By Topic

[1992] Conference Record IEEE Instrumentation and Measurement Technology Conference

12-14 May 1992

Filter Results

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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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
  • Towards distributed control systems for experiments under microgravity

    Publication Year: 1992, Page(s):320 - 325
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Experimental control systems for microgravity research have been developed, based on a control concept that relies heavily on software for its functions: data acquisition, actuator control, data storage, experimental scenario execution, and communication with a personal computer (PC) system for test and checkout. A second-generation system is being developed with provisions for distributed control... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive filtering for bandlimited noise using an error backpropagation neural network

    Publication Year: 1992, Page(s):508 - 511
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Standard noise filtering schemes are often inadequate for eliminating noise energy without seriously distorting the desired signal. As an extension of previous work (see IEEE Trans. Instr. and Meas., vol.40, pp.820-825, 1991) the authors demonstrate the use of a feedforward backpropagation error correction neural network for the filtering of absorption spectra exhibiting the effects of bandlimited... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Investigations and measurements of the dynamic performance of high speed ADCs

    Publication Year: 1992, Page(s):280 - 284
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Investigations concerning the origin of the aperture jitter in a 4-b parallel analog-to-digital converter (ADC) implemented in a 0.5-μm GaAs FET technology have been undertaken. On-chip electron-beam measurements of the comparator clock distribution show a deviation of 20 ps between the comparators. Simulation considering process variations shows similar results. To overcome these problems, a G... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The study of SRPM method for a short-length rod-shaped sample

    Publication Year: 1992, Page(s):326 - 329
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A method for estimating the resistivity of a short rod-shaped sample conductor is investigated. The resistivity is estimated by using both the measured value of the difference in complex impedance of a solenoid coil with and without the sample conductor inside it (SRPM method) and the same value calculated by the finite-element method. The discrepancy between the values of resistivity estimated by... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Acquisition of electrosurgical data using the IEEE-488

    Publication Year: 1992, Page(s):512 - 513
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    Electrosurgery uses high-frequency current (0.5-2.5 MHz) to create an electric arc that cuts and coagulates tissue. The arc's parameters are virtually unknown and it is possible that the electrosurgical arc is the source of a large number of hazards reported in the operating room. A study has been undertaken which examines the output voltage and current characteristics of the electrical arc. Using... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Noncontacting low-cost instrument for film thickness measurement

    Publication Year: 1992, Page(s):350 - 355
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The authors present a noncontact, nondestructive technique for measuring the thickness of thin liquid or solid films and coatings in real time by utilizing the resonance properties of microstrip structures based upon the work of Hurley, Kaufman, and Roy (see Review of Scientific Instruments, 61, Sept. 1990). This work is extended by confining all microwave aspects of the system internal to the ins... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A/D converter performance analysis by a frequency domain approach

    Publication Year: 1992, Page(s):285 - 289
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    An analysis of the frequency domain approach in the test of analog-to-digital convertors (ADCs) is presented. Following the introduction of a spectral analysis algorithm based on the use of windows with minimum sidelobe energy, expressions are given to determine ADC performance parameters. Corrections are introduced to improve accuracy in practical cases, and simulation results are presented to su... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The measurement of the relative density of homogeneous fluids by means of an optical technique

    Publication Year: 1992, Page(s):330 - 334
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A sensor that uses an intensity modulated optical method to measure the relative density of homogeneous fluids is described. An optical fiber is used in a special way as a refractometer to measure the index of refraction. The method relies on the optical power loss exhibited by a fiber bent beyond a critical radius. For such a fiber the critical angle of reflection is a function of the density of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Method of moments in light scattering data inversion in the particle size distribution function

    Publication Year: 1992, Page(s):485 - 488
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A connection between algebraic functions of the angle of scattering and integral parameters of particle size distribution is shown on the basis of measurement methods in which scattering at a small angle is fundamental. The particle size distribution can be obtained by the direct inversion of light scattering data, without presupposing a form for the distribution function. Measurements using instr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Classical and parametric spectral analysis instrument using a visual programming language

    Publication Year: 1992, Page(s):533 - 538
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Tube leak detection in fossil-fueled power plant boilers has traditionally used classical power spectral density estimates based on fast Fourier transform methods. This approach has achieved mixed results due to the complex signal environment present in the boiler. The authors compare the results of classical techniques with another approach based on parametric power spectral estimation methods. I... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optoelectronical identification of glass characteristics

    Publication Year: 1992, Page(s):356 - 360
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Selected algorithms and application problems connected with identification methods for glass strength behavior are reported. Contactless objective image processing procedures for smart metrical measurements of break cones within glass probes are described. Technologies for the modeling of mechanical edges by optical images and for statistical edge detection with pixel resolution are presented. Spe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Practical considerations in the design of multisine test signals for system identification

    Publication Year: 1992, Page(s):174 - 179
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The design of nonbinary multifrequency excitation signals for system identification is examined. The performance of such signals in parametric time-domain estimation and nonparametric frequency-domain estimation for noisy and nonlinear systems is assessed, and a comparison with the maximum length binary sequence is made. A nonbinary multifrequency signal composed of prime harmonics is proposed for... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wideband distortion compensation for bipolar flash analog-to-digital converters

    Publication Year: 1992, Page(s):290 - 294
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Phase analog compensation (PPC) was applied to a bipolar flash analog-to-digital converter (ADC). PPC parameters were set by analyses of flash ADC error sources and of PPC operation. It is shown that phase plane compensation effectively compensates the nonlinear error sources of the tested ADC, lowering the estimated distortion floor by 11 dB for a full-scale ADC input range (2 V) and wide (40 MHz... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 30-1000 MHz field strength standard developed in anechoic chamber

    Publication Year: 1992, Page(s):335 - 338
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    An accurate electric field strength standard for the frequency range from 30 MHz to 1 GHz has been developed in a full anechoic chamber with one sigma uncertainty less than ±1.9%. Reflected waves from the ceiling, floor, and walls of the chamber at frequencies at 30 MHz to 200 MHz have been estimated experimentally, and the error due to these waves has been compensated in the standard and t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic calibration of measurement channels using algorithms of nondifferentiable optimization

    Publication Year: 1992, Page(s):518 - 522
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The problem of dynamic calibration of measurement channels is considered under an assumption that the relationship between the measurand and the raw result of measurement is adequately modeled by a linear, fixed-parameter difference equation. The parameters of this model are estimated on the basis of the reference data using an algorithm of nondifferentiable optimization and the criterion of the q... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Continuous measurement of moisture in nonconducting materials

    Publication Year: 1992, Page(s):419 - 421
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A microwave-based system has been developed for the continuous measurement of the moisture in nonconducting materials. The system was implemented on conveyor belts carrying coarse coal. To obtain a reliable measurement for this application, several other factors that influence the microwave technique were investigated. These factors are the mass per unit area, the ash content, and the temperature.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A versatile and accurate 300 MHz time generation circuit

    Publication Year: 1992, Page(s):233 - 237
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A 300-MHz timing generator has been designed and implemented on a digital application-specific integrated circuit (ASIC) platform to act as the fundamental circuit block of a pulse generator. Within this circuit block, all pulse generator timing functions, such as period generation, delay generation, and width generation, have been provided. The circuit implements the various trigger and logic fun... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A scheme for data collection from unattended instruments by a personal computer

    Publication Year: 1992, Page(s):612 - 615
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The collection of field data relating to the growth of plants, using unattended instruments over long periods of time, is discussed, and the hardware and software are described. A single channel of FM telemetry is employed to facilitate data collection by a personal computer located at some distance. A low-power microcontroller with provision for low power is used. Resident software periodically c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.