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Instrumentation and Measurement Technology Conference Proceedings, 2008. IMTC 2008. IEEE

Date 12-15 May 2008

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Displaying Results 1 - 25 of 439
  • [Front cover]

    Publication Year: 2008 , Page(s): C1
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  • [Copyright notice]

    Publication Year: 2008 , Page(s): ii
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  • 2008 IEEE International Instrumentation and Measurement Technology Conference Proceedings

    Publication Year: 2008 , Page(s): iii
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  • Table of contents

    Publication Year: 2008
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  • Message from the Chairman

    Publication Year: 2008 , Page(s): lviii
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  • The new SI, a unit system for the 21st century

    Publication Year: 2008 , Page(s): lix
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (133 KB) |  | HTML iconHTML  

    The International System of Units (SI) is founded on the seven base units metre, kilogram, second, ampere, kelvin, mole and candela corresponding to the seven base quantities length, mass, time, electric current, thermodynamic temperature, amount of substance and luminous intensity. At the 23rd General Conference on Weights and Measures held in Paris in November 2007, Member States of the Metre Convention adopted Resolution 12 in which they recommended (among other things) that National Metrology Institutes and the BIPM ¿ pursue the relevant experiments so that the International Committee can come to a view on whether it may be possible to redefine the kilogram, the ampere, the kelvin, and the mole using fixed values of the fundamental constants at the time of the 24th General Conference (2011), ¿ initiate awareness campaigns to alert user communities to the possibility of redefinitions and that the technical and legislative implications of such redefinitions and their practical realizations be carefully discussed and considered. The proposal for such redefinitions, while long envisaged in general terms beginning with Maxwell in 1870, is based in detail on two recent papers by Mills, Mohr, Quinn Taylor and Williams (Metrologia 42 (2005) 227-246 and 43 (2006) 227-246). In these papers we proposed redefining the kilogram, ampere, kelvin and mole so that these units are explicitly linked to exactly known values of the Planck constant h, elementary charge e, Boltzmann constant k and Avogadro constant NA, respectively. View full abstract»

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  • Awards and distinctions

    Publication Year: 2008 , Page(s): lx - lxviii
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  • I2MTC 2008 Executive Committee

    Publication Year: 2008 , Page(s): lxix
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  • I2MTC 2008 Technical Program Committee International Board of Advisors

    Publication Year: 2008 , Page(s): lxix
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  • I2MTC 2008 Technical Program Committee

    Publication Year: 2008 , Page(s): lxx - lxxiv
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  • I2MTC Board of Directors

    Publication Year: 2008 , Page(s): lxxiv
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  • I2MTC Tradition

    Publication Year: 2008 , Page(s): lxxv
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  • I2MTC 2008 Tutorials

    Publication Year: 2008 , Page(s): lxxvii - lxxviii
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (133 KB)  

    Provides an abstract for each of the presentations and a brief professional biography of each presenter. The complete presentations were not made available for publication as part of the conference proceedings. View full abstract»

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  • IEEE Instrumentation and Measurement Society

    Publication Year: 2008 , Page(s): lxxix - lxxxiii
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  • Hypercomplex Model of Acoustic Vector Sensor Array with Its Application for the High Resolution Two Dimensional Direction of Arrival Estimation

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (307 KB) |  | HTML iconHTML  

    In this paper, a hypercomplex model of acoustic vector sensor arrays is first introduced. Namely, the hypercomplex number is used to model the four components of the output signals of an acoustic vector sensor in a holistic manner. Then we use the MUSIC-like algorithm based on the hypercomplex eigenvalue decomposition to estimate the direction of arrival (DOA) of the signals. Both theoretical and simulation results show that that the presented method with the same estimation accuracy as the long vector ones can reduce 75% memory requirements and half division operations. View full abstract»

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  • Electronic Instrumentation for Real-time Measurement of Fuel Consumption in EFI Gasoline Engines

    Publication Year: 2008 , Page(s): 6 - 11
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1794 KB) |  | HTML iconHTML  

    This paper presents the design, implementation and test results of an online system for instantaneous measurement and display of fuel consumption in a vehicle. By utilizing the existing available sensors for input, the overall cost and complexity of the system is greatly reduced. The system is intended to help reduce the fuel consumption, thereby reducing the cost of running the vehicle. The instrument is cost effective and easy to install in existing vehicles without major modifications. View full abstract»

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  • Use of a Novel Keypad Biometric for Enhanced User Identity Verification

    Publication Year: 2008 , Page(s): 12 - 16
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3132 KB) |  | HTML iconHTML  

    In everyday life many actions are secured and/or authenticated by use of a secret personal identification number (PIN). This paper reports an improvement to the security afforded by a numeric PIN system through the addition of a covert biometric identification process. This biometric identification process is achieved through the use of a modified keypad incorporating force sensors within the individual keys, these sensors permit the dynamic measurement of applied force and key-press timings, providing an advantage over existing keystroke dynamic techniques which rely on time-domain information only. Details of the experimental setup used are given, and the results from initial tests are reported. In these tests an equal error rate of approximately 10% is obtained and a false acceptance rate of15% with a corresponding false rejection rate of0% has been shown. View full abstract»

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  • A Low-Power Interface for Eddy Current Displacement Sensors in Sub-Micron Applications

    Publication Year: 2008 , Page(s): 17 - 20
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2494 KB) |  | HTML iconHTML  

    In this paper we present a low-power interface for eddy current displacement sensors with digital output. A measurement method and a new front-end circuit are proposed. The front-end circuit demonstrates an excellent thermal stability, high-resolution and low power consumption. The demodulation principle, as well as the interface implementation, is addressed. This interface is introduced for measuring sub-micron displacements in medium to high-resolution applications. The system will consume less than 12 mW, and will have an extremely low thermal drift. The interface circuits will be implemented as a system in a package (SIP). The full-scale range of displacement is 1 mm with 50 KHz signal bandwidth and 11 bits resolution (less than 500 nm). The signal conditioning circuit utilizes a standard 0.35 mum CMOS technology. The discussions are based on simulations and preliminary experimental results, promising a proper operation of the sensor. View full abstract»

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  • Accurate Estimation of Moving Average Models with Durbin's method

    Publication Year: 2008 , Page(s): 21 - 26
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2491 KB) |  | HTML iconHTML  

    The best accuracy for estimated spectra is obtained with parsimonious time series models, which have the smallest number of parameters to guarantee unbiased models. Durbin 's method for the estimation of moving average (MA) parameters uses the estimated parameters of a long autoregressive (AR) model to calculate MA parameters. Probably all pejorative remarks on the quality of Durbin's method in the literature are based on suboptimal or wrong choices for the method of AR estimation or for the order of the intermediate AR model. That AR order should be considerably higher than the order of the best predicting AR model and it should grow with the sample size. Furthermore, the Burg estimates for the AR parameters give the best results because they have the smallest variance of all AR methods with a small bias. The triangular autocorrelation bias of the popular Yule-Walker method of AR estimation can cause large bias errors in finite samples, which makes it unsuited. Durbin's method applied to the proper number of AR parameters estimated with Burg's method outperforms all other known MA estimation methods, asymptotically as well as in finite samples. The accuracy is generally close to the Cramer-Rao bound. View full abstract»

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  • Optimal knot selection for least-squares fitting of noisy data with spline functions

    Publication Year: 2008 , Page(s): 27 - 32
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1633 KB) |  | HTML iconHTML  

    An automatic data-smoothing algorithm for data from digital oscilloscopes is described. The algorithm adjusts the bandwidth of the filtering as a function of time to provide minimum mean squared error at each time. It produces an estimate of the root-mean-square error as a function of time and does so without any statistical assumptions about the unknown signal. The algorithm is based on least-squares fitting to the data of cubic spline functions. View full abstract»

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  • Application of Time Series Models to the Spectral Analysis of Irregular Turbulence Data

    Publication Year: 2008 , Page(s): 33 - 38
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3876 KB) |  | HTML iconHTML  

    Most existing algorithms for the spectral analysis of irregularly sampled random processes can estimate the spectral density until frequencies up to the mean data rate or somewhat higher. A new time series method extended that frequency range with a factor thousand or more, for certain processes. Two requirements have been found for the new algorithm to give useful results. Firstly, at least about ten closest pairs of neighboring irregular observations should have a distance that is less than the minimum resampling distance that has to be used for the discrete-time frequency range. Secondly, a rather low order time series model should be appropriate to describe the character of the data. The consequences and importance of this second demand are studied for irregular turbulence observations with narrow spectral details. Low order models are estimated from equidistant hot-wire observations and from irregularly sampled LDA (Laser Doppler Anemometer) data, obtained from the same turbulence process. The irregular data are resampled with the nearest neighbor method, both with and without slotting. Apart from the usual bias contributions of resampling irregular data, LDA data can give an additional spectral bias if the instantaneous sampling rate is correlated to the actual magnitude of the turbulent velocity. View full abstract»

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  • Investigation of Volume Control for Hearing Aids Using a Modified Coherence Speech Intelligibility Index Measurement

    Publication Year: 2008 , Page(s): 39 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (920 KB) |  | HTML iconHTML  

    This work presents the investigation of volume control for hearing aids using objective speech intelligibility measures. In order to effectively assess the impact of various volume levels on speech intelligibility for the hearing impaired, we propose a new method to measure speech intelligibility by modifying the coherence speech intelligibility index measurement. In the proposed method, the one-third-octave filter bank is applied and the coherence function is calculated for each band to estimate the noise and/or distortion components within the corresponding band. The performance of the proposed method is demonstrated though experiments on speech signals corrupted with additive noise, peak and center clipping distortions. View full abstract»

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  • Using ANOVA in a Microwave Round-Robin Comparison

    Publication Year: 2008 , Page(s): 44 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1836 KB) |  | HTML iconHTML  

    This paper describes a procedure for comparing calibrated nonlinear radio-frequency (RF) measurements performed on a nonlinear device by five different measurement laboratories. The device-under-test is a nonlinear active semiconductor device that is designed to generate a maximum number of harmonic tones. The goal is to obtain a simple, automated method that detects if some laboratory had measurement problems during the measurement campaign. The developed comparison method is based on the analysis of variance (ANOVA) technique. View full abstract»

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  • A reference signal for a dense frequency grid phase calibration

    Publication Year: 2008 , Page(s): 49 - 53
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4208 KB) |  | HTML iconHTML  

    The aim of this paper is to introduce an RF pulse train generator to provide a reference signal for the phase calibration of the large signal network analyser (LSNA) under modulated excitations. View full abstract»

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  • An Original Setup for Power Amplifier AM-AM and AM-PM Characterization

    Publication Year: 2008 , Page(s): 54 - 57
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1372 KB) |  | HTML iconHTML  

    An original measurement system for nonlinear RF power amplifier characterization is presented. This new setup enables AM-AM and AM-PM measurements using one six-port reflectometer as a traveling wave ratio calculator. Experimental results of a commercial power amplifier at 2 GHz are presented and compared to those performed using a vector network analyzer. View full abstract»

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