IEEE Transactions on Instrumentation and Measurement

Issue 2 • June 1979

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Displaying Results 1 - 25 of 25
  • Table of contents

    Publication Year: 1979, Page(s): c1
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  • IEEE Instrumentation and Measurement Society

    Publication Year: 1979, Page(s): c2
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  • The Problem of Calculating the Fast-Fourier Transform of a Step-Like Sampled Function

    Publication Year: 1979, Page(s):97 - 99
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (647 KB)

    The calculation of the fast fourier transform (FFT) for a step-like bounded function with unequal values at boundaries may be performed by using a convenient decomposition of the total curve into two elementary ones, one of them being a linear ramp. The method may be generalized to functions having asymptotic tails which may be approximated by simple analytic functions, the theoretical FFT of whic... View full abstract»

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  • Tuning of Hydrogen Maser Cavity by Means of a Variable Capacitance Diode

    Publication Year: 1979, Page(s):100 - 104
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    Details are given on a method of tuning a hydrogen maser cavity by means of a variable capacitance diode placed in a loop directly inside the cavity. The design of the loop-in which the varactor is placed, the loop connection to an external dc bias, and a theoretical analysis of the whole loop system (cavity, tuning loop, and coupling loop) are also given. View full abstract»

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  • An Example of the Use of CCD Processors in Automation

    Publication Year: 1979, Page(s):105 - 108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    This paper describes the theoretical design of a pattern-recognition system which could be used in automating bonding of hybrid-integrated circuits. Charge-coupled device (CCD) discrete analog processors are described in the context of their employment in the decision-making logic of the system. Comparisons are made between an all-digital and discrete analog implementation. View full abstract»

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  • Time-Domain Measurements for Determination of Dielectric Properties of Agricultural Materials

    Publication Year: 1979, Page(s):109 - 112
    Cited by:  Papers (17)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A time-domain reflectometer (TDR) system was used to obtain data on the frequency dependence of the dielectric properties of a few agricultural materials. Values for the complex relative permittivity in the frequency range from about 30 MHz to 1 or 2 GHz were obtained from the reflection coefficient, which was calculated from the ratio of the Fourier transforms of the incident and reflected wavefo... View full abstract»

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  • High-Accuracy Analog Measurements via Interpolated FFT

    Publication Year: 1979, Page(s):113 - 122
    Cited by:  Papers (235)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1518 KB)

    By use of an interpolated fast-Fourier-transform (FFT) algorithms are developed for multiparameter measurements upon periodic signals. Eight pertinent measurements, such as fundamental frequency, phase, and amplitude, are made with enhanced accuracy compared to existing algorithms, including tapered-window-FFT algorithms. For the more general case of nonharmonic multitone signals also the method i... View full abstract»

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  • Special Purpose Ammonia Frequency Standard a Feasibility Study

    Publication Year: 1979, Page(s):122 - 132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2384 KB)

    We have investigated the feasibility of a special purpose frequency standard based on microwave absorption in ammonia gas (N15H3). Such a device would potentially fill a need in certain communications and navigation applications for an oscillator which has medium stability, greater accuracy (~10-9) than that provided by crystal oscillators, but a cost significantly smaller than that of more sophis... View full abstract»

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  • A High Quality Controlled Current Source

    Publication Year: 1979, Page(s):132 - 140
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1546 KB)

    A technique for realizing a high-quality controlled current source is described. A monolithic operational amplifier is used as the main building block, and a modified current mirror is used to recover the signal current from the power supply leads of the amplifier. The proposed mirror exhibits low input resistance, which reduces errors due to the noninfinite power-supply rejection characteristics ... View full abstract»

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  • Siniglee-Staagee Amnplifierr-Aideed Current Transformers Possessing Small Ratio Errors at 60 Hz

    Publication Year: 1979, Page(s):141 - 146
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    Two directly coupled electronic techniques are described which reduce significantly the burden seen by a single-stage toroidal current transformer. Almost all the power is supplied by an electronic power amplifier so that magnetizing current within the transformer is extremely small Magnetic cores of small physical size may be used with small numbers of turns. Measured ratio errors at unity ratio ... View full abstract»

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  • 100:1 Step-Up Amplifier-Aided Two-Stage Current Transformer with Small Ratio Errors at 60 Hz

    Publication Year: 1979, Page(s):146 - 152
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1245 KB)

    An electronically aided 100:1 step-up two-stage toroidal current transformer is described which has very small ratio error. Two-stages of amplifier aiding are used. One stage reduces significantly the burden seen by the transformer while the other enables almost exact ampere-turn balance to be achieved between primary and secondary currents within the inner core of a two-stage arrangement. Practic... View full abstract»

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  • On the Enhancement of the SNR of Repetitive Signals by Digital Averaging

    Publication Year: 1979, Page(s):152 - 155
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (645 KB)

    A simplified technique to improve the signal-to-noise ratio (SNR) of repetitive signals by digital averaging is presented. The technique uses a threshold detector and a memory instead of the analog-to-digital converter and memory, which is the common practice. It is shown that if the SNR of the measurements is small and the number of averaged measurements is large then the SNR of the resulting sig... View full abstract»

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  • A New Liquid Level Sensor for Process-Control Applications

    Publication Year: 1979, Page(s):155 - 158
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (683 KB)

    Many process-control systems are air-operated. In such an environment, it would be desirable and economical to use pneumatic sensors. Bubble-back pressure sensors perform quite satisfactorily, but in case of viscous inflammable and slurry-like liquids with a tendency to froth, this level sensor is inadequate. The method suggested in this paper utilizes a pneumatic capacitor, one boundary of which ... View full abstract»

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  • Electromagnetic Nondestructive Testing of Cylindrically Layered Conductors

    Publication Year: 1979, Page(s):159 - 161
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB)

    We extend a previous analysis for the series impedance of a long solenoid to allow for the cylindrical layering of the encircled conductor. The results are discussed in the context of nondestructive testing of steel ropes that may have external or internal corrosion. It is shown that even an internal layer of reduced conductivity and permeability will be detectable if the frequency is sufficiently... View full abstract»

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  • An Electronic Ratio Error Set for Current Transformer Calibrations

    Publication Year: 1979, Page(s):162 - 164
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (537 KB)

    A direct-reading electronic ratio error set for current transformer calibrations is described. It is capable of generating direct and quadrature error currents from 1 ppm to 5 percent of transformer secondary currents up to 10 A. The uncertainty is less than one percent of the generated current. The set features electronic display of the direct and quadrature components with three digits each and ... View full abstract»

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  • The Utility of the All-Pass Filter

    Publication Year: 1979, Page(s):164 - 167
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    The all-pass filter has seen limited application as a phase-correction circuit for many years. This network can also be applied to many other important areas of electronic design. Applications ranging from inductorless bandpass filters to frequencymodulation circuits are discussed to demonstrate the broad utility of the all-pass network. View full abstract»

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  • Current-Controlled Relaxation Oscillator

    Publication Year: 1979, Page(s):167 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1321 KB)

    A novel form of relaxation oscillator that generates a sawtooth waveform of frequency linearly related to a control current is described. View full abstract»

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  • Influence of Local Oscillator Phase Noise on the Resolution of Millimeter-Wave Spectral-Line Radiometers

    Publication Year: 1979, Page(s):169 - 171
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  • Correction to "Measurement of Impedance by Cross-Coupler and Sliding Short at Microwave Frequencies"

    Publication Year: 1979, Page(s): 171
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  • Correction to "Automatic Calorimeter System for the Effective Efficiency Measurement of a Bolometer Mount in 35-GHz Band"

    Publication Year: 1979, Page(s): 171
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  • Input Offset Voltage and Current in Varicap Diode Modulators

    Publication Year: 1979, Page(s): 171
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  • Contributors

    Publication Year: 1979, Page(s):172 - 175
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  • An invitation to membership

    Publication Year: 1979, Page(s): 175-a
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  • IEEE Instrumentation and Measurement Society

    Publication Year: 1979, Page(s): 175-b
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  • Institutional listings

    Publication Year: 1979, Page(s): 175c
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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
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shervin@discover.uottawa.ca