期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 263, 期 -, 页码 677-686出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2017.07.031
关键词
Tactile sensor; Optical fiber sensor; Fiber specklegram sensor; Sensor data fusion; Force measurement
资金
- Sao Paulo Research Foundation (FAPESP) [2014/25080-0]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenadoria de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
The development of a tactile sensor based on optical fiber specklegram analysis is reported. The device is comprised of 9 microbending transducers connected to 3 multimode fibers, and attached to a 30 x 30 mm(2) touching surface in a matrix arrange. The output fiber speckle fields, produced by coherent light transmission through the multimode waveguides, are processed for evaluation of the normalized inner-product coefficients, being further correlated to the external load characteristics according to a specklegram referencing approach. Finally, the magnitude and location of the forces applied over the tactile frame are estimated by means of a data fusion technique, yielding the probabilistic distribution of the mechanical disturbances. The sensor characterization indicated a 0.5 N-1 sensitivity, with capability to detect variations of 1 mm in force location, being comparable to the requirements for tactile technologies. Moreover, the data fusion approach provided the estimation of the load distribution with 0.86 relative accuracy, allowing the assessment of tactile variables based on the response of only 3 sensing fibers and without utilizing wavelength multiplexing schemes. (C) 2017 Elsevier B.V. All rights reserved.
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