display of the furnace signalsfor all analyses performed. Files containing details of peak height, and area are formatted on an eight-column spreadsheet. Details of sample type, concentrations of standards, dilutions and replication are entered from the keyboard. The calibration graph is constructed using a moving quadratic fit routine and the concentrations of the analyte in unknown solutions calculated. In addition to this, greater processing power and integration of the data into other analytical schemes can be achieved by exporting the data to other software packages and computers. Details of data transfer between the Apple IIe and an Amstrad PC 1512 are given. Some examples of the use of the system in the development of an analytical methodfor silver in plant material are given.     

A computer-controlled potentiometric/spectrophotometric titrator

A laboratory computer controlled potentiometric titrator interfaced to a diode array spectrophotometer is described. The titrator consists of widely used, commercially available components; therefore, major attention is given to modes of interconnection and software implementation in data format and system control. Replicate potentiometric titrations of glycines gave a relative standard deviation in titre of 1.035% and a relative standard deviation in pH of 0.745%. Replicate spectrophotometric titrations of bromophenol blue were analysed at three wavelengths to yield pKa= 3.898 ± 0.075 (1.9% rsd).Methods of data presentation and manipulation are presented.     

数据采集系统在压力容器试验中的应用

随着计算机和传感技术的日益成熟,以计算机和传感器为基础的数据采集技术在压力容器试验研究中得到了广泛的应用。目前压力容器试验的规模大、研究对象复杂、试验精度要求高、试验的环境多变、试验周期长,因此把数据采集技术引入到压力容器试验的研究中是必然的。在压力容器接管弯矩试验中,利用数据采集模块、传感器、通信接口、组态软件、微机组成一套数据采集系统对试验中的载荷、接管位移和应变值进行采集处理。系统具有测点多、速度快、精度高的特点,它不仅能够记录数据,而且能集成、管理数据。系统将各种数据信息有条理、有重点地反馈给试验者。     

基于VFC的过程参数信息采集系统设计

由LM331、80C51单片机及其他外围器件组成数据采集系统,对多路过程参数进行信息采集,不仅能提高系统的抗干扰能力,还可灵活提高数据采集的精度。讨论了ADC对信息采集系统的影响后,对基于VFC的数据采集系统的硬件结构、数据采集控制程序进行设计,系统具有良好的通用性和扩展性,应用范围广泛。