Texture Discrimination using a Soft Biomimetic Finger for Prosthetic Applications

Darshini Balamurugan, Andrei Nakagawa-Silva, Harrison Nguyen, Jin Huat Low, Christopher Shallal, Luke Osborn, Alcimar Barbosa Soares, Raye Chen Hua Yeow, Nitish Thakor

Research output: Contribution to journalArticle

Abstract

Soft robotic fingers have shown great potential for use in prostheses due to their inherent compliant, light, and dexterous nature. Recent advancements in sensor technology for soft robotic systems showcase their ability to perceive and respond to static cues. However, most of the soft fingers for use in prosthetic applications are not equipped with sensors which have the ability to perceive texture like humans can. In this work, we present a dexterous, soft, biomimetic solution which is capable of discrimination of textures. We fabricated a soft finger with two individually controllable degrees of freedom with a tactile sensor embedded at the fingertip. The output of the tac- tile sensor, as texture plates were palpated, was converted into spikes, mimicking the behavior of a biological mechanoreceptor. We explored the spatial properties of the textures captured in the form of spiking patterns by generating spatial event plots and analyzing the similarity between spike trains generated for each texture. Unique features representative of the different textures were then extracted from the spikes and input to a classifier. The textures were successfully classified with an accuracy of 94% when palpating at a rate of 42 mm/s. This work demonstrates the potential of providing amputees with a soft finger with sensing capabilities, which could potentially help discriminate between different objects and surfaces during activities of daily living (ADL) through palpation.

Original languageEnglish (US)
Pages (from-to)380-385
Number of pages6
JournalIEEE ... International Conference on Rehabilitation Robotics : [proceedings]
Volume2019
DOIs
StatePublished - Jun 1 2019

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ASJC Scopus subject areas

  • Medicine(all)

Cite this

Balamurugan, D., Nakagawa-Silva, A., Nguyen, H., Low, J. H., Shallal, C., Osborn, L., Soares, A. B., Yeow, R. C. H., & Thakor, N. (2019). Texture Discrimination using a Soft Biomimetic Finger for Prosthetic Applications. IEEE ... International Conference on Rehabilitation Robotics : [proceedings], 2019, 380-385. https://doi.org/10.1109/ICORR.2019.8779442