Tendon-Inspired Piezoelectric Sensor for Biometric Application

Hojoon Kim, Kanghyeon Lee, Geonhui Jo, Jun Sik Kim, Myo Taeg Lim, Youngsu Cha

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this article, a novel sensing structure is proposed to measure tensile loading. The sensing structure is motivated by the operating principle of the tendon. The fibroelastic characteristic of the tendon is implemented by combining sewing and elastic threads with a piezoelectric material, that is, a tendon-inspired piezoelectric sensor. The mechanical deformation of the tendon-inspired piezoelectric sensor was analyzed by applying tensile loading. Additionally, the electrical response according to the given tensile loading was measured and compared with the theoretical expectation. The experimental results found that the sensor outputs can be represented as a linear function along with elongation in a specific range. Furthermore, the motion-detecting capability of the sensor was demonstrated using body supports with seven tendon-inspired piezoelectric sensors. To show the feasibility of its application, a real-time motion detecting system using a virtual avatar was developed. The avatar showed good synchronization with the subject's upper-limb movements. This study provides insight into the sensing characteristics of the tendon-driven piezoelectric sensor and shows the potential for biometric applications.

Original languageEnglish
Pages (from-to)2538-2547
Number of pages10
JournalIEEE/ASME Transactions on Mechatronics
Issue number5
Publication statusPublished - 2021 Oct 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) under Grant 2020R1A2C2005252.

Publisher Copyright:
© 1996-2012 IEEE.


  • Bioinspired
  • biometric
  • piezoelectric material
  • sensor

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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