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Simultaneous distributed measurement of the strain and temperature for a four-point bending test using polarization-maintaining fiber Bragg grating interrogated by optical frequency domain reflectometry |
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| Affiliation: | 1. Japan Aerospace Exploration Agency, 6-13-1 Osawa, Mitaka-shi, Tokyo 181-0015, Japan;2. The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. State Key Laboratory of Tribology & Institute of Manufacturing Engineering, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2. Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing 100084, China;3. Mechanical and Energy Engineering Department, South University of Science and Technology of China, Shenzhen 518055, China;1. College of Electric and Control Engineering, Xi’an University of Science and Technology, 58 Yan-Ta Road, Xi’an 710054, China;2. Department of Electronic Engineering, National Chin-Yi University of Technology, 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 41170, Taiwan;1. School of Control and Computer Engineering, North China Electric Power University, Changping District, Beijing 102206, China;2. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing 102206, China |
| Abstract: | We demonstrate a simultaneous distributed strain and temperature measurement technique with the spatial resolution of 1 mm using fiber Bragg gratings inscribed in a polarization-maintaining and absorption-reducing fiber (PANDA-FBGs) and optical frequency domain reflectometry (OFDR). We conduct four-point bending tests in an environmental chamber. Using high birefringent PANDA-FBGs that are manufactured specifically for the simultaneous measurements, the uniform temperature distributions and the typical strain distribution profiles of the four-point bending tests were successfully obtained. The measurement errors of strain were from ?31 με to 19 με, and of temperature were from ?0.9 °C to 1.3 °C. The spatial standard deviation was 7.5 με and 0.9 °C. We also discussed the effect of the residual strain of the sensor-bonding procedures and the data averaging. |
| Keywords: | Distributed sensing Fiber Bragg grating (FBG) Optical fiber sensor Optical frequency domain reflectometry (OFDR) Polarization maintaining fiber Simultaneous strain and temperature measurement |
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