Impedance spectroscopy (IS) involves measurements of impedance amplitudes, which often span more than six/seven decades. Currently available IS systems employ sophisticate front-ends to cope with this wide impedance range and, consequently, the cost of the measuring instrument greatly increases. This paper describes an alternative low-cost solution, which is based on a logarithmic front-end and on an off-the-shelf microcontroller board. Using these components, the cost remains below $100, while still having the capability of measuring over a frequency range of 0.01 Hz-100 kHz and for impedance values in the range of 100 Ω - 10 GΩ. The overall uncertainty remains below 5% of amplitude and few degrees of phase. The proposed system is, therefore, suitable for electrochemical impedance spectroscopy applications, as well as for bioelectrical impedance analysis.
Low-Cost Impedance Spectroscopy System Based on a Logarithmic Amplifier / Grassini, Sabrina; Corbellini, Simone; Angelini, Emma Paola Maria Virginia; Ferraris, Franco; Parvis, Marco. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - STAMPA. - 64:5(2015), pp. 1110-1117. [10.1109/TIM.2014.2371191]
|Titolo:||Low-Cost Impedance Spectroscopy System Based on a Logarithmic Amplifier|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/TIM.2014.2371191|
|Appare nelle tipologie:||1.1 Articolo in rivista|