Device and method for simultaneously picking up self-vibration signals of underwater platform and external sound signals

Abstract

The invention relates to the technical field of optical fiber sensing and ocean, in particular to a device and method for simultaneously picking up self-vibration signals of an underwater platform and external sound signals, and the device comprises a light source light transmitting module, a link module, a sensing module and a modulation-demodulation module; picking of the self-vibration signals of the underwater platform and the external sound signals is integrated into a set of optical fiber phase type sensing device, and through installation design and an anti-interference signal extraction method, link optical fibers are ingeniously utilized to load platform self-vibration signals, so that the problem that a plurality of sensors are needed for sensing a plurality of parameters is solved; and meanwhile, the two signals are extracted by adopting an optical coherence detection mode, so that the device has the advantages of high sensitivity, small size, light weight, electromagnetic interference resistance and the like, and has good adaptability to a miniaturized underwater platform.

Description

technical field [0001] The invention relates to the fields of optical fiber sensing and marine technology, and relates to a device and method for simultaneously picking up self-vibration and external acoustic signals of an underwater platform. Background technique [0002] Underwater, many platforms, such as submarines, underwater unmanned submersibles, etc., need to install various types of sensor loads to meet their own information acquisition needs. At the same time, information such as deformation of their own structures and vibration during navigation also requires Synchronous monitoring. Sensing loads and state self-monitoring loads are two basic load configurations for underwater platforms. [0003] In order to meet the pickup requirements of these two signals, it is common practice to add different types of sensors according to the acquisition requirements of sensing information. For example, a vibration sensor is installed on the shell of the underwater platform t...

AI Technical Summary

Problems solved by technology

While this method brings high sensitivity, it will also make the system vulnerable to external disturbances, which will cause interference signals or increase the noise floor.

When different types of signals are aliased and applied to one sensor, it is often impossible to achieve the purpose of picking up multiple signals at the same time, but it will cause the original sensing signal extraction to be interfered or even cause errors.

In addition, because the optical fiber phase detection system must include complex light source light modulation modules, signal receiving and demodulating modules, etc., different types of sensing systems have different requirements for modulation methods and signal acquisition and demodulation methods. One of the root causes of the difficulty in integrating systems for dynamic signal sensing

Based on the above reasons, the integration of dynamic signal sensing loads of underwater platforms has always been a difficult problem in this field, and it is also a bottleneck that limits the improvement of underwater platform load capacity.

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