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Page 843 of 907 Results 8421 - 8430 of 9067

Nico Deblauwe, Valentin Enescu, Leo Van Biesen
AN OPEN SOURCE BASED TELECOM MEASUREMENT SETUP BASED ON COMMERCIALLY AVAILABLE MOBILE PHONES

This paper presents a mobile measurement setup, VUBmeas, which is based on open source software and commercially available mobile phones. The system design, both from a hardware and software point of view and the possibilities will be looked at. Two examples of applications are given to show its broad usability: one more in the field of positioning, the original field of research it was developed for.

Jerzy Nabielec, Jacek Nalepa
A SIMULATION INVESTIGATION OF DIFFERENTIAL ALGORITHM FOR THE “BLIND CORRECTION” OF DYNAMIC ERROR IN MEASURING CHANNELS WITH PERIODIC NONSTATIONARITY

The paper presents the application of a differential algorithm for the “blind correction” method with respect to measuring systems where both: the measured signal and parameters of the measuring channels are varying with the same fundamental frequency. The influence of the measuring channels’ parameters on the effectiveness of correction was investigated for the polyharmonic case, using the simulation methods.

Stanislaw Moskowicz
FLUXGATE SENSOR WITH A SPECIAL RING-CORE

In the proposed design of a ring-core sensor, three windings, namely the exciting, the sensing and the compensating ones are applied directly on a special ringcore. The core is also wrapped with an additional winding that controls the so-called virtual air-gap. The virtual air-gap enables the sensor sensitivity to be adjusted in wide range. In the paper the design and test results of the proposed sensor are presented.

V. Pop, P.P.L. Regtien, H.J. Bergveld, P.H.L. Notten, J.H.G. Op het Veld
UNCERTAINTY ANALYSIS IN A REAL-TIME STATE-OF-CHARGE EVALUATION SYSTEM FOR LITHIUM-ION BATTERIES

Lithium-ion (Li-ion) is the most commonly used battery chemistry in portable applications nowadays. Accurate State-of-Charge (SoC) and remaining run-time (tr) calculation for portable devices is important for the user convenience and to prolong the lifetime of batteries. A new SoC algorithm for Li-ion batteries that combines adaptivity with direct measurement and book-keeping systems has been developed and implemented in a real-time evaluation system.
In this paper the error sources in the real-time SoC evaluation system with possible calibration solutions are described. The goal of the SoC system is to predict the remaining run-time of a Li-ion battery with an uncertainty of 1 minute or better under all realistic user conditions, including a wide variety of load currents and a wide temperature range.

Branislav Skladan, Peter Fuchs
SYSTEM FOR AUTOMATED CALIBRATION OF DIGITAL ELECTRICITY METERS

The developed calibration software for the automated calibration process of digital sampling electricity meters is described. In present, two types of electricity meters, PEM 6711 (Precise Electricity Meter) and single phase electricity meter based on mixed-signal processor TI MSP430FE427 can undergo a fully automated calibration process. Calibration laboratory with the electronic calibration station EKS 05-3, used to calibrate electricity meters, is also described and its function is explained.

R. Micheletti, R. Pieri
RATIONAL BUILDING ENERGY CONSUMPTION BY ADVANCED CONTROL TECHNOLOGIES BASED ON INSTANTANEOUS AVERAGE ACTIVE POWER MEASUREMENT

Fast and accurate measurement of the instantaneous average active power (IAAP) is useful for building Energy Management System (EMS) in order to assure quality of service such as continuity, optimize energy consumption and reduce carbon dioxide emission. In this paper the problems connected to the measurement of the instantaneous average active power for energy usage improving are discussed, also as the operational processes which deal to solve such problems.

Cesar Alberto Penz, Carlos Alberto Flesch
INFLUENCE OF STANDARD CAPACITORS ON THE QUALITY OF HIGH VOLTAGE TESTS ON ELECTRICAL ENERGY TRANSMISSION EQUIPMENTS

This article proposes and implements actions for guarantee of metrological reliability and safe conformity assessment of tested equipments when using standard capacitors. It is presented: a review on standard capacitor typical behavior and the description of an experiment for reduction the contribution on uncertainty.

Daniele Gallo, Annalisa Liccardo, Nicola Pasquino
PERFORMANCE ANALYSIS OF AN ACTIVE ENERGY INDUCTION METER USING AN INNOVATIVE APPROACH

The paper is focused on the performance analysis of an induction energy meter under different voltage and current waveforms, both sinusoidal and deformed, which resemble possible conditions of supply network encountered during normal operation. The measurement test bench and the experimental plan are presented. Experimental results are compared to a reference watthour meter, and the relative error is characterized in terms of dependence on input quantities.

Wieslaw Barwicz, Andrzej Podgórski, Serghei Duminov, Roman Z. Morawski
NEW PRINCIPLE OF ACOUSTIC CALIBRATORS DESIGN

A new principle of acoustic calibrators design, based on the use of a microprocessor in the control loop of the calibrator, is presented. The mechanical and functional features of the calibrator using this principle are briefly described, and its technical specification is given. The applied algorithms of digital regulation loop and the coherent sampling of the reference signal are described in details. The carried-out experiments are presented as well as the results of the tests. The strong and the weak points of the selected solution in the relation to the traditional analogue techniques are pointed out. The conclusions concerning the practical usefulness of the developed calibrator are drawn.

Pasquale Arpaia, Fabrizio Clemente, Carmine Romanucci, Antonio Zanesco
EXPERIMENTAL CHARACTERIZATION OF AN EIS-BASED METHOD FOR LOWINVASIVE DIAGNOSIS OF PROSTHESIS OSSEOINTEGRATION

A digital measurement method for lowinvasive clinical diagnosis of metallic prosthesis osseointegration was proposed. Electrical impedance spectroscopy is exploited to characterize the quality of the interface bone-prosthesis tissue. In this paper, in vitro and in vivo experimental results of the application of the proposed method to the evaluation of osseointegration of metallic implants used for percutaneous fixation are shown with a specific clinical case study in audiology. In particular, a cochlear implant BAHA ® from Cochlear TM with direct bone conduction was used. In vivo measurements were performed on children with fixtures implanted respectively 7, 9, and 18 months before the test.

Page 843 of 907 Results 8421 - 8430 of 9067