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[1572] Artykuł: Uncertainty Analysis of Impedance Measurements in the sampling Sensor Instrument(Analiza niepewności pomiaru impedancji w przyrządzie z przetwornikiem próbkującym)Czasopismo: Proceedings of the IMEKO-TC7 Symposium "Measurement Science of The Information Era" Opublikowano: 2002 Autorzy / Redaktorzy / Twórcy
Grupa MNiSW: Recenzowany referat w materiałach konferencyjnych w języku angielskim Punkty MNiSW: 0 Pełny tekst Keywords: Sampling Sensor  Impedance Measurements  LMS Method  Fitting Sine Wave Algorithms  Covariance Matrix  and Uncertainty Analysis  |
The algorithms based on digital signal processing for impedance components’ evaluation in circuits with sampling transducer have been analysed. It is supposed that the voltage and current are sampled synchronously to the fundamental frequency of the generated sinusoidal signal. Two fitting sine wave algorithms, which are based on the least mean square (LMS) technique, have been described. The first one reconstructs indirect measurement method. The second algorithm estimates the unknown
impedance components by direct method. The uncertainty’s propagation by described algorithms can be analysed by means of covariance matrix. The elements of covariance matrix are dependent on the phase angles of the measurement signals. It is shown that those algorithms provide minimization of uncertainty for selected numer of samples and phase angles. The influence’s simulations of quantization error of the AD converter and jitters of sampling time for described algorithms on uncertainty processing results have been carried out.