Zonal selectivity by sensitivity modulation in linear tetrapolar impedance sensors

SENSORS AND ACTUATORS B-CHEMICAL

卷:255

Article

Moretti, Fabian N.¹  Cabrera, Jorge L.¹  Madrid, Rossana E.^2,3 

[1] UTN, FRA, Grp Tecnol Biomed, GTB Group, Buenos Aires, DF, Argentina

[2] Consejo Nacl Invest Cient & Tecn, Inst Super Invest Biolog INSIBIO, San Miguel De Tucuman, Tucuman, Argentina

[3] Univ Nacl Tucuman, Dept Bioingn, Fac Cs Exactas & Tecnol, Lab Medios & Interfuses LAMEIN, San Miguel De Tucuman, Tucuman, Argentina

关键词: Sensitivity;    Tetrapolar measurement;    Impedance sensors;    MEA;    Mems;    EIS;   

DOI  :  10.1016/j.snb.2017.08.115

来源: Elsevier

【 摘 要 】

This work investigates the behaviour of a tetrapolar impedance sensor due to sensitivity issues caused by inherent method measurement when inter-electrode spacing is changed. Finite Element Method (FEM) modelling of the sensitivity spectra was computed to analyse maximum sensitivity levels in desired zones of the sample and non-common known and unintuitive phenomenon as negative sensitivity lobes inside the sensitivity distribution field. Sensitivity maps as a function of electrode position were obtained and maximum sensitivity curves were extracted to identify the best configuration for major sensitivity contribution to characterize a specific sample section. A prototype of a linear tetrapolar sensor array of planar microelectrodes for sensing ionic samples was used for the computational modelling and a brief experimental validation was performed to show the vertical stratification process. The analysis shows that it is possible to have zonal selectivity in the impedance measurement and characterize a desired zone of the sample modulating the sensitivity, changing the electrode position by a scale pattern. This manuscript offers a novel approach for designing tetrapolar sensors based on analyzing maximum sensitivity curves obtained by FEM modelling. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free