Abstract

A dual-FBG and F-P cavity compound optical fiber sensor based on a multi-core fiber (MCF) is proposed. A hollow core fiber (HCF) was fused between a single-mode fiber (SMF) and a MCF to form the F-P cavity. Two FBGs with different reflective wavelength were prepared on a side core (SC) and the central core (CC) of MCF respectively. An asymmetric 45° reflector was fabricated at the end of the MCF to make the optical path of the dual-FBG and the F-P cavity in series. The combination of the F-P cavity and the FBG on the CC can measure temperature and axial strain, simultaneously, while both of them are insensitive to bending. The FBG on the SC is sensitive to bending and can be used for curvature measurement, and the temperature and axial strain compensation can be achieved by the combination of the F-P cavity and FBG on the CC. Therefore, the curvature, axial strain and temperature can be measured simultaneously by the compound sensor on a single optical fiber.

Bending insensitive sensors for strain and temperature measurements with Bragg gratings in Bragg fibers

Ningliang Liu, Yuhua Li, Ying Wang, Haiyan Wang, Wenbin Liang, and Peixiang Lu
Opt. Express 19(15) 13880-13891 (2011)

Metal-coated high-temperature strain optical fiber sensor based on cascaded air-bubble FPI-FBG structure

Jianqiao Liang, Yang Yu, Qiang Bian, Wenjie Xu, Zhencheng Wang, Shumao Zhang, Junjie Weng, Jiajian Zhu, Yong Chen, Xiaoyang Hu, Junbo Yang, and Zhenrong Zhang
Opt. Express 31(10) 16795-16811 (2023)

Hybrid LPFG/MEFPI sensor for simultaneous measurement of high-temperature and strain

Yun-Jiang Rao, Zeng-Ling Ran, Xian Liao, and Hong-You Deng
Opt. Express 15(22) 14936-14941 (2007)

Ultra-compact in-core-parallel-written FBG and Mach–Zehnder interferometer for simultaneous measurement of strain and temperature

Ke Tian, Mingyuan Zhang, Zhiyuan Zhao, Ruoning Wang, Dejun Liu, Xin Wang, Elfed Lewis, Gerald Farrell, and Pengfei Wang
Opt. Lett. 46(22) 5595-5598 (2021)

Linearly chirped tapered fiber-Bragg-grating-based Fabry–Perot cavity and its application in simultaneous strain and temperature measurement

Konrad Markowski, Kazimierz Jędrzejewski, Michał Marzęcki, and Tomasz Osuch
Opt. Lett. 42(7) 1464-1467 (2017)