IEEE Transactions on Instrumentation and Measurement

Issue 3 • Jun 1996

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Displaying Results 1 - 15 of 15
  • Computer controlled system for producing uniform magnetic fields and its application in biomedical research

    Publication Year: 1996, Page(s):701 - 709
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Methods of modeling and optimization are described for coil systems that produce magnetic fields of prescribed uniformity within a maximal volume, while minimizing stray fields. Two examples of application to biomedical research are analyzed in detail. One of them deals with animal exposure systems at 60 Hz within a confined space. The other considers exposure of cell cultures simultaneously to va... View full abstract»

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  • A PC-based coherent sonar for experimental underwater acoustics

    Publication Year: 1996, Page(s):693 - 700
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    An important tool for experimental underwater acoustics research is a versatile sonar system for transmitting, receiving, anti recording acoustic waveforms. In this paper the design, implementation and performance of a variable-frequency (25 kHz to 500 kHz) coherent sonar are presented. The significance of the design lies in its simplicity and versatility. These attributes are a result of a sampli... View full abstract»

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  • Considering clock errors in numerical simulations

    Publication Year: 1996, Page(s):715 - 720
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The description of a dynamic system often involves a wide range of time intervals. Before considering clock errors in numerical simulations of such systems, it is found necessary to simulate the clock itself over the full scale of times involved. A scheme is presented to do such a clock simulation numerically and to prepare the result as an input for the simulation of the dynamic system. Some inte... View full abstract»

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  • Measurement of X-ray tube accelerating potential by differential beam filtration

    Publication Year: 1996, Page(s):745 - 749
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Indirect determination of X-ray generator kilovoltage (kV) using the ratio of differentially filtered beam measurements has been known for 20 years. Measurement of generator potentials used for diagnostic computed tomography (CT), conventional X-ray, and mammography typically requires filter cassettes or special instruments in the X-ray beam; the resulting readings are usually accurate within &plu... View full abstract»

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  • The modulo time plot-a useful data aquisition diagnostic tool

    Publication Year: 1996, Page(s):734 - 738
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper illustrates the use of the Modulo Time Plot to facilitate diagnosis of data acquisition systems and components. While conventional techniques, involving spectral analysis and histograms, provide certain useful and necessary measures of performance, the use of reordered sample sets has gained considerable popularity in recent work aimed at characterizing analog-to-digital converter error... View full abstract»

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  • A microcontroller-based quasi-balanced bridge for the measurement of L, C and R

    Publication Year: 1996, Page(s):757 - 761
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A microcontroller-based quasi-balanced bridge for the measurement of parameters of an inductor or a capacitor is described. The unknown element (inductor or capacitor) in series with a resistor forms one-half of an ac bridge, while a multiplying digital-to-analog converter (MDAC) serves as the other half. The bridge is brought into two independent quasi-balanced conditions in succession by the mic... View full abstract»

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  • Measured 50 Hz electric and magnetic fields in Swedish and Norwegian residential buildings

    Publication Year: 1996, Page(s):710 - 714
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A comparative study of 50 Hz electric and magnetic fields in houses and offices in Sweden and Norway has been carried out. The local distribution systems in houses are often different in the two countries. Overall mean levels determined in houses were as follows: E fields 54 V/m (SD=37) and 77 V/m (SD=58) in Sweden and Norway respectively; B fields 40 nT (SD=37) and 13 nT (SD=17) respectively. The... View full abstract»

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  • On the measurement of SSB noise figure using sideband cancellation

    Publication Year: 1996, Page(s):721 - 727
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    A new method for determining the single-sideband noise figure of a device from double-sideband measurements is proposed which eliminates the need for tunable filters and hence greatly reduces the complexity and cost of performing accurate noise figure measurements. This paper compares results obtained to those obtained using a traditional single-sideband measurement system with a tuneable filter a... View full abstract»

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  • Design of narrowband, high-resolution multisines

    Publication Year: 1996, Page(s):750 - 753
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A method is presented to minimize the crest factor of narrowband high-resolution multisines. An adequate use of the envelope of the signal allows a significant reduction of both the required memory space and the calculation time as compared with a direct approach. A lower bound for the attainable crest factor is derived, and it is demonstrated on some experiments that the proposed algorithm comes ... View full abstract»

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  • A new filter-bank configuration for harmonic measurement

    Publication Year: 1996, Page(s):739 - 744
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    In this paper a new adaptive filter-bank structure suitable for the accurate harmonic measurement in power supply systems is presented. This adaptive measurement technique is based on the resonator-in-a-loop filter-bank structure and includes a new modified Gauss-Newton gradient algorithm. Using this filter-bank structure and a least-squared-error approximation method, simulation results are prese... View full abstract»

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  • A high-resolution, linear resistance-to-frequency converter

    Publication Year: 1996, Page(s):761 - 764
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A resistance-to-frequency converter consisting of a Wheatstone bridge followed by an integrator and a comparator is described. In concept the circuit represents a relaxation oscillator whose frequency changes linearly with a resistance change detected by the bridge. Analyses show that a resolution better than 0.05% is possible with the simple configuration, and an excellent linearity is maintained... View full abstract»

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  • Power factor definitions and power transfer quality in nonsinusoidal situations

    Publication Year: 1996, Page(s):728 - 733
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The apparent power and power factor definitions in nonsinusoidal situations are critically examined, and new power transfer quality factors are suggested. The use and relevance of the quality factors are illustrated in quantitative examples related to power factor compensation and power transfer quality improvement View full abstract»

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  • High-resolution measurements of the specific absorption rate produced by small antennas in lossy media

    Publication Year: 1996, Page(s):754 - 756
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    We describe a thermistor-based technique for measurement of the specific absorption rate (SAR) of radio frequency energy from a small antenna in lossy matter with high spatial resolution. The apparatus employs a small thermistor probe, that is moved about the antenna using a computer-controlled positioning system. The antenna is excited by pulses of radio frequency energy, and the SAR is obtained ... View full abstract»

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  • A simple measurement method to determine the burst acquisition time of digital systems

    Publication Year: 1996, Page(s):764 - 766
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A cost-efficient solution for measuring fast and ultrafast synchronization-caused bit errors is disclosed. This invention enables the user to modify conventional test instruments and to eliminate the need to obtain very expensive test equipment. Our new instrumentation implementation concept comprises a gated switch added to a pseudorandom bit sequence generator and analyzer. The synchronization t... View full abstract»

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  • Down-range test zone characterization for compact ranges

    Publication Year: 1996, Page(s):767 - 769
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Radar cross section measurement in a compact range is often performed using real-time pulse techniques (gating). This allows unwanted reflected signals (not originating from the object under test) to be suppressed and thus enhances the accuracy of the measurement process. In such a setup, the target positioning within the target zone defined by the pulse process is critical, since it may lead to t... View full abstract»

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Aims & Scope

Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief

SHERVIN SHIRMOHAMMADI
School of EECS
University of Ottawa
800 King Edward Ave.
Ottawa, Ontario
K1N 6N5 CANADA
Fax: 613-562-5664
shervin@discover.uottawa.ca