Błędy pomiarów transmitancji z pseudolosowymi sygnałami wymuszającymi

• Autorzy: Giżewski S. , Krzywaźnia A. , Ociepka J.

Warianty tytułu

EN

Errors of transfer function measurement based on pseudorandom testing signals

• Języki publikacji: PL

Abstrakty

EN

Methods of measurement of spectral transfer function based on wide-band testing signals have been investigated since 70'th of the last century. The methods are attractive practically as they offer possibility of determination of transfer function in many frequency points basing on only one realization of measurement procedure. Now a few typical solutions are practically used that are based on using binary or ternary pseudorandom sequences, synthesized multi-sine and impulse signals. The impulse and binary or ternary pseudorandom sequences signals have spectral power density function corresponding to a squared-sinc function (sinx/x)2, which leads to aliasing errors if sampling technique and digital signal processing are employed. The primary task of the paper is estimation of measuring errors of transfer function of linear inertial objects when pseudorandom binary or ternary sequences of maximum length are used as the test signals. Particularly, influence of parameters of sampling analog-to-digital conversion and object parameters (order, corner frequency) on measuring uncertainty has been investigated by means of computer simulation. Selection of sampling frequency selection has been considered.

Słowa kluczowe

PL

pomiar transmitancji; błędy pomiarów transmitancji; współczynnik Fouriera

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Włókienniczy - Włókno, Odzież, Skóra
• Rocznik: 2008
• Tom: nr 7
• Strony: 27--30
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Giżewski S.

autor

Krzywaźnia A.

autor

Ociepka J.

• Instytut Inżynierii Biomedycznej i Pomiarów Politechniki Wrocławskiej

Bibliografia

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• 3. Nebuya S., Brown B. H., Smallwood R. H., Milnes P., Waterworth A. R., Noshiro M., Measurement of High Frequency Electrcal Transfer Impedances from Biological Tissues, Electronic Letters, vol. 35, no 23, 11-th Nov 1999, s. 1985-1987.
• 4. Gordon R., Land R., Min M. , Parve T., Salo R., A Virtual System for Simultaneous Multi-frequency Measurement of Electrical Bioimpedance, IJBM, vol. 7, no 1, 2005, s. 243-246.
• 5. Ai Hui Tan, Godfrey K. R., Barker H. A., Design of Computer-Optimized Pseudorandom Maximum Length Signals for Linear Identification in the Presence of Nonlinear Distortions, IEEE Trans. Instrum. Meas., vol. 54, no 6, Dec. 2005, s. 2513-2519.
• 6. Ai Hui Tan, M.F.L. Foo, Ternary Pseudorandom Signal Design for Uniform Excitation and Reduced Effect of Nonlinear Distortion, Electronics Letters, vol. 42, no 12, 8th June 2006, s. 676-677.