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6th IEEE Conference Record., Instrumentation and Measurement Technology Conference

25-27 April 1989

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Displaying Results 1 - 25 of 114
  • Conference Record. IEEE Instrumentation and Measurement Technology Conference (Cat. No.89CH2707-8)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (101 KB)
    Freely Available from IEEE
  • A new method of measuring standing wave distributions on electromagnetic waveguiding structures

    Publication Year: 1989, Page(s):340 - 343
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A novel method of measuring standing-wave distributions, using a modulated scatterer and a microwave homodyne receiver, has been developed, analyzed, tested, and shown to yield accurate results. Because the modulated scatterer can take the form of a small photoconductive dipole on the end of an optical fiber, access to the field to be measured from a contiguous shielded region, as in slotted trans... View full abstract»

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  • A 30 Ms/s 12-bit analog-to-digital converter

    Publication Year: 1989, Page(s):10 - 12
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The authors describe a 30-megasamples/s 12-bit analog-to-digital converter (ADC) using a subranging conversion technique. The key circuits for obtaining high accuracy at a 30-MHz conversion rate are a pipelined track-and-hold circuit and a high-speed 5-bit digital-to-analog converter. These circuit design features are presented. The ADC was fabricated on a printed-circuit board with about 500 surf... View full abstract»

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  • Fast adaptive filter (FAF) use in process instrumentation and automation systems

    Publication Year: 1989, Page(s):332 - 338
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A vector-space interpretation of FAF (fast adaptive filter) algorithms is presented. These algorithms are shown to be different from the least-mean-square (LMS) algorithms or other stochastic gradient algorithms. The impulse response and convergence behavior of the FAF are faster than those of the adaptive noise canceller for the same input and initial condition. Thus the FAF is suitable for use i... View full abstract»

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  • Phase measurement, traceability, and verification theory and practice

    Publication Year: 1989, Page(s):214 - 218
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Methods are presented that allow high-resolution (better than ±0.5 m°) relative and absolute phase measurements between sine waves to be made at, or in the vicinity, of angles of 0°, 60°, 90°, and 180°. Three of these methods appear to be completely independent of each other. They involve the use of 180° phase verification bridges, the use of a sine wave as a zero-de... View full abstract»

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  • A 1 Ms/s 16-bit analog-to-digital converter

    Publication Year: 1989, Page(s):6 - 9
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The author describes a 1-megasamples/s 16-bit analog-to-digital converter (ADC) that uses a subranging conversion technique. High accuracy at a 1-MHz conversion rate is obtained with novel circuits developed for a track-and-hold device, a residue amplifier, and a digital-to-analog converter. Design aspects of these key functional circuits are presented. A prototype ADC was fabricated on a printed-... View full abstract»

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  • A system for surveying power quality

    Publication Year: 1989, Page(s):400 - 401
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The author describes a system that is designed to survey power disturbances at representative sites across the continental USA. Disturbance data gathered from remote power monitors are transmitted over telephone lines to a central personal computer to be processed and saved in a database for further analysis and study. A summary of the system architecture is given, and special features of programs... View full abstract»

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  • Interpolation techniques for real-time multifrequency waveform analysis

    Publication Year: 1989, Page(s):325 - 331
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    It is well-known that in discrete-Fourier-transform- (DFT-) based waveform analysis of multifrequency signals, spectral parameter accuracy can be increased by windowing the time samples and interpolating the DFT coefficients. It is shown that some relationships used in interpolation are affected very little by the number of processed samples, so that only the characteristics of the analyzed signal... View full abstract»

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  • Digital spectra of non-uniformly sampled signals: theories and applications. III. A robust sampling time offset estimation algorithm for ultra high speed waveform digitizers using interleaving

    Publication Year: 1989, Page(s):208 - 212
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    For pt.II see IEEE Transactions on Instrumentation and Measurement, vol.37, no.3 (Sept. 1988). The author presents an algorithm for estimating the sampling time offsets of the parallel sampling paths of an ultra-high-speed waveform digitizing system that is realized by interleaving many sample-and-hold and A/D (analog/digital) converter modules. One obvious application of this algorithm is to feed... View full abstract»

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  • Design and implementation of a fast logarithmic stepped sine for a fixed sample rate digital network analyser

    Publication Year: 1989, Page(s):457 - 461
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A method is presented for measuring the transfer function and the harmonic distortion with a very accurate twelfth-octave stepped sine analysis between 20 Hz and 20 kHz using a digital fast-Fourier-transform- (FFT)- based analyzer. One of the major concerns in developing the algorithm was to obtain maximum measurement speed while maintaining high accuracy. The method is based on the use of interpo... View full abstract»

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  • An integration-type high speed analog-to-digital converter

    Publication Year: 1989, Page(s):2 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    An analog-to-digital converter consisting of a switched-capacitor integrator, comparator, and control circuit is presented. The conversion process consists of voltage-to-frequency conversion to determine the upper M bits of an N-bit representation of an input analog voltage and subsequent voltage-to-time conversion to determine the remaining lower N-M bits. The ... View full abstract»

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  • Application of a new radiation thermometry method to galvannealed and cold-rolled steels

    Publication Year: 1989, Page(s):24 - 28
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The authors describe an experimental and analytical study of a novel radiation thermometry method. The method uses a priori knowledge concerning the reciprocal relationship between two uniquely defined spectral emissivities, making quite accurate temperature measurement possible for materials to which conventional spectral and ratio methods are not applicable. The validity of the method is demonst... View full abstract»

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  • A TDM wattmeter with 0.5 MHz carrier frequency

    Publication Year: 1989, Page(s):111 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The operating principle and design of a TDM (time-division multiplexer) wattmeter with 0.5-MHz carrier frequency are described. At power frequency the meter was compared with the National Research Council's current-comparator power bridge. The nonlinearity error of the meter was smaller than 100 ppm of full scale over the wide range of inputs and the whole range of power factor. Preliminary result... View full abstract»

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  • 800 Ms/s arbitrary function generator

    Publication Year: 1989, Page(s):238 - 242
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    An arbitrary function generator capable of running from very low clock rates up to 800 Ms/s has been developed with sufficient timing and noise margins to allow repeatable unit-to-unit production and long operational life. The generator uses an 8-bit gallium arsenide digital/analog converter and a multiplexing scheme to allow waveform memory to be stored in a relatively low-speed memory. Critical ... View full abstract»

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  • A system for capturing and presenting short-duration voltage impulses on AC power lines

    Publication Year: 1989, Page(s):395 - 399
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Voltage impulses with frequency components substantially above the fundamental frequency can be found on AC power distribution systems. A system for capturing these impulses and presenting them for analysis is described. The system records both the impulse waveform and the fundamental waveform shape in digital FIFO (first in, first out) buffers. Both signals are continuously recorded; recording co... View full abstract»

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  • A statistical rule for estimating the number and parameters of sinusoids in a background of additive white Gaussian noise (AWGN)

    Publication Year: 1989, Page(s):320 - 324
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A method is proposed for estimating the number and parameters of sinusoids in a background of AWGN. The method filters the sinusoids by exploiting their deterministic nature. Compared to other methods, it is more efficient and more reliable at low signal-to-noise ratio. The required assumptions are less stringent. The flexibility of the technique allows important modifications such as the possibil... View full abstract»

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  • When 12-dB SINAD is not 12-dB SINAD [land mobile FM receivers]

    Publication Year: 1989, Page(s):505 - 507
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    12-dB SINAD (signal plus noise plus distortion to noise plus distortion ratio) is the standard measure of analog FM receiver sensitivity. The Electronics Industries Association (EIA) modified its standard for FM receivers in 1982. In this updated standard, the EIA changed the specifications for equipment used to measure SINAD. This change effectively changed the definition of 12-dB SINAD. The auth... View full abstract»

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  • Automatic generation of NC-code for hole cutting with in-process metrology

    Publication Year: 1989, Page(s):45 - 52
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A novel method for milling flat-bottomed circular holes with more accurate diameters has been added to the data preparation software for the vertical workstation of an automated manufacturing research facility. Additional design functions, a new process planning function, and a new numerical control (NC) code-generating function have been added to the software to implement the method. The cutting ... View full abstract»

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  • Digital correction of A/D conversion error due to multiplexing delay

    Publication Year: 1989, Page(s):204 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A measurement channel that consists of a multiplexer, sample-and-hold circuit, and analog-to-digital (A/D) circuits is designed for the synchronous sampling and measurement of two or more voltage signals (V1(t), V2(t), . . .). The finite time of A/D conversion (T) makes it possible to acquire samples of Vi+1(t) closer in time tha... View full abstract»

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  • Recent developments in digital oscilloscopes

    Publication Year: 1989, Page(s):154 - 155
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The author reviews the latest developments in digital storage oscilloscopes (DSOs) as reported in the literature. DSOs are used to digitize and store waveforms, which can be compared, analyzed, and manipulated. DSO capabilities usually include programmability, automatic waveform parameter measurement, display of pretrigger signal activity, and waveform averaging to reduce noise and ripple. Three m... View full abstract»

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  • An estimation method of the central frequency for optical velocity sensors

    Publication Year: 1989, Page(s):450 - 455
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors propose a signal processing method for measuring the velocity of moving objects (or moving scenes) using 2D spatial filters. The central (peak) frequency of the bell-shaped spectrum that contains the velocity information on the moving objects is estimated by fitting the sensor measurement data to AR(2) (second-order autoregressive) models so that the estimated coefficients directly yie... View full abstract»

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  • A 100000-ampere series high precision on-site measurement calibration device for heavy direct current

    Publication Year: 1989, Page(s):93 - 97
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A 100000-A series high-precision on-site calibration device for measuring high direct current of a magnetic modulation comparator type is presented. The device can be used in an industrial system for online calibration and measurement. Testing of the comparator shows that its accuracy for measuring current ratio is 5×10.5 and for measuring voltage with a standard resistance is 3&t... View full abstract»

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  • Integrated software: the use of the Asyst programming environment in science and engineering

    Publication Year: 1989, Page(s):263 - 265
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The Asyst programming environment for the IBM PC, which greatly simplifies software development for both data acquisition and data analysis, is described. Asyst communicates with numerous data acquisition and GPIB cards, making data acquisition and control of laboratory instruments a straightforward and easy task. Asyst contains a wide variety of analytical routines for data manipulation and theor... View full abstract»

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  • New internationally adopted reference standards of voltage and resistance based on the Josephson and quantum Hall effects

    Publication Year: 1989, Page(s):175 - 177
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    By international agreement, starting on January 1, 1990, new reference standards of voltage and resistance based on the Josephson and quantum Hall effects, respectively, are to come into effect worldwide. Implementation of the new standards in the US requires that the value of the present national representation of the volt and ohm maintained at the National Institute of Standards and Technology (... View full abstract»

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  • A method to estimate correlated color temperature of illuminant using color video camera

    Publication Year: 1989, Page(s):19 - 23
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The authors describe a novel, indirect method for estimating the correlated color temperature of illuminants by using a color video camera and a set of several known color chips. The video camera can have arbitrary shooting chromaticity characteristics; however, it should be used in fixed white balance. The correlated color temperature of the light source illuminating the color chips is estimated.... View full abstract»

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