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Sensors 2017, 17(1), 132; doi:10.3390/s17010132

Multibeam Interferometer Using a Photonic Crystal Fiber with Two Asymmetric Cores for Torsion, Strain and Temperature Sensing

1
Center for Safety Measurement, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
2
School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 61005, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 22 November 2016 / Revised: 23 December 2016 / Accepted: 5 January 2017 / Published: 11 January 2017
(This article belongs to the Section Physical Sensors)
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Abstract

We present a fiber-optic multibeam Mach-Zehnder interferometer (m-MZI) for simultaneous multi-parameter measurement. The m-MZI is comprised of a section of photonic crystal fiber integrated with two independent cores of distinct construction and birefringence properties characterized for torsion, strain and temperature sensing. Due to the presence of small core geometry and use of a short fiber length, the sensing device demonstrates inter-modal interference in the small core alongside the dominant inter-core interference between the cores for each of the orthogonal polarizations. The output spectrum of the device is characterized by the three-beam interference model and is polarization-dependent. The two types of interferometers present in the fiber m-MZI exhibit distinct sensitivities to torsion, strain and temperature for different polarizations, and matrix coefficients allowing simultaneous measurement of the three sensing parameters are proposed in experiment. View Full-Text
Keywords: multibeam interferometer; asymmetric two-core PCF; high birefringence; torsion; strain; temperature multibeam interferometer; asymmetric two-core PCF; high birefringence; torsion; strain; temperature
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Naeem, K.; Kwon, I.-B.; Chung, Y. Multibeam Interferometer Using a Photonic Crystal Fiber with Two Asymmetric Cores for Torsion, Strain and Temperature Sensing. Sensors 2017, 17, 132.

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