Fiber curvature sensor based on spherical-shape structures and long-period grating |
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| Affiliation: | 1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China;2. City Institute, Dalian University of Technology, Dalian 116600, China;1. Department of Physics, Indian Institute of Technology Kanpur, U.P. 208016, India;2. Photonics Research Center, Université du Québec en Outaouais, Quebec, QC J8X 3X7, Canada;1. Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electronics Information Engineering, Tianjin University of Technology, Tianjin 300384, China;2. College of Precision Instruments and Opto-Electronics Engineering, Institute of Laser & Optoelectronics, Tianjin University, Tianjin 300072, China;3. Institute of Modern Optics, Nankai University, Tianjin 300071, China;1. College of Science, Chongqing University of Technology, Chongqing 400054, China;2. Chongqing Key Laboratory of Green Energy Materials Technology and Systems, Chongqing 400054, China |
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| Abstract: | A novel curvature sensor based on optical fiber Mach–Zehnder interferometer (MZI) is demonstrated. It consists of two spherical-shape structures and a long-period grating (LPG) in between. The experimental results show that the shift of the dip wavelength is almost linearly proportional to the change of curvature, and the curvature sensitivity are −22.144 nm/m−1 in the measurement range of 5.33–6.93 m−1, −28.225 nm/m−1 in the range of 6.93–8.43 m− and −15.68 nm/m−1 in the range of 8.43–9.43 m−1, respectively. And the maximum curvature error caused by temperature is only −0.003 m−1/°C. The sensor exhibits the advantages of all-fiber structure, high mechanical strength, high curvature sensitivity and large measurement scales. |
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| Keywords: | Optical fiber curvature sensor Spherical-shape structure Mach–Zehnder interferometer |
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