title: A four-electrode low frequency impedance spectroscopy measurement system using the AD5933 measurement chip.
abstract: This paper presents the design of a four electrode impedance measurement circuit dedicated to bioimpedance embedded applications. It extends the use of the AD5933 measurement chip to allow it to operate in a four electrode configuration in order to limit the effects of the parasitic impedances between the medium under test and the electrodes. The circuit has shown a good measurement accuracy on various test circuits. In association with a four microband electrode system it has been successfully used to characterize small physiological samples (50 μl) with conductivities ranging from 0.14 to 1.2 S m(-1). It can be used as an alternative bioimpedance measurement approach for embedded applications operating in the four electrode configuration.
authors.affiliation: LPEM, UMR8213, ESPCI-ParisTech, 10 Rue Vauquelin, 75005 Paris, France. cedric.margo@espci.fr
authors.forename: C
authors.initials: C
authors.lastname: Margo
authors.forename: J
authors.initials: J
authors.lastname: Katrib
authors.forename: M
authors.initials: M
authors.lastname: Nadi
authors.forename: A
authors.initials: A
authors.lastname: Rouane
mesh_terms: D002138:Calibration; D058266:Dielectric Spectroscopy / Q000379:methods*; D004560:Electricity; D004566:Electrodes; D004581:Electronics / Q000295:instrumentation*; D007477:Ions; D012996:Solutions
chemical_list: D007477:Ions; D012996:Solutions