Table 2: Comparison of the calculated internal force compared to the applied force.

Load (kN) BOTDA (kN) Absolut error (%) FBG (kN) Absolute error (%) 0 0 0 0 0 3.67 3.17 13.62 3.21 12.53 6.67 6.23 6.60 6.63 0.60 10 9.19 8.1 9.13 8.7 13.33 12.58 5.63 13.22 0.83 16.67 16.00 4.02 16.06 3.66 20 19.03 4.85 19.69 1.55 23.33 22.59 3.17 22.63 3.00 26.67 26.48 0.71 26.46 0.79 30 29.38 2.07 29.56 1.47