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Design, Fabrication and Characterisation of Multi-Parameter Optical Sensors Dedicated to E-Skin Applications.

Published version
Peer-reviewed

Type

Article

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Authors

Fliegans, Lionel 
Divay, Valentin 

Abstract

For many years there has been a strong research interest in soft electronics for artificial skin applications. However, one challenge with stretchable devices is the limited availability of high performance, stretchable, electrical conductors and semiconductors that remain stable under strain. Examples of such electronic skin require excessive amounts of wires to address each sensing element-compression force and strain-in a conventional matrix structure. Here, we present a new process for fabricating artificial skin consisting of an optical waveguide architecture, enabling wide ranging sensitivity to external mechanical compression and strain. The manufacturing process allows design of a fully stretchable polydimethylsiloxane elastomer waveguide with embedded gratings, replicated from low cost DVD-Rs. This optical artificial skin allows the detection of compression forces from 0 to 3.8 N with controllable sensitivity. It also permits monitoring of elongation deformations up to 135%. This type of stretchable optical sensor is highly robust, transparent, and presents a large sensing area while limiting the amount of wires connecting to the sensor. Thus, this optical artificial skin presents far superior mechanical properties compared to current electronic skin.

Description

Keywords

artificial skin, grating coupling, stretchable waveguide, Wearable Electronic Devices, Elastomers, Electronics, Mechanical Phenomena, Pressure

Journal Title

Sensors (Basel)

Conference Name

Journal ISSN

1424-8220
1424-8220

Volume Title

23

Publisher

MDPI AG