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This paper discusses the use of wavelength division multiplexed fibre Bragg gratings for structural shape sensing and vibrational mode analysis. The gratings are surface attached to a cantilever beam and demodulated by a scanning fibre Fabry - Pérot filter to obtain strain information at different locations along the structure. Two demodulation schemes are used, namely a single-sensor locked mode interrogation technique which permits vibrational analysis and a scanning multi-sensor approach for beam shape determination. Static beam deformation prediction is performed using a Rayleigh - Ritz type analysis with three optimized trial functions and the strain information obtained from the fibre Bragg grating sensors. The strain information is read into a PC which performs the shape modelling of the beam.
Davis et al. (Sun,) studied this question.