Improvement of the fast impedance spectroscopy method using square pulse excitation

Published in: Proceedings of the 14th Joint International IMEKO TC1 + TC7 + TC 13 Symposium : "Intelligent quality measurements - theory, education and training" ; in conjunction with the 56th IWK, Ilmenau University of Technology and the 11th SpectroNet Collaboration Forum ; 31. August - 2. September 2011, JenTower Jena, Germany. - Ilmenau : Univ.-Bibliothek, ilmedia, 2011. URN: urn:nbn:de:gbv:ilm1-2011imeko:

Using A Particular Sampling Method for Impedance Measurement

The paper presents an impedance measurement method using a particular sampling method which is an alternative to DFT calculation. The method uses a sine excitation signal and sampling response signals proportional to current flowing through and voltage across the measured impedance. The object impedance is calculated without using Fourier transform. The method was first evaluated in MATLAB by means of simulation. The method was then practically verified in a constructed simple impedance measurement instrument based on a PSoC (Programmable System on Chip). The obtained calculation simplification recommends the method for implementation in simple portable impedance analyzers destined for operation in the field or embedding in sensors

Using A Particular Sampling Method for Impedance Measurement

The paper presents an impedance measurement method using a particular sampling method which is an alternative to DFT calculation. The method uses a sine excitation signal and sampling response signals proportional to current flowing through and voltage across the measured impedance. The object impedance is calculated without using Fourier transform. The method was first evaluated in MATLAB by means of simulation. The method was then practically verified in a constructed simple impedance measurement instrument based on a PSoC (Programmable System on Chip). The obtained calculation simplification recommends the method for implementation in simple portable impedance analyzers destined for operation in the field or embedding in sensors

High impedance spectroscopy analyzer using DSP

W artykule przedstawiono opracowany i wdrożony do produkcji seryjnej analizator do spektroskopii wysokoimpedancyjnej. Dzięki zastosowaniu obwodu wejściowego w postaci sondy pomiarowej (2 i 3 zaciskowej) analizator umożliwia pomiary w zakresie 100 &Omega; < |Zx| < 100 G&Omega;. Do wyznaczania składowych ortogonalnych sygnałów pomiarowych wykorzystano technikę cyfrowego przetwarzania sygnałów. Pozwoliła ona na pomiary w szerokim zakresie częstotliwości od bardzo niskich 100 &Mu;Hz do 1 MHz. Analiza rzeczywistych parametrów sond, umożliwiła wyznaczenie zależności korygujących wyniki pomiaru, które zaimplementowane w oprogramowaniu analizatora, zwiększyły dokładność pomiaru impedancji.The paper presents the developed high impedance spectroscopy analyzer which was putted into production. The analyzer allows to measure in the range of 100&Omega; < |Zx| < 100 G&Omega; thanks to the usage of the input circuitry in form of the measurement probe (2 and 3 terminal). The digital signal processing technique was used to determine orthogonal parts of the measurement signals. This allows measuring in a wide frequency range from very low 100 &Mu;Hz up to 1 MHz. The analysis of the real-life parameters of the probes made possible evaluation of correction formulas which were implemented in analyzer software and increased accuracy of the impedance measurement