Domenico Giordano, Luca Zilberti, Michele Borsero, Roberto Forastiere, Wencui Wang
One of the scientific challenges in the electromagnetic compatibility (EMC) and electromagnetic field exposure area is the validation, by means of suitable experiments, of the numerical procedure aimed at the estimation of the electromagnetic quantities generated in a test volume or induced in a human body. This paper describes the arrangement of a first experimental set-up which will allow to compare the measurement of the electromagnetic field quantities induced inside a simple cylindrical phantom with the same quantities estimated numerically.
TC4 Symposium 2013
· TC4
· 2013
· Download
Leopoldo Angrisani, Domenico Capriglione, Luigi Ferrigno, Gianfranco Miele
To meet the demanding expectations of the users, nowadays radio systems have to use the spectrum resource more intensely than in the past. Several studies have demonstrated that portions of radio spectrum are not in use for significant periods of time. Cognitive radios systems have been conceived to overcome this limit, enabling a flexible spectrum allocation, and making a more intensive and efficient spectrum use by the users sharing spectrum access. To meet this goal, cognitive radio terminals have to dynamically select the appropriate operating frequency based on the sensing of signals...
TC4 Symposium 2013
· TC4
· 2013
· Download
Umberto Pogliano, Bruno Trinchera, Danilo Serazio
This paper describes the development, at INRIM, Italy, of a system for the accurate measurement of the power with distorted signals. This system consists of a six input high resolution acquisition system and suitable shunts and voltage dividers. The first version of the system has been tested for its functionality and in comparison with the primary system for the measurement of electrical power showing a good agreement, when the same devices are used as signal conditioners. Instead, not negligible differences arise in the direct comparison of the two systems, mainly due to the instability of...
TC4 Symposium 2013
· TC4
· 2013
· Download
Diego Sanz, Mariano Ruiz, Juan Manuel López, Rodrigo Castro, Jesús Vega, Eduardo Barrera
Instrumentation in scientific experiments requires highest accurate to correlate acquired data with a time reference. In order to implement data acquisition channels synchronized to a reference clock, it is necessary to deploy a distributed clock based on computer devices with specific hardware for data acquisition, and to use a technology capable of synchronizing every computer in the system. Although there are several technologies to synchronize devices as the Precision Time Protocol (PTP) IEEE1588 V2, not always is trivial to use it to get a good performance. This work studies how can be...
TC4 Symposium 2013
· TC4
· 2013
· Download
Balázs Renczes, István Kollár
In this paper a novel approach to A/D conversion is introduced. After significant oversampling data points can be selected of which we precisely know the value – these are the samples at transition level crosses. The levels are determined beforehand using histogram testing. To have sufficient number of transition level crosses, dither can be added. Finally, to obtain uniformly sampled data, interpolation is performed. Using this method, the error of AD conversion can be significantly reduced still using the same low-bit converter.
TC4 Symposium 2013
· TC4
· 2013
· Download
Miguel Neira
This paper presents a view about the role of the CEM national measurement standards in the framework of the Mutual Recognition Arrangement, MRA, of the International Committee for Weights and Measures, CIPM, and simultaneously as they used as a base in their participation in European Metrology Research Program, EMRP, projects. During last years the strategy of EURAMET and of its members National Metrology Institutes, NMIs, has been directing their efforts toward a joint participation in the EMRP. Centro Español de Metrología, CEM, is the organization responsible for the metrological...
TC4 Symposium 2013
· TC4
· 2013
· Download
Krzysztof Konopka
The most commonly used thermometer to measure high temperatures in metallurgy is the thermocouple, but because of its long response time it can be used mainly for measuring time-averaged temperatures. Research on steel wire patenting using inductive heating required instantaneous temperature values. Pyrometers or thermographic cameras could be used, however they are generally expensive, and temperature measurements are not always reliable due to differing emissivities. In described case expensive infrared thermometers could be replaced by cheap thermocouple provided that dynamic errors were...
TC4 Symposium 2013
· TC4
· 2013
· Download
Alexandru Salceanu, Fanel Iacobescu, Mirela-Adelaida Olteanu (Anghel)
The first part of the paper is focussed on own direct measurements of human body resistancecapacitance, in indissoluble connection with two resistances: the leakage and respective, the discharge ones. There are presented methods, set-ups and argued explanations for the large dispersion of the obtained results. The human impedance (capacitance shunted by leakage resistance) was measured by performing the ratio between the well known ac voltage (as r.m.s. and frequency) and the established current. In order to determine the skin resistance between different parts of the human body (wrist,...
TC4 Symposium 2013
· TC4
· 2013
· Download
Anton Zarevich, Sergey Muravyov, Elena Bedareva
In the paper a digital signal processing method for measuring frequency response function of highcurrent shunt are described. This is based on a joint digital processing of the input short pulse signal and a corresponding output. In order to measure the frequency response function, a short current pulse is applied to the shunt input; input and output signals of the shunt are recorded in a digital oscilloscope memory; then spectra of these two signals are computed. Amplitude and phase responses are determined by the arithmetic ratio of spectral components of the input and output signals at...
TC4 Symposium 2013
· TC4
· 2013
· Download
Thiago Batista, Benedito Luciano, Raimundo Freire
Based on the electromagnetic properties of nanocrystalline alloys, such as high relative magnetic permeability, low coercive force and low hysteresis losses, in this paper are presented some considerations about the application of these materials in toroidal cores used as current transformers. Also, are discussed how the ferromagnetic core characteristics affect the current transformer performance. From the experimental results, it can be concluded that the use of nanocrystalline alloys in the current transformer cores can contribute to the reduction of phase errors, improving thus the...
TC4 Symposium 2013
· TC4
· 2013
· Download