Article

Strain and Temperature Discrimination Using Modal Interferometry in Bragg Fibers

IEEE Photonics Technology Letters (Impact Factor: 2.18). 12/2010; DOI: 10.1109/LPT.2010.2076357
Source: IEEE Xplore

ABSTRACT The strain and temperature sensing characteristics of a modal interferometer based on two Bragg fibers have been investigated. The special nature of this sensor is that the two Bragg fibers used present a different external cladding shape. It appears that the sensitivity to the sensing parameters are different for the two Bragg fibers, which makes it possible to fabricate several sensing configurations based on the combination of these two Bragg fibers for strain and temperature discrimination.

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Available from: Orlando Frazão, Aug 31, 2015
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    • "FBG in MOF 15.3 [13] Bragg Fibers 21.3 [14] FBG in Taper 26.4 [15] Tilted FBG 39.4 [16] FBG + MMF 45.0 [17] Type IA/IIA 55.3 [18] verified through the condition number of the matrix, which is an algebraic quantity that provides a qualitative estimate for the sensitivity of the solution of a system of linear equations [11]. The larger the condition number of the matrix, the larger the upper bound for the relative error. "
  • Source
    • "FBG in MOF 15.3 [13] Bragg Fibers 21.3 [14] FBG in Taper 26.4 [15] Tilted FBG 39.4 [16] FBG + MMF 45.0 [17] Type IA/IIA 55.3 [18] verified through the condition number of the matrix, which is an algebraic quantity that provides a qualitative estimate for the sensitivity of the solution of a system of linear equations [11]. The larger the condition number of the matrix, the larger the upper bound for the relative error. "
  • Source
    • "FBG in MOF 15.3 [13] Bragg Fibers 21.3 [14] FBG in Taper 26.4 [15] Tilted FBG 39.4 [16] FBG + MMF 45.0 [17] Type IA/IIA 55.3 [18] verified through the condition number of the matrix, which is an algebraic quantity that provides a qualitative estimate for the sensitivity of the solution of a system of linear equations [11]. The larger the condition number of the matrix, the larger the upper bound for the relative error. "
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    ABSTRACT: Tapering single-mode-multimode-single-mode structures to enhance sensitivity is proposed and experimentally demonstrated. 50-mm-long coreless multimode fiber sections are spliced between single-mode fibers (SMFs) and tapered. They are characterized in strain, and an increase in strain sensitivity is obtained with taper diameter reduction. Sensitivities as high as -23.69pm/με for the 15-μm taper are attained. Temperature sensitivities also depend on taper diameter. A combination of two different diameter tapered SMF MMF-SMF structures, with cross-sensitivity to strain and temperature, is proposed as a sensing system for the simultaneous measurement of strain and temperature with resolutions of ±5.6 με and ±1.6°C, respectively. A good condition number of 3.16 is achieved with this sensing structure.
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