Analytical investigation of response of birefringent fiber Bragg grating sensors in distributed monitoring system based on optical frequency domain reflectometry |
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| Institution: | 1. School of Electronics Engineering, KIIT – Deemed to be University, Bhubaneswar, India;2. Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India;1. School of Computer Science and Engineering, Xi''an University of Technology, Xi''an 710048, China;2. Shannxi Province Key Lab of Thin Film Technology and Optical Test, Xi''an Technological University, Xi''an 710048, China;1. Institute of Physics, University of Zielona Gora, Prof. Szafrana 4a, 65-516 Zielona Gora, Poland;2. Department of Physics, Hong Duc University, 565 Quang Trung Street, Thanh Hoa City, Viet Nam;3. Department of Physics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland;4. Glass Department, Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland;5. National Institute of Telecommunications, Szachowa 1, 04-894 Warsaw, Poland;1. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China;2. Academy of flight Technology and Safety, Civil Aviation Flight University of China, Guanghan 618307, China;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;2. Center of Ultra-precision Optoelectronic Instrument, Harbin Institute of Technology, Harbin 150080, China;3. Department of Transportation and Environmental Systems, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan;1. Mechanical Engineering Department, Iowa State University, Ames, IA 50011, United States;2. John Deere Product Engineering Center, Waterloo, IA 50704, United States |
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| Abstract: | When Fiber Bragg gratings (FBGs) are used as strain sensors, both longitudinal and lateral strain can be applied uniformly or non-uniformly over the length of the FBGs. In order for the demodulation of such FBG signal, this paper investigates the response of birefringent FBGs which are monitored by distributed measurement system based on optical frequency domain reflectometry. A numerical model of the distributed measurement system is built based on piece-wise uniform approach, which considers polarization states of propagating lights. The numerical model simulates analytical response of birefringent FBGs especially when birefringence induces power fluctuations in the distributed spectra, which can be noise or new opportunity for sensitive monitoring of birefringence. Simulation results show the relationships between the power fluctuations and the polarization states of the propagating lights. Consequently, appropriate methods of polarization control for sensitive distributed birefringent FBG monitoring are discussed. |
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| Keywords: | Birefringence Coupled mode analysis Distributed sensing Fiber Bragg grating (FBG) Optical frequency domain reflectometry (OFDR) |
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