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Optical Engineering

Curvature and temperature sensor based on bulge-taper structures interferometer with embedded fiber Bragg grating
Author(s): Cheng Zhang; Junfa Zhao; Changyun Miao; Hongqiang Li; Hua Bai; Meiling Zhang
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Paper 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.

Paper Details

Date Published: 20 August 2015
PDF: 6 pages
Opt. Eng. 54(8) 087104 doi: 10.1117/1.OE.54.8.087104
Published in: Optical Engineering Volume 54, Issue 8
Show Author Affiliations
Cheng Zhang, Tianjin Polytechnic Univ. (China)
Junfa Zhao, Tianjin Polytechnic Univ. (China)
Changyun Miao, Tianjin Polytechnic Univ. (China)
Hongqiang Li, Tianjin Polytechnic Univ. (China)
Hua Bai, Nankai Univ. (China)
Tianjin Polytechnic Univ. (China)
Meiling Zhang, Tianjin Polytechnic Univ. (China)

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