Showing papers on "Data acquisition published in 1979"

A double scanning microphotometer for image analysis: hardware, software and biomedical applications.

Abstract: A new image processing system designed for densitometry and pattern analysis of microscopic specimens is described with special regard to the hardware, the software and the biologic applications. The data acquisition procedure involves the combination between the scanning of the preparation by means of a motorized stage and the scanning of successive fields by a mechanical device. The signal provided by the photomultiplier is converted into digital values which are directed to an on-line computer. The data processing is based on a one-pass computation involving automata theory and therefore it avoids the storage of the image in the computer memory. In so doing, an entire and continuous image of the whole preparation can be processed at the highest magnification of the microscope whatever the size of the analyzed specimen may be. A biologic application of the system is reported and concerns the automatic identification and counting of cells in the various phases of the mitotic cycle.

Real‐time data acquisition and interpretation capabilities of the Dynasonde: 1. Data acquisition and real‐time display

Abstract: Dynasonde software for data acquisition in three modes is described. The ‘I’ mode corresponds to an ionogram format but includes complete echo polarization and angle-of-arrival information. K mode provides time series and high time resolution at freely selected sounding frequencies. B mode combines features of the other two modes. All share a real-time noise rejection method which is described statistically. The system includes a digitally driven CRT (cathode ray tube) display and a variety of display formats for real time or deferred examination of data; in particular, dynamic time-lapse displays of ionospheric activity can be maintained by the Dynasonde.

Multiband radiometer for field research

Abstract: A multiband radiometer for field research with 8 bands between 0.4 and 12.5 micrometers is described. The data acquisition system will record the results from the radiometer, a precision radiation thermometer, and ancillary sources. The radiometer and data handling systems will be adaptable to helicopter, truck, to tripod platforms; the system will also be suitable for portable hand-held operation. The general characteristics of this system are that it will be (1) inexpensive to acquire, maintain, and operate, (2) simple to calibrate, (3) complete with data handling hardware and software, and (4) well-documented for use by researchers.

Range selectable contactless data acquisition system for rotating machinery

Abstract: A multichannel data acquisition system for physical measurements on rotating members of operating machinery avoids slip rings and radio telemetry for data transfer by providing a capacitive coupling link between rotating and stationary members. Electronic circuitry mounted on the rotating member provides a pulse-code modulated signal containing the measured information for transmission through the capacitive coupling link. Power required to operate the rotating circuitry is inductively coupled from a stationary high-frequency source. The rotating circuitry includes a digital counter whose count is incremented by a momentary power interruption and whose digital output corresponds to a particular measuring range, allowing a range selection to be made during machinery operation.

Engineering Aspects of PETT VI

Abstract: PETT VI is a circular ring, multislice positron emission tomograph designed for small field studies. Features such as wobble and rotate motions, bimodal resolution, cesium flouride scintillators, fast timing circuits and dual buffer histogram memories allow a flexible data acquisition environment. Efficient modularized software concepts are implemented to facilitate concurrent tasks of data acquisition, processing and display. The ability to effectively manage high count rate situations and collect continuous time frames makes PETT VI ideally suited for dynamic studies.

The Design and Test of a Digital Relay for Transformer Protection

Abstract: The inrush current-detection algorithm for the protection of transformers presented in [3] was coupled with a differential overcurrent algorithm and implemented on a popular eight-bit microcomputer system. Multiplication and division was avoided, enabling the use of relatively low-cost processing hardware. A hardware model centered around a transformer generated current data for the data acquisition system. This system translated the time-continuous analog data into the time-discrete digital input data for the algorithms resident in the microcomputer. The algorithms, operating in real time, provided outputs correctly, indicating the presence of either inrush, fault, or low differential current conditions.

A data acquisition and control system based on the new Commodore PET microcomputer

Abstract: A powerful data acquisition and control system at a very low cost is presented. This is made possible by providing the interfacing hardware and supporting software to integrate the new and low‐cost consumer‐marketed ’’personal computers’’ into a useful and powerful data acquisition system. This system can be configured to the user’s need at any given time, simply by writing the appropriate software. In addition to its computing power, the system has been programmed for use as a transient digitizer–multichannel analyzer with a minimum of 12 μsec per channel, a data and curve fitter, a general x‐y recorder and averager, and a general purpose lab equipment controller. The system developed is, in many respects, at least as powerful as a DEC‐PDP 11/04 system—at a small fraction of the cost.

RT/RSX MULTI: Packages for Data Acquisition and Analysis in High-Energy Physics

Abstract: The MULTI system is a software package for data acquisition, data analysis, and experiment control. PDP-11 implementations are in widespread use under the RT-11 and RSX-1lM operating systems at Fermilab and elsewhere. The system philosophy, architecture, and significant features are discussed, and the measured performance is reported.

Novel computer-based infrared pedestrian data-acquisition system

Abstract: The design and evaluation of an inexpensive, reliable and flexible computer-aided pedestrian data-acquisition system, capable of automatically gathering and processing information, are described. The detection of pedestrians by a unique method employing infrared techniques is also discussed.

Wind tunnel real-time data acquisition system

Abstract: The hardware configuration is described for the data acquisition system (DAS) which consists of an analog front end that can process up to 260 channels of data, a multichannel analog-to-digital subsystem that can process up to 50,000 samples of data per second, and a digital computer with standard and nonstandard devices, including graphics capability. Also described are the software configuration of the DAS and complex hardware/software interfaces providing, for example, automatic amplifier gain and offset adjustment for each data channel. Specific DAS applications are summarized, including the real time processing of dynamic deflection data, unsteady pressure measurements, and flutter and buffet data.

Microprocessor controlled digital detector

Abstract: of the Disclosure In the digital detector the center frequency and bandwidth of a digital filter is controlled by a microprocessor. Amplitude information for the original input signal may be preserved or a simple threshold of energy may be detected within a bandpass. The microprocessor scans a selected frequency spectrum by digitally changing the decoding data controlled by software. This detector in conjunction with a scanning algorithm permits data acquisition in addition to energy detection, data acquisition being the process of controlling an incoming signal within a bandpass by moving the center frequency and band-pass of the filter and generating a corresponding error signal as the feedback control signal.

An On-Line Data Reduction System for Photon Correlation Laser Anemometry

Abstract: Photon correlation techniques have proved extremely powerful in obtaining laser anemometry data under difficult experimental conditions, especially when the scattered light levels are extremely low, but further processing is necessary to obtain explicit information about the velocity distribution in the measurement region. In this paper the various procedures based on the Fourier transform which have been developed at the Royal Aircraft Establishment in the course of a series of experiments on many types of flow, both subsonic and supersonic, will be described. In addition details of an integrated on-line data acquisition and reduction system comprising a digital correlator and a minicomputer and which is capable of yielding estimates of mean velocity and turbulence intensity will be presented. The important design features of the system will be discussed and examples of its performance in recent experiments will be given.

A Distributed Processing Data Acquisition System at Brookhaven National Laboratory

Abstract: The Tandem Van de Graaff at BNL has been using a computerized data acquisition system for more than eight years. A brief history of its philosophy and performance will be discussed. Also to be presented is the new data collection system which is designed around a high-speed bus with multiple processors. This new system is capable of handling event rates of over 200 kHz for add-one to memory (PHA) type spectra totalling 512k channels. List-mode, special sorting involving gating, or arithmetic operations of the data are supported in addition to one or two parameter PHA types. The system allows eight configurations of eight devices to be defined by the user. The devices are typically analog-to-digital converters (ADCs), multi-channel scalers, or routing devices. However any device with digital information could be interfaced.

The Event Handler II a Fast, Programmable, CAMAC-Coupled Data Acquisition Interface

Abstract: The purpose of this paper is to describe the architecture and performance of the Event Handler, a fast, programmable data acquisition interface which is linked to and through CAMAC. The special features of this interface make it a powerful tool in implementing data acquisition systems for experiments in nuclear physics.

Fast data acquisition system for cash desk computer - has autonomous portable data acquisition units connectable to computer for data transfer

Abstract: The data acquisition system has data acquisition devices acquiring data regarding stores materials and passing them to the computer for processing. The acquisition devices are each located in an acquisition unit that can be disconnected from the computer. Data relating to the materials are stored in a memory located in the disconnectable autonomous and portable data acquisition unit. This data can be transferred to the comparator when the acquisition unit is connected to the computer. The materials data is stored by connecting the price generator and the acquisition unit. This data connection is accomplished with a data transfer unit that also connects the acquisition unit to the computer.

A computer-controlled ENDOR spectrometer

Abstract: The computer governs the whole measurement process including frequency generation through a slave synthesiser, data acquisition and data handling. The radio frequency signal is amplitude-modulated. Some constructional details are given and the program, written in assembler language, is described.

Computer signal processing for ultrasonic attenuation and velocity measurements for material property characterizations

Abstract: Instrumentation and computer programming concepts that were developed for ultrasonic materials characterization are described. Methods that facilitate velocity and attenuation measurements are outlined. The apparatus described is based on a broadband, buffered contact probe using a pulse-echo approach for simultaneously measuring velocity and attenuation. Instrumentation, specimen condition, and signal acquisition and acceptance criteria are discussed. Typical results with some representative materials are presented.

Data Acquisition and Analysis System for the Holifield Heavy Ion Research Facility

Abstract: The Holifield Heavy Ion Research Facility is a national resource which will serve a large number of nuclear and atomic physicists who expect to perform experiments which vary widely in type and complexity. Although much consideration must be given to the problem of rapid acquisition and processing of many-parameter data, an equal emphasis will be placed on operational simplicity and the standardization of hardware and software. Two "active" experimental counting areas and two or more "setup" areas are served by three remotely located Perkin-Elmer 8/32 computers which are interfaced to the user equipment by means of three CAMAC branch highways. Other equipment includes a large disk system, alphanumeric/graphic terminals and printer-plotters located in each of the counting areas. The system operation as well as techniques for the rapid sorting of data into large (~ 10 million channels) histograms on disk are discussed.

An Experimental Data Acquisition System for Ultrasound Imaging

Abstract: An experimental digital data acquisition system for computerized ultrasound imaging studies is developed. The system requirements for the digital reconstruction of tomographic images from the envelope of ultrasound signals of several megahertz are described. To effectively digitize ultrasound signals, a new digital averager is implemented. Several consecutive ultrasound signals are averaged on a real-time base to enhance the signal-to-noise ratio, to reduce the volume of the data, and to achieve a match of data flow rates between the ultrasound signals and the usual computer input devices. The positions of the ultrasound transducers and the target are controlled by a microprocessor controller. These positions are sensed and also digitized by the averager. The averager transfers the digitized data, both the ultrasound signals and position signals, to a general-purpose computer for further data processing. Experimental data on reconstructing the cross section of a simple target from the ultrasound signals acquired by this system will be presented as an illustration.