7th IEEE Conference on Instrumentation and Measurement Technology

13-15 Feb. 1990

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Displaying Results 1 - 25 of 81
  • How good is your calibration? A post-mortem examination and recalibration

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (24 KB)

    Summary form only given. It is pointed out that the standard network analyzer calibration procedure suffers from several drawbacks. The test patterns, for instance, often reside on a wafer different from that being tested. The normal procedure is to measure only a single set of calibration patterns instead of collecting a statistically significant sample spanning the wafer. Wafer thickness uniform... View full abstract»

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  • Conference Record. IEEE Instrumentation and Measurement Technology Conference (Cat. No.90CH2735-9)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (81 KB)
    Freely Available from IEEE
  • Non-contact capacitive torque sensing on a rotating conductive axis

    Publication Year: 1990, Page(s):136 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A capacitive torque sensor in which two angular displacement sensors are spaced a well-defined distance apart is proposed. The rotor of each of these capacitive displacement sensors is composed of an array of electrodes connected to sine waves with phase angles in the sequence -0°-90°-180°-270°. These voltages are capacitively coupled from the stator to the rotor. The stator is als... View full abstract»

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  • A robotic tactile perception system concept

    Publication Year: 1990, Page(s):132 - 135
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    An experimental robotic tactile system is under development to characterize and identify three-dimensional (3-D) objects through a procedure of active sequential exploration. The experimental setup is described, and a data fusion technique for precise object identification is presented. Preliminary test results demonstrate that overlapping tactile exploration allows recovery from sensor/target mis... View full abstract»

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  • Non-contact electro-optic sampling system in subpicosecond regime

    Publication Year: 1990, Page(s):152 - 158
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    An advanced external electrooptic sampling system is developed for use in high-speed electronic devices and circuit characterization of the subpicosecond regime. The system is designed on the basis of an electromagnetic field analysis, which clarifies system performance parameters such as sensitivity, temporal resolution, and invasiveness. One of the novel features of the system is sophisticated p... View full abstract»

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  • Signal evaluation and measurement techniques in a single cell hybrid tactile sensor for large object manipulation

    Publication Year: 1990, Page(s):126 - 131
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    It is noted that tactile sensors based on piezoelectric active surfaces require complex and advanced analog and digital signal processing circuitry in order to provide the best evaluation of the information resulting from the mechanical action of the manipulated object. Following a complete analysis of the hybrid structure and functionality of two previous realizations, the authors have recognized... View full abstract»

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  • Limitations of the IEEE pulse standards and suggested improvements

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    IEEE Std 194 assumes that the polarity of a pulse being measured is known to the user who wishes to extract its parameters. It is pointed out that this is often not the case when the only information about the signal in question is contained in a waveform record. The author proposes an unambiguous depiction of the record as a train of transitions allowing the extraction of `pulselike' parameters. ... View full abstract»

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  • On the use of signals with a constant signal-to-noise ratio in the frequency-domain

    Publication Year: 1990, Page(s):360 - 366
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    It is pointed out that most estimation methods, when applied to linear time-invariant systems, do not take into account the noise on the input signal. It is well known that these methods generate biased estimates when input noise is present. It is demonstrated that unbiased pole-zero estimates of the device under test (DUT) can still be obtained when an input signal with a constant signal-to-noise... View full abstract»

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  • Precision low frequency noise measurement

    Publication Year: 1990, Page(s):107 - 110
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Techniques have been developed for conveniently making precision (1%) noise spectral density measurements in the 10-3-kHz to 35-Hz or higher range. Application interest is particularly in the area of amplifier l/f noise measurement. Measurements are made by overlap averaging of the fast Fourier transform (FFT) with analog preconditioning of the noise. Calibration of the measure... View full abstract»

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  • Electrodynamics of materials for dielectric measurement standardization

    Publication Year: 1990, Page(s):2 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Dielectric reference materials are analyzed in light of the fundamental requirements of linearity, homogeneity, and isotropy. The author presents generalized frequency- and temperature-dependent dispersion relations which allow the prediction of broadband dielectric behavior from limited measurement data, determination of valid modal field structure in cavity or waveguide fixtures, and identificat... View full abstract»

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  • The VXIbus from an instrument designer's perspective

    Publication Year: 1990, Page(s):280 - 285
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The VXIbus specification defines a technically sound modular instrument standard addressing electrical, mechanical, electromagnetic compatibility (EMC)/power, and communication requirements for modules. The standard does not cover certain information that is critical to the instrument module designer. For this reason, it becomes necessary for a VXIbus instrument manufacturer to define an internal ... View full abstract»

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  • New triggering system and signal processing in digital oscilloscopes

    Publication Year: 1990, Page(s):148 - 151
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The authors have developed a 200-M sample/s digital oscilloscope that realizes the multigate triggering function and incorporates a 32-b RISC-(reduction-instruction-set-computer-) type processor and a floating-point coprocessor to execute various functional calculations and to display data on the screen. They describe a unique waveform triggering system (multigate triggering) and discuss the imple... View full abstract»

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  • Parameter estimation in strongly nonlinear circuits

    Publication Year: 1990, Page(s):378 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The combination of the generalized Volterra approach to computing the nonlinear steady-state output and a maximum likelihood estimator results in a powerful parameter estimation method for strongly nonlinear circuits. As a result, it is possible to determine parameters which cannot be measured or are difficult to measure. The proposed approach is illustrated by the example of an inverting amplifie... View full abstract»

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  • Integrating sensors into a standard control architecture for robotic applications

    Publication Year: 1990, Page(s):120 - 125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The problem of the integration of sensors into a coherent system for robotic applications is addressed by presenting a standard robot control architecture, the NASA/NBS Standard Reference Model for Telerobot Control System Architecture (NASREM). NASREM has three hierarchies: a task decomposition hierarchy, a world modeling hierarchy, and a sensory processing hierarchy. Goals at each level of the t... View full abstract»

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  • A review of IEEE pulse standards 194 and 181

    Publication Year: 1990, Page(s):296 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The author presents a brief history of the development of the IEEE pulse standards and outlines their organization and content with emphasis on old terms with new names and new terms. It is noted that these standards (and their International Electrotechnical Commission counterparts) are applicable to a wide range of pulse measurement situations ranging from automatic instruments that digitize, sto... View full abstract»

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  • High-speed motion analysis as a measurement tool

    Publication Year: 1990, Page(s):67 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    It is noted that, as engineering, manufacturing, packaging, and quality testing processes have become faster and more complex, the need to record and analyze events that happen in milliseconds or less has become critical. Companies in electronics, aerospace, automotive, packaging, paper converting, and textiles are using high-speed motion analysis to diagnose and solve problems from basic research... View full abstract»

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  • A microstep controller of a DC servomotor

    Publication Year: 1990, Page(s):60 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A microstep controller of a DC servomotor has been developed for accurate positioning and smooth movement at low-speed rotation. It consists of digital and analog positioning loops. Dividing one period of quadrature sinusoidal signals, generated by an incremental encoder attached to a motor shaft, into four quarter sections, the digital loop controls the movement between the sections. The analog l... View full abstract»

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  • On the measurement and the modelling of the correlated noise sources corrupting the marine geological echosounding experiments

    Publication Year: 1990, Page(s):353 - 359
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The modeling of the power spectral density of correlated noise sources in acoustic measurements in a marine environment is considered. The Belgian oceanographic vessel, the Belgica, was used for measurements of the noise generated by helixes, engines, stabilizers, the `fish' incorporating the transducers, the waves, and the marine background noise. Classical estimators, such as the periodogram, as... View full abstract»

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  • A simple method for the evaluation of microwave mixer diodes

    Publication Year: 1990, Page(s):104 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The authors describe a novel method for the evaluation of the various microwave (MW) mixer diodes which can be used in electron paramagnetic resonance (EPR) spectrometers. The advantage of this method over other methods is that it is optimized for EPR applications and determines the optimum operating conditions for each MW diode. The authors describe the instrumentation and the experimental proced... View full abstract»

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  • A study on the metal-flanged open-ended coaxial line terminating in a conductor-backed dielectric layer

    Publication Year: 1990, Page(s):43 - 46
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A spectral domain approach is used to analyze aperture fields and aperture admittance of an open-ended coaxial line terminated by a conductor-backed dielectric layer. The aperture admittance and capacitance at various frequencies and thicknesses are calculated for various dielectrics. It is shown that, for d⩾2b, the results are very close to those for the infinitely thick die... View full abstract»

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  • CAMAC, an ideal high-performance data acquisition standard

    Publication Year: 1990, Page(s):272 - 279
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    It is suggested that CAMAC (computer-automated measurement and control) provides an ideal solution for high-performance data acquisition system requirements, such as high-accuracy A/D (analog-to-digital) conversion, a large channel capacity, and physically distributed channels. A wide variety of CAMAC I/O modules provides the analog and discrete interfaces needed for high-performance systems. Thes... View full abstract»

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  • Additional information from flowmeters via signal analysis

    Publication Year: 1990, Page(s):187 - 193
    Cited by:  Papers (6)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The need to enhance the performance of process instrumentation systems by applying modern signal processing techniques has been identified as one of the priority areas for research and development in process instrumentation and process control. It is pointed out that this performance enhancement can be in the form of extracting additional information from flow sensors beyond the customary requirem... View full abstract»

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  • Digital spectra of non-uniformly sampled signals: theories and applications. IV. Measuring clock/aperture jitter of an A/D system

    Publication Year: 1990, Page(s):145 - 147
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    A method, based on asynchronous spectral averaging, to measure the standard deviation of a clock/aperture jitter of an A/D (analog-to-digital) system is proposed. A sine wave with frequency f 0 is used as an input test signal to a B-bit A/D system. Spectral averaging is then performed on many asynchronously acquired data records with length N. The jitter standard devia... View full abstract»

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  • A standardized instrument programming language based on IEEE Std 488.2

    Publication Year: 1990, Page(s):306 - 310
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The author describes the features of TMSL (Test and Measurement System Language) and how they relate to compatibility. TMSL implements a tree-structured command set, rather than a traditional flat instrument language, allowing keywords to be reusable and identifiable in context. Reusable keywords also allow for simple and regular mnemonic generation rules. TMSL also addresses parameters through th... View full abstract»

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  • Measurement of frequency response functions in noisy environments

    Publication Year: 1990, Page(s):373 - 377
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The geometric average is proposed as an alternative averaging technique for frequency response function measurements. It is shown that the geometric mean produces almost unbiased measurements, even if the input and output measurements are both disturbed by (normal distributed) noise. The proposed method is compared with the classical H1 and H2 measuring meth... View full abstract»

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