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Transparent and flexible force sensor array based on optical waveguide.

Youngsung Kim1, Suntak Park, Seung Koo Park

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

Optics Express
|June 21, 2012
PubMed
Summary

This study introduces a flexible optical waveguide force sensor. It measures contact force by detecting light intensity changes, with output decreasing as force increases up to -13.2 dB.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Sensor Technology

Background:

  • Developing transparent and flexible sensors is crucial for advanced human-computer interaction.
  • Optical waveguides offer potential for sensitive and non-invasive force measurement.

Purpose of the Study:

  • To develop a novel force sensor array utilizing optical waveguides.
  • To create a transparent and flexible sensor with tunable optical properties.

Main Methods:

  • Fabrication of a multi-layered optical waveguide using two soft prepolymers with differing refractive indices.
  • Design of a top cladding layer for light scattering upon contact.
  • Measurement of light intensity changes in response to applied force.

Main Results:

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  • The developed optical waveguide force sensor demonstrates a clear inverse relationship between output light intensity and applied force.
  • The sensor exhibits a measurement range from 0 to -13.2 dB.
  • The sensor material is transparent and flexible, suitable for various applications.

Conclusions:

  • The proposed optical waveguide force sensor effectively measures contact force through light intensity modulation.
  • The use of tunable refractive index prepolymers enables the creation of flexible and transparent sensing elements.
  • This technology holds promise for integration into wearable devices and soft robotics.