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Sensors 2016, 16(10), 1774; doi:10.3390/s16101774

Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

Center for Information Photonics & Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China
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Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 25 August 2016 / Revised: 18 October 2016 / Accepted: 20 October 2016 / Published: 24 October 2016
(This article belongs to the Section Physical Sensors)
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Abstract

An optical fiber temperature and torsion sensor has been proposed by employing the Lyot-Sagnac interferometer, which was composed by inserting two sections of high-birefringence (HiBi) fiber into the Sagnac loop. The two inserted sections of HiBi fiber have different functions; while one section acts as the temperature sensitive region, the other can be used as reference fiber. The temperature and twist sensor based on the proposed interferometer structure have been experimentally demonstrated. The experimental results show that the envelope of the output spectrum will shift with the temperature evolution. The temperature sensitivity is calculated to be −17.99 nm/°C, which is enlarged over 12 times compared to that of the single Sagnac interferometer. Additionally, the fringe visibility of the spectrum will change due to the fiber twist, and the test results reveal that the fringe visibility and twist angle perfectly conform to a Sine relationship over a 360° twist angle. Consequently, simultaneous torsion and temperature measurement could be realized by detecting the envelope shift and fringe visibility of the spectrum. View Full-Text
Keywords: fiber sensor; temperature and torsion sensor; Lyot-Sagnac interferometer; high-birefringence fiber fiber sensor; temperature and torsion sensor; Lyot-Sagnac interferometer; high-birefringence fiber
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shao, L.-Y.; Zhang, X.; He, H.; Zhang, Z.; Zou, X.; Luo, B.; Pan, W.; Yan, L. Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer. Sensors 2016, 16, 1774.

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