IEEE Transactions on Instrumentation and Measurement

Issue 4 • Dec. 1981

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Displaying Results 1 - 25 of 29
  • Table of contents

    Publication Year: 1981, Page(s): 1
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    Freely Available from IEEE
  • [Inside front cover]

    Publication Year: 1981, Page(s): c2
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  • On manuscript submission, processing, review, and publication

    Publication Year: 1981, Page(s): 237
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  • Broad-band high-speed microwave power sensor using hot carriers in semiconductor

    Publication Year: 1981, Page(s):238 - 242
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1183 KB)

    The principal characteristics of a semiconductor power sensor based upon the temperature rise of hot carriers are investigated. A method of designing a broad-band coaxial mount is described. The hot-carrier power sensor is fabricated by a whisker contact to p-type germanium. A sensor using optimum resistivity results in a noise equivalent power of -58 dBm/Hz1/2 with a 60-dB dynamic rang... View full abstract»

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  • A simple microwave interferometer for measuring effective thickness of dielectric slabs

    Publication Year: 1981, Page(s):243 - 247
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1099 KB)

    A Michelson-type unequal path interferometer for measuring the effective thickness of dielectric slabs is presented. Due to unequal paths, this interferometer is frequency dependent so that frequency tuning of the source controls the phase difference between the two paths and serves as a phase shifter. FM modulation of the source enables determination of the null point with an electronic sensitivi... View full abstract»

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  • A cascade phase-sensitive detector: II — Phase filter synthesis

    Publication Year: 1981, Page(s):247 - 250
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    For pt.I see ibid., no.1, p.3-6 (March 1980). A synthesis procedure of the phase filter is described. The procedure consists of the Fourier-series approximation= of the specified transfer function and the mechanization of each term in the series by means of the cascadable phase-sensitive detectors (CPSDs). The prototype filter implemented by four-stage CPSD confirms the procedure. The effect of in... View full abstract»

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  • A SQUID magnetometer using a niobium thin-film microbridge

    Publication Year: 1981, Page(s):251 - 254
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1372 KB)

    A new type of superconducting quantum interference device (SQUID) using a submicrometer-width niobium thin-film microbridge on a sapphire substrate is described. This thin-film SQUID is suitable for mass production. It is mechanically rigid and resists mechanical shock and heat cycling. The SQUID is mounted in a niobium two-hole superconductive ring block to decrease its inductance, and an energy ... View full abstract»

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  • A new system for measuring low DC currents

    Publication Year: 1981, Page(s):254 - 258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1147 KB)

    A system for measuring low DC current covering a wide range of currents is presented. It eliminates the need of switches in the circuit where the measured current flows. The system design simplifies the ranging problem and paves the way for easier development of instrumentation where low DC currents should be measured. View full abstract»

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  • Microprocessor-controlled drill analyzer

    Publication Year: 1981, Page(s):258 - 262
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2657 KB)

    A microprocessor-controlled instrument was developed for automatic measurement of drill geometry. The position of a reciprocating stylus is measured upon contact with the sample via an analog-digital converter and a linear variable differential transformer (LVDT). Either a guarded stereo phono cartridge or an electrical contact stylus senses contact. Output data are digital readouts plus analog pl... View full abstract»

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  • Intermodulation measurement using a microcomputer

    Publication Year: 1981, Page(s):262 - 264
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (838 KB)

    An intermodulation distortion measurement technique using a microcomputer is studied. This approach is based on the theory deduced via a stochastic method instead of a series technique; it is also useful for nonlinear amplifiers that do not have smooth characteristics, such as a piecewise-linear limiter, a class-C amplifier, an A-D converter, etc.... This technique also allows to measure the inter... View full abstract»

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  • SNR analysis of log companding for use in a digital recording/data analysis system

    Publication Year: 1981, Page(s):265 - 270
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1286 KB)

    It is shown that analog log compression of a band-limited signal prior to A/D conversion can be used to compress a wide dynamic range signal and recover a sampled representation the original signal by inverse log compression of the log-compressed samples without introducing aliasing error. The accuracy of the overall companding function has been expressed analytically in closed form as an SNR meas... View full abstract»

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  • Range data entry techniques using a laser spot scanner and two linear solid-state image sensors

    Publication Year: 1981, Page(s):270 - 273
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1862 KB)

    A three-dimensional (3-D) range-finding technique, using a laser spot scanner and two linear solid-state image sensors is proposed. Both the solid-state nature of image sensors and the avoidance of correspondence problem make it possible to obtain the range data of 3-D objects with high accuracy. View full abstract»

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  • Clock synchronization experiment via SYMPHONIE satellite

    Publication Year: 1981, Page(s):273 - 277
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    Clock synchronization experiment between ground stations in Beijing and Shanghai and also between Nanjing and Shanghai were carried out in March, 1979, by the National Institute of Metrology of China. Based on the results of this experiment, two Cs-atomic clocks, one located in Raisting (Federal Republic of Germany) and the other in Nanjing (China) were compared from June 18 to 27, 1979, via SYMPH... View full abstract»

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  • On the signal-to-noise ratio and short-term stability of passive rubidium frequency standards

    Publication Year: 1981, Page(s):277 - 282
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    Results are presented on theoretical calculations of the signal-to-noise ratio and of the short-term stability realizable in passive rubidium frequency standards. Measurements made on systems using either the separate hyperfine filter or the integrated hyperfine filter approach are reported. It is concluded that shot noise produced by the lamp at the photodetector is responsible for the observed w... View full abstract»

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  • Coherence limits for very-long-baseline interferometry

    Publication Year: 1981, Page(s):283 - 286
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (997 KB)

    The quality of the frequency standards used in very-long-baseline interferometry limits the coherent integration time and the accuracy of geodetic experiments except in special cases when clock instabilities can be made to cancel out by using differential interferometry. Formulas are derived for estimating the coherence of these interferometers from the Allan variances of the frequency standards. ... View full abstract»

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  • Design for automated testing of analog data channels in a PCM switching system

    Publication Year: 1981, Page(s):287 - 290
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1171 KB)

    Semi-automatic suboptimal tests of analog data channels in a time-multiplexed pulse-code modulation (PCM) digital switching system are presented. The intent of the approach used was to provide a computer-controlled go, no-go testing capability for the analog I/O channels of the switch. Interplay between hardware design constraints and desired testability features are discussed. Results of maintain... View full abstract»

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  • A programmable LF voltage ratio transformer using CMOS switches

    Publication Year: 1981, Page(s):290 - 292
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    A programmable 12-bit voltage ratio device having a voltage rating of 0.1 times frequency and a terminal linearity error of less than 1×10-7 at 10-80 Hz is described. The compact design incorporates a 3-stage ratio transformer and it accommodates the use of solid-state switches having an ON-resistance of 100 Ω. View full abstract»

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  • A Wien-bridge oscillator with high-amplitude stability

    Publication Year: 1981, Page(s):292 - 294
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    A FET-stabilized Wien-bridge oscillator, capable of maintaining an output voltage of 5 V to an accuracy of 0.02 percent with total harmonic distortion 0.01 percent, is described. A linear model is presented for the amplitude-stabilizing control loop from which useful design relationships are developed. View full abstract»

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  • An autoranging voltmeter circuit without range resistors

    Publication Year: 1981, Page(s):294 - 296
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (890 KB)

    An autoranging circuit for digital voltmeter without range resistors is presented. The circuit uses a microprocessor-based time-averaging technique. This technique can achieve an accuracy comparable to a 41/2 digit DVM in 5-decade range. An autozero and autopolarity circuit is also presented. View full abstract»

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  • A linear temperature-to-frequency converter using a thermistor

    Publication Year: 1981, Page(s):296 - 299
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    A novel technique for output frequency linearization of a thermistor-astable multivibrator is presented. An analytical expression for the linearity condition is obtained and demonstrated experimentally. The astable multivibrator incorporating this technique is shown to offer an approximately linear temperature-to-frequency conversion in the range 0 to 86°C with a sensitivity of 21 Hz/ ... View full abstract»

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  • A variable-threshold digitizer for photodiode arrays

    Publication Year: 1981, Page(s):299 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1399 KB)

    A versatile digitizer circuit for a photodiode-array output has been developed. Because of a dual-threshold system, the circuit can compensate for the inadequate slew rate of the photodiode output amplifier. The adaptable nature of the thresholds provides a functional digitizer for pictures having slowly changing local characteristics. The adaptive nature of this digitizer is an essential feature ... View full abstract»

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  • Digital Q measurement of audio-frequency inductors

    Publication Year: 1981, Page(s):301 - 303
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (847 KB)

    A measurement technique is presented that is based on the idea of realizing a negative conductance which is variable under the control of a frequency and which uses a switched capacitor in conjunction with a unity gain voltage buffer. Experimental results confirm the utility of the approach. The technique can be extended to other frequency ranges with the use of high-speed gallium arsenide MESFET ... View full abstract»

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  • A microwave bridge method for measuring the complex permittivity of liquids

    Publication Year: 1981, Page(s):303 - 305
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (781 KB)

    A microwave bridge method is discussed for measuring the complex permittivity of dielectric materials. The underlying principle of the technique along with the experimental results is presented. The complex permittivities of benzene, carbon tetrachloride, petrol, and kerosene are illustrated at a few frequencies in X-band. The variation of the dielectric properties of petrol-kerosene mixtur... View full abstract»

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  • A generalized method for de-embedding of multiport networks

    Publication Year: 1981, Page(s):305 - 307
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (857 KB)

    The concept of desegmentation proposed earlier for analysis of two-dimensional microwave circuits is used to evolve a generalized method for de-embedding of multiport devices (or networks). The formulation is in terms of S-parameters of the embedded network and those of the embedding network. The proposed technique is illustrated by an example of three-port circuit. View full abstract»

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  • A model for 1/f noise

    Publication Year: 1981, Page(s):307 - 309
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (799 KB)

    As in many other fields, 1/f noise plays an important role in precise electromagnetic measurements. Starting from the assumption that noise is generated by fluctuations of a parameter, subject to a diffusion equation, a model is developed which for samples of finite size produces a 1/f spectrum over a wide frequency range. 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.

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