Low-hysteresis and low-interference soft tactile sensor using a conductive coated porous elastomer and a structure for interference reduction

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The need for soft whole-body tactile sensors is emerging. Piezoresistive materials are advantageous in terms of making large tactile sensors, but the hysteresis of piezoresistive materials is a major drawback. The hysteresis of a piezoresistive material should be attenuated to make a practical piezoresistive soft tactile sensor. In this paper, we introduce a low-hysteresis and low-interference soft tactile sensor using a conductive coated porous elastomer and a structure to reduce interference (grooves). The developed sensor exhibits low hysteresis because the transduction mechanism of the sensor is dominated by the contact between the conductive coated surface. In a cyclic loading experiment with different loading frequencies, the mechanical and piezoresistive hysteresis values of the sensor are less than 21.7% and 6.8%, respectively. The initial resistance change is found to be within 4% after the first loading cycle. To reduce the interference among the sensing points, we also propose a structure where the grooves are inserted between the adjacent electrodes. This structure is implemented during the molding process, which is adopted to extend the porous tactile sensor to large-scale and facile fabrication. The effects of the structure are investigated with respect to the normalized design parameters θ
Publisher
ELSEVIER SCIENCE SA
Issue Date
2019-08
Language
English
Article Type
Article
Citation

SENSORS AND ACTUATORS A-PHYSICAL, v.295, pp.541 - 550

ISSN
0924-4247
DOI
10.1016/j.sna.2019.06.026
URI
http://hdl.handle.net/10203/263155
Appears in Collection
ME-Journal Papers(저널논문)
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