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Journal of Sensors
Volume 2018, Article ID 6506239, 8 pages
https://doi.org/10.1155/2018/6506239
Research Article

Tactile Sensor Array with Fiber Bragg Gratings in Quasi-Distributed Sensing

1Graduate Program in Electrical and Computer Engineering, Federal University of Technology-Paraná, Curitiba, PR, Brazil
2Federal Institute of Education, Science and Technology of Mato Grosso do Sul, Aquidauana, MS, Brazil

Correspondence should be addressed to José L. Fabris; rb.ude.rpftu@sirbaf

Received 30 August 2017; Accepted 14 December 2017; Published 13 February 2018

Academic Editor: Carlos Ruiz

Copyright © 2018 Marcelo A. Pedroso et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work describes the development of a quasi-distributed real-time tactile sensing system with a reduced number of fiber Bragg grating-based sensors and reports its use with a reconstruction method based on differential evolution. The sensing system is comprised of six fiber Bragg gratings encapsulated in silicone elastomer to form a tactile sensor array with total dimensions of 60 × 80 mm, divided into eight sensing cells with dimensions of 20 × 30 mm. Forces applied at the central position of the sensor array resulted in linear response curves for the gratings, highlighting their coupled responses and allowing the application of compressive sensing. The reduced number of sensors regarding the number of sensing cells results in an undetermined inverse problem, solved with a compressive sensing algorithm with the aid of differential evolution method. The system is capable of identifying and quantifying up to four different loads at four different cells with relative errors lower than 10.5% and signal-to-noise ratio better than 12 dB.