Special Talk, Stuttgart

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Implementation of practical soft strain sensors for wearable motion sensing and tactile sensing

  • Date: Aug 23, 2017
  • Time: 13:30 - 14:30
  • Speaker: Dr. Hyosang Lee, a postdoc research fellow in Department of Mechanical Engineering, KAIST, South Korea
  • Location: MPI IS Stuttgart, Heisenbergstr. 3
  • Room: 3P 2
  • Host: Prof. Dr. Metin Sitti, Managing Director, Max Planck Institute for Intelligent Systems
  • Contact: officesitti@is.mpg.de


In this seminar, practical soft strain sensors made of piezoresistive nanocomposite are introduced and discussed. First of all, advantages and disadvantages of the nanocomposite in terms of the strain sensor are discussed. Secondly, applications of the nanocomposite to wearable motion sensing and tactile sensing are introduced. For wearable motion sensing, skin adhesive stretch sensing patch is presented. Silicone rubber mixed with multiwall carbon nanotube (MWCNT) nanocomposite was fabricated to achieve high stretchability (up to 120%) and hysteresis behavior was corrected using Prandtl-Ishilinskii model to improve the performance. This sensor can provide simple and nonintrusive motion sensing. In addition, the nanocomposite can be printed on the fabric for low-cost manufacturing. In the case of tactile sensing, anisotropic electrical impedance tomography (aEIT) based multi-axial tactile sensor is demonstrated. This special impedance mapping method reconstructs anisotropic resistivity distributions of the conductive medium using electrodes around the medium’s boundary. The tactile sensor successfully estimated lateral stretch, contact force and locations. This approach could reduce fabrication complicity for three dimensionally contoured shapes and provided durability. As a conclusion, future goals and new promising approaches are explained.

Short bio:

Dr. Hyosang Lee is currently postdoc research fellow in Department of Mechanical Engineering, KAIST, South Korea. He received the B.E. degree in mechanical engineering from the Korea University in 2010, and M.S. degree in the robotics program at KAIST in 2012. In 2017, he received Ph.D. degree in mechanical engineering from KAIST. He has studied mechatronic systems and its application to physical human robot interactions. Especially, his research focuses on the development of soft and stretchable strain sensors using piezoresistive nanocomposite. He recently developed a robotic tactile skin and this work was selected as one of the best mechanical engineering R&D achievements in KAIST.

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