Circuit analysis of matrix-like resistor networks for eliminating crosstalk in pressure sensitive mats

Medrano Sánchez, Carlos (Universidad de Zaragoza) ; Igual-Catalán, Raúl (Universidad de Zaragoza) ; Rodríguez-Ontiveros, Victor H. ; Plaza-García, Inmaculada (Universidad de Zaragoza)

Resumen: Recent advances in piezoresistive materials have opened the possibility of developing pressure sensitive flexible mats that cover large areas. They are composed of arrays of sensitive cells. However, in many configurations proposed in the literature, the measurement of a single cell does not recover the cell resistance itself but the equivalent resistance between the row and column conductive strips that select it. If this effect is not corrected, unloaded regions can appear with non negligible pressure, as a kind of ghost object. Diodes can be placed to overcome the problem, but this makes the fabrication more complex especially for prototypes. In this paper we propose a novel software solution based on a circuit analysis of the mat. The set of cell resistances is obtained from the set of equivalent resistances between row and columns. Several algorithms are compared. For simulated values of the array, the true cell resistance can be recovered with a great accuracy. A good compromise between execution speed and error is achieved by a Newton-Krylov nonlinear solver. Nevertheless, this algorithm presents convergence problems when facing values of a real mat. In this case a fixed-point formulation is more appropriate. For 16x16 arrays, it can achieve relative errors with a mean value of 0.0258 in less than 0.1 s running on a regular PC. The removal of ghost objects is also shown visually.

Idioma: Inglés

DOI: 10.1109/JSEN.2019.2918592

Año: 2019

Publicado en: IEEE SENSORS JOURNAL 19, 18 (2019), 8027-8036
ISSN: 1530-437X

Factor impacto JCR: 3.073 (2019)

Categ. JCR: ENGINEERING, ELECTRICAL & ELECTRONIC rank: 91 / 265 = 0.343 (2019) - Q2 - T2
Categ. JCR: PHYSICS, APPLIED rank: 47 / 154 = 0.305 (2019) - Q2 - T1
Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 18 / 64 = 0.281 (2019) - Q2 - T1

Factor impacto SCIMAGO: 0.749 - Instrumentation (Q1) - Electrical and Electronic Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T49-17R

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Tecnología Electrónica (Dpto. Ingeniería Electrón.Com.)
Área (Departamento): Área Ingeniería Eléctrica (Dpto. Ingeniería Eléctrica)