The invention provides an
underwater acoustic
signal real-time extraction method based on the
laser orthogonal polarization interference technology, relating to the
underwater acoustic
signal real-time extraction method based on the
laser orthogonal polarization interference technology. An existing method lacks flexibility, the detection of an
underwater wide range moving sound source can not be satisfied, only the detection of the static characteristic of an underwater sound source can be carried out, the real-time extraction of an underwater sound
signal can not be realized, and the above problems are solved by the method of the invention. A passive homodyne interferometer
system is constructed; an initial coordinate
system is established; a
laser outputs a single-frequency laser beam to go through a collimating lens and a
polarizer to be
linearly polarized light, a 45-degree angle is formed by the vibration direction of the
linearly polarized light and an X axis, the
linearly polarized light goes through a polarized
beam splitting prism 1 to be splitted into two beams of polarized light whose vibration directions are perpendicular to each other, and the polarized light is marked as S light and P light; the S light is reflected by the polarized
beam splitting prism 1 as reference light, P light is used as detection light, photodetectors detect signals, and the phases of the detected signals are obtained by using a
demodulation way. The method is applied to the field of underwater signals.