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[1992] Conference Record IEEE Instrumentation and Measurement Technology Conference

12-14 May 1992

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Displaying Results 1 - 25 of 142
  • Recursive random sampling strategy for a digital wattmeter

    Publication Year: 1992, Page(s):577 - 582
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    A recursive random sampling strategy is proposed for the implementation of a digital broadband wattmeter. In this strategy each sampling instant is obtained by adding a prefixed constant lag plus a random increment to the preceding one. The formula for the evaluation, in terms of accuracy and bandwidth of errors arising from the sampling strategy and the filtering algorithms, is given and discusse... View full abstract»

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  • An undergraduate laboratory experiment of 35 years ago whose time has yet to come

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (71 KB)

    Summary form only given. An experiment on probability for undergraduate electrical engineering students was devised in 1958, and was met with wide acceptance at the time. It was later realized that the principle employed might find application in the area of precision AC-to-DC transfer instrumentation for the measurement of fluctuating voltage. Since precision transfer devices are still largely an... View full abstract»

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  • IMTC '92. IEEE Instrumentation and Measurement Technology Conference (Cat. No.92CH3151-8)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (31 KB)
    Freely Available from IEEE
  • An automated knowledge acquisition system for model-based diagnostics

    Publication Year: 1992, Page(s):668 - 674
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    It is shown how knowledge acquisition can improve the design, production, and testing of complex electronic, mechanical, and hydraulic systems. A method for automating knowledge acquisition and integrating it into the design process is discussed. The author presents NASA's CAD/CAE Knowledge Base Development Tool (KBDT) as a prototype for demonstrating the concept of automated knowledge acquisition... View full abstract»

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  • Application of logistic regression for fault analysis in an industrial printing process

    Publication Year: 1992, Page(s):675 - 680
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A statistical technique for fault analysis in industrial printing is reported. The method specifically deals with binary data, for which the results of the production process fall into two categories, rejected or accepted. The method is referred to as logistic regression, and is capable of predicting future fault occurrences by the analysis of current measurements from machine parts sensors. Indiv... View full abstract»

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  • Neurospectra-a neural network model for spectral estimation

    Publication Year: 1992, Page(s):681 - 685
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    An artificial neural network (ANN) model for spectral estimation is presented. The objective is to reduce the lengthy knowledge acquisition process in expert systems by using the supervised learning process of the ANN. The design of the spectral estimation system and the corresponding training system are presented. The implementation of the spectral estimator is realized using programs in conventi... View full abstract»

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  • Casting a crystal ball on the future of process instrumentation and process measurements

    Publication Year: 1992, Page(s):687 - 691
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    It is noted that the technologies, as well as the hardware and software components, for implementing process management, maintenance management and process control in real time are available now. It is argued that the evolution of the concept will be accelerated as soon as a standard (preferably an international standard) has been established for the Fieldbus because then the components for the va... View full abstract»

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  • Techniques for monitoring the condition of turbine flowmeters

    Publication Year: 1992, Page(s):692 - 696
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Turbine flowmeters are frequently applied for accurate measurements of process fluids for batching, accounting, and custody transfer, for which metering errors due to degradation in instrument performance are very significant. Early detection of changes in the condition of the instrument is important. Studies have shown that signal processing methods can be applied to detect the incipience of malf... View full abstract»

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  • Signal analysis applied to vortex flowmeters

    Publication Year: 1992, Page(s):697 - 701
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Vortex flowmeters are applied to the measurement of fluid flows where instruments with no moving parts and with wide rangeability are required. Process conditions influence the operation of a vortex flowmeter and fluctuations in the flow affect the complex phenomenon of vortex street formation. In the present study the signal taken directly from the sensor employed in an industrial vortex flowmete... View full abstract»

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  • Identification methods for dynamic model of measurement systems

    Publication Year: 1992, Page(s):703 - 708
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Three kinds of identification methods for dynamic mathematical models of transducers and measurement systems are established: identification in the time domain, which is convenient for dynamic calibration in the time domain; identification in the frequency domain, which is used for dynamic calibration in the frequency domain; and a correlation least-squares method for identification of a closed-lo... View full abstract»

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  • PVDE-ultrasound transducer arrays with a reduced number of elements using matched receiver arrays

    Publication Year: 1992, Page(s):59 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A combination of transmitting and receiving ultrasound arrays is presented and analyzed. The arrays are composed of polyvinylidene-fluoride (PVDF)-membrane transducers, a new type of transducer well suited for applications in low-impedance media like air. PVDF transducers offer a broadband impulse response. Computer simulations, as well as measured characteristics, are presented and show the effec... View full abstract»

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  • Identification of the constitutive equations for linear viscoelastic composite materials

    Publication Year: 1992, Page(s):709 - 715
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The constitutive equations for linear viscoelastic materials are experimentally verified. The generalized Hooke's law, which gives a frequency-dependent relationship between the stress and the strain, is modeled using a parametric transfer function model. The parameters of the proposed rational transfer function are estimated from forced vibration experiments. Instead of using the classical steppe... View full abstract»

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  • Multisensor system for diagnosing machine tools

    Publication Year: 1992, Page(s):194 - 199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The hardware structure of a custom-designed multisensor computer system for diagnosing various functions of machine tools is presented. Measurement algorithms that assure high flexibility in configuring complex measurement lines, designing measurement strategies, and displaying the results are given. Problems which concern the determination of diagnostic standards are reported. The application of ... View full abstract»

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  • Implementation of an intelligent instrument for passive recognition and two-dimensional location estimation of acoustic targets

    Publication Year: 1992, Page(s):66 - 70
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    An intelligent instrument for passive recognition and location of a sound source is presented. The performance of this instrument is studied in an anechoic chamber. The necessary software and hardware implementation is explained. Very fast hardware is used to achieve real-time processing. Timing is a critical parameter of system performance. Some advanced software techniques are used for the detec... View full abstract»

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  • Review of downhole production logging instrumentation

    Publication Year: 1992, Page(s):201 - 207
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    State-of-the-art production logging instrumentation used to delineate downhole flow rate and fluid composition for two and three phase oil/water/gas wells is described. Various sensors are described, and the advantages and limitations of different tools are enumerated. The use of radioactive tracer flowmeters in injection and production wells is discussed. Classical techniques for interpretation o... View full abstract»

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  • Curve-fitting method for transfer function determination

    Publication Year: 1992, Page(s):71 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A curve-fitting method for determination of transfer functions by frequency sweep analysis is established. The method uses linearization of the modeled signals by use of a Taylors series and minimization of the error between the estimated and the measured values by the least-squares method. It is found that the transfer function determined by this method is more certain and stable than it would be... View full abstract»

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  • Quantization effects when testing differential gain

    Publication Year: 1992, Page(s):366 - 368
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The quantization effects introduced by analog-to-digital converters into differential gain measurement has been shown to be a possible cause of nonrepeatable measurements. This nonrepeatability has potentially negative effects in a production environment. The dependence of measurement error on converter resolution and DC input level is analyzed. An algorithm using Fourier analysis to compensate fo... View full abstract»

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  • Image formation from severely undersampled scalar infrared data sets

    Publication Year: 1992, Page(s):208 - 213
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The author describes the formation of an image from no more than ten (and usually fewer) scalar sensor readings. An infrared (IR) signal source is assumed, placing unusual demands on signal estimation and image construction algorithms. An onion-growth image construction algorithm that generates a single binary image object consistent with sensor measurements is presented. It is so called because i... View full abstract»

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  • Visual position recovery for an automated guided vehicle

    Publication Year: 1992, Page(s):305 - 309
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors present a visual method which allows an automated guide vehicle to recover its absolute position anywhere on a guide path represented by a pseudorandom binary sequence whose terms are marked as distinct graphical symbols. An onboard image processing system recognizes these symbols and recovers the pseudorandom code identifying the position. An experimental vision system using a charge-... View full abstract»

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  • An instrument for concurrent program flow monitoring in microprocessor based systems

    Publication Year: 1992, Page(s):169 - 172
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The activity of a microprocessor system can be altered by random failures due to dynamic hardware faults or unforeseen software errors that cannot be detected by common automatic test (ATE) or built-in self-test (BIST) offline systems. The authors describe a method for the detection of a particular class of such faults. This method is based on a monitoring strategy that surveys online the correctn... View full abstract»

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  • Reducing noise in a sampled voltage tracker

    Publication Year: 1992, Page(s):442 - 444
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    A brief history of voltage trackers, sampling voltage trackers, and sampled voltage trackers with integrator feedback is presented. Included are the important attributes of each circuit topology and the techniques (i.e., mean estimation and median estimation) that are employed to reduce noise. Two noise improvements made to the sampling voltage tracker are discussed. These are the addition of a sp... View full abstract»

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  • A real time controlled large-gap magnetic suspension using one-dimensional position measurement

    Publication Year: 1992, Page(s):75 - 79
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A contact image sensor is used as the position sensor for real-time control of a magnetic suspension system. The system contains a line light source and a linear photosensor array. The object to be measured is suspended between the light source and the sensor array. It acts as a mask to shade and shape of the light reaching the sensor array. No advanced optical system for light focusing and calibr... View full abstract»

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  • Automatic characterization and modeling of microwave low noise HEMTs

    Publication Year: 1992, Page(s):385 - 388
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    An automated measuring system is presented which allows the simultaneous characterization of microwave transistors in terms of noise and scattering parameters by means of noise figure measurements only. Very low time consumption, repeatability and accuracy characterize the system. The setup is driven by original software which selects the best measuring conditions for accuracy and performs the mea... View full abstract»

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  • Surface roughness measurement with optical fibers

    Publication Year: 1992, Page(s):489 - 493
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A method of surface roughness measurement utilizing polarization-maintaining optical fibers is presented. The method, which is based on polarization changes in light scattered from the measured rough surface, is compared with intensity-based fiber-optic surface roughness measurement and correlated with some parameters. For intensity-based measurement, a three-branch optical fiber cable is used in ... View full abstract»

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  • Testing the performance of delta-sigma ADCs

    Publication Year: 1992, Page(s):514 - 517
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Available test techniques and their suitability for testing delta-sigma analog-to-digital converters (ADCs) are reviewed. Two commonly-used dynamic tests, sine-wave curve fitting and discrete finite Fourier transform analysis, are discussed in some detail. It is noted that conventional ADC performance measures such as peak error and integral and differential nonlinearity are not readily applicable... View full abstract»

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