Showing papers on "Data acquisition published in 1982"

Chicago Monostatic Acoustic Vortex Sensing System. Volume IV. Wake Vortex Decay.

Abstract: : A Monostatic Acoustic Vortex Sensing System (MAVSS) was installed at Chicago's O'Hare International Airport to measure the strength and decay of aircraft wake vortices from landing aircraft. The MAVSS consists of an array of acoustic antennas which measure the vertical profile up to 60-m altitude of the vertical component of the wind. The decay in wake vortex strength is measured as the vortex passes over successive antennas in the array. Volume I (published in October 1979, 32 pages) described the MAVSS principles of operation, the hardware developed, and the data reduction methods employed. Volume II (published in September 1981, 162 pages) described the analysis of MAVSS data to examine whether landing B-707 and DC-8 aircraft need to remain divided into Heavy and Large categories on the basis of the wake vortex hazard. Volume III (published in January 1982, 25 pages) summarized the results of Volume II in terms of the saftey implications of categorizing all landing B-707s and DC-8s as Large aircraft. In this volume, the statistical methods used to understand wake vortex decay are described and the data on all common jet transport aircraft are presented. (Author)

Digital image processing for speckle flow velocimetry

Abstract: A new method is presented for the analysis, by digital acquisition and processing, of speckle fringes in fluid mechanics.

Device for the sequential transmission of signals by radio or by cable, between a central control system and data acquisition apparatuses

Abstract: Device for the sequential transmission of signals by radio or by cable between a central control and recording station and local data acquisition apparatuses, comprising cables connecting said data acquisition apparatuses to the central station and radio transmission and reception means associated with each acquisition apparatus and with the central station, and switching means for establishing the cable connection and interrupting the radio connection between the central station and any particular apparatus for which said radio connection becomes defective as a result of obstacles on the path between the location of said apparatus and that of the central station.

Time division multiplex transmission of submultiplex sequences of signals from sections of a chain of data acquisition units

Abstract: Time Division Multiplex (TDM) telemetry of submultiplex sequences of signals which may be obtained from successive sections of sensors in a sensor array are transmitted synchronously by locking generators in each section, which determine the time slots in which samples of the sensor signals from each sensor in the array may be transmitted, to successive synchronizing pulses which are generated in the section of the array furthest from the head end of the array where the telemetered signals are received. The synchronizing signals are transmitted once per scan of all of the sensors in the array and phase or time the operation of clock generators and counters which establish the timing so that neither the time slots nor the sensor data signals which are transmitted therein to the collection point at the head end of the array interfere with one another. The sensor array may be a seismic array such as a seismic streamer or spread used in geophysical exploration. Data signals from groups of sensors associated with different data acquisition units of a chain of such units may also be telemetered in synchronous sequences during repetitive scans or frames. Each section or module of the system may be identical and can provide the synchronizing pulses to succeeding section if a preceding unit fails to provide the synchronizing signals.

Automatic temperature calibration method and apparatus

Abstract: In a multiplexed and microprocessor-based data acquisition system involving temperature measurement with temperature resistor thermometer devices (RTD), automatic signal substitution for calibration is effected without physically interrupting the measurement signal path by taking three measurements between the three wires at the input and using with the microprocessor a cancellation algorithm.

System for seismic digital data acquisition over water covered areas

Abstract: A seismic data acquisition system for use in shallow water covered areas comprises a flotation device which serves also to house the electronic components; anchoring device with mechanical filter device to protect the anchor, so as to insure its maintaining its position; seismic sensor device for detecting seismic waves in the water and converting them to electrical signals; radio receiver device for receiving operational control instructions; and device for amplifying, digitizing and storing the electrical signals provided by the sensor, preferably on a removable tape recording device.

Dual purpose array processor for a CT scanner

Abstract: A CT scanner in which the amount of X-ray information acquired per unit time is substantially increased by using a continuous on X-ray source, and a sampled data system with the detector. Because the detector is of the high resolution variety with more than 500 cells, use of a reasonable sampling rate produces data at a rate faster than can be stored to disk by the system computer. The array processor, which forms a part of the standard CT architecture, is interfaced to the data acquisition system and configured to provide real time filtering of the acquired detector data, the filter serving a compressing function to reduce the data rate to one acceptable by the host computer.

Data acquisition circuit

Abstract: A data acquisition circuit is adapted to receive information data, a synchronization pulse and a clock pulse which is transmitted at twice as high as the transmission rate of the information data. The clock and synchronization pulses are processed into a conditioning pulse for a divide-by-two frequency divider so that it conditions the divider to respond to the clock pulse by generating a data acquisition pulse at a frequency corresponding to the transmission rate of the information data in a correct phase relationship therewith.

Data acquisition system and analog to digital converter therefor

Abstract: An RTD bridge is coupled with a microprocessor-based data acquisition system for linear reading of temperature and for accuracy at the level of the precision data acquisition system. A reference divider is paralleled with the RTD bridge between a voltage reference source and ground, and linearization is effected in accordance with a function which is a geometric progression of the measured non-linear count. Calibration is effected in one embodiment with a precision divider, or with the bridge itself by making readings at the lowest and at the highest temperature intended with the bridge, according to another embodiment of the invention.

Cognitions of Work Unit Structure

Abstract: An improved conceptual and empirical approach to identifying dimensions of work unit structure is proposed and tested. Multidimensional scaling procedures utilizing input data from 180 unit respond...

Computer‐controlled plasma emission spectroscopy

Abstract: A mirror system, consisting of a rotating mirror and a pair of coupled stepping mirrors, is used in conjunction with computer control of data acquisition followed by computer reduction of the data for a quick determination of plasma properties.

Experimental control and data acquisition with BASIC in the Apple computer

Abstract: Laboratory experiments can be precisely controlled and data can be collected using the BASIC language on an Apple II+ computer with 48-KB RAM, disk drive, and two timer-I/O cards. The Apple BASIC makes machine language output control routines necessary, but quite convenient. By compiling BASIC, 50–100 inputs/sec are handled. Applications range from operant research and analog data collection to use of the Apple color display capability for stimulus presentations and response recording.

Video data acquisition system

Abstract: A video data acquisition system has a video camera for taking pictures of articles and from the picture image digitizes and selects signals within a predetermined amplitude range as representations of pixels of the picture image. A combination of horizontal, vertical and diagonal pixel collection circuitry acquires, in real time, the pixel counts necessary to establish the identity and orientation of the article represented by the image.

Video data acquisition system and hand-held application module for operation thereof

Abstract: A video data acquisition system includes a vision system having a video camera for taking pictures of articles. The video acquisition system is adapted to acquire, digitize and select signals within a predetermined amplitude range as representations of pixels of the images of the pictures arranged in rows, columns and diagonal lines, and further adapted to provide a total count of pixels in rows, columns and diagonal lines. A hand-held application module for directing the operation of the vision system has teaching capabilities in conjunction with the system for causing the video camera to take repeated pictures of an article within its field of view in various positions to provide identity of the article. The video acquisition system includes means for computing the area and perimeter of the article and for computing the maximum moments and minimum moments, thereby providing an identification of the article and its orientation.

Application of control theory to dynamic systems simulation

Abstract: The application of control theory is applied to dynamic systems simulation. Theory and methodology applicable to controlled ecological life support systems are considered. Spatial effects on system stability, design of control systems with uncertain parameters, and an interactive computing language (PARASOL-II) designed for dynamic system simulation, report quality graphics, data acquisition, and simple real time control are discussed.

Interfacing AEI/Kratos electron spectrometers to a microcomputer for data acquisition and processing

Abstract: Interfacing of a Research Machines Ltd. 380Z microcomputer to an AEI/Kratos ES200 electron spectrometer and Inotech multichannel analyser (MCA) is described. Comprehensive data acquisition and processing facilities are thereby provided. The microcomputer controls the MCA, the ES200 sweep ramp and the ES200 analyser kinetic energy (KE) above which the sweep is applied. The operating and processing program has been developed predominantly in BASIC, permitting the retention of more flexibility than is usual with ‘packaged’ computer systems. Facilities are provided for rapid quantitative elemental analysis by XPS following the automatic execution of repetitive sweeps over a sequence of up to 10 KE regions. Peak maximum KEs and widths are also computed, and X-ray satellite contributions can be subtracted from the spectra. In addition, integral spectra, 5–25 point smoothed spectra and their first and second derivatives can be generated.

Data Acquisition Aspects of Super-PETT

Abstract: Incorporation of differential time-of-flight (TOF) information in positron emission tomography offers significant performance improvement at the cost of increasing the quantity of data to be processed. A tomographic unit utilizing TOF data, called Super-PETT, is currently nearing the final stage of construction. Design and implementation aspects of the data acquisition system are described with an emphasis on instrument operation in an on-line preprocessing mode.

A system for measuring deep‐level spatial concentration distributions

Abstract: A deep‐level defect distribution profiling system using both analog and digital data‐acquisition concepts is described. Analog circuits and digital data processing are used to provide high‐speed acquisition and a high dynamic range, respectively. The implementation has an advantage of easy adaptation with an existing deep‐level transient spectroscopy system having minimal software development. Additional advantages are the capabilities of eliminating long‐term system drifts and superposition of data taken subsequently for averaging in order to conveniently achieve a desirable signal‐to‐noise margin. Several examples using ion‐implanted n‐type and p‐type Si Schottky diodes are given. In addition, a metal‐oxide‐semiconductor field‐effect transistor after a Si+ implant and annealing at 600 C is illustrated to indicate a high surface‐defect concentration due likely to the recoiling process.

IPNS Distributed Processing Data Acquisition System

Abstract: The Intense Pulsed Neutron Source (IPNS) at Argonne National Laboratory is a major new useroriented facility which has come on line for basic research in neutron scattering and neutron radiation damage. This paper describes the distributed processing data acquisition system which handles data collection and instrument control for the time-of-flight neutron scattering instruments. The topics covered include the overall system configuration, each of the computer subsystems, communication protocols linking each computer subsystem, and an overview of the software which has been developed.