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Showing papers on "Data acquisition published in 1978"


Journal ArticleDOI
J. Lindsay1, C. Millerin1, J. C. Tarle1, H. Verweij1, H. Wendler1 
TL;DR: A system is described which can handle high input rates and provide very short read-out times, and the non-destructive and fast read- out makes the system attractive for experiments with data pre-processing.

54 citations


Journal ArticleDOI
TL;DR: Data acquisition and control hardware and display and processing software are presented for a biological cell sorter in which the four parameters of information about each cell are stored event-by-event on a computer disk.

49 citations


Journal ArticleDOI
TL;DR: A computer system was developed at NIH, NCI, to add data acquisition, storage, and processing capability to two different flow microfluorometer/cell separators (FMF).
Abstract: A computer system was developed at NIH, NCI, to add data acquisition, storage, and processing capability to two different flow microfluorometer/cell separators (FMF). Data can be collected from either or both cell separators while previously collected data are being simultaneously processed. Measured cell parameters can be accumulated in the computer memory as arrays of cell counts over a range of intensities or stored as raw data in a list mode on magnetic tape. The computer system hardware includes a refresh display, two disks, industry standard magnetic tape, 32K core, an incremental plotter, a link to the central facility, and links to the FMFs. For convenience in program development and to give direct access to additional data analysis resources, a direct 1200 baud link is available to a Central Facility PDP‐10. Programs have been developed to display the data in two dimensions and to create three‐dimensional projections which can be rotated. Two‐dimensional contour maps at user‐selected thresholds a...

49 citations


Journal ArticleDOI
TL;DR: In this article, an extensive study has been made of three methods of determining dead-times mathematically from retention data of n -alkanes, and it has been shown that the linearization procedure suggested by Grobler and Balisz is sufficiently accurate for online data acquisition and that four alkanes are adequate to calculate accurately the dead-time provided that the retention times are not excessive.

42 citations


Journal ArticleDOI
TL;DR: A set of high speed 16-bit computers and ADC's has been designed and built for the data collection, compression, and correction system of the SLAC/LBL Mark II Magnetic Detector.
Abstract: A set of high speed 16-bit computers and ADC's has been designed and built for the data collection, compression, and correction system of the SLAC/LBL Mark II Magnetic Detector. The "Brilliant ADC" controls the analog multiplexing of a CAMAC crate of data acquisition modules, digitizes the analog data, and executes microprogrammed algorithms for data handling and correction.

39 citations


Journal ArticleDOI
TL;DR: A data acquisition system for high-resolution Fabry-Perot interferometry that compensates for all frequency drifts, maintains interferometer alignment, and allows extended data acquisition times in selected regions of a spectrum.
Abstract: A data acquisition system for high-resolution Fabry-Perot interferometry is described. Used in conjunction with a piezoelectrically scanned Fabry-Perot, this apparatus compensates for all frequency drifts, maintains interferometer alignment, and allows extended data acquisition times in selected regions of a spectrum.

21 citations


Journal Article
TL;DR: In this article, a parallel electro-optical input spectroradiometer system with 500 channels and operating in the 400-1100 nm wavelength region has been designed and fabricated for use in a light aircraft.
Abstract: A parallel electro-optical input spectroradiometer system with 500 channels and operating in the 400-1100 nm wavelength region has been designed and fabricated for use in a light aircraft. The airborne system was conceived for determining the high-spectral-resolution properties of various ground targets of interest in remote sensing. Spectral radiance data at 4-digit resolution are generated on a 9-track tape in computer compatible format. At a survey altitude of 600 m and 200 km/hr ground speed, a ground resolution element is 18 meters square. The data acquisition rate is 2.5 spectra per second of 500 channels each. Absolute radiometric calibration is achieved with a standard lamp that is calibrated against an NBS secondary standard source. The linearity of instrument response to intensity change is 1 percent. The rapid data acquisition in parallel input channels is essential for obtaining good quality spectral data at 2 nm or better wavelength resolution and high sensitivity under airborne operating conditions. These data have yielded spectral information valuable to basic remote sensing research in the areas of detecting geologic zones of alteration, monitoring the condition of vegetation canopies, and determining the spectral properties of water bodies. /Author/

16 citations


Journal ArticleDOI
TL;DR: 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, which allows an application in scientific laboratories as well as in the routine quality control of electrochemical device production.
Abstract: 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.

15 citations


Journal ArticleDOI
D. W. Taylor1
TL;DR: A microprocessor-based programmable laboratory equipment controller and data acquisition system that can replace a minicomputer at a substantial cost reduction with no loss of performance is presented.
Abstract: A microprocessor‐based programmable laboratory equipment controller and data acquisition system is presented. In most instances, this system can replace a minicomputer at a substantial cost reduction with no loss of performance. The system hardware and a special purpose programming language, designed to provide good interaction between this system and other equipment, are described.

13 citations


Journal ArticleDOI
TL;DR: A multiple detector system for performing up to twenty-five simultaneous coincidence measurements is described, using a microcomputer to store data, control the experiment and perform elementary analysis.

12 citations


Journal ArticleDOI
TL;DR: In this paper, a minicomputer is used for on-line control of and data acquisition from the dosimetry system, which makes possible changes in the beam tune during dose mapping as is required in dynamic control of the momentum.
Abstract: The dosimeter used in a transmission ionisation chamber and as the measurement is by charge integration, the sensitivity is limited only by the total leakage current of the detector, signal cable and electrometer. A minicomputer is used for on-line control of and data acquisition from the dosimetry system. Computer control also makes possible changes in the beam tune during dose mapping as is required in dynamic control of the momentum. Continuous monitoring of all the beam line elements by the same minicomputer can result in terminated or rejected dosimetry in the case of component failure. Direct computer storage of the dose maps facilitates software manipulation of the data.

Journal ArticleDOI
TL;DR: In-line arrays for both source and receiver have been implemented for marine seismic reflection data acquisition as discussed by the authors, which are considerably greater than any previously used system of which we are aware, and attenuate extremely strong sea bottom multiples during the data acquisition phase.
Abstract: In‐line arrays for both source and receiver have been implemented for marine seismic reflection data acquisition The in‐line array dimensions (variable within limits) are considerably greater than any previously used system of which we are aware The arrays were designed to attenuate extremely strong sea‐bottom multiples during the data acquisition phase The source comprised 25 airguns arranged in five identical in‐line subarrays Each subarray produced a signal of better than 6 barmeters acoustic intensity with a primary‐to‐bubble ratio of approximately 44 from guns totaling 297 cu in When this source was delivered in 1973, it constituted the most powerful production airgun source for which we had seen calibration measurements Receiver arrays were implemented by a “weighting‐mixing” box (which formed part of the DFS IV instrument), the input to which comprised 53 channels of data each from a 50 m live section in the streamer cable Processing techniques which are complementary to the field procedure

Patent
28 Apr 1978
TL;DR: In this article, a computer that receives and stores bursts of high speed data from the digitized analog output of an infrared camera and simultaneously transfers a uniform flow of the data at a lower data rate to a digital tape recorder is realized.
Abstract: Direct, real time digital data recording of thermal imagery is realized by the utilization of a computer that receives and stores bursts of high speed data from the digitized analog output of an infrared camera and simultaneously transfers a uniform flow of the data at a lower data rate to a digital tape recorder. The computer receives data only during camera active scan periods but transfers data to the recorder continuously. By making the computer output data rate substantially equal to the average input data rate real time recording is achieved. Full utilization of the data handling capacities of both the computer and the lower speed recorder is accomplished by digitizing the camera output signals in 8 bit words, combining pairs of 8 bit words for 16 bit word processing in the computer and reconverting the computer output data to 8 bit words for recording by the digital tape recorder.

Journal ArticleDOI
TL;DR: In this article, the Fairchild 321 CCD has been used for high-energy physics experiments and measurements on linearity, noise, dark current and transfer inefficiency have been made.
Abstract: Analog memory charge-coupled devices (CCDs) have potential use in instrumentation for nuclear data acquisition, particularly for large detectors for high-energy physics experiments. Some measurements aimed at characterizing the Fairchild 321 for this application have been made. This includes measurements on linearity, noise, dark current and transfer inefficiency. The results are given together with the measurement techniques used.

Patent
22 Nov 1978
TL;DR: A data acquisition system utilizing a microcomputer and incorporating a plurality of monitors each adapted to produce an electrical signal indicative of a physical condition of apparatus to be monitored is described in this paper.
Abstract: A data acquisition system utilizing a microcomputer and incorporating a plurality of monitors each adapted to produce an electrical signal indicative of a physical condition of apparatus to be monitored. The electrical signals are fed via multiplexing equipment and analog-to-digital converters into the microcomputer which is equipped with print-out means. The system is such that the level of any one or all of the signals from the respective monitors can be printed out as well as a change in the condition of any signal. Means are incorporated into the computer for calculating and printing the trend (i.e., the slope of a plot of signal amplitude versus time) of a succession of stored signals from any monitor which would indicate a probable malfunction of a device being monitored and the probable time to failure. In the case where the signals from the monitors comprise vibration signals, the system performs an automatic frequency spectrum analysis whenever a probable or actual malfunction is detected.

01 Jan 1978
TL;DR: The system configuration makes use of a microcomputer at the test site which acts as a communications multiplexer between the measurement and display devices and a centrally located minicomputer.
Abstract: Primarily designed to acquire data at steady state test conditions, the system can also monitor slow transients such as those generated in moving to a new test condition. The system configuration makes use of a microcomputer at the test site which acts as a communications multiplexer between the measurement and display devices and a centrally located minicomputer. A variety of measurement and display devices are supported using a modular approach. This allows each system to be configured with the proper combination of devices to meet the specific test requirements, while still leaving the option to add special interfaces when needed. Centralization of the minicomputer improves utilization through sharing. The creation of a pool of minis to provide data acquisition and display services to a variable number of running tests also offers other important advantages.

Journal ArticleDOI
TL;DR: This system digitally processes uninterrupted, continuous unit data with attention to waveform detail with a great economy of the user's time because the computer performs all data processing.

Journal ArticleDOI
TL;DR: An on-line data acquisition system for monitoring high-resolution multidimensional spectra within the memory confines of a small computer is described in this paper, where the system has been applied in a study of 128 I states produced by the (p, n, γ-γ) reaction.

Journal ArticleDOI
R. Kouzes1
TL;DR: The program ACQUIRE is a highly flexible acquisition code able to support diverse experimental requirements and yet capable of sorting a repetitious pulser in a single ADC at up to 40 kHz without loss.

Journal ArticleDOI
TL;DR: Microcomputers, operating as satellite processors in a UNIX∗ system, are at work in the laboratory collecting data, controlling apparatus and machinery, and analyzing results.
Abstract: Microcomputers, operating as satellite processors in a UNIX∗ system, are at work in our laboratory collecting data, controlling apparatus and machinery, and analyzing results. The system combines the benefits of low-cost hardware and sophisticated UNIX software. Software tools have been developed that accomplish timing and synchronization; data acquisition, storage, and archiving; command signal generation; and on-line interaction with the operator. Mechanical testing, magnetic measurements, and collecting and analyzing data from low-temperature convective studies are now routine. The system configurations used and the benefits derived are discussed.

Journal ArticleDOI
TL;DR: JET - The Joint European Torus - will be a major step in the European Community's fusion program to obtain and study a plasma in conditions and dimensions approaching those needed in a thermonuclear reactor.
Abstract: JET - The Joint European Torus - will be a major step in the European Community's fusion program. The principal objective of the experiment is to obtain and study a plasma in conditions and dimensions approaching those needed in a thermonuclear reactor. The size and complexity of the experiment demands an integrated computerized control and data acquisition system. CODAS comprises machine monitoring and control, acquisition of plasma and machine data, data analysis and storage. It is divided into several almost self contained subsystems, each of which is controlled and serviced by a minicomputer. The various local units of each subsystem are interfaced through CAMAC. The communication between the centralized control and the subsystems is obtained through 3 communication paths, the computer communication, the timing and the interlock system. The experiment as a whole is operated from two consoles, the machine console and the experiment console. One computer with large storage capacity is foreseen for the filing of all data, for automatic data processing between two pulses and for further analysis programs.

Journal ArticleDOI
R. S. Larsen1
TL;DR: This paper is a brief summary of current activity on the development of a new standard system, now known as "FAST-BUS," which would have as principal features improved speed by a factor of 10 over CAMAC.
Abstract: In late 1975 the US NIM Committee initiated a study group, known as the Advanced System Study Group, to review the future data acquisition modular interface requirements for high energy physics. The final report1 of this group recommended the development of a new standard system, now known as "FAST-BUS," which would have as principal features improved speed by a factor of 10 over CAMAC; more generalized architecture to accommodate distributed parallel processing and fast pre-processing; special scan modes of particular use in high energy particle detection systems; and standardized bus structures and mechanics. This paper is a brief summary of current activity.

Journal ArticleDOI
TL;DR: A first-order predictor routine and an encoding routine were implemented on an Intel-8080-based microprocessor system to determine their ability to compress seismic data and it appears that higher order predictors offer no significant advantage over the first- order predictor in compressing seismic data.
Abstract: A first-order predictor routine and an encoding routine were implemented on an Intel-8080-based microprocessor system to determine their ability to compress seismic data. The predictor routine obtained a maximum compression ratio of 2.33. It appears that higher order predictors offer no significant advantage over the first-order predictor in compressing seismic data. The encoder routine obtained a larger compression ratio of 3.94. The accuracy of reconstructed seismic traces is bounded by a maximum average error per point. For the predictor, the maximum average error per point is shown to be equal to the specified user tolerance. For the encoder, it is shown to be proportional to the maximum quantization error associated with the ranges used in the encoding algorithm. In general, the average error per point is found to be equal to the square root of the mean-squared error regardless of the compression technique used. A design for a basic data acquisition system utilizing data compression to reduce memory requirements is proposed. Examination of the design indicates that such a system can process no more than three separate data channels at a 1-ms sampling rate and that such a system is cost effective only when small numbers of data channels are to be processed.

Journal ArticleDOI
TL;DR: A system based on commercially available modular integrators and a hobbyist microcomputer which performs the averaging and ratioing digitally is described, which is equal to or better than that of fully analog systems.
Abstract: Pulsed laser systems produce spectroscopic signals with large shot-to-shot variations, short durations, and low duty cycles. The most satisfactory signal processing system is gated integration, with pulse averaging and ratioing to a reference signal. We describe a system based on commercially available modular integrators and a hobbyist microcomputer which performs the averaging and ratioing digitally. System performance is equal to or better than that of fully analog systems, while the cost is low and construction is straightforward.

Journal ArticleDOI
S.L. Hager1
TL;DR: A software package is described that has been developed for use with a DEC PDP 11/40 computer system, which eliminates nearly all of the hand calculations and plotting that are normally encountered for DSC, TG, TMA and evolved gas techniques (TEA, TGC).

Proceedings ArticleDOI
01 Feb 1978
TL;DR: The In Vehicle Microcomputer System meets the design goals of multi-channel inputs, self-contained signal conditioning with completely interchangeable, channel by channel measurement function flexibility, a selectable frequency capability, recording capacity for at least six months of unattended use, and good packaging and pricing.
Abstract: A microcomputer-based, eight-channel data acquisition system is described for customer correlation and routine vehicle field testing applications. The In Vehicle Microcomputer System meets the design goals of multi-channel inputs, self-contained signal conditioning with completely interchangeable, channel by channel measurement function flexibility, a selectable frequency capability of at least DC to 50 cps, recording capacity for at least six months of unattended use, and good packaging and pricing. Calibration, signal gain, and channel zero offset adjustments can be performed under software control. The microcomputer system is based on a Motorola M6800 microprocessor and a nonvolatile core memory module. The design, development, field performance, and data processing characteristics of the system are described, including specific automotive applications (e.g. transmission data acquisition) and field test results. The system can be used for extended statistical recording of various vehicle functions in the customer's environment. It provides for program, control, and signal conditioning flexibility and has many applications.

Proceedings ArticleDOI
15 Dec 1978
TL;DR: A test program to evaluate laser gyros for Air Force applications is described in this article, where the authors present a test plan and actual test results obtained at the Charles Stark Draper Laboratory, Inc. on a mechancially dithered laser gyro.
Abstract: A test program to evaluate laser gyros for Air Force applications is described. The test plan development, facilities and actual test results obtained at the Charles Stark Draper Laboratory, Inc. on a mechancially dithered laser gyro are presented. The test plan addresses methods to evaluate a laser gyro's bias and scale factor under various environments and operational modes. The test techniques are designed for use with: a mini-computer for on-line data analysis and test control, a thermal chamber mounted on an air-bearing table which allows performance evaluation with temperature profile testing, and a data acquisition system for recording available analog voltages for subsequent correlation analyses. Future test plans and additional areas for evaluation are also discussed.© (1978) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Journal ArticleDOI
TL;DR: Computer-based systems for the acquistion and treatment of data from flash photolysis, laserphotolysis and pulse radiolysis experiments are described, and the advantages of a computer-based system over a manual system discussed.

Proceedings ArticleDOI
28 Nov 1978
TL;DR: A Vehicle Monitoring System (VMS) based on the RCA 1802 microprocessor, was developed for recording the use, condi tion, and maintenance action experienced by military vehicles in their day-to-day operation.
Abstract: A Vehicle Monitoring System (VMS) based on the RCA 1802 microprocessor, was de veloped for recording the use, condi tion, and maintenance action experienced by military vehicles in their day-to-day operation. Data are collected over a period of up to one month by an unat tended on-board monitoring unit and are stored in a highly compacted digital form for later analysis. A multi-task ing operating system enables the real time monitoring of 18 digital and 25 analog parameters. Data predefined as "non-significant" are discarded, while significant data are saved in a 15-k byte storage area in the form of both detailed profiles and summary indicators and histograms. Retrieval of data is accomplished through the use of an off board cassette unit which can also be used to modify the control software of the monitoring unit. The data can then be analyzed by an off-line computer system to extract information relating to vehicle design and performance, effectiveness of maintenance programs, and causes or precursors of vehicle component failures.

Journal ArticleDOI
TL;DR: Software architecture which leads to feasible distributed system error recovery is discussed, including atomic transactions, intention lists, and controlled data sets.