Euler C. T. Macedo, José G. A. Lira, Edson G. Costa, Raimundo C. S. Freire, Benedito A. Luciano, Marcelo J. A. Maia
In this paper are described the design and application of an inductive magnetic sensor based on nanocrystalline alloys. The sensor is adjusted for measurement and monitoration of currents with intensities from some microamperes to miliamperes. Its functional behaviour, performance and a specific application are described. One of the biggest advantages of this current sensor is its non-invasive characteristic, it means, is not required any direct contact with the circuit that is being monitored. It becomes appropriated for diverse applications where this requirement is necessary. An example...
XIX IMEKO World Congress
· TC4
· 2009
· Download
Giovanni Betta, Domenico Capriglione, Gianfranco Miele, Luca Rossi
Worldwide Interoperability for Microwave Access (WiMAX), based on the IEEE 802.16 standards, is a technology that offers mobile broadband access to multimedia and internet applications at low cost for operators and end-users. Similarly to cellular phone or other Radio Frequency devices, WiMAX has to be considered as a possible source of electromagnetic pollution and so, monitoring its emission, could be necessary to verify the compliance with the applicable limits. Generally, the monitoring of the electromagnetic pollution is performed by means of a suitable measurement chain constituted by...
XIX IMEKO World Congress
· TC4
· 2009
· Download
Ireneusz Jablonski, Adam G. Polak, Janusz Mroczka
The paper presents the issue connected with the construction and simulations of the complex mathematical model of the respiratory system for the interrupter technique. Combining morphometric data for the consecutive segments of the object (assumption on symmetrical structure of the bronchial tree) with information on existence and proportions between the processes, proper for the interrupter experiment, resulted in an exact imitation of the occlusion conditions, both in the time and frequency domain. It is expected that the model will be a base for design of the simple and reliable...
XIX IMEKO World Congress
· TC13
· 2009
· Download
Raghu N. Kacker, Rüdiger Kessel, Klaus-Dieter Sommer, Xin Bian
The conventional concept of consistency in multiple evaluations of the same measurand is based on statistical error analysis. This concept is based on regarding the evaluations as realizations from sampling probability distributions of potential evaluations which might be obtained in contemplated replications. The expected values of the sampling distributions are regarded as unknown but the standard deviations are assumed to be known. The multiple evaluations are said to be statistically consistent if their dispersion agrees with the hypothesis that the sampling distributions of potential...
XIX IMEKO World Congress
· TC21
· 2009
· Download
Jan Chajda, Bartosz Gapinski, Krzysztof Matlinski, Roman Staniek, Michal Wieczorowski
Coordinate measuring machines in various branches of industry within last years became very common. Measuring machines can be used e.g. for direct determination of correction values for machine tools in production cycle. In the paper a description of closed loop of machine tool and coordinate measuring machine was given. Thus CMM generates a correction file with data including crankshaft geometry. Position of crankshaft during measurements was analyzed and holder for crankshaft was designed and made. Probe pins configuration was prepared and measuring program was elaborated. As a result even...
XIX IMEKO World Congress
· TC14
· 2009
· Download
M. A. Moreira, Amauri Oliveira, C. R. T. Dórea, P. R. Barros, José Sérgio da Rocha Neto
This paper proposes the use of feedback linearization for the characterization of thermoresistive sensors and for the control of measurement systems based on thermoresistive sensors kept at constant temperature. Two important benefits brought by feedback linearization are: regarding sensor characterization, it allows the determination of static and dynamic parameters by a single experimental test; concerning temperature control of the measurement system, it makes the controller design simpler and prevents linear controllers from losing performance due to changes in the operation point. A...
XIX IMEKO World Congress
· TC12
· 2009
· Download
Victor F. M. B. Melo, Adaildo G D'Assunção Jr, Alfredo Gomes Neto, Raimundo C. S. Freire, Glauco Fontgalland
In this work it is proposed new configurations for the ring resonator to determine with accuracy the dielectric permittivity of printed circuit boards operating at high frequencies. The procedure is determining the resonance frequency of the ring and its relation with the permittivity of the material. The results obtained are compared to the ones known for the classic configuration of the ring.
XIX IMEKO World Congress
· TC4
· 2009
· Download
Krzysztof Konopka, Tadeusz Topór-Kaminski
Nowadays measurement data coming from all kinds of measurement systems is usually processed by algorithms. These algorithms are often delivered to the user as complex program and their numerical structure is not known. Therefore also influence of algorithm on an accuracy of processed data is not known. Coefficient matrix of algorithm represents its numerical operations and it can be a basis to algorithm accuracy evaluation. The paper presents a method how to identify this coefficient matrix. As an example this method is used to identify an FFT algorithm implemented in LabVIEW.
XIX IMEKO World Congress
· TC21
· 2009
· Download
Thomas Bruns, Frank Blume, Angelika Täubner
The calibration of Laser vibrometer is an increasing demand in industry and research. The equipment suggested for use in particular for high frequency calibration, however, is typically of prototype stage and not commercially available. This is due to the demand of the employed homodyne quadrature method for a certain minimum displacement, typically a quarter of a wavelength, of the vibrating object. The authors demonstrate that this is not necessarily a compulsory condition. With conventional, commercially available components it is possible to set-up a system for Laser vibrometer...
XIX IMEKO World Congress
· TC22
· 2009
· Download
L. A. Di Salvio, A. F. Orlando
The measurement of the differential pressure is widely employed in the petrol industry for determining the flow rate, level, blockage of filters and the oil-water interface. The calibration of the differential pressure transmitters is usually made at atmospheric pressure, since there is little concern about the static pressure influence on the transducer performance. As a main contribution, this paper presents a calibration methodology of differential pressure transmitters. The ranges of the studied static pressure (from 0 to 20000 kPa) and differential pressure (from 40 to 250 kPa) cover...
XIX IMEKO World Congress
· TC16
· 2009
· Download