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IEEE Transactions on Instrumentation and Measurement

Issue 3 • Sept. 1969

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Displaying Results 1 - 25 of 25
  • [Front cover]

    Publication Year: 1969, Page(s): c1
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1969, Page(s): c2
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  • Table of contents

    Publication Year: 1969, Page(s): 149
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  • Measuring the Electrothermal Efficiency of a 50-Hz Plasma Torch

    Publication Year: 1969, Page(s):150 - 156
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3762 KB)

    This study concerns the measurement of electrothermal efficiency in an ac plasma torch. It was found that the best method of measuring arc input power was an electronic system involving multiplication and integration although thermal wattmeters could be used with a slight loss of accuracy. A self-jacketed parallel flow calorimeter was found best for measuring the heat content of the torch output. ... View full abstract»

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  • Linear Integrated Circuit Phase Meter

    Publication Year: 1969, Page(s):157 - 160
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (721 KB)

    A precision phase meter with integrated circuits is described. Important features include variable sensitivity and automatic return toward midscale when the output approaches prescribed limits. The phase meter accepts inputs with frequencies from 10 to 100 kHz and with an amplitude range from 30 mV to 3 volts rms. The operational temperature range is from 0 to 50°C. The overall phase accuracy wit... View full abstract»

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  • Simple Technique for High-Resolution Time-Delay and Group-Velocity Measurements at Radio Frequencies

    Publication Year: 1969, Page(s):160 - 162
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB)

    A simple technique for measuring the time delay a (modulated) radio-frequency signal experiences when passing through a medium or device is described. A carrier signal at the desired frequency is (sine) wave amplitude modulated (e. g., at 2 MHz). The modulated signal is passed through the medium or device, amplitude-detected, and compared in phase with the modulating signal from which the time del... View full abstract»

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  • Hot Wire Anemometer Measurements in Flows Where Direction of Mean Velocity Changes during a Traverse

    Publication Year: 1969, Page(s):163 - 166
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (899 KB)

    This paper describes a simple method that allows X-array hot wire measurements to be made in a flow where the direction of the mean velocity changes during a traverse. Such situations are encountered in measurements behind turbulence promoters, flow across curved surfaces, in diffusers, nozzles, and many others. Variations in mean flow direction of up to 55° are allowable without requiring extens... View full abstract»

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  • Characterization of Multiple Parallel Transmission Lines Using Time Domain Reflectometry

    Publication Year: 1969, Page(s):166 - 171
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1062 KB)

    Two methods of using time domain reflectometry for the characterization of a system of multiple parallel transmission lines are described. The two methods are the reflection method and the direct method. The selection of a method depends on the accuracy required and the property of the system of transmission lines to be measured: [Y0], [Z0], [C], or [L]. View full abstract»

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  • Radiometric Evaluation of Antenna-Feed Component Losses

    Publication Year: 1969, Page(s):172 - 183
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2718 KB)

    Low-noise antenna systems are frequently used in conjunction with measurements of atmospheric and cosmic background noise at microwave frequencies. The input transmission line losses of these receiving systems must be precisely calibrated to insure proper identification of the portion of operating noise temperature attributable to the external environment. Although most components in an antenna li... View full abstract»

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  • Time Domain Reflectometer Return Loss Measurements

    Publication Year: 1969, Page(s):184 - 188
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1611 KB)

    Equations are derived for the exact identification of a transmission line discontinuity that can be represented by an equivalent circuit consisting of one or more cascaded, series-inductive, parallel-capacitive, and series-transmission-line elements. Equations are presented for determining frequency domain return loss from time domain reflectometer data and the frequency limitations for this metho... View full abstract»

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  • Methods of Extending the Range of Frequency Counters

    Publication Year: 1969, Page(s):189 - 193
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The various methods of extending the range of frequency counters are discussed and some of the shortcomings of each are pointed out. A new method that minimizes these short-comings is in the range of frequencies that can be counted entirely by the frequency limitations of AND gates; also it requires no tuning and its counting precision is the same as that of the basic counter. View full abstract»

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  • Interferometer for the Measurement of the Fresnel Dragging Effect on Microwaves by a Drifting Electron Plasma

    Publication Year: 1969, Page(s):194 - 197
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    An apparatus is described that measures deviations from reciprocity in the propagation of electromagnetic waves traveling through a medium. The medium under test was plasma. The apparatus was built for 3-cm waves. The minimum detectable phase difference between the two directions was ~ 2 X 10-3 degree. View full abstract»

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  • Design and Construction of a Direct-Plotting Capacitance Inverse-Doping Profiler for Semiconductor Evaluation

    Publication Year: 1969, Page(s):197 - 202
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2557 KB)

    A new technique involving harmonic generation in measuring the doping profile normal to the surface of semiconductor epitaxial wafers has been developed. This method has been used in the construction of a direct-plotting inverse-doping profiler which can determine the doping concentration with an absolute accuracy of about 10 percent and a relative accuracy of a few percent. The depth resolution i... View full abstract»

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  • Error Analysis for Waveguide-Bridge Dielectric-Constant Measurements at Millimeter Wavelengths

    Publication Year: 1969, Page(s):203 - 208
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    The use of the free-space waveguide-bridge dielectric-measurement technique is demonstrated for accurate complex-permittivity measurements at millimeter wavelengths. An error analysis is presented for applications of this technique with the sample rotated in the plane of incidence in order to avoid coupling between the sample and the horns, and to minimize the effects of multiple reflections from ... View full abstract»

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  • Cryogenic Microwave Cavity for Semiconductor Diagnostics

    Publication Year: 1969, Page(s):208 - 210
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (586 KB)

    A replaceable wall microwave cavity for semiconductor diagnostics is described for operation at cryogenic temperatures. A method of temperature compensation of resonant frequency is developed to minimize the frequency deviation due to thermal contraction of the cavity body. The anomalous skin effect at low temperatures is observed and taken into consideration. View full abstract»

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  • On the Extraction of Signals from Environments Containing Additive-Noise and Multiplicative Characteristics

    Publication Year: 1969, Page(s):211 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    The purpose of this paper is to present an applications-oriented discussion of the Kalman filter theory. The subject has received extensive treatment in the fields of orbit estimation and deterministic control system theory. This paper will emphasize the extraction of information from an additive-noise environment, i.e., the classical observation problem and its relation to the estimation theory. ... View full abstract»

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  • Some Design Considerations for Digital Position and Velocity Detecting Systems

    Publication Year: 1969, Page(s):216 - 221
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1049 KB)

    Design-type information is presented for a system that uses pattern recognition principles to sense position and velocity of moving objects. Judging from the literature, little or no work has been done on this type of system. It is believed that these systems have potential industrial and military applications, e.g., an optical object finder that identifies objects in addition to locating them, or... View full abstract»

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  • Frequency Stability of a Clapp VCO

    Publication Year: 1969, Page(s):221 - 224
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    The objective of this paper is to obtain numerical bounds on the frequency drift of a Clapp voltage-controlled oscillator. It will be seen that the Clapp oscillator has a center frequency that changes by less than 0.1 percent after 20 years and over 50°C temperature range. View full abstract»

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  • Superheterodyne Measurement of Microwave Attenuation at a 10-kHz Intermediate Frequency

    Publication Year: 1969, Page(s):225 - 231
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3010 KB)

    The excellent relative frequency stability of the output of two microwave oscillators phase-locked to a common reference signal permits the use of an audio intermediate frequency in the superheterodyne measurement of microwave attenuation. The phase-lock feature also permits the measurement of microwave phase at the audio frequency. The choice of the audio instead of the more conventional 30-MHz i... View full abstract»

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  • Accuracy of a Temperature-Compensated Precision RF Power Bridge

    Publication Year: 1969, Page(s):232 - 236
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1554 KB)

    A temperature-compensated de-substitution-type RF power bridge is described. Temperature compensation is accomplished through utilization of dual bridges and the widely used dualelement temperature-compensated thermistor mount. A review of the RF-to-dc substitution technique is made prior to the description of the bridge. An analysis of the measurement accuracy shows total errors of less than 0.14... View full abstract»

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  • Further Comments on the Fundamental Limit to the Balance of a Microwave Bridge Containing a Dispersive Element

    Publication Year: 1969, Page(s):237 - 238
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  • Comment on the Definition of the Effective Efficiency of Laser Calorimeters

    Publication Year: 1969, Page(s):238 - 239
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  • Contributors

    Publication Year: 1969, Page(s):240 - 243
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1969, Page(s): 243a
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  • Invitation for Papers

    Publication Year: 1969, Page(s): 243-b
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    Freely Available from IEEE

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