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Experimental study of the test system for HTS Bi2223/Ag tapes under tension

A test system of fiber optic displacement sensor (FODS) was developed and applied to measure Ag clad multi-core (formula available in paper) (Bi2223/Ag) superconductor tape at liquid nitrogen temperature (77K). A method intensity compensation was used to eliminate the fluctuation in light source and fiber attenuation. The sensor's transmission characteristics and calibration function were obtained at 77K. The stress-strain curve of the multi-core Bi2223/Ag tape was presented, and its stress-Jc relationship provided a useful reference to the application of the tape. The obtained result reveal that: (1) this sensor system can normally work at 77K; (2) its linear operating range is up to 1.6mm; (3) multi-core Bi2223/Ag tape's stress-stain relationship and stress-Jc relationship can be measured real time; and (4) it overcomes the weaknesses that cryogenic strain gauges can only measure the surface deformation of these kinds of composite tapes.