Frequency Extraction of Dual Underwater Acoustic Signals Based on Laser Interferometry

With the development of economy and military technology, exploitation of marine resources and construction of underwater projects are widely concerned, which make identification technology of underwater targets become a popular issue. Based on laser interferometry, this paper proposed a method of extracting frequencies for dual underwater acoustic signals. An experimental platform was set up in the optical darkroom, a series of experiments were made subsequently. Experiments show that the repeatability of extraction of frequency of dual underwater acoustic signals was less than 1Hz.