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IEEE Transactions on Instrumentation and Measurement

Issue 3 • Sept. 1978

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Displaying Results 1 - 25 of 35
  • Table of contents

    Publication Year: 1978, Page(s): c1
    Request permission for commercial reuse | PDF file iconPDF (160 KB)
    Freely Available from IEEE
  • IEEE Instrumentation and Measurement Society

    Publication Year: 1978, Page(s): c2
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    Freely Available from IEEE
  • Automatic Calorimeter System for the Effective Efficiency Measurement of a Bolometer Mount in 35-GHz Band

    Publication Year: 1978, Page(s):205 - 209
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1689 KB)

    An automated calorimetric measurement system using a microcomputer has been developed for determining the effective efficiency of a bolometer mount in the millimeter-wave region. This system consists of a calorimetric measurement part, a bolometric measurement part, and a control/data processing part. The system has been constructed and experimented in 35-GHz band. The accuracy of the system has b... View full abstract»

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  • Improvements of the Procedures Used to Study the Fluctuations of Oscillators

    Publication Year: 1978, Page(s):210 - 214
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    Considering that procedures currently used to study the fluctuations in oscillators do not give directly useful results, we have tried to define a procedure more suitable for experimentalists. We have tempted to obtain a function σ(T) which would be a kind of variance of the frequency fluctuations observed in a duration T. Taking a frequency domain point of view, we find a procedure which ... View full abstract»

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  • An Analog Parallel Fourier Transform (PFT) Equipment and Its Application to the Moving Vehicle Size Detection in a Spatial Frequency Domain

    Publication Year: 1978, Page(s):215 - 219
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2335 KB)

    A new type of Fourier transform system proposed by the author was realized in hardware and applied to the moving vehicle size detection. CdS photo-sensor array (9 cell units) was used to pick up the moving vehicle image which was transformed into spatial frequency domain. The experimental results showed the peak value of the fundamental component corresponded to the vehicle size. View full abstract»

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  • A Fast-Response Logarithmic Electrometer for Pulse-Reactor Experiments

    Publication Year: 1978, Page(s):220 - 224
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1634 KB)

    The response time of a logarithmic electrometer was improved for pulse reactor experiments requiring long detector cables. A new phase-compensation technique was used in the circuit and it is based on the idea that a current variable resistance inserted between a detector cable and the input terminal of the logarithmic electrometer recovers the phase lag caused by the input capacitance. This stabl... View full abstract»

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  • Link Compensation in the Kelvin Bridge

    Publication Year: 1978, Page(s):225 - 227
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1223 KB)

    Compensation for the effects of large link resistance in bridge measurement of four-terminal resistors usually requires high precision in the adjustment of the compensating ratio arms. This paper describes an alternative method which requires no change in the normal balance procedures and is inexpensive to implement using readily available operational amplifiers. A description of a particular meas... View full abstract»

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  • Manometer for Measurement of Differential Pressure of the Order of 2 Millibars

    Publication Year: 1978, Page(s):227 - 230
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3503 KB)

    Examining the functioning of sensors for measuring pressure shows that most of them make we of a displacement. The linearity and the sensitivity of this type of sensor are closely dependent on the value of this displacement. For the sake of linearity and repeatabiity of large, signals, the displacement has to be small Consequently the output signals obtained are weak. View full abstract»

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  • A Technique for Measuring the Efficiency of Waveguide-to-Coaxial-Line Adaptors

    Publication Year: 1978, Page(s):231 - 234
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB)

    This paper describes a technique for measuring the efficiency of a waveguide to coaxial line adaptor fitted with a sexless connector. Three such adaptors of the same type are required to implement the technique but there are no constraints on the characteristics of the individual adaptors; neither low dissipative attenuation nor low VSWR are necessary and identical performance of adaptors within t... View full abstract»

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  • The Electromagnetic Basis for Nondestructive Testing of Cylindrical Conductors

    Publication Year: 1978, Page(s):235 - 238
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (609 KB)

    Using an idealized model, we deduce the impedance per unit length of long solenoid of many turns that contains a cylindrical sample. The sample with a specified conductivity and magnetic permeability need not be centrally located within the solenoid provided all transverse dimensions are small compared with the free-space wavelength. The derivation is relatively straightforward and it provides a j... View full abstract»

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  • Noise Spectra for Monolithic Detector Arrays

    Publication Year: 1978, Page(s):239 - 242
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2409 KB)

    A brief review of nonstationary processes is extended so as to include mixed stationary processes as they apply to the determination of the power density spectrum for monolithic detector arrays. An analog method for determining noise spectra is developed. Both theoretical and experimental results are presented. View full abstract»

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  • Proposed Instrumentation for Analytical Video Stereoscopy of Extended Images

    Publication Year: 1978, Page(s):243 - 246
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    An approach to real-time photogrammetry is outlined using video techniques in order to combine precision coordinate control of stereo-related images with image enhancement and processing while viewing the stereo model, thereby facilitating photointerpretation in certain applications. One variant replaces the stereo optical paths of an analytical plotter with TV cameras, video signal processing and... View full abstract»

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  • Multiple-Beam Interferometry

    Publication Year: 1978, Page(s):246 - 249
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB)

    An optical interferometer is described in which spatial and temporal resolution of the plasma density are achieved simultaneously, thus circumventing a limitation of conventional interferometers. The instrument consists of a Twyman-Green interferometer illuminated by a CW He-Ne laser. The technique has proven to be particularly applicable to plasma events that lack reproducibility. An additional a... View full abstract»

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  • A Frequency-Lock System for Improved Quartz Crystal Oscillator Performance

    Publication Year: 1978, Page(s):249 - 252
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (694 KB)

    The intrinsic noise of the best quartz crystal resonators is significantly less than the noise observed in oscillators employing these resonators Several problem areas common to traditional designs are pointed out and a new approach is suggested for their solution. Two circuits are described which frequency lock a spectrally pure quartz crystal oscillator to an independent quartz crystal resonator... View full abstract»

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  • An Error Analysis for the Measurement of Satellite EIRP Using a Calibrated Radio Star

    Publication Year: 1978, Page(s):253 - 258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1886 KB)

    An outline for the derivation of equations employed in a measurement and error analysis of satellite EIRP using a calibrated radio star is presented. A table showing analysis results at 7.55 GHz using Cassiopeia A for a satellite at 120 elevation angle is given. The quadrature sum of the systematic errors appearing in the table is 10.1 percent. Also presented is a curve of the systematic errors as... View full abstract»

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  • An RMS Digital Voltmeter/Calibrator for Very-Low Frequencies

    Publication Year: 1978, Page(s):259 - 268
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2848 KB)

    A portable rms digital voltmeter (DVM) has been developed at NBS to support vibration measurements over the ranges of 0.1 to 50 Hz and 2 mV to 10V. A self-contained calibrator provides for self-calibration and may be used for calibrating other VLF voltmeters. The calibrator basically consists of a Kelvin-Varley divider fed by a reference voltage (either dc or sinewave generated by a ROM-DAC combin... View full abstract»

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  • VHF Loop Antenna Loss Measurements

    Publication Year: 1978, Page(s):268 - 273
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1043 KB)

    The product of the loss ratios of two very small loop antennas, oriented such that their axes coincide, is given approximately by L1L2 = A(1.5)-2(1 + k2d2)-2(kd)6 where L1 and L2 are the dissipative power loss ratios of the loops, d is the spacing between the loops, and k = 2π/wavelength. A is the insertion loss measured between the ports of the two loops including their matching networks.... View full abstract»

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  • Bandpass Filter Comparator for Confirming the Absence of Serious Internal Voids in Wood Poles

    Publication Year: 1978, Page(s):273 - 276
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1522 KB)

    Structural timber is frequently exposed to weather and is thus subject to decay and consequential strength loss which eventually requires the replacement of the affected member. When decay is internal, destructive investigation is the only direct way of detecting it. This is obviously undesirable and a frequently used alternative is to tap each member with a hammer. A conclusion is reached by list... View full abstract»

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  • A New Way in the Development of Electronic Electrometers with a Varicap-Diode Modulator

    Publication Year: 1978, Page(s):276 - 280
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    In this paper, the theoretical studies and adopted technical solutions relative to an electronic electrometer with a varicap-diode modulator are described. The electrometer has an input resistance of 1014 Ωat 1-V input. The use of this electrometer technique and the performance limitations which may be obtained are analyzed. In order to overcome the usual input resistance of the varicap-di... View full abstract»

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  • A Precise Instrument for Measuring Water Waves

    Publication Year: 1978, Page(s):281 - 284
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1396 KB)

    A novel design of an electronic instrument used for measuring water waves is presented. The instrument, which operates in conjunction with a twin-wire conductance probe, effectively computes the conductance by analog division. Lead-wire voltage drops, which are largely responsible for distortion in wave peaks, are subtracted from the voltage-proportional input signal. In addition, the unit incorpo... View full abstract»

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  • A Combined Total Reflection-Transmission Method in Application to Dielectric Spectroscopy

    Publication Year: 1978, Page(s):285 - 288
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (627 KB)

    A combined total reflection-transmission method for permittivity measurements at radio and microwave frequencies is described. Analytical expressions for the dielectric constant and the loss factor of a sample, viewed as a two-port in the transmission system, in terms of the measured scattering parameters are given. ne uncertainty of measurements of the dielectric constant and the loss factor is d... View full abstract»

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  • A Laboratory Setup for Simulating an N-Hop 2-PSK Direct Regenerative System

    Publication Year: 1978, Page(s):289 - 293
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2584 KB)

    A circulating test loop setup for simulating an N-hop 2-PSK direct regenerative system in the laboratory, is described. A 2-PSK direct regenerator at carrier frequency fc = 2 GHz and bit-ratefb = 50 Mbit/s is designed and included in the test loop. The N-hop transmission is simulated by allowing a 2-PSK sequence of 16 bit to enter the test circuit and to circulate N times through the regenerator a... View full abstract»

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  • A/D Controller for Acquisitions of Signals with Different Sampling Periods

    Publication Year: 1978, Page(s):294 - 295
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (395 KB)

    Efficient data acquisitions from analog signals of very different bandwidths require that each analog signal be sampled at a different rate. This paper proposes an A/D controller which has been implemented on an Analogic 5800 data acquisition system. The host computer is a PDP 11/45 with a DR11-C interface (see Fig. 1). Essentially, this programmable controller sorts out the sequencing of eight di... View full abstract»

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  • A Digital Frequency Meter for Measuring Low Frequencies

    Publication Year: 1978, Page(s):295 - 296
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB)

    A new technique of measuring low frequencies accurately has been described. The whole scheme can be implemented using TTL integrated circuits. View full abstract»

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  • Electrolyte Conductivity Apparatus

    Publication Year: 1978, Page(s):296 - 297
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB)

    The resistance of an electrolytic cell is measured by passing a square-wave constant current and amplifying/rectifying the voltage developed. A differential recorder provides a record of the conductivity in dynamic mixing studies. The apparatus is extremely simple and reliable and amenable to multiprobe studies. 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