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Opt Express. 2012 Jun 18;20(13):14486-93. doi: 10.1364/OE.20.014486.

Transparent and flexible force sensor array based on optical waveguide.

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  • 1Electronics and Telecommunications Research Institute (ETRI),218 Gajeongno, Yuseong-gu, Daejeon 305-700, South Korea.


This paper suggests a force sensor array measuring contact force based on intensity change of light transmitted throughout optical waveguide. For transparency and flexibility of the sensor, two soft prepolymers with different refractive index have been developed. The optical waveguide consists of two cladding layers and a core layer. The top cladding layer is designed to allow light scattering at the specific area in response to finger contact. The force sensor shows a distinct tendency that output intensity decreases with input force and measurement range is from 0 to -13.2 dB.

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