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1
Content available Various applications of complex thermal impedance for transient and AC heat transfer analysis
100%
Więcek B. , De Mey G. , Strąkowska M. , Chatziathanasiou V. , Gmyrek Z. , Strzelecki M. , Chatzipanagiotou P.
Measurement Automation Monitoring
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2015
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tom Vol. 61, No. 6
210--214
EN
This paper presents the concept and three practical examples of using complex thermal impedance for characterisation different thermal objects. The first problem describes estimation time shift between power and temperature in electric distribution systems with non-sinusoidal currents. The second example discussed here, shows the estimation of power losses distribution in the magnetic punched ferromagnetic strips. The third application presents the inverse thermal modelling of 3-layer biomedical objects (tissues) to estimate the thermal parameters. More details of the presented problems are in the appropriate papers of the authors referenced here.
2
Content available Effect of ADC Resolution on Low-Frequency Electrical Time-Domain Impedance Spectroscopy
100%
Namin R. L. , Ashtiani S. J.
Metrology and Measurement Systems
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2017
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tom Vol. 24, nr 2
425--436
EN
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.
3
Content available A new software tool for transient thermal analysis based on fast IR camera temperature measurement
100%
Chatzipanagiotou P. , Strąkowska M. , De Mey G. , Chatziathanasiou V. , Więcek B. , Kopeć M.
Measurement Automation Monitoring
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2017
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tom Vol. 63, No. 2
48--51
EN
A new software tool for transient thermal analysis based on thermographic measurement of temperature is presented. In the proposed approach, temperature change after applying or removing power can be measured by a thermal camera or any contact temperature sensor. The software calculates thermal impedance in frequency domain and represents it in the form of the Nyquist plot. In addition, thermal time constant spectrum and cumulative structure function are evaluated. The software was developed in Matlab environment using in-built procedures for transfer function estimation. For the validation of the proposed tool, the results are compared with ones obtained using commercially available software.
4
Frequency Domain Characteristics of Selected Fractional-Order Systems
86%
Gałek M.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2013
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tom z. 69
21--22
EN
This paper presents frequency domain characteristics of selected fractional-order dynamic systems. There is considered first-order system with various values of a fractional order. A frequency response analysis covers the Bode and Nyquist plots.
5
Content available Effect of ADC Resolution on Low-Frequency Electrical Time-Domain Impedance Spectroscopy
86%
Namin R. L. , Ashtiani S. J.
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6
Content available remote Wpływ atmosfery gazowej na przewodnictwo elektryczne spieków z tlenku cyrkonu stabilizowanego itrem (3YSZ)
72%
Stępień E. , Wyrwa J.
Analit
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2016
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tom Nr 2
38--48
PL
W niniejszej pracy zastosowano technikę spektroskopii impedancyjnej do określenia wpływu atmosfery gazowej na przewodnictwo spieków z tlenku cyrkonu stabilizowanego itrem (3YSZ). Pierwszym etapem badań było przygotowanie proszku tlenku cyrkonu stabilizowanego itrem przy wykorzystaniu metody żelatynowej. W ten sposób uzyskano materiał o białej barwie i zawartości 97% mol. tlenku cyrkonu oraz 3% mol. tlenku itru. Przy użyciu spektrometru częstotliwościowego wykonano znaczną ilość pomiarów w zakresie temperatur 300-700°C w trzech wybranych atmosferach: powietrza, mieszaninie gazów (10% wodoru , 90% argonu oraz powietrza po wodorze). Wyniki zestawiono w postaci wykresów Niquist’a oraz wykresów energii aktywacji dla próbki z elektrodą srebrną oraz platynową.
EN
In this study, the technique of impedance spectroscopy was applied to determine the effect of gaseous atmosphere on electrical conductivity of the sintered yttrium stabilized with zirconium oxide (3YSZ). First stage of the research was preparation of yttrium powder stabilized with zirconium oxide by using the gelatine method. In this way, the received material of white colour and content of 97% mol. zirconium oxide and 3% yttrium was obtained. Using the frequency spectrometer a large number of measurements in the temperature range of 300-700°C for three selected atmospheres: air, air after hydrogen and mixture: 10% hydrogen, 90% argon, was made. The results are summarized in graphs of Niquist’a and charts of activation energy of a sample with a silver electrode and the platinum.
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