Low-Cost Impedance Spectroscopy System Based on a Logarithmic Amplifier

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. Thi...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2015-05, Vol.64 (5), p.1110-1117
Main Authors: Grassini, Sabrina, Corbellini, Simone, Angelini, Emma, Ferraris, Franco, Parvis, Marco
Format: Article
Language:English
Subjects:
Bioelectrical impedance analysis (BIA)
corrosion assessment
Current measurement
electrochemical impedance spectroscopy (EIS)
Frequency measurement
Impedance
Impedance measurement
impedance spectroscopy (IS)
logarithmic amplifiers
Signal to noise ratio
Uncertainty
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 GQ. 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.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2014.2371191