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IEEE Transactions on Instrumentation and Measurement

Issue 2 • Date June 1984

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Displaying Results 1 - 24 of 24
  • Table of contents

    Publication Year: 1984, Page(s): c1
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  • IEEE Instrumentation and Measurement Society

    Publication Year: 1984, Page(s): c2
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  • Editorial Wherefrom Do We Draw Our Strength? Your Editor's First-Year Report

    Publication Year: 1984, Page(s): 73
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  • A Tribute and a Welcome

    Publication Year: 1984, Page(s): 74
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  • Mean Estimation of Random Process with Aid of ON-OFF Detectors

    Publication Year: 1984, Page(s):75 - 78
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (702 KB)

    This paper presents a maximum likelihood method (ML) of mean estimation of a random process when the measurement of the exact value of process is not required. The estimation is accomplished with an array of ON-OFF detectors. It is shown, that there exists an optimal value of standard deviation which gives the maximum value of accuracy for the worst case, i. e., when the measured mean value is exa... View full abstract»

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  • A Coaxial Cable Delay System for a Synthesis Radio Telescope

    Publication Year: 1984, Page(s):78 - 83
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1161 KB)

    A switchable coaxial cable delay system for path compensation in a synthesis radio telescope operates over the frequency band 15-45 MHz. The requirements of continuum and spectral line observations determine the system specifications. Diode switches include or exclude cables whose lengths form a binary sequence from 0.625 to 320 m. Cables are equalized to compensate for the effects of frequency de... View full abstract»

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  • Experimental Characterization of a Singly Loaded E-Plane Waveguide Post by Using a Tunable Coaxial Line

    Publication Year: 1984, Page(s):83 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Equivalent-circuit parameters of a singly loaded E-plane waveguide post have been experimentally measured by loading one end of the post with a tunable coaxial line. The resulting structure shows a transmission minimum and a transmission maximum. The positions of the movable short for minimum and maximum transmission have been correlated with the parameters to be measured. It is seen that the erro... View full abstract»

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  • Numerical Solution of the Dielectric Equation for a Coaxial Line

    Publication Year: 1984, Page(s):88 - 90
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    Dielectric measurements using a coaxial transmission line terminated by a shielded open circuit give rise to the transcendental equation z tan z = c, where c = a + jb is a measured quantity. Since a ¿ 0, Newton's method will rapidly converge to one of the roots unless it gets trapped in an attractive cycle. Regions containing the lowest and second-lowest roots are sketched. Moreover, starting val... View full abstract»

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  • Self-Calibrating Cryo Current Comparators for AC Applications

    Publication Year: 1984, Page(s):91 - 96
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1228 KB)

    The outstanding dc properties of cryo current comparators make it possible to build ac comparators practically free of error. Special coaxial windings allow the capacitive error of any 1/N comparator to be compensated for by means of two separated self-calibration measurements for the primary and the secondary winding. It is shown that errors can be kept as low as 1 X 10-8 at 10 kHz. View full abstract»

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  • Extended Time Sampling for Accurate Optical Pulse Reflection Measurement in Level Control

    Publication Year: 1984, Page(s):97 - 100
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2400 KB)

    Pulse reflection methods play an important role in the diversified fields of industrial measurement. The paper reports on an optical short-range radar with superior resolution using a modified sampling procedure. The developed system has been tested successfully for level control applications, such as for measuring the meniscus of the molten steel in the mold of a continuous casting installation. View full abstract»

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  • Automatic Microwave Attenuation Measurement Using Double Phase Modulation

    Publication Year: 1984, Page(s):101 - 105
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    For automatic precision attenuation measurements, the double phase-modulation technique has been proposed, which employs two kinds of phase modulation instead of the amplitude modulation used in the modulated subcarrier method. The technique is analyzed theoretically and a 10-GHz automatic attenuation measurement system is constructed and tested. View full abstract»

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  • Group Delay Measurements at Audio Frequencies

    Publication Year: 1984, Page(s):105 - 110
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1278 KB)

    The paper discusses the measurement of group delay distortion at audio frequencies. Loop measurements and line measurements are discussed separately, and existing meters are reviewed. For both types of measurement, a stored-program approach using microprocessors is proposed, and laboratory models are described and evaluated. The use of microprocessors results in compact and inexpensive, yet accura... View full abstract»

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  • Limitations of Hydrogen Maser Frequency Standards Due to Receiver Noise

    Publication Year: 1984, Page(s):110 - 116
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1415 KB)

    In this paper we give a description of the different noise sources occurring in the receiving electronics of an active hydrogen maser and their influence on overall stability. It is shown that the most significant noise sources in the PLL locking a VCXO to an atomic oscillator are the preamplifier and the frequency multiplier. A measuring method yielding the noise behavior of the entire receiver i... View full abstract»

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  • Improvement in a Hydrogen Maser by a New State Selection

    Publication Year: 1984, Page(s):117 - 121
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1047 KB)

    The improvement in a hydrogen maser operation by a new state selection is described. The new state selection in which the Majorana transition is used is carefully designed about the beam optics and the reverse magnetic field in order to effectively eliminate the undesirable atoms for a maser oscillation. The efficiency of the state selection is improved to the extent of 90-percent elimination of u... View full abstract»

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  • A Vocalized Color Recognition System for the Blind

    Publication Year: 1984, Page(s):122 - 126
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1090 KB)

    The design of low-cost, portable, vocalized color recogition system for the blind has been described in detail. The system in its minimum configuration, can recognize 24 colors with 100-percent accuracy using separate templates for the broad surface categories: full gloss, semigloss, and matt. The design rationale is comprehensively discussed to facilitate the expansion of the system for better co... View full abstract»

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  • Simple Radiometer for Long-Term Monitoring of Atmospheric Transmittance in the Far IR

    Publication Year: 1984, Page(s):126 - 127
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (409 KB)

    Generally, in the far IR (300-3000,¿m), measurements of atmospheric transmittance are made with rather sophisticated instruments using liquid helium. These are not suitable for long-term monitoring of the atmosphere. In this short paper, a simple radiometer able to measure atmospheric transmittance in the 7-10-cm-1 window, is described and preliminary results are presented. View full abstract»

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  • A Fully Compensated Digital Ultrasonic Sensor for Distance Measurement

    Publication Year: 1984, Page(s):128 - 129
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    A distance measurement system using an ultrasonic transducer is described. The method is based on comparison of the unknown distance with a standard length in the same medium. The measurement made is independent of temperature, humidity, pressure, and any other atmospheric conditions. The proposed method claims improved performance and accuracy over the methods known so far. A resolution of 0.25 m... View full abstract»

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  • Practical Method for Calculating the Thermal or Driving Point of Lines: Grounding Applications

    Publication Year: 1984, Page(s):130 - 134
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    The different problems involved in the design and techniques to establish earth grounding and reference plane systems that are compatible with requirements of measurement standards are discussed considering transmission line theory particularly when the reference plane must be electrically far from the earth. A solution for several cases is outlined. View full abstract»

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  • Error in Insertion Loss Measurement Due to Multiple Reflections

    Publication Year: 1984, Page(s):134 - 136
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    A system error of a waveguide impedance bridge due to multiple reflections between the test section and the bridge circuit is analyzed. A principle and a method of making corrections to this system error are presented with actual numerical examples. View full abstract»

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  • Simplified Noise Evaluation of Microwave Receivers

    Publication Year: 1984, Page(s):136 - 140
    Cited by:  Papers (19)  |  Patents (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1878 KB)

    The noise figure for arbitrary source admittance can be computed from the noise figure at any one source admittance and the output noise when passive one-ports are connected to the receiver input, if input admittance is known. The procedure is demonstrated experimentally at 4000 MHz with offset short circuits as the passive one-ports. The input admittance determined by mismatched noise sources agr... View full abstract»

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  • Contributors

    Publication Year: 1984, Page(s):140 - 143
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  • Annual S-IM Transaction Paper Award Information

    Publication Year: 1984, Page(s): 144
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  • IEEE Instrumentation and Measurement Society

    Publication Year: 1984, Page(s): 144-a
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  • Institutional listings

    Publication Year: 1984
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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