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Instrumentation and Measurement, IEEE Transactions on

Issue 4 • Date Dec. 1983

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Displaying Results 1 - 24 of 24
  • Table of contents

    Page(s): c1
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  • IEEE Instrumentation and Measurement Society

    Page(s): c2
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  • Editorial with Thanks and Expectations

    Page(s): 457
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  • An Approach of Realizing a Linear-Phase Filter with a Multiple-Notched Property

    Page(s): 458 - 462
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    There are many applications where signals with relatively low frequencies must be measured under the following conditions: 1) eliminating very low frequencies (such as slow fluctuations) from a reference level, 2) rejecting 50/60 Hz and their harmonics, 3) keeping linear-phase frequency characteristics. A filter based on a conventional microprocessor having the above conditions has been simply implemented by modifying the concept of the Cascaded Integrator Comb (CIC) filter. In this paper, we will describe the hardware, software, and noise analysis of the advocated filter. View full abstract»

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  • An Automatic System for the Measurement of the Field Distribution in Resonant Cavities

    Page(s): 462 - 466
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    A computer-controlled system for the measurement of the field distribution in microwave cavities is described. Examples of field measurements at various resonant frequencies are given for a cavity with a complex geometry. View full abstract»

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  • An Isolated Sensor Determining the Poynting Vector in the near Field of a Radiating Antenna

    Page(s): 466 - 468
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    A system is described comprising of an isolated sensor to measure the polarization ellipses of the electric and magnetic vectors in the near field around a transmitting antenna or a scatterer in the frequency range from 0.5 to 10 MHz. The locus of the time-dependent Poynting vector is derived by numerical calculation. Results are displayed as a stereoscopic image. View full abstract»

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  • On the Output Resistance of Self-Checking Voltage Dividers

    Page(s): 469 - 471
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    This paper deals with the computation of the variable output resistance of Cutkosky's self-checking binary voltage divider. For an N-bit divider, the maximum output resistance was found to increase with N at the rate of N/9 times the divider's characteristic input resistance. To increase the divider's resolution while limiting its output resistance, a binary potentiometer as a termination is suggested. View full abstract»

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  • An Automated Test System for MNOS Transistor Characterization

    Page(s): 472 - 476
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    An automated and thorough characterization of MNOS transistors has been made possible by using a calculator-based instrumentation system. Fast pulse techniques are used to obtain maximum information and minimize reading disturbance during measurements. Device characteristics such as retention, endurance, and mobility can be obtained with minimal manual interaction. View full abstract»

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  • Metal Detector for Tracing Submarine Telecommunication Cables

    Page(s): 477 - 483
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    The characteristics and the optimum design of a metal detector are studied theoretically and experimentally. This metal detector is expected to be mounted on an unmanned submersible and to be used for the location finding and tracing of the submarine telecommunication cables. The detector consists of one exciting coil and two receiving coils which are fixed perpendicularly to the excitation coil. The receiving coils detect the magnetic field induced by the eddy current flowing in the outer conductor of the submarine cable. Although the detection range is narrow, about 40 cm, this detector has some advantages that the other cable-locating sensors do not have. The detecting characteristics are calculated numerically under several assumptions and compared with experimental results. View full abstract»

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  • Tolerance of Spectral Estimation

    Page(s): 484 - 490
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    A statistical expression for the mean square error of a spectrum estimation has been derived in terms of the variances and covariances of the amplitude and phase errors of a complex data sequence. No restrictions need be imposed on the magnitude of these variances and covariances. Numerical results have been systematically presented in graphs which illustrate the dependence of the spectrum error on the standard deviation and correlation distance of the amplitude and phase errors. It is shown that large phase error tends to dominate the spectrum error, and that large correlation distances worsen the spectrum error and sharpen its dependency on the frequency index. An expression to estimate the variance of frequency error has also been derived under the assumption of small phase errors. Numerical results are given, which demonstrate the linear dependency of the frequency error on the phase error and shows that a large correlation distance worsens the frequency error while a large number of samples reduces it. View full abstract»

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  • A μp-controlled flying-spot scanner with an intelligent A/D-converter unit

    Page(s): 491 - 496
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    A flying-spot scanning technique is useful for the measurement and mapping of inhomogeneities in semiconductor parameters such as minority carrier lifetime, resistivity, and surface-recombination velocity. This paper describes a system based on a 16-bit microprocessor and an intelligent 12-bit A/D-acquisition unit for automatic control and data processing of the measurement. The processor controls the scanning equipment while the intelligent A/D unit supervises the measurement by means of a single-chip microcomputer analyzing feedback signals from the scanner. Therefore, real-time data processing is achieved which significantly enhances the applicability of the flying-spot scanning technique. View full abstract»

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  • Nonlinear Ramp Generators

    Page(s): 497 - 500
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    Several circuits generating nonlinear time functions by digital techniques are shown. The functions we treat are logarithmic, exponential, square root law, and quadratic law. The specific advantages, general characteristics, and criteria for the selection of components are discussed. Simplicity and high slew rate capability are the main advantages of these circuits. View full abstract»

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  • Calibration and Use of a Reference Standard Directional Coupler for Measurement of Large Coupling Factors

    Page(s): 501 - 506
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    Fixed frequency, point-by-point calibration is outlined for a reference standard directional coupler to be used in steppedfrequency measurement of 40-dB, or greater, coupling factors of directional couplers. If a reference directional coupler has a 40-dB coupling factor, a main-line waveguide output, and a sexless coaxial side-arm output, the best accuracy obtainable in measurement of its coupling factor is estimated to be ±0.03 dB. View full abstract»

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  • An Equivalent Circuit of an Open-Ended Coaxial Line

    Page(s): 506 - 508
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    An equivalent circuit of an open-ended coaxial line used as a sensor for dielectric measurements is proposed. The parameters of the circuit are found by least square fitting to the values for the total capacitance calculated numerically. View full abstract»

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  • Advanced Control Method for Calorimetric Power Measurement

    Page(s): 508 - 509
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    An advanced temperature control system has been developed for calorimetric method of electromagnetic wave power measurement. The temperature deviation can be reduced by repeatedly substituting the controlled variable through a DA converter and an adder. The system has been applied to a calorimeter for laser power with experimental results yielding good agreement with analytical predictions. View full abstract»

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  • Low-Power Operation of the SBP9989 16-Bit I2L Processor

    Page(s): 509 - 512
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    Tests of maximum usable clock frequency as a function of injection current have been made on six Texas Instruments SBP9989 processors. In addition, the output characteristics for the logic output low condition have also been measured for the HOLDA terminal. All of these measurements were made over the full military temperature range. These tests have shown that the SBP9989, a 16-bit I2L processor with internal signed multiply and divide instructions, will operate at relatively high clock frequencies at low-power levels and consequently is well suited to high-performance low-power instrumentation and digital filtering applications. View full abstract»

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  • A Simple Stray-Free Capacitance Meter by Using an Operational Amplifier

    Page(s): 512 - 513
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    A simple operational amplifier circuit known as a charge amplifier has an advantage of measuring capacitance independent of stray capacitance. Capacitance down to 0.03 pF could be experimentally measured with ease and the theoretical limit of measurement is discussed. Also the direct measurement of the electrostatic induction coefficients of a system of conductors by the circuit is introduced. View full abstract»

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  • A Low-Cost Digital Psychrometer and Humidity Controller

    Page(s): 513 - 517
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    The digital psychrometer presented in this paper is a general type of humidity meter with an accuracy of ±1 percent with 8-bit resolution and the humidity controller has an accuracy of ±0.5 percent. It is optimized by using the fewest possible number of components in order to increase the reliability and to reduce the cost. The speed of operation of this circuit is on the order of 500 ns. This circuit is used for measurement and control of humidity in the temperature range of 0-31°C with an accuracy of ±1°C for temperature with 5-bit resolution and 1-kbyte memory space is used for storing humidity values. This circuit is provided with wide flexibility to change its measurement range according to the users' specifications. This circuit is used for measurement and control of humidity in cold-storage process applications, textile industrial applications, etc. View full abstract»

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  • Capacitance of Open-Ended Dielectric-Filled Coaxial Lines-Experimental Results

    Page(s): 517 - 519
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    Capacitance of open-ended coaxial lines is determined experimentally using a resonant technique. An empirical expression for the capacitance versus frequency, which enables the open circuit to be used as a calibration standard for microwave network analyzers, is proposed and verified. View full abstract»

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  • Pressure-Change Detection by Infrared Sensors of Thermal Type, Thermistor Bolometer and Pyroelectric Sensor

    Page(s): 519 - 521
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    The effect of a pressure change of air upon infrared sensors of thermal type, thermistor bolometer, and pyroelectric sensor, has been investigated. Experimental results indicate that the pressure dependence of the sensors is related to the temperature change of the sensor. The temperature change is caused by the pressure change of air surrounding the sensor. These results show that infrared sensors of the thermal type with high detectivity can be used as air-pressure change detectors. View full abstract»

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  • Contributors

    Page(s): 522 - 526
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  • 1983 Index IEEE Transactions on Instrumentation and Measurement Vol. IM-32

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  • IEEE Instrumentation and Measurement Society

    Page(s): 12-a
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  • Institutional listings

    Page(s): 12b
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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
Prof. Alessandro Ferrero
Dipartimento di Elettrotecnica
Piazza Leonardo da Vinci 32
Politecnico di Milano
Milano 20133 Italy
alessandro.ferrero@polimi.it
Phone: 39-02-2399-3751
Fax: 39-02-2399-3703