Strain calibration of optical FBG-based strain sensors
J. Roths, A. Wilfert, P. Kratzer, F. Jülich, R. Kuttler, Munich University of Applied Sciences (Germany)
A facility for strain sensitivity calibration of optical FBG-based strain sensors according to the German VDI/VDE 2660 guideline was established and characterized. Statistical analysis of several calibration measurement series performed with one single type of FBG strain sensor and application technique showed a reproducibility of 0.15%. Strain sensitivities for FBGs inscribed in two different types of optical fibres (GF1B and PR2008) showed significantly different strain sensitivities of k = 0.7885±0.0026 and k = 0.7758±0.0024, respectively.
