Hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer and ripple shift measurement |
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| Authors: | Daru Chen Xin Cheng H.Y. Tam |
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| Affiliation: | 1. Institute of Information Optics, Zhejiang Normal University, Jinhua 321004, China;2. Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Special Administrative Region;1. Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China;2. Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Electronics Information Engineering, Tianjin University of Technology, Tianjin, 300384 China;1. School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;2. Xuzhou Key Laboratory of Artificial Intelligence and Big Data, Xuzhou, Jiangsu, 221116, China;1. College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;2. School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;1. Institute of Laser & Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;2. Chengdu Documentation and Information Center, CAS, Chengdu 610065, China |
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| Abstract: | ![]()
We propose a hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer (TCFMI). A thin-core fiber is spliced to a single mode fiber forming a single-end fiber modal interferometer (FMI) due to the core mismatch and the fiber end reflection. Relative reflection spectra of TCFMIs based on thin-core fibers with different lengths are investigated. The TCFMI is gold-coated to enhance the optical reflectivity, which also results in the ripple of the relative reflection spectra of TCFMI. A high hydrostatic pressure sensor test system is proposed and the performance of the pressure sensor has been experimentally investigated. A pure-ripple-shift measurement method is used to achieve the demodulation of the sensor. The proposed pressure sensor has a sensing range up to 40 MPa and a sensitivity of 44.8 pm/MPa. |
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