Brillouin shift and linewidth measurement based on double-edge detection technology in seawater

The seawater salinity and temperature of an ocean are key parameters required for environmental evaluation, with Raman and Brillouin scattering techniques offering a potentially accurate approach. A method for Brillouin scattering spectrum measurement based on a double-edge technique is proposed, and a retrieval model for simultaneously acquiring Brillouin shifts and linewidths is built. The accuracy of the proposed retrieval model is analyzed using simulations, and the results show that this double-edge technique provides good performance in terms of Brillouin scattering spectrum reconstitution and is a feasible method for simultaneous seawater temperature and salinity inversion.