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13 September 2018 Single weakly tilted FBG in 2-μm band capable of measuring temperature, axial strain, and surrounding refractive index
Dan Cheng, Fengping Yan, Ting Feng, Zhuoya Bai, Luna Zhang, Wei Wang, Shuo Liu, Hong Zhou, Yafei Hou
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Optical Engineering, Vol. 57, Issue 9, 096107 (September 2018). https://doi.org/10.1117/1.OE.57.9.096107
Abstract
Optical fiber devices and applications in the 2-μm band have been investigated extensively due to its unique advantages, such as eye safety. A fiber sensor based on tilted fiber Bragg grating with a grating plane angle of 2 deg is fabricated and experimentally tested. To the best of the authors’ knowledge, this is the first tilted fiber Bragg grating sensor to realize simultaneous measurements of temperature, axial strain, and a certain range of surrounding refractive index (SRI) at the 2-μm band. This paper uses the wavelength detection method and selects three independent resonant wavelengths as the investigated parameters. Results show that perturbations of temperature, axial strain, and SRI can shift the wavelengths of the core mode resonance and cladding mode resonance to some degree. The temperature sensitivities of the core mode and cladding mode are nearly the same, but their axial-strain sensitivities are different. Furthermore, the core mode is insensitive to the change in SRI. The sensitivities of SRI, temperature, and strain can thus be obtained by experimentally determining the wavelength shifts of the three independent resonance peaks. A 3  ×  3 matrix containing the relationship coefficients between the disturbances of temperature, axial strain, and SRI and wavelength shifts is constructed. By reversely solving the matrix equation, variations in temperature, strain, and SRI can be obtained using the experimental determination of wavelength drifts.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Dan Cheng, Fengping Yan, Ting Feng, Zhuoya Bai, Luna Zhang, Wei Wang, Shuo Liu, Hong Zhou, and Yafei Hou "Single weakly tilted FBG in 2-μm band capable of measuring temperature, axial strain, and surrounding refractive index," Optical Engineering 57(9), 096107 (13 September 2018). https://doi.org/10.1117/1.OE.57.9.096107
Received: 5 January 2018; Accepted: 22 August 2018; Published: 13 September 2018
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Cited by 5 scholarly publications.
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KEYWORDS
Cladding
Fiber Bragg gratings
Temperature metrology
Refractive index
Sensors
Fiber optics sensors
Optical fibers
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