Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Instrumentation and Measurement, IEEE Transactions on

Issue 12 • Date Dec. 2011

Filter Results

Displaying Results 1 - 25 of 36
  • Table of contents

    Publication Year: 2011 , Page(s): C1 - 3733
    Save to Project icon | Request Permissions | PDF file iconPDF (47 KB)  
    Freely Available from IEEE
  • IEEE Transactions on Instrumentation and Measurement publication information

    Publication Year: 2011 , Page(s): C2
    Save to Project icon | Request Permissions | PDF file iconPDF (45 KB)  
    Freely Available from IEEE
  • Editor-in-Chief's Year-End Message

    Publication Year: 2011 , Page(s): 3734 - 3735
    Save to Project icon | Request Permissions | PDF file iconPDF (64 KB) |  | HTML iconHTML  
    Freely Available from IEEE
  • Message from Incoming Editor-in-Chief

    Publication Year: 2011 , Page(s): 3736 - 3737
    Save to Project icon | Request Permissions | PDF file iconPDF (68 KB) |  | HTML iconHTML  
    Freely Available from IEEE
  • List of Reviewers

    Publication Year: 2011 , Page(s): 3738 - 3746
    Save to Project icon | Request Permissions | PDF file iconPDF (48 KB)  
    Freely Available from IEEE
  • Improving Estimation of Vehicle's Trajectory Using the Latest Global Positioning System With Kalman Filtering

    Publication Year: 2011 , Page(s): 3747 - 3755
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (780 KB) |  | HTML iconHTML  

    This paper proposes several extensive methods to predict the future location of an automobile. The goals of this paper are to find a more accurate way to predict the future location of an automobile by 3 s ahead, so that the prediction error can be greatly reduced with the innovative idea of merging global-positioning-system (GPS) data with geographic-information-system (GIS) data. The improvement starts by applying existing techniques to extrapolate the current GPS location. Comprehensive Kalman filters (KFs) are implemented to deal with inaccuracy in the different identified possible states an automobile could be found in, which are identified as constant locations, constant velocity, constant acceleration, and constant jerks. Then, the KFs are set up to be part of a interacting-multiple-model (IMM) system that provides the predicted future location of the automobile. To reduce the prediction error of the IMM setup, this paper imports an iterated geometrical error-detection method based on GIS data. The assumption that the automobile will remain on the road is made; therefore, the predictions of future locations that fall outside are corrected accordingly, making a great reduction to the prediction error. The actual experimental results validate our proposed system by reducing the prediction error to around half of what it would be without the use of GIS data. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Model-Driven Domain-Specific Scripting Language for Measurement-System Frameworks

    Publication Year: 2011 , Page(s): 3756 - 3766
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1077 KB) |  | HTML iconHTML  

    A measurement-domain-specific language, which is based on a model-driven paradigm for measurement-test-procedure definition, instrument configurations, and task synchronization, is proposed. This formal language, which is particular for a specific measurement field, aims at specifying complete, easy-to-understand, easy-to-reuse, and easy-to-maintain applications efficiently and quickly by means of a script. The script is checked and integrated into the existing software framework automatically by a specific parser-builder chain, in order to produce the measurement application. Constructs for abstracting key concepts of the domain allow the test engineer to write more concise and higher level programs by natural language-like sentences in a shorter time without being a skilled programmer. As an experimental case study, the proposed language has been applied to the flexible framework for magnetic measurements at the European Organization for Nuclear Research (CERN). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design and Characterization of an MFSK-Based Transmitter/Receiver for Ultrasonic Communication Through Metallic Structures

    Publication Year: 2011 , Page(s): 3767 - 3774
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (895 KB) |  | HTML iconHTML  

    Some applications require wireless transmission of information to and from devices located inside metal enclosures, e.g., a closed shipping container in transit. However, traditional radio frequency (RF) communication schemes are not capable of transmitting signals through metal enclosures. As an alternative to RF, an ultrasonic communication system based on multitone frequency-shift keying (MFSK) has been developed and evaluated using the steel corner posts of shipping containers as the communication medium. Empirical studies have been performed on the steel channel. The communication system is configurable and consists of two or more modules. The modules are mounted to the metal posts and utilize an inexpensive ultrasonic transducer to send and receive modulated signals through the metal channel. A module also makes use of an inexpensive digital-signal-processing chip for modulating and demodulating MFSK signals. Two case studies for the shipping container application were evaluated: 1) communicating through one container and 2) communicating between stacked containers. Regarding the second case study, a key discovery was that each of the aggregate steel columns formed by a stack of shipping containers can serve as an ultrasonic communication channel that spans all containers in the stack. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-Precision Ultrasonic Ranging System Platform Based on Peak-Detected Self-Interference Technique

    Publication Year: 2011 , Page(s): 3775 - 3780
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (695 KB) |  | HTML iconHTML  

    A high-precision ultrasonic ranging system platform is presented and evaluated in this work. By queuing peaks of the self-destructive interference, the proposed hardware platform can enhance the accuracy without complex algorithms. At the emitter, the developed technique generates two amplitude-modulated pulses with 180° phase shift. At the receiver, on the other hand, the two pulses create a self-destructive interference. This interference waveform can be used to directly determine the time of flight. By implementing the developed technique on a low-cost microcontroller platform, the experimental result shows the accuracy with 0.06 mm over a range of 50-1000 mm. Moreover, the system accuracy remains 0.15 mm within the range of 2000 mm. The developed system establishes an effective method for low-cost and high-performance ranging systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Robust Shape-Feature-Vector-Based Face Recognition System

    Publication Year: 2011 , Page(s): 3781 - 3791
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (797 KB) |  | HTML iconHTML  

    This paper presents a feature-based approach for fast face recognition. A novel shape-based automatic reference control point and feature extraction technique is proposed for face representation, whereby the difference between two faces is measured by a set of extracted features, and 3-D features from a set of 2-D images are used for face template registration. Unlike holistic face recognition algorithms, the feature-based algorithm is relatively robust to variations of face expressions, illumination, and pose, due to invariance of its facial feature vector. The theoretical performance analysis of the proposed technique was provided by a probabilistic and statistical approach. The proposed approach is shown to achieve promising performance for face recognition using several subsets of face recognition databases. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Iterative Framework for Frequency Response Mismatch Correction in Time-Interleaved ADCs: Design and Performance Analysis

    Publication Year: 2011 , Page(s): 3792 - 3805
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (515 KB) |  | HTML iconHTML  

    This paper proposes a new iterative framework for the correction of frequency response mismatch in time-interleaved analog-to-digital converters. Based on a general time-varying linear system model for the mismatch, we treat the reconstruction problem as a linear inverse problem and establish a flexible iterative framework for practical implementation. It encumbrances a number of efficient iterative correction algorithms and simplifies their design, implementation, and performance analysis. In particular, an efficient Gauss-Seidel iteration is studied in detail to illustrate how the correction problem can be solved iteratively and how the proposed structure can be efficiently implemented using Farrow-based variable digital filters with few general-purpose multipliers. We also study important issues, such as the sufficient convergence condition and reconstructed signal spectrum, derive new lower bound of signal-to-distortion-and-noise ratio in order to ensure stable operation, and predict the performance of the proposed structure. Furthermore, we propose an extended iterative structure, which is able to cope with systems involving more than one type of mismatches. Finally, the theoretical results and the effectiveness of the proposed approach are validated by means of computer simulations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimum Two-Dimensional Uniform Spatial Sampling for Microwave SAR-Based NDE Imaging Systems

    Publication Year: 2011 , Page(s): 3806 - 3815
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (427 KB) |  | HTML iconHTML  

    Microwave imaging systems for nondestructive evaluation, based on 3-D synthetic aperture radar (SAR) techniques, utilize either a real aperture, composed of many antennas mounted next to one another, or a synthetic aperture, generated by raster scanning a single antenna. To obtain a quality SAR image, the spatial sampling must be dense enough to accurately sample the electric field reflected from a target. Conversely, the quantity of spatial samples may be optimally reduced, resulting in reduced system complexity and required resources for systems employing real apertures and reduced imaging time for synthetic aperture systems. In the literature, it has been reported that the optimum sampling step size is equal to the theoretical resolution, as per the Nyquist rate. It has also been reported that an image generated using a sampling step size equal to the theoretical resolution may not possess the same spatial resolution as predicted. Also, as expected and reported, resolution is dependent upon the distance between the target and the aperture, aperture dimensions, and antenna beamwidth. However, existing formulations of SAR resolution do not account for all of the physical characteristics of a measurement (e.g., 2-D limited-size aperture, electric field decreasing with distance from the measuring antenna, etc.). This paper presents a theoretical formulation of resolution and a study into optimum uniform spatial sampling by analyzing simulated 3-D SAR images according to metrics representing image quality, namely, half-power resolution and RMS error between practically sampled images and an ideally sampled image. The results of this simulation demonstrate optimum sampling given design requirements that fully explain resolution dependence on sampling step size. Also, it is found that there is additional widening of the 2-D spectral estimation of the data due to the aperture-limited nature of the measurements, which further influences the choice of sampling step size. S- - ubsequently, the simulated results are compared to experimental results corroborating the efficacy of the formulation. Finally, design curves and procedures are proposed for selecting sampling step size as per resolution requirements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Open and Flexible Embedded System Applied to Positioning and Telecontrol

    Publication Year: 2011 , Page(s): 3816 - 3823
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (824 KB) |  | HTML iconHTML  

    This paper presents the development and testing of an open and flexible embedded system applied to positioning and telecontrol (OFESAPO) for outdoor applications. The system is composed of a control center (CC) and a set of remote terminal units (RTUs); the International Electrotechnical Commission (IEC) 60870-5 series has been chosen for communication among them. This is a standard protocol of real-time telecontrol applications. The CC is a personal computer, and the RTUs are based on open hardware and software. The RTU hardware is an embedded system, i.e., a system-on-chip-type design using field-programmable gate array that has been programmed with the open-core LEON running Linux operating system. For prototyping, the GR-XC3S-1500 board has been used. As there is no open source code available for the IEC standard protocols, an open source code has also been implemented. Hence, both the hardware and the software are open source in OFESAPO. Several tests have been made to show the system's limitations and the suitability for real-time applications. A prototype has also been tested in a real environment, where the real position of two moving RTUs was shown by a CC using Google Map. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Ultralow-Power Wireless Camera Node: Development and Performance Analysis

    Publication Year: 2011 , Page(s): 3824 - 3832
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (329 KB) |  | HTML iconHTML  

    This paper presents the design principles underlying the video nodes of long-lifetime wireless networks. The hardware and firmware architectures of the system are described in detail, along with the system-power-consumption model. A prototype is introduced to validate the proposed approach. The system mounts a Flash-based field-programmable gate array and a high-dynamic-range complementary metal-oxide-semiconductor custom vision sensor. Accurate power measurements show that the overall consumption is 4.2 mW at 3.3 V in the worst case, thus achieving an improvement of two orders of magnitude with respect to video nodes for similar applications recently proposed in the literature. Powered with a 2200-mAh 3.3-V battery, the system will exhibit a typical lifetime of about three months. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Robust Covariance Estimation for Data Fusion From Multiple Sensors

    Publication Year: 2011 , Page(s): 3833 - 3844
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1109 KB) |  | HTML iconHTML  

    This paper addresses the robust estimation of a covariance matrix to express uncertainty when fusing information from multiple sensors. This is a problem of interest in multiple domains and applications, namely, in robotics. This paper discusses the use of estimators using explicit measurements from the sensors involved versus estimators using only covariance estimates from the sensor models and navigation systems. Covariance intersection and a class of orthogonal Gnanadesikan-Kettenring estimators are compared using the 2-norm of the estimates. A Monte Carlo simulation of a typical mapping experiment leads to conclude that covariance estimation systems with a hybrid of the two estimators may yield the best results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Predicting Foaming Slag Quality in Electric Arc Furnace Using Power Quality Indices and Fuzzy Method

    Publication Year: 2011 , Page(s): 3845 - 3852
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (729 KB) |  | HTML iconHTML  

    In this paper, a new method based on adaptive neuro fuzzy inference system (ANFIS) and fuzzy logic is presented to determine the slag quality in electric arc furnace using power quality indices. To train ANFIS, all electrical power quality parameters are measured for 13 meltings using a power quality analyzer. Twelve different sets of power quality parameters are examined to predict the slag quality. Finally, one parameter set consisting of total current harmonic distortion, seventh current harmonic, and three phase current unbalance is selected, which shows the best prediction accuracy. Although the trained ANFIS can accurately predict the slag quality, it is not a robust predictor. If the power quality analyzer model or furnace capacity is changed, then the predictor accuracy will be decreased. To overcome this problem, the fuzzy method is used to predict the slag quality using selected power quality parameters. The predictor reports the slag quality every 1 min in experimental test. The designed fuzzy slag quality predictor can also be used in an automatic slag control process. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of a Sensor Coil and Measurement Electronics for Magnetic Induction Tomography

    Publication Year: 2011 , Page(s): 3853 - 3859
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (911 KB) |  | HTML iconHTML  

    Magnetic induction tomography (MIT) is a tomographic imaging technique that is able to map the electromagnetic properties within an object or vessel from magnetic field measurements. Excitation coils are used to induce eddy currents in the medium, and the magnetic field produced by the induced eddy current is then sensed by receiver coils. Because of its noncontact nature, MIT is particularly attractive for biomedical and some industrial applications, such as pipe-flow monitoring, when compared with traditional contact electrode-based electrical impedance tomography. This paper describes the design and performance of an MIT transceiver circuit that can operate from 400 kHz to 12 MHz. The in-phase and quadrature (I/Q) demodulation technique is used to measure the signal perturbation due to the induced conduction eddy currents. The transceiver circuit design employs a single integrated circuit, containing a variable-gain amplifier and an I/Q demodulator. This paper contains characterizations of the transceiver's measurement noise, system stability, and sensitivity for detecting saline solutions and metal plates. A novel balanced coaxial screened coil structure with integrated current sensing was also developed to minimize capacitive coupling between coils and to allow measurement of the current in the driving coils. Experiments were carried out at 3 and 10 MHz using bottles of saline solutions (1%-5% concentration) and metal sheets (aluminum and steel) to verify the sensitivity for conductivity imaging. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Simultaneous Reactive-Power and Frequency Estimations Using Simple Recursive WLS Algorithm and Adaptive Filtering

    Publication Year: 2011 , Page(s): 3860 - 3867
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (641 KB) |  | HTML iconHTML  

    A new simple approach to the design of digital algorithm for simultaneous reactive-power and frequency estimations of local system is presented. The algorithm is derived using the weighted-least-square method. During the algorithm derivation, a pure sinusoidal voltage model was assumed. Cascade finite-impulse-response (FIR) comb digital filters are used to minimize the noise effect and to eliminate the presence of harmonics effect. The most important point of this paper is the mathematical model that transforms the problem of estimation into an overdetermined set of linear equations. The investigation was simplified because the total similarity to the state of the problem of the active-power and frequency estimations was noticed. The only difference is the adaptive phase shifter applied to the voltage signal. In addition, coefficient-sensitivity problems of the large-order FIR comb cascade structure are overridden by using a multirate (decimation) digital signal processing technique. Even more, by using antialiasing filters, the parameter estimation accuracy is improved. The effectiveness of the proposed techniques is demonstrated by both simulation and experimental results. The algorithm shows a very high level of robustness, as well as high measurement accuracy over a wide range of frequency changes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accurate Torque Ripple Measurement for PMSM

    Publication Year: 2011 , Page(s): 3868 - 3874
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (379 KB) |  | HTML iconHTML  

    Torque ripple in permanent-magnet synchronous motors is generally undesirable. Significant work has been done to minimize this torque, either by modifying the mechanical motor design or by careful controller design. Surprisingly, however, little work has been published on the accuracy of torque ripple measurement. A successful measurement requires a mechanical design with readily modeled dynamics, sensors with suitable bandwidth and resolution, a method of applying a smooth load to the motor, and a method for calibrating the measurement. This paper presents a thorough approach to the accurate measurement of torque ripple. The proposed system has been validated by finite-element modeling, analytical calculations, and experimental analysis. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Noise and Aliasing Aspects in a Multiharmonic-Dielectric-Response-Measurement System

    Publication Year: 2011 , Page(s): 3875 - 3882
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB) |  | HTML iconHTML  

    Dielectric-response measurements are commonly performed with frequency-domain spectroscopy, polarization/depolarization-current measurements, or return-voltage measurements. These techniques operate in a frequency or time domain, and all have high requirements on the voltage source in order to acquire accurate results. This limits dielectric-response measurements to offline applications. A new technique, which is called arbitrary-waveform-impedance spectroscopy, has been developed, which makes use of the harmonics of any voltage waveform to perform dielectric-response measurements. The technique provides possibilities for online measurements facilitating the monitoring of materials and components in high-voltage applications. Here, the different aspects of the measurement system are presented, including circuit modeling, normalization, and discussions on aliasing and noise; all of them are necessary to control in order to perform accurate measurements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic Maps for Indoor Navigation

    Publication Year: 2011 , Page(s): 3883 - 3891
    Cited by:  Papers (12)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1115 KB) |  | HTML iconHTML  

    Magnetic field fluctuations and anomalies inside buildings tend to have a great effect on the compass, which is one of the simplest navigation devices. Alternative navigation requires landmark identification, so those landmarks can be used as guideposts in assisting individuals. By employing a mobile phone with built_in magnetometer, an extensive data set of 2000 measurements was collected. Using these fields, we identify landmarks and guideposts and create magnetic maps for multiple corridors of a floor in a building. Different phones are used at different sensitivity rates, which effectively portray similar results. Magnetic signatures are used for identifying locations and rooms and are independent of the person, the phone, and the sensitivity of the sensor being used. Magnetic field behavior is demonstrated and compared with theoretical distributions of these fields. The developed magnetic maps can complement existing visual maps for location tracking and navigation of autonomous robots indoors. These maps are particularly useful during limited visual feedback in poor lighting conditions. Moreover, building designers could include this landmark and guidepost information when developing the architecture of a building, which could in turn help people or robots navigate during disasters and emergency evacuations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A New Resonance-Based Method for the Measurement of Nonmagnetic-Conducting-Sheet Thickness

    Publication Year: 2011 , Page(s): 3892 - 3897
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (904 KB) |  | HTML iconHTML  

    A measurement system to measure the thickness of a nonmagnetic conducting sheet is designed, simulated, developed, and tested. The measurement system is designed as a resonant system with a cantilever being a resonating structure with piezoelectric excitation and detection. The permanent magnets at the tip of the cantilever beams produces an oscillating magnetic field, and the insertion of the conducting sheet in the magnetic field produces eddy current on it. The magnetic field produced due to eddy current alters the magnetic field produced by the permanent magnet. This alters the natural frequency of the measurement system as the stiffness due to the magnetic force varies with thickness. The simulation and experimental results show that the resonant frequency of the measurement system varies linearly with thickness and sensitivity is found to be higher for the material having higher conductivity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inverse Models of Voltage and Current Probes

    Publication Year: 2011 , Page(s): 3898 - 3906
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1225 KB) |  | HTML iconHTML  

    Power switching loss estimation for fast power semiconductor devices requires probe inverse models. Simple corrections of the delay introduced by the probe cables improve the measured waveform, but they are not sufficient. Prior to the construction of the probe inverse models, the authors introduce direct models. Particularly, the classical RLC equivalent circuit reveals a poor model. The “traveling wave,” i.e., Bergeron's approaches, is introduced, which leads to convenient probe inverse models. The validation is obtained between experimental results and simulation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design Considerations for a CCC Bridge With Complete Digital Control

    Publication Year: 2011 , Page(s): 3907 - 3912
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB) |  | HTML iconHTML  

    The design considerations for a completely digitally controlled cryogenic current comparator resistance ratio bridge, including the feedback loops for voltage and current balance, are described. The numerical algorithms have been modeled and optimized, and the overall system performance is illustrated with example measurement data. It is shown that the final performance of the bridge is limited only by the accuracy of the current comparator, the noise sources associated with the current and voltage null detectors, and the resistors under test. An explanation of how the effect of leakage resistance in the system is minimized is also given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave Time-Domain Reflection Imaging of Steel Fiber Distribution on Reinforced Concrete

    Publication Year: 2011 , Page(s): 3913 - 3922
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1230 KB) |  | HTML iconHTML  

    This paper presents a time-domain reflection electromagnetic analysis for nondestructive testing of the fiber dosage inside steel-fiber-reinforced concrete (SFRC). With the fibers treated as electrical dipoles, the Maxwell-Garnett mixing rule for dielectric mixtures is used to obtain an estimation of the density of fibers in the composite material from the time-domain measurement of the effective permittivity of the sample. First, a numerical electromagnetic modeling of the fiber polarizability is performed using a Method-of-Moments-based code and a simple frequency-dependent polarizability is obtained. Second, a robust and novel relationship between the mean propagation delay and the total stored energy with the effective permittivity of the medium is obtained. A wideband measurement system based on a time-domain setup in a reflection arrangement is used for the analysis of SFRC test structures. The fiber dosage in the SFRC structures is reconstructed, showing good agreement with the expected dosage figures. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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