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Strain Characterization of HighTemperature Superconductor Tapes Using Embedded Fibre Bragg Grating Sensor in Mid-rip and Parallel Configuration

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Abstract

The aim of this work was to check the feasibility of embedding fibre Bragg grating (FBG)-based sensors to study the behaviour of the second-generation yttrium barium copper oxide (YBCO)-based high-temperature superconductor (HTS) tapes when subject to torsion. The variation in strain at multiple points was found out by embedding FBG sensors at strategic points on the tape. Torsional tests were carried out with tapes with different configurations of sensors. Configurations included embedding the FBG sensors on the mid-rib of the tape and stacking them parallel as an array. The newly fabricated tape was subject to torsion at both room temperature and liquid nitrogen temperature, and the variation in strain was studied. Also, certain parameters like the degree of freedom of one end of the HTS tape under twist were varied. The results obtained for the free-ended tape and the fixed-ended tape showed significant differences in the type of strain experienced by the tape. When the tape was given freedom to move axially during twisting, the strain variation was uniform and high repeatability was noticed. This reflects on the importance of the condition of the ends of the tape during torsion. In this paper, the design and technology requirements to adapt the wavelength division multiplexing (WDM) FBG sensor concept that could be installed in parallel configuration for coated conductors is presented. Initial experiments, which demonstrate the torsional stress distribution at room temperature and at 77 K are reported.

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  1. Institute for Technical Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtzplatz 1, 76344, Eggenstein-Leopoldshafen, Germany

    Rajinikumar Ramalingam, R. Nast & H. Neumann

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  1. Rajinikumar Ramalingam
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  2. R. Nast
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  3. H. Neumann
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Correspondence to Rajinikumar Ramalingam.

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Ramalingam, R., Nast, R. & Neumann, H. Strain Characterization of HighTemperature Superconductor Tapes Using Embedded Fibre Bragg Grating Sensor in Mid-rip and Parallel Configuration. J Supercond Nov Magn 30, 1963–1970 (2017). https://doi.org/10.1007/s10948-016-3648-2

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  • DOI: https://doi.org/10.1007/s10948-016-3648-2

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