Temat: electrical impedance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: New electrical tomographic method to determine dampness in historical buildings
Autorzy:: Rymarczyk, T.
Adamkiewicz, P.
Duda, K.
Szumowski, J.
Sikora, J.
Powiązania:: https://bibliotekanauki.pl/articles/141049.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrical impedance tomography
inverse problem
finite element method
level set method
Opis:: This paper presents a new, nondestructive method of testing brick wall dampness in wall structures. The setup was used to determine the moisture in a specially built laboratory model. Topological methods and the gradient technique are used to optimize the approach. A forward model of a wall was constructed to solve the inverse problem resulting in moisture buildup inside the wall.
Źródło:: Archives of Electrical Engineering; 2016, 65, 2; 273-283
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Fractional-order model of a non-linear inductor
Autorzy:: Lopes, A. M.
Tenreiro-Machado, J. A.
Powiązania:: https://bibliotekanauki.pl/articles/200387.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fractional-order model
inductor
electrical impedance spectroscopy
model ułamkowy
induktor
spektroskopia
impedancja elektryczna
Opis:: This paper adopts a fractional calculus perspective to describe a non-linear electrical inductor. First, the electrical impedance spectroscopy technique is used for measuring the impedance of the device. Second, the experimental data is approximated by means of fractional-order models. The results demonstrate that the proposed approach represents the inductor using a limited number of parameters, while highlighting its most relevant characteristics.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 61-67
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of ADC Resolution on Low-Frequency Electrical Time-Domain Impedance Spectroscopy
Autorzy:: Namin, R. L.
Ashtiani, S. J.
Powiązania:: https://bibliotekanauki.pl/articles/221144.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrical impedance spectroscopy
analogue-to-digital converter
Ramp signal
fast Fourier transform
Nyquist plot
Opis:: In this paper, the effect of the resolution of an analogue-to-digital converter (ADC) on the accuracy of timedomain low-frequency electrical impedance spectroscopy is examined. For the first time, we demonstrated that different wideband stimuli signals used for impedance spectroscopy have different sensitivities to the resolution of ADC used in impedance spectroscopy systems. We also proposed Ramp and Half-Gaussian signals as new wideband stimulating signals for EIS. The effect of ADC resolution was studied for Sinc, Gaussian, Half-Gaussian, and Ramp excitation signals using both simulation and experiments. We found that Ramp and Half-Gaussian signals have the best performance, especially at low frequencies. Based on the results, a wideband electrical impedance spectroscopy circuit was implemented with a high accuracy at frequencies bellow 10 Hz.
Źródło:: Metrology and Measurement Systems; 2017, 24, 2; 425-436
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Method of earth fault loop impedance measurement without nuisance tripping of RCDs in 3-phase low-voltage circuits
Autorzy:: Czapp, Stanisław
Powiązania:: https://bibliotekanauki.pl/articles/220837.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: power systems
electrical safety
fault current
fault protection
impedance measurement
Opis:: Verification of electrical safety in low-voltage power systems includes the measurement of earth fault loop impedance. This measurement is performed to verify the effectiveness of protection against indirect contact. The widespread classic methods and meters use a relatively high value of the measuring current (5-20) A, so that they are a source of nuisance tripping of residual current devices (RCDs). The meters dedicated to circuits with RCDs usually use an extremely low value of current (lower than 15 mA), which in many cases it is not acceptable in terms of the measurement accuracy. This paper presents a method of earth fault loop impedance measurement in 3-phase circuits, without nuisance tripping of RCDs – the concept of measurement, the meter structure and the experimental validation. The nuisance tripping is avoided in spite of the use of measuring current value many times higher than that of the rated residual current of RCDs. The main advantage of the proposed method is the possibility of creating values of measuring current in a very wide range, what is very important with regard to accuracy of the measurement.
Źródło:: Metrology and Measurement Systems; 2019, 26, 2; 217-227
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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