Cristian Fosalau, Catalin Damian, Cristian Zet
The paper presents an electrical model developed for Pspice simulation of the behavior of the magnetic amorphous wires working under the Giant Magnetoimpedance (GMI) effect. The model was developed in order to facilitate the design of the signal conditioning circuitry belonging to the new category of transducers whose sensitive elements are based on the GMI effect. Its complexity arises from the fact that the effect is influenced by many internal or external factors whose actions have to be taken into consideration in the designing phase. In order to assess its performances, the model was...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Anna Marconato, Andrea Boni, Dario Petri, Johan Schoukens
In this work we discuss the application of Support Vector Machines to the problem of identifying a specific class of nonlinear systems, namely Wiener- Hammerstein systems. Only based on a set of Input/Output measurements, a model is built that approximates well the behavior of the considered system. However, care should be taken when designing suitable excitations, as the performance of the proposed approach turns out to be quite sensitive to the nature of the input signal. This sensitivity is studied here by using several datasets, characterised by different excitation signals, in terms of...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Octavian Postolache, Monica Ferreira, Gabriela Postolache, Pedro Silva Girão
Obesity-hypertension is an emerging concept in pathophysiology. Obesity and hypertension have been turned into an epidemic afflicting all the word, being among the mainly factors that have been burning the health costs. This paper reports a study whose purpose was to develop an objective method to better diagnose and manage this pathophysiology. A data management and data mapping system was developed. Kohonen topological mapping was used in the classification of obesity-hypertension considering clinical characteristics and laboratory results. Thus, the n-dimensional space of...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
O. Postolache, J. Apolonia, N. Beirante, P. Macedo, M. D. Pereira, P. Girão
The purpose of the paper is to report mainly the work developed in the areas of geographic information systems and distributed instrumentation for dolphins’ environment assessment. Different solutions for water quality sensing and data communication are considered including independent monitoring nodes and mobile measuring stations associated with ships. The received data from water quality sensors, hydrophones and GPS is wireless transmitted to a host PC where the geographic information system (GIS), data management, and data publishing are implemented. Thus, on-line environment assessment...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
G. Hornero, O. Casas and R. Pallàs-Areny
AC excitation followed by synchronous demodulation is an effective noise-reduction method for signal conditioning in modulating sensors. However, it cannot be applied to self-generating sensors such as thermocouples or piezoelectric films. Switching on and off the power supply voltage of an amplifier yields a modulated output signal and allows for synchronous demodulation. Hence, this method improves the signal-to-noise ratio (SNR) by reducing 1/f noise and reduces power consumption. Furthermore, it can be applied to self-generating sensors. A prototype system based on this method has been...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Hlavacek, J., Prochazka, R., Draxler, K., Kvasnicka, V.
The aim of presented work was the realization of program for the Rogowski Coil design with respect to the amplitude and shape of the measured current and parameters of circuits for output voltage evaluation. There was taken into consideration closed nonferromagnetic toroidal Rogowski Coil wound as one-layer homogenous winding. The program for Rogowski Coil design is able to calculate coil dimensions to obtain required value of mutual inductance between conductor with measured current and the sensing winding. The goal is to reach defined amplitude and time course of induced output voltage...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Ph. D. candidate Cirdei Cornel Dinu
The Application for Protection, Control and Meterring Circuits using a Development Microsystem, simulates protection, alarms, control and metering instruments, for 20 kV Over Head Line Feeder. The first function of present application makes a combination between coordinated and integrated systems, combining the safety of first with the fast operating of second and simulates protection operations, for the feeder described above. The second function of this application, is to command and supervise local and remote operations of Bus Bar Switches, Circuit Breaker and Earthing Switch, assuring...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
M. Chiampi, G. Crotti, Y. Hu, A. Sardi
The calibration of a partial discharge measuring system is carried out to determine its scale factor. This operation is performed in the complete test circuit by injecting across the terminals of the device under test a known charge generated by a traceable calibrator. The paper presents the calibration of four different partial discharge measuring systems, carried out by using a programmable reference impulse charge generator developed at the Istituto Nazionale di Ricerca Metrologica. The device is composed of an arbitrary waveform generator and a series capacitor. By this instrument, the...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Vincenzo Cutrupi, Carmine Landi, Mario Luiso
Voltage and current transformers are the most installed transducers in electrical power system and typically they are constructed to operate at industrial frequency, 50/60 Hz. On the other hand power quality analyses in the last years has assumed more and more heaviness in industrial environments, due to the presence of non-linear loads: they require measuring instrumentation with large bandwidth. Therefore in this paper a real-time digital technique for the compensation of current transformers, based on field programmable gate array, is presented: it implements a digital filter with a...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Pasquale Arpaia, Mario Luca Bernardi, Giuseppe Di Lucca, Vitaliano Inglese, Giovanni Spiezia
An Aspect-Oriented approach to software synchronization in automatic measurement systems is proposed. Tasks are synchronized by means of “aspects”, a specific software unit to better modularize properties and features transversal to many modules (“crosscutting concerns”). In this way, maintainability and reusability of a measurement software are improved: once a modification in the synchronization policy occurs, only the related aspects have to be modified. As an experimental case study, this technique is applied to the software synchronization of a measurement station for testing...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download