20 August 2015 Curvature and temperature sensor based on bulge-taper structures interferometer with embedded fiber Bragg grating
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Abstract
A sensor head consisting of an all single-mode fiber (SMF) in-line Mach–Zehnder interferometer (MZI) with an embedded fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of curvature and temperature. It is fabricated by cascading two bulge-taper fusion structures in a section of SMF including an FBG. The MZI is sensitive to fiber bending and ambient temperature with a sensitivity of −16.59  nm/m−1 in the range of 1.05 to 4.05  m−1 and 58  pm/°C in the range of 30°C to 100°C, respectively. However, the FBG is only sensitive to the latter with a sensitivity of 13  pm/°C. Simultaneous measurement of curvature and temperature is obtained and the cross-sensitivity issue can be solved. The experimental results show that the average relative error of the curvature is 0.38%, which is about 18 times better than that without temperature compensating. The average error of temperature is only 0.21°C.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Cheng Zhang, Cheng Zhang, Junfa Zhao, Junfa Zhao, Changyun Miao, Changyun Miao, Hongqiang Li, Hongqiang Li, Hua Bai, Hua Bai, Meiling Zhang, Meiling Zhang, } "Curvature and temperature sensor based on bulge-taper structures interferometer with embedded fiber Bragg grating," Optical Engineering 54(8), 087104 (20 August 2015). https://doi.org/10.1117/1.OE.54.8.087104 . Submission:
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