A laser underwater soundprint optical fiber detection method

Abstract

The invention discloses a laser underwater soundprint optical fiber detection method. The laser signal sent by the laser generator is divided into two signals by a beam splitter, including a reference laser and a detection laser; The reflected laser light is generated after the nano signal, and the reflected laser light is divided into multiple channels through the interconnected polarizer, fiber focusing lens, and power splitter in turn, and the multiple reflected laser light enters multiple optical path difference fibers respectively; the reference laser passes through multiple laser beams The fiber coupler couples the reflected laser light in each optical path difference fiber and sends it to multiple photoelectric phase detectors; through the analysis of the coupling signal, the phase signal and amplitude of the acoustic wave are obtained, and according to the phase difference of the multi-channel optical fiber , collect sonar signals for a complete period of time, and calculate the target position through the phase difference of different reflected laser signals, so as to realize the sound source localization function. The invention has high detection precision, takes up little space, and has no influence on the mobility of the carrying platform.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic wave detection, in particular to a laser underwater soundprint optical fiber detection method. Background technique [0002] At present, underwater detection generally uses towed sonar, which is generally 1-2 kilometers long, and penetrates into water about 500 meters obliquely downward to avoid the restrictions of thermocline and halocline. However, its matrix, tow cables and retractable devices take up a lot of space on the carrier platform; when the towed body is put into the water to work, it has a certain impact on the maneuverability of the carrier platform. Most underwater detection is performed by analyzing the signal source on the water surface, but there are many signal sources on the water surface, and the signals collected through single-point signal acquisition and analysis are messy and have low accuracy. Contents of the invention [0003] The technical problem to be s...

AI Technical Summary

Problems solved by technology

However, its base array, tow cables and retractable devices occupy a large space on the carrier platform; when the towing body is put into the water to work, it will have a certain impact on the maneuverability of the carrier platform

Most underwater detection is carried out by analyzing the signal source on the water surface, but there are many signal sources on the water surface, and the signals collected through single-point signal acquisition and analysis are messy and have low accuracy

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