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IEEE Transactions on Instrumentation and Measurement

Issue 4 • Dec. 1976

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Displaying Results 1 - 25 of 72
  • Table of contents

    Publication Year: 1976, Page(s): 1
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  • Table of contents

    Publication Year: 1976, Page(s): 1
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  • [Inside front cover]

    Publication Year: 1976, Page(s): c2
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  • Preface

    Publication Year: 1976, Page(s):281 - 282
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  • Editorially speaking

    Publication Year: 1976, Page(s): 283
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  • The continuing vitality of electromagnetic measurements

    Publication Year: 1976, Page(s):284 - 285
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (511 KB)

    MR. CHAIRMAN, members, and guests of CPEM. There are at least two reasons why I feel honored in being asked to address this meeting. First, the mark of excellence that characterizes the conference — a dynamic, up-to-date conference of international importance, one that has continued to maintain its scientific and technological interest during the 18 years of existence; and second, because I... View full abstract»

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  • Precise submillimeter-wave spectrometry of gases

    Publication Year: 1976, Page(s):286 - 289
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (815 KB)

    The UK NPL program of submillimeter-wave absorption measurements on gases is described. The instrumentation is capable of giving absorption line centres to an absolute accuracy of ±0.003 cm−1 (±100 MHz) in the spectral region 10–40 cm−1 (300 GHz–1.2 THz). As well as setting standards of measurement precision at submillimeter wavelengt... View full abstract»

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  • High-precision dielectric measurements on liquids and solids at millimeter and submillimeter wavelengths

    Publication Year: 1976, Page(s):290 - 294
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1482 KB)

    A brief outline is given of the improvements which have been made in the measurement techniques available for the determination of the complex relative permittivity of liquids and low-loss solids in the frequency range v = 100 GHz to 18 THz. These improvements involve very stable interferometric systems with either dielectric beam splitters for the upper frequency end or else free standing ... View full abstract»

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  • Sweep frequency transfer function measurement applied to optical fiber

    Publication Year: 1976, Page(s):294 - 297
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1246 KB)

    Up to now, most of the experimental work on propagation through optical fibers was done using pulse measurements techniques. Short-light-pulse sources almost monochromatic and easy to drive to high-peak-power pulses are available on the optoelectronic components market; this is one of the main reasons why fiber manufacturers characterize their fibers by the broadening of the transmitted light puls... View full abstract»

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  • A 1–18-Ghz attenuator calibrator

    Publication Year: 1976, Page(s):298 - 306
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6906 KB)

    This single-channel parallel IF substitution system performs attenuator calibrations in a stepped frequency mode to 110 dB through 1–18 GHz, with the accuracy of a fixed frequency system. Measurement time is reduced and operation is simplified by use of two digitally controlled, frequency-locked oscillators as signal source and local oscillator, a 30-MHz precision digital substitution stand... View full abstract»

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  • A reflectometer and power-ratio technique for the measurement of low values of waveguide attenuation

    Publication Year: 1976, Page(s):307 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    The device under test, which is terminated in a sliding short-circuit, is connected to the measurement plane of a tuned waveguide reflectometer and dc voltages, proportional to the incident and reflected power levels, are balanced, for various short positions, to yield the dissipative component of attenuation. Provision of a switched reference arm in the reflectometer enables the effects of therma... View full abstract»

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  • Maximum limits of efficiency for low-loss reciprocal adapters

    Publication Year: 1976, Page(s):312 - 314
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    Since the efficiency ηαl of an adapter for connecting two different transmission lines is a function of the reflection coefficient of the adapter termination, it will be different for each new use of the adapter. This paper suggests two estimates of ηαl for low-loss reciprocal adapters. Maximum limits of error are given in terms of the magnitude of... View full abstract»

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  • Repeatability of SMA coaxial connectors

    Publication Year: 1976, Page(s):314 - 320
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (909 KB)

    SMA connectors in three different configurations were investigated for variation of reflection coefficient magnitude and insertion loss for a given SMA connector connect-disconnect sequence. Repeatability measurements were taken over the frequency range of 2 to 18 GHz on the NBS Automatic Network Analyzer. Plots are given that show the SMA connector repeatability for both reflection coefficient ma... View full abstract»

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  • Launcher and microstrip characterization

    Publication Year: 1976, Page(s):320 - 323
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A method for identifying scattering parameters of launchers and uniform microstrips is presented. It is shown that 8 complex measurements (magnitude and phase) on two microstrips which are different only in length, inserted between two launchers, can give, with suitable algebraic treatment, the S-parameters of either the microstrips and the launchers. This technique is promising for deembedding ac... View full abstract»

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  • Measuring and minimizing diode detector nonlinearity

    Publication Year: 1976, Page(s):324 - 329
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1154 KB)

    This paper describes two techniques for measuring the linearity of amplitude detectors in general, and for measuring the deviation from square-law E of point-contact diode detectors in particular. A general mathematical model is given for determining the RF input power as a function of the detector output voltage. It is shown how to choose the value and the temperature coefficient of the video loa... View full abstract»

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  • Scattering parameters of SMA coaxial connector pairs

    Publication Year: 1976, Page(s):329 - 334
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1777 KB)

    A technique is described for making reflection and insertion loss measurements on microwave connectors, without the need for reference to calibrated or precision standards. The effects of connectors used in the measuring system are removed from the results, thus providing a means for testing and selecting cables from a group for specific critical applications. Results are given for a group of eigh... View full abstract»

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  • Development and evaluation of a set of group delay standards

    Publication Year: 1976, Page(s):335 - 342
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2118 KB)

    Group delay standards of 15,30, and 60 ns have been developed at JPL. Calibration data provided by NBS and others are presented and compared. Calibrations were performed at microwave frequencies of 2113,2295, and 8415 MHz as well as at a baseband modulation frequency of 500 kHz. The uncertainties of the measurement and effects of dispersion and cable reflections are discussed. View full abstract»

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  • A new self-balancing DC-substitution RF power meter

    Publication Year: 1976, Page(s):343 - 347
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (938 KB)

    Problems intrinsic in self-balancing Wheatstone bridges have led to the development of a new dc substitution microwave power meter. The new instrument allows four-terminal measurement of bolometer resistance and affords improved accuracy and lower noise at a lower cost than earlier instruments. Measurement errors due to imperfect behavior of the servo system are typically less than 0.01 percent. View full abstract»

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  • Microwave power measurement using absorption spectrum of ammonia gas

    Publication Year: 1976, Page(s):348 - 352
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (981 KB)

    A microwave power measurement technique using power saturation effect of the ammonia-gas spectrum is described. The absolute value of the power irradiated on the gas at resonance frequency is measured by detecting the fractional decrease of resonance absorption. Experiments carried out at 23.870 GHz, (J, K) = (3,3) inversion spectrum of ammonia 14NH3, are in agreement ... View full abstract»

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  • Nuclear magnetic resonance thermometry at ultra-low temperature

    Publication Year: 1976, Page(s):352 - 356
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1006 KB)

    The electromagnetic signal of NMR in pure metallic samples emerges as the most reliable technique for measuring low temperatures from 1 K to below 1 mK (10−3 K). This fact stems from the self-consistency of the temperature measurement by NMR, which relies on the Curie law and the Korringa law separately. Samples of Pt, Al, and Cu have been studied with a careful evaluation of the... View full abstract»

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  • A precision nuclear quadrupole resonance thermometer

    Publication Year: 1976, Page(s):357 - 362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2477 KB)

    A fully automatic precision thermometer using the NQR absorption of KCIO3 has been developed. The temperature absorption signal is automatically “searched.” The search frequency is locked to the center of the absorption signal and is converted to a temperature scale. Temperature readings from 77 to 374 K, with accuracy, reproducibility, and stability confirmed to ±1... View full abstract»

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  • PAPERS 
  • Precision measurement of backscattering cross-sections as a function of frequency

    Publication Year: 1976, Page(s):363 - 370
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1900 KB)

    For a scattering measurement setup comparisons are made between different modes of operation. In order to make the comparisons, a simple procedure is outlined so that a figure of merit characterizing a given mode can be found. Figures of merit are found for three modes of operation. The different modes of operation are characterized by the manner in which the test object signal is separated from u... View full abstract»

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  • Time-domain spectroscopy of dielectric materials

    Publication Year: 1976, Page(s):371 - 375
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1006 KB)

    The uses are discussed of formulas derived by input admittance analysis for the complex permittivity of dielectric samples, placed in a matched coaxial line or terminating it, as a function of the Fourier transforms of the incident and reflected real time pulses observed in time-domain spectroscopy. Precautions to be taken for dielectrics with appreciable ohmic conductance are described, and it is... View full abstract»

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  • High-sensitivity picosecond time-domain reflectometry

    Publication Year: 1976, Page(s):376 - 379
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1806 KB)

    The combination of a time-domain reflectometer, signal averager, and lock-in amplifier is shown to increase the amplitude sensitivity of the reflectometer by a factor of about 200 for observing small, multiple transmission line reflections. Replacing the signal averager by a second lock-in amplifier increases the sensitivity further by a factor of 10, but this method is only suitable for measuring... View full abstract»

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  • Impulse generator spectrum amplitude measurement techniques

    Publication Year: 1976, Page(s):380 - 384
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1131 KB)

    Various techniques that have been used to calibrate impulse generators and to measure spectrum amplitude are surveyed. A summary of experiments comparing the various techniques is included. The NBS measurement service for calibrating impulse generators is described. 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