Increasing BOTDA precision using correlation image processing methods

In this work, we demonstrate improving the precision of correlation methods for Brillouin frequency shift (BFS) extraction in distributed fiber optic sensors by applying the algorithms in 2D space. The use of several spectra at once to calculate correlation functions made it possible to increase the precision of the BOTDA. The developed approaches have proven themselves to be the best when processing spectra with low frequency resolution (obtained with high frequency scan step FS).