Zonal selectivity by sensitivity modulation in linear tetrapolar impedance sensors

 

Autores
Moretti, Fabián N.; Cabrera, Jorge L.; Madrid, Rossana Elena
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2018
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
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.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/53857
Enlace del recurso
http://hdl.handle.net/11336/53857
Nivel de acceso
Acceso abierto
Materia
EIS
IMPEDANCE SENSORS
MEA
MEMS
SENSITIVITY
TETRAPOLAR MEASUREMENT
Ingeniería de Sistemas y Comunicaciones
Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Información
INGENIERÍAS Y TECNOLOGÍAS