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Instrumentation and Measurement, IEEE Transactions on

Issue 4 • Date Dec. 1988

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Displaying Results 1 - 25 of 38
  • Electronic compensation of voltage transformers

    Publication Year: 1988, Page(s):652 - 654
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    A method for compensating ratio errors and phase displacements of measuring voltage transformers by a simple electronic circuit is introduced. This electronic compensator keeps the primary winding isolated from the secondary winding, so that it can be applied to voltage transformers in any kind of use. It also works with large load power variations. With this compensation, smaller and cheaper tran... View full abstract»

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  • A digitally programmable temperature controller based on a phase-locked loop

    Publication Year: 1988, Page(s):582 - 585
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A digitally programmable temperature controller is developed based on a phase-locked loop. Temperature under control is converted to frequency form and then compared, in a phase detector, with the reference frequency which corresponds to the target temperature. The detected phase drives the actuator. The frequency difference is also detected by a one-chip microcomputer which changes the reference ... View full abstract»

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  • Technique for measuring the dielectric constant of thin materials

    Publication Year: 1988, Page(s):631 - 636
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A practical technique for measuring the dielectric constant of vegetation leaves and similarly thin materials is presented. A rectangular section of the leaf is placed in the transverse plane in rectangular waveguide, and the magnitude and phase of the reflection coefficient are measured over the desired frequency band using a vector network analyzer. By treating the leaf as an infinitesimally thi... View full abstract»

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  • Voice technology in the instrumentation of the automobile

    Publication Year: 1988, Page(s):586 - 590
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The author discusses the applications of voice technology in modern automobiles. A major goal of this technology is to add artificial intelligence to the instruments of the vehicle to improve the safety and reliability of the vehicle. Two aspects of speech technology are discussed, namely, speech synthesis and speech recognition. Speech synthesis is mainly used to generate verbal warning messages ... View full abstract»

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  • Monitoring permanent-magnet motor heating with phosphor thermometry

    Publication Year: 1988, Page(s):637 - 641
    Cited by:  Papers (4)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The fiber-optic-conveyed, laser-induced fluorescence of a thermographic phosphor was used to measure the surface temperature of the rotor in an operating permanent-magnet motor. The technique uses a pulsed laser to interrogate a surface-bonded film of europium-doped lanthanum oxysulfide for the purpose of determining its temperature-dependent, exponential-decay lifetime. By using digital-delay cir... View full abstract»

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  • A 1/fγ power spectrum noise sequence generator

    Publication Year: 1988, Page(s):615 - 619
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors discuss the design of a noise sequence generator that provides a stationary process that follows a 1/fγ law over a limited frequency band. The kind of noise is generated by passing a white-noise sequence in a digital filter characterized by a frequency-response-squared module proportional to 1/fγ. The design of the digital filter is ... View full abstract»

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  • A recent nationwide comparison of single mode optical fiber attenuation measurements

    Publication Year: 1988, Page(s):655 - 656
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    An interlaboratory measurement comparison was conducted by the Shanghai Institute of Testing Technology in China. Four single-mode fibers, having lengths of 6, 2, 2, and 1.6 km, were used. Measurements of attenuation at 1.3 μm and 1.55 μm gave one standard-derivation spread of 0.01, 0.02, 0.03, and 0.02 dB/km at 1.3 μm and 0.01, 0.09, 0.06, and 0.05 dB/km at 1.55 μm View full abstract»

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  • Deep level transient spectroscopy: instrumentation induced anomalous characteristics

    Publication Year: 1988, Page(s):596 - 599
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors attempted to clarify, compare, and contrast some previously unpublished difficulties encountered in the operation of deep-level transient spectroscopy (DLTS) systems, and describe corrective measures where applicable, including instrumentation and deep level anomalies which may affect capture cross section designations, such as pulse squaring and degeneracy factor effects. Thermal lag ... View full abstract»

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  • Sinewave parameter estimation algorithm with application to waveform digitizer effective bits measurement

    Publication Year: 1988, Page(s):529 - 532
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The authors present a high-performance (i.e. high-precision and high-speed) algorithm to estimate the four parameters of a sine wave from a sampled data record. The estimation errors are derived in closed form, and hence, controllable. The authors then propose a method to measure a digitizers effective bits based on this algorithm. Simulation results indicate that the proposed method gives excelle... View full abstract»

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  • Ultrasonic void estimation system for determination of liquids in microgravity tanks

    Publication Year: 1988, Page(s):642 - 647
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    An ultrasonic measurement technique has been developed for determining the quantity of liquid storage tanks in the microgravity environment. When the void fraction in a vessel is sufficiently small and the liquid wets the vessel, a spherical void interior to the liquid forms. The proposed procedure, the void estimate center technique (VECT), uses an iterative algorithm to compute the center locati... View full abstract»

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  • Logtone crest factors

    Publication Year: 1988, Page(s):656 - 657
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The Schroeder and random methods are compared with a time-frequency-domain swapping algorithm for the crest-factor reduction of logtones used in 1/3 octave analysis. The theoretically stated tendency of logtone-crest factors to grow with the square root of the logarithm of the number of components is confirmed experimentally. This dependence also holds for optimally compressed logtones View full abstract»

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  • Measurement of launching efficiency into multimode optical fibers using semiconductor laser diodes

    Publication Year: 1988, Page(s):561 - 563
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A detailed and systematic study has been carried out of the launching efficiency of light, from semiconductor laser diodes into graded-index multimode optical fiber waveguides. Four different terminations of the fibers were investigated: plane-ends, hemispherical ends, taper-with-hemisphere ends, and roof-top (RT) ends. Besides launching efficiency, the parameters of interest were the various misa... View full abstract»

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  • A high speed data acquisition and analysis system for ultrasonic energy measurements

    Publication Year: 1988, Page(s):515 - 518
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A high-speed microcomputer-based data acquisition and analysis system was designed and constructed. The system was interfaced to an ultrasound sector scanner. The primary application of the system, in this case, was to measure the power spectrum of the backscattered (low-level) ultrasound signal from acoustic inhomogeneous media, such as liver tissue. The system was bench-tested and then tested su... View full abstract»

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  • Determination of DC motor transients using a microcomputer

    Publication Year: 1988, Page(s):600 - 604
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A method is presented to determine DC motor transients using an 8085-based microcomputer. The scheme was tested in the laboratory and results verified. The step response and the back electromotive force (EMF) constant have been determined for a small permanent-magnet DC micromotor. The results have been cross-checked with those obtained from a storage oscilloscope and the specifications of the man... View full abstract»

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  • A drift-compensating precision divider technique using circular data patterns

    Publication Year: 1988, Page(s):533 - 536
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A divider is described which is able to provide precision integer-to-one ratios (or those ratios nearby). The technique for using the divider compensates for most of the drift associated with resistive dividers. Data acquisition and reduction are based on flexible circular data patterns. An application of the divider is described where it is used to establish the relationship between 10-V solid-st... View full abstract»

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  • GPIB and the battle of incompatible languages

    Publication Year: 1988, Page(s):488 - 492
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The author outlines what the IEEE 488.1 and 488.2 standards cover with regard to operating language, what specifications are available, and detailed instructions on how to design a language which facilitates user tolerance. Various features of language design are considered, including mnemonics, minimum uniqueness, the command table, the required characters table, the offset table, and search rout... View full abstract»

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  • Development of a high voltage sensor using a piezoelectric transducer and a strain gage

    Publication Year: 1988, Page(s):564 - 568
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The authors describe the principle and design of an AC high-voltage sensor. When an electric stress is applied, this sensor accurately detects the mechanical strain of a piezoelectric transducer on which a foil strain gage is cemented. Two types of these sensors were designed, and a high-voltage measuring system using them was manufactured for trial. To confirm the frequency response of the trial ... View full abstract»

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  • Impact of digital signal processing on measurement and test instruments

    Publication Year: 1988, Page(s):519 - 524
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The authors discuss the impact of digital signal processing on test instruments and describe the use of a single-chip digital signal processor called TriStar whose architecture has been tailored for the instrumentation environment. TriStar instructions and programming are described, and attention is given to typical applications of TriStar, including averaging, fast Fourier transform, and interpol... View full abstract»

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  • A high performance, variable capacitance accelerometer

    Publication Year: 1988, Page(s):569 - 571
    Cited by:  Papers (2)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A variable capacitance acceleration sensor is described. Manufactured using silicon microfabrication techniques, the sensor uses a midplane, flat plate suspension, gas damping, and overrange stops. The sensor is assembled from three silicon wafers, using anodic bonds to inlays of borosilicate glass. Typical sensor properties are 7-pF active capacitance, 3-pF tare capacitance, a response of 0.05 pF... View full abstract»

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  • High-Q plano-concave resonator with and without Straubel quartz for ultrasonic absorption measurements of liquids

    Publication Year: 1988, Page(s):648 - 651
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A resonator technique for the measurement of the sound absorption coefficient of liquids is described. It is designed for use at low frequencies with reasonably small sample values. The construction of a high-precision cylindrically shaped specimens cell is shown and results for different versions of the resonator are presented. The relative merits of using a Straubel quartz instead of a disc-shap... View full abstract»

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  • Ultrasonic distance measurement for linear and angular position control

    Publication Year: 1988, Page(s):578 - 581
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A robot-arm positioning control is described. It makes use of a microprocessor-based ultrasonic system and of a novel time-of-flight measurement technique. The experimental system consists of a three aligned ultrasonic transducers mounted on a rod. Two transducers work as receivers, while the third works both as a transmitter and a receiver. The system achieves a positioning accuracy of ±0.... View full abstract»

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  • Interfacing sensor assemblies with windowless cockpit displays

    Publication Year: 1988, Page(s):501 - 505
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    An interface for converting aircraft instrument information into a video display was created. Due to the limited development time available, the interface was divided into two subsystems. The goal of the division was to allow concurrent work on two major system components. The division used greatly aided the development, test, and calibration tasks. The key to being able to develop and test them s... View full abstract»

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  • A modular and innovative software package for multichannel data acquisition

    Publication Year: 1988, Page(s):493 - 496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A software package called Acquire is described which can control multichannel data acquisition equipment, collect and archive the data, analyze and present results in user-defined plot formats, and link together the individual tasks of a repetitive experiment to produce a fully automated turn-key solution. It is concluded that the modular structure of the described software can be customized quick... View full abstract»

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  • Measurement of instantaneous losses in switching power devices

    Publication Year: 1988, Page(s):541 - 546
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A novel technique is proposed for measuring instantaneous power and energy losses in static switching devices during the different operating intervals (turn-on delay, rise time, on-state, turn-off delay, full time, and off-state) of a switching cycle. To this end, a system for measuring voltages and currents is used, based on sampling at 200 Ms/s for data acquisition. The data are then transferred... View full abstract»

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  • Accurate digital control and rotation of the phase of microwave signals

    Publication Year: 1988, Page(s):626 - 630
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A method of remotely controlling the phase and phase rates of low-frequency reference signals using digital techniques is described. These signals can, in turn, be used to control the phase of a microwave local oscillator in a phase array. The system, which was designed to control the phase of the local oscillators in a radio astronomy array called the Australian Telescope, gives phase resolution ... 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
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