Yoon, S. Yu, M. Kim, E. Yu, Jaesang 2024-01-19T15:01:04Z 2024-01-19T15:01:04Z 2021-09-02 2021-05 1424-8220 https://pubs.kist.re.kr/handle/201004/117105 Distributed optical fiber sensors are a promising technology for monitoring the structural health of large-scale structures. The fiber sensors are usually coated with nonfragile materials to protect the sensor and are bonded onto the structure using adhesive materials. However, local deformation of the relatively soft coating and adhesive layers hinders strain transfer from the base structure to the optical fiber sensor, which reduces and distorts its strain distribution. In this study, we analytically derive a strain transfer function in terms of strain periods, which enables us to understand how the strain reduces and is distorted in the optical fiber depending on the variation of the strain field. We also propose a method for back-calculating the base structure’s strain field using the reduced and distorted strain distribution in the optical fiber sensor. We numerically demonstrate the back-calculation of the base strain using a composite beam model with an open hole and an attached distributed optical fiber sensor. The new strain transfer function and the proposed back-calculation method can enhance the strain field estimation accuracy in using a distributed optical fiber sensor. This enables us to use a highly durable distributed optical fiber sensor with thick protective layers in precision measurement. ？ 2021 by the authors. Licensee MDPI, Basel, Switzerland. English Multidisciplinary Digital Publishing Institute (MDPI) Strain transfer function of distributed optical fiber sensors and back-calculation of the base strain field Article 10.3390/s21103365 1 Sensors, v.21, no.10 Sensors 21 10 Y scie scopus 000662522300001 2-s2.0-85105491284 Chemistry, Analytical Engineering, Electrical & Electronic Instruments & Instrumentation Chemistry Engineering Instruments & Instrumentation Article Adhesives Fiber optic sensors Optical fibers Structural health monitoring Adhesive materials Composite beam model Distributed optical fiber sensors Large scale structures Local deformations Precision measurement Strain distributions Structural health Transfer functions Distributed optical fiber sensor Strain back-calculation Strain transfer function Structural health monitoring