Remote sensing to ocean by using Brillouin scattering: Test of sound speed and submerged object

摘要

The laboratory experimental test of sound speed for fresh water and typical salt water (salinity S=35 per thousand) are reported for different water temperatures. considering that the returned signal contains both Rayleigh and Brillouin peak (which have Gaussian and Lorentzian. Then, the sound speed is obtained by Brillouin shift that is determined with FSR of the Fabry-Perot. For the testing of submerged object, it has fewer requirements on the accuracy. The experimental results without and with submerged object are given. All results show taht Brillouin scattering is a good method for measuring sound speed in water and for testing of submerged object.