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Cartoon illustrating the different OFDR steps for a single sensor along the fiber’s length. Steps are (a) signal in the spectral domain, (b) signal in the spatial domain, (c) gauge length window in the spectral domain, (d) cross-correlation with the reference, (e) cross-correlation result and (f) spectral shift along the fiber’s length. Steps (c) to (f) are repeated for every sensing point along the sensing region
