Compliant Mechanism-Based Sensor for Large Strain Measurements Employing Fiber Optics

Oleg Shiryayev, Nader Vahdati, Fook Fah Yap, Haider Butt

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We propose a sensor design for measurement of large strains where direct application of a fiber optic strain gauge is impossible due to the stiffness mismatch between the optical fiber and the structure under test. The sensor design is based on a rhombus type compliant mechanism, which functions to attenuate input strain and transfer it to the ends of the sensing beam with the mounted optical strain gauge. We developed an analytical model of the sensor, which allows us to relate actuation forces, input displacement/strain, and output strain. The analytical model was verified with the finite element analysis and validated against an experimental prototype. The prototype sensor was able to handle input strains exceeding ±2.5 × 105 µε. Potential application areas of the proposed sensor include compliant elastomeric structures, wearables, and soft robotics.

Original languageBritish English
Article number3987
JournalSensors (Switzerland)
Issue number11
StatePublished - 1 Jun 2022


  • compliant mechanisms
  • Fiber Bragg Gratings
  • large deformations
  • optical fiber
  • strain


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