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Fiber bragg grating-based system for 2-D analysis of vibrational modes of a steel propeller blade

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Figure

Fig. 1. Two elements of a plate undergone a twisting motion (θ, twist angle) along z axis
Fig. 2. Schematic of the instrumented model steel plate as used for the optical sensor vibrational analysis using a fibre Bragg grating grid (a: top side, b: bottom side)
Fig. 3. (a) Example time domain signal of 5 FBGs along the same fibre. (b) Corresponding FFT  spectra of the transient signal shown in (a)
Fig. 2(b) were used to determine the strain magnitude and direction of bending along the x-axis which was monitored

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