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Proceedings Paper

Fabrication of strain gauge based sensors for tactile skins
Author(s): Joshua R. Baptist; Ruoshi Zhang; Danming Wei; Mohammad Nasser Saadatzi; Dan O. Popa
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Paper Abstract

Fabricating cost effective, reliable and functional sensors for electronic skins has been a challenging undertaking for the last several decades. Application of such skins include haptic interfaces, robotic manipulation, and physical human-robot interaction. Much of our recent work has focused on producing compliant sensors that can be easily formed around objects to sense normal, tension, or shear forces. Our past designs have involved the use of flexible sensors and interconnects fabricated on Kapton substrates, and piezoresistive inks that are 3D printed using Electro Hydro Dynamic (EHD) jetting onto interdigitated electrode (IDE) structures. However, EHD print heads require a specialized nozzle and the application of a high-voltage electric field; for which, tuning process parameters can be difficult based on the choice of inks and substrates. Therefore, in this paper we explore sensor fabrication techniques using a novel wet lift-off photolithographic technique for patterning the base polymer piezoresistive material, specifically Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) or PEDOT:PSS. Fabricated sensors are electrically and thermally characterized, and temperaturecompensated designs are proposed and validated. Packaging techniques for sensors in polymer encapsulants are proposed and demonstrated to produce a tactile interface device for a robot.

Paper Details

Date Published: 22 May 2017
PDF: 10 pages
Proc. SPIE 10216, Smart Biomedical and Physiological Sensor Technology XIV, 102160F (22 May 2017); doi: 10.1117/12.2262951
Show Author Affiliations
Joshua R. Baptist, Univ. of Louisville (United States)
Ruoshi Zhang, Univ. of Louisville (United States)
Danming Wei, Univ. of Louisville (United States)
Mohammad Nasser Saadatzi, Univ. of Louisville (United States)
Dan O. Popa, Univ. of Louisville (United States)

Published in SPIE Proceedings Vol. 10216:
Smart Biomedical and Physiological Sensor Technology XIV
Brian M. Cullum; Douglas Kiehl; Eric S. McLamore, Editor(s)

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