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Open AccessArticle

Biomimetic Tactile Sensors with Bilayer Fingerprint Ridges Demonstrating Texture Recognition

1
Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
2
Institute of Nano Science and Technology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(10), 642; https://doi.org/10.3390/mi10100642
Received: 2 September 2019 / Revised: 20 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Tactile Sensing Technology and Systems)
In this article, we report on a biomimetic tactile sensor that has a surface kinetic interface (SKIN) that imitates human epidermal fingerprint ridges and the epidermis. The SKIN is composed of a bilayer polymer structure with different elastic moduli. We improved the tactile sensitivity of the SKIN by using a hard epidermal fingerprint ridge and a soft epidermal board. We also evaluated the effectiveness of the SKIN layer in shear transfer characteristics while varying the elasticity and geometrical factors of the epidermal fingerprint ridges and the epidermal board. The biomimetic tactile sensor with the SKIN layer showed a detection capability for surface structures under 100 μm with only 20-μm height differences. Our sensor could distinguish various textures that can be easily accessed in everyday life, demonstrating that the sensor may be used for texture recognition in future artificial and robotic fingers. View Full-Text
Keywords: biomimetic; tactile sensor; fingerprint ridge; piezoelectric sensor; texture discrimination biomimetic; tactile sensor; fingerprint ridge; piezoelectric sensor; texture discrimination
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Choi, E.; Sul, O.; Lee, J.; Seo, H.; Kim, S.; Yeom, S.; Ryu, G.; Yang, H.; Shin, Y.; Lee, S.-B. Biomimetic Tactile Sensors with Bilayer Fingerprint Ridges Demonstrating Texture Recognition. Micromachines 2019, 10, 642.

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