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Shielded soft force sensors

Author

Listed:
  • Bekir Aksoy

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Yufei Hao

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Giulio Grasso

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Krishna Manaswi Digumarti

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Vito Cacucciolo

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Herbert Shea

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

Abstract

Force and strain sensors made of soft materials enable robots to interact intelligently with their surroundings. Capacitive sensing is widely adopted thanks to its low power consumption, fast response, and facile fabrication. Capacitive sensors are, however, susceptible to electromagnetic interference and proximity effects and thus require electrical shielding. Shielding has not been previously implemented in soft capacitive sensors due to the parasitic capacitance between the shield and sensing electrodes, which changes when the sensor is deformed. We address this crucial challenge by patterning the central sensing elastomer layer to control its compressibility. One design uses an ultrasoft silicone foam, and the other includes microchannels filled with liquid metal and air. The force resolution is sub-mN both in normal and shear directions, yet the sensor withstands large forces (>20 N), demonstrating a wide dynamic range. Performance is unaffected by nearby high DC and AC electric fields and even electric sparks.

Suggested Citation

  • Bekir Aksoy & Yufei Hao & Giulio Grasso & Krishna Manaswi Digumarti & Vito Cacucciolo & Herbert Shea, 2022. "Shielded soft force sensors," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32391-0
    DOI: 10.1038/s41467-022-32391-0
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    References listed on IDEAS

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    1. Jae-Soon Yang & Myung-Kun Chung & Jae-Young Yoo & Min-Uk Kim & Beom-Jun Kim & Min-Seung Jo & Sung-Ho Kim & Jun-Bo Yoon, 2025. "Interference-free nanogap pressure sensor array with high spatial resolution for wireless human-machine interfaces applications," Nature Communications, Nature, vol. 16(1), pages 1-11, December.

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