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[1992] Conference Record IEEE Instrumentation and Measurement Technology Conference

12-14 May 1992

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Displaying Results 1 - 25 of 142
  • Recursive random sampling strategy for a digital wattmeter

    Publication Year: 1992, Page(s):577 - 582
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    A recursive random sampling strategy is proposed for the implementation of a digital broadband wattmeter. In this strategy each sampling instant is obtained by adding a prefixed constant lag plus a random increment to the preceding one. The formula for the evaluation, in terms of accuracy and bandwidth of errors arising from the sampling strategy and the filtering algorithms, is given and discusse... View full abstract»

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  • An undergraduate laboratory experiment of 35 years ago whose time has yet to come

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (71 KB)

    Summary form only given. An experiment on probability for undergraduate electrical engineering students was devised in 1958, and was met with wide acceptance at the time. It was later realized that the principle employed might find application in the area of precision AC-to-DC transfer instrumentation for the measurement of fluctuating voltage. Since precision transfer devices are still largely an... View full abstract»

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  • IMTC '92. IEEE Instrumentation and Measurement Technology Conference (Cat. No.92CH3151-8)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (31 KB)
    Freely Available from IEEE
  • A VXI-bus based data acquisition and processing system for measurements on electric power systems

    Publication Year: 1992, Page(s):460 - 465
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The authors describe a VXIbus-based data acquisition and processing system that is used for online accurate measurements of various quantities of a three-phase system: harmonic amplitude and phases of voltages and currents, RMS values, various powers, total harmonic distortion, and statistical behavior and time trends of these quantities. Problems of real-time measurement and control are resolved.... View full abstract»

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  • On-line monitoring of electrodynamic effects on power transformers windings

    Publication Year: 1992, Page(s):466 - 469
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A strategy for protecting power transformers, based on the possibility of taking measurements on machines under real operating conditions, is discussed. A measurement technique for determining the online variations of stray reactance of transformers due to short-circuit events is reported. This parameter can be indicative of winding geometry; hence it makes possible the setting up a diagnostic sys... View full abstract»

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  • Use of a visually oriented software development tool for creating automated test programs

    Publication Year: 1992, Page(s):249 - 254
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The creation of a test program using the VEE-Test software development tool is described. The test sequence is modeled with VEE-Test. The model is a series of visual objects of icons connected together to show the flow of the test. To make the model actually run the physical test, I/O drivers are added to the model. These instrument control drivers are included in the software. When the user runs ... View full abstract»

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  • Detection of electrical corona on low frequency radio transmit antenna systems

    Publication Year: 1992, Page(s):470 - 473
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Low frequency radio transmitting antennas are used for a variety of applications in marine navigation and submarine communications. In many applications, the limiting output power of the antenna system is determined by the onset of electrical corona, which occurs on antenna elements where electric fields are very high. The corona is extremely damaging to antenna components and drains power from th... View full abstract»

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  • Robotic sensing and perception as the AI frontier of the I&M

    Publication Year: 1992, Page(s):256 - 259
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The authors report on the perception/action hierarchy of an intelligent robot system. World models provide a common abstraction representation of multisensor information. At the perception level, the world model is analyzed to infer relationships between different objects and to assess the consequences of system's actions. Two types of sensors are employed: proprioceptors for measurement of intern... View full abstract»

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  • Weighted detector array for linear position sensing

    Publication Year: 1992, Page(s):409 - 413
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The weighted detector array method for the measurement of linear position is proposed. It is based on the principle of measuring incident optical power distribution on a detector array by a built-in parallel weighting and summing structure. The method can achieve significant position resolution. Dynamic range limitation is compensated by the use of adaptive control, so that for long travel a large... View full abstract»

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  • A method of measuring finger pressure during keyboard data entry

    Publication Year: 1992, Page(s):57 - 58
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    Utilizing force sensing resistor technology, an initial system has been devised that measures applied finger pressure during keyboard data entry without impairing the normal accessibility of the keys. The system has been developed to support a more quantified study of the various ergonomic issues associated with occupations requiring considerable data entry by keyboard. The system is designed to o... View full abstract»

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  • Prototype fiber-optic pressure cell for stress monitoring

    Publication Year: 1992, Page(s):475 - 479
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A fiber-optic pressure cell (FOPC) device is presented for measurement of real stress in the construction and mining industries. The device is miniature, completely electromagnetic-interference (EMI) -free and directly compatible with optical data transmission systems. The sensing element of the device is based on a highly birefringent (HB) polarization-maintaining optical fiber. The instrumentati... View full abstract»

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  • Multi-stage IIR decimation filter design technique for high resolution sigma-delta A/D converters

    Publication Year: 1992, Page(s):561 - 566
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The authors present a design technique for a multistage halfband filter with infinite-impulse-response (IIR) structure to enhance the effective resolution of oversampling analog-to-digital (A/D) converters. A series of six cascaded IIR filters is implemented to obtain more than 18-b of effective resolution for a digital signal with 12-b resolution from the DSP56ADC16 converter. Since this proposed... View full abstract»

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  • A low-cost, accurate and fast capacitive displacement sensor with microcontroller interfacing

    Publication Year: 1992, Page(s):414 - 417
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A high-performance, capacitive displacement measuring system is described. Using a very linear oscillator, shielding and a three-signal approach, most of the errors are eliminated. The accuracy amounts to 1 μm over a 1-mm range. Since the output of the oscillator can be directly connected to a microcontroller, an analog-to-digital (A/D) converter is not needed. The system was tested in a fully ... View full abstract»

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  • The design and analysis of an improved high air flow meter with analog/digital filters

    Publication Year: 1992, Page(s):600 - 605
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    High air flow meters in the range of 0.0 SLM (standard liters per minute) to 200.0 SLM and using a built-in microbridge sensor in flow housing induce a significant amount of turbulence noise in the output signal. The authors analyze the sensor output signal and introduce an analog/digital (A/D) design to reduce the noise and to realize the industrial standard output range of 1.00 VDC to 5.00 VDC. ... View full abstract»

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  • Design of programmable FIR digital filter to optimize the detection of signals embedded in white noise

    Publication Year: 1992, Page(s):224A - 224F
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The order of a multiband FIR filter is reduced using a programmable passband filter for normalized frequencies. The parameters of a single-band passband filter are extracted from the parameters of a normalized lowpass digital FIR filter using a bilinear transformation. The stopbands of the low-pass digital filter are designed to limit the maximum response from a strong sinusoid, and also to minimi... View full abstract»

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  • PVDE-ultrasound transducer arrays with a reduced number of elements using matched receiver arrays

    Publication Year: 1992, Page(s):59 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A combination of transmitting and receiving ultrasound arrays is presented and analyzed. The arrays are composed of polyvinylidene-fluoride (PVDF)-membrane transducers, a new type of transducer well suited for applications in low-impedance media like air. PVDF transducers offer a broadband impulse response. Computer simulations, as well as measured characteristics, are presented and show the effec... View full abstract»

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  • Method for angular alignment of birefringent fibers in fiber-optic pressure/strain measurement

    Publication Year: 1992, Page(s):480 - 484
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A method for angular alignment of principal birefringence axes of a highly birefringent (HB) polarization-maintaining optical fiber is presented. The method is based on longitudinal, strain-induced cross-coupling phenomena which occur in HB fibers, and it can be directly applied to construct a fiber-optic pressure or strain sensor that is independent of disturbing thermal effects. The method is al... View full abstract»

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  • On the zero- and first-order interpolation in synthesized sine waves for testing purposes

    Publication Year: 1992, Page(s):126 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors report on the quality requirements of synthesized sine waves reconstructed through a zero or first-order hold intended for testing purposes, in particular, when a switching demodulator is used. In this case, there is a need for great spectral purity only near the carrier rather than throughout the band. It is shown that the best method for obtaining great spectral purity near the synth... View full abstract»

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  • A virtual instrument for the measurement of the characteristics of magnetic materials

    Publication Year: 1992, Page(s):346 - 349
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The authors present a completely digital method for fast and accurate measurement of the magnetic characteristic (magnetization curve, hysteresis loop and total losses) of magnetic materials under cyclic magnetization. The mathematical basis of the method is discussed and applied to the realization of a virtual instrument for these measurements. The results of experiments on ferrosilicon plates an... View full abstract»

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  • High-accuracy sampling wattmeter

    Publication Year: 1992, Page(s):568 - 572
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A high-accuracy sampling wattmeter was developed to investigate the feasibility of using waveform sampling techniques for making very accurate power measurements at frequencies from 50 Hz to 1000 Hz. The goal was to build an instrument with an uncertainty of less than ±50 ppm over these frequencies. The new wattmeter uses 16-b converters and includes a two-stage current transformer in one o... View full abstract»

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  • A chess playing robot: lab course in robot sensor integration

    Publication Year: 1992, Page(s):261 - 264
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    To obtain practical experience in intelligent robotics, a laboratory course has been developed in which students have to create a chess-playing robot. The system has to detect the move of a human opponent and has to take appropriate action. Beside knowledge about the integration of sensing and control of the robot arm, the students gain experience in working in a team to realize a medium-size proj... View full abstract»

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  • Continuous measurement of moisture in nonconducting materials

    Publication Year: 1992, Page(s):419 - 421
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A microwave-based system has been developed for the continuous measurement of the moisture in nonconducting materials. The system was implemented on conveyor belts carrying coarse coal. To obtain a reliable measurement for this application, several other factors that influence the microwave technique were investigated. These factors are the mass per unit area, the ash content, and the temperature.... View full abstract»

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  • Cable characteristics for FieldBus

    Publication Year: 1992, Page(s):607 - 611
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    FieldBus, an emerging instrument standard, provides data communication among low-power field instruments. The standard specifies a low-speed data rate, under 100 kb/s using single- and multiple-twisted-pair cables at distances up to 1900 m. The intent is to allow FieldBus instruments to be retrofitted to installed cable currently used with low-frequency, analog-signaling instruments. FieldBus repr... View full abstract»

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  • A custom integrated circuit comparator for high-performance sampling applications

    Publication Year: 1992, Page(s):437 - 441
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The design and performance of an application specific integrated circuit (ASIC) comparator that has been optimized for equivalent-time waveform sampling applications is reported. The comparator, which has been fabricated with an 8.5-GHz fT, bipolar silicon process, features a bandwidth of >2 GHz, a settling-time accuracy of 0.1% in 2 ns, and almost total elimination of therm... View full abstract»

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  • Method for electroacoustic transducer transient suppression

    Publication Year: 1992, Page(s):225 - 229
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The problem of determining the driving voltage waveform required to stimulate an electroacoustic transducer so as to produce no transients in the sound radiated into the surrounding fluid medium is considered. The goal is to produce a sound wave in the fluid that is a section of a steady-state sine. The method of analysis involves evaluating an equivalent circuit for the transducer of interest. In... View full abstract»

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