Showing papers on "Data acquisition published in 1971"

Experimental methods for engineers

Abstract: 1 Introduction 2 Basic Concepts 3 Analysis of Experimental Data 4 Basic Electrical Measurements and Sensing Devices 5 Displacement and Area Measurements 6 Pressure Measurement 7 Flow Measurement 8 The Measurement of Temperature 9 Thermal and Transport-Property Measurements 10 Force, Torque, and Strain Measurements 11 Motion and Vibration Measurement 12 Thermal and Nuclear-Radiation Measurements 13 Air-Pollution Sampling and Measurement 14 Data Acquisition and Processing 15 Report Writing and Presentations 16 Design of Experiments Appendix A-Conversion Factors and Material Properties Appendix B-Digital Imaging Systems

Seismic exploration system

Abstract: A seismic data acquisition system and method wherein each geophone station is coupled to a data acquisition and telemetry unit module with individual modules being coupled to each other and a central recording station by a single data link such as a coaxial cable, a pair of conductors or radio link.

Security monitoring system and method for an electric power system employing a fast on-line loadflow computer arrangement

Abstract: A security monitoring system for an electric power system includes a data acquisition system and a hybrid loadflow computer arrangement. The hybrid loadflow computer in turn includes an analog network simulator and a digital computer which processes and operates upon acquired on-line data and operator data related to the power system loadflow problem. The analog simulator includes modular circuits representative of power system busses and lines and the interface between the digital computer and the analog network simulator is provided by analog-to-digital and digital-to-analog converters and by line outage contact closure outputs. The hybrid arrangement operates iteratively to provide loadflow solutions, with the analog network simulator providing a bus voltage solution for a set of network simultaneous equations and the digital computer providing bus load and generation injection current calculations and convergence steering control. Because loadflow solutions are generated cyclically and contingency case loadflow solutions are generated with the use of basecase data modified to reflect the contingencies. Modifications are also made in the analog simulator to reflect the contingencies.

Capabilities of a single scan TV-radiographic system for digital data acquisition.

Abstract: A single scan TV-radiography system capable of providing analogue signals ready for A-D conversion for input to a computer has been investigated. Modulation transfer functions of both horizontal and vertical resolution have been obtained. The capability for gray scale reproduction was also investigated. The output data rate of the system is 16 KHz thereby providing compatibility to A-D converters generally available for most computers. In general, the capability of the system was found to exceed the input capabilities of available image-amplifiers and is therefore acceptable for quantitative fluoroscopic applications.

An off-line digital system for use with a gamma camera

Abstract: A system for the off-line collection of data from a gamma camera is described. The data are digitized, buffered and recorded on computer-compatible magnetic tape, together with timing information. A program for processing the magnetic tape records on a powerful, batch-processing computer (CDC 6600) is described briefly. The performance and characteristics of the system are described, and the merits of such a system are discussed relative to small dedicated computer systems attached to gamma cameras.

A Computer Controlled Automatic System for Measuring the Conductivity and Hall Effect in Semiconducting Samples

Abstract: A unique computer controlled automatic system for measuring the conductivity and Hall effect in semiconducting samples is described. The system features a small process control computer which runs a temperature programmable liquid helium Dewar, a magnet, and a data acquisition system. Fifty temperature points can be preprogrammed in any desired distribution over the range 4.2–400 K. The control computer ensures that the system is virtually foolproof in terms of operator blunder and system malfunction. Data acquisition is on punched paper tape with hard copy output. Data, converted from paper tape to cards, are analyzed by a high speed computer. Turnaround times (from sample loading to full analysis of data) of as low as 6 h have been achieved.

Cam plastometer data acquisition system

Abstract: A high-speed system was designed and built to acquire time, temperature and load data from experiments in the cam plastometer. The cam plastometer is a mechanical testing machine which measures a fundamental property of non-brittle materials, namely their resistance to compressive deformation, during such deformation at constant true-strain rates. Early versions of the machine operated at comparatively low strain rates. The machine was constantly improved until it now operates over a wide range of true (logarithmic) strain rates, from 0.05 to greater than 200 s-1. This range of rates requires the versatile, high-speed data acquisition system described in this paper. Operation of the cam plastometer is briefly described; then the sequence of acquiring data during an experiment, of storing these data in a ferrite-core memory, and of subsequently retrieving them for computer processing is given. Operation of the circuits which control input to, and output from, the memory is set forth in detail.

Automation of a residual gas analyzer on a time-shared computer

Abstract: The automation of a quadrupole mass spectrometer - residual gas analyzer (RGA) on a time-shared IBM 1800 Data Acquisition and Control Computer is described. The RGA, which is used to determine the partial pressures of various gases in a vacuum system, may be operated up to a maximum data rate of about 20,000 points/sec (pps) in an interleaved manner with multiple slow-scanning (5≤20 pps) instruments. We review in detail the hardware and software considerations regarding the design and subsequent interfacing of the instrument to the computer. Methods for initiating data collection, entering experimental parameters, and analyzing the experimental data, such as spectrum plotting, smoothing, peak location, mass identification, and calculation of the partial pressures by using a least-squares approximation to fit mass peaks, are discussed with examples.

Universal data acquisition and control system

Abstract: A universal data acquisition and control system using only two lines between a plurality of remote data units. The system uses a central computer connected to a central data unit. The central data unit is tied by two transmission lines (a response line and interrogate line) to a plurality of remote data units. The transmission of information on the interrogate line uses a combination of modulation schemes to maintain costs at a minimum while maximizing the amount in time that information can be transferred from the central data unit to the remote data unit.

Multiple channel direct digital recording of EEG data.

Abstract: A system is described for recording EEG or other psychophysiological data directly on digital computer tape at the time of data acquisition. This system has been designed to study the time-amplitude relationships of signals from the various brain areas through analyses of Fourier transform, coherence, and phase angle.

Skip-spread method for seismic surveying

Abstract: A method of seismic data acquisition wherein the average speed of data acquisition is rapid and the time and total cost necessary for data acquisition are maintained at relatively low levels. A seismic cable may be towed during an activated portion of its travel at a speed sufficiently slow to achieve optimum results of data acquisition and may be towed at a much greater speed during a deactivated portion of its travel thereby causing its average towing speed to be faster than is ordinarily practicable thereby reducing costs of data acquisition without adversely affecting the quality of the seismic data acquired.

An automated deep sea simulation facility for testing electronic components

Abstract: Can off-the-shelf electronic components be used in the deep ocean without protection from the very high hydrostatic pressure? This paper describes a test philosophy and a unique facility designed to answer this question and to determine the mechanisms of failure that are encountered under severe pressure The facility consists of three pressure vessels, each having 150 electrical penetrators and a working pressure of 30,000 psi Vessel temperature is controllable from 0\deg C to 40\deg C The present semiautomatic pressure and temperature control is discussed along with a description of the designed-in capability for complete computer-controlled tests The test philosophy includes the rationale for why the components are energized, what components are currently being tested, what components can be tested, and why failure analysis is performed The data acquisition and reduction system is described as it currently exists and as it will exist when modified into a computer-controlled, real-time data system

SAAC evaluation of the SAAC/LASA system

Abstract: : The report is an evaluation of the SAAC/LASA system known as the integrated Seismic Research Signal Processing System which was programmed by IBM. The system operates in two parts. The Detection Processor performs data acquisition and signal detection. The Event Processor is designed to recognize true signals and false alarms and to extract event parameters, refine locations, and publish an earthquake bulletin. The Event Processor is programmed to work either in an automated mode in which the computer analyzes events and publishes the bulletin without help from a seismic analyst, or to act as an aide to the analyst who can edit the event processing on a display console. The Detection Processor works well as a data acquisition, recording, and signal detection system. The Event Processor with analyst editing is able to handle the data output from LASA and produce and acceptable seismic bulletin within 24 hours.

A calculator controlled medical data acquisition system

Abstract: An inexpensive data acquisition system for multi-bed intensive care units is described. The low cost is achieved by the use of a Wang Calculator for system control. The system permits recording of the values of as many as 12 variables from 12 beds every hour and from a selected bed every minute. Essential features of the equipment and programming are presented.

The Use of a Time-Shared, On-Line Computer to Support Basic and Applied Radiation Research

Abstract: The Sandia Data Acquisition and Display System (DADS) is being used in a time-shared, real-time mode to support basic and applied radiation research. Five remote terminals provide computer access for experiments such as electron beam diagnostics, fast neutron spectrum measurements, static and dynamic reactor fuels testing and neutron damage studies on solid state electronic components. The system has substantially increased radiation facility and experimenter efficiency. This paper describes the DADS and demonstrates its utility by discussing some of the experiments that are currently interfaced to the system.

Application of television techniques to auroral research

Abstract: TV data acquisition system for auroral and ionospheric research, noting visual and subvisual detection sensitivity

Interfacing Photodiode Array Cameras To Microcomputers For Quality Control

Abstract: Optical sensors are rinding increased usage in inspection and quality assurance applications. The versatility and high speed data gathering capabilities of imaging sensors lend themselves to complex applications such as pattern recognition and gray-scale defect deter-minations. Applications of this type usually require computer capability to mandLutte and digest the data but optical scanning rates usually outpace the instruction cycle rates of microcomputers. This paper discusses a method of handling high speed imaging data to pro vide real time computer analysis, decision and control. Methods and technical designs are described that provide data compression, formatting and preprocessing. Hanipulative tech.- niques for both digital and analog (video) signals are discussed.

A Time Shared System for Multiple Independent Laboratories

Abstract: A new approach to computer-based data acquisition and control for multiple, diverse, and remote laboratories is described. Modular techniques are used in the programming system, as well as in the input-output and instrument interfacing facilities. The system is designed to achieve some of the benefits of multiprocessing systems, but at lower cost and with higher system efficiency. Ease of use is stressed throughout, and language processors developed to help achieve that goal are described. An example of initial use is presented.