Singh, M.Raghuwanshi, S.K.Prakash, O.Kumar, P.K.2026-02-052020Optik, 2020, 212, , pp. -304026https://doi.org/10.1016/j.ijleo.2020.164698https://idr.nitk.ac.in/handle/123456789/23872a fiber optic strain sensor is proposed and experimentally demonstrated using fiber Bragg grating (FBG) based interrogation scheme. Due to fast response time and better sensitivity of graphene oxide (GO) material, coated linearly chirped fiber Bragg grating (LCFBG) is used in this work. Interrogation scheme is used for the efficient strain sensing by placing LCFBG within the Sagnac loop (wavelength dependent receiver). The GO deposition is confirmed by ultraviolet–visible spectroscopy, atomic force microscopy (AFM), and field emission scanning electron micrograph (FESEM). Our proposed fiber optic strain sensor possesses better resolution, stable operation in the infra-red region. In addition, sensor demonstrates 5.25 ?? static strain and 0.645 ??/?Hz dynamic strain resolutions, respectively. © 2020 Elsevier GmbHComposite bridgesFiber optic sensorsFiber opticsFibersGrapheneScanning electron microscopyFast response timeFiber optic strain sensorField emission scanningHigh resolutionLinearly chirped bragg gratingsLinearly chirped fiber Bragg gratingsStable operationVisible spectroscopyFiber Bragg gratings