A real-time monitoring system for comprehensive noise of underwater motion platform

Abstract

The present invention proposes a real-time monitoring system for the comprehensive noise of an underwater motion platform. The optical fiber sensor array control system generates N detection light signals of different wavelengths, and each detection light signal is respectively input into a corresponding optical fiber sensor array subsystem; the optical fiber sensor array subsystem includes M optical fiber sensor array modules, and the types of optical fiber sensors in the optical fiber sensor array modules include optical fiber vibration sensors, optical fiber hydroacoustic sensors, and optical fiber air acoustic sensors. The optical fiber sensor array modules in the optical fiber sensor array subsystem adopt a space division multiplexing method, and the optical fiber sensors in the optical fiber sensor array modules adopt a time division multiplexing method; each optical fiber sensor array subsystem outputs a light signal to be measured that carries vibration, hydroacoustic, and air acoustic parameters. The present invention can realize the real-time acquisition of the comprehensive noise parameters of a specific area at the same time and point on the underwater motion platform and the layout requirements of specific types and quantities of sensors in different usage scenarios.

Description

Technical Field

[0001] The invention mainly relates to the technical field of noise monitoring, in particular to a real-time monitoring system for comprehensive noise of an underwater motion platform. Background Art

[0002] Sound waves are the only form of energy radiation that can be transmitted over long distances in the ocean. The acoustic characteristics of underwater motion platforms determine the possibility of their discovery, tracking, and identification. The noise generated by underwater motion platforms during operation mainly includes vibration noise (generated by the main engine, auxiliary engines, various motors, reduction devices, air compressors, etc.), hydrodynamic noise (generated by the interaction between the rudder, bridge, superstructure, etc. and the water flow when the platform moves) and air noise (platform air noise, diesel engine underwater exhaust, etc.). The accumulation of these noises not only increases the risk of the platform being detected and identified, but also increases the background noise of its own detection system and reduces the ability to detect targets. In order to enhance the overall performance of the underwater motion platform, it is necessary to attach great importance to the vibration and noise control of the platform. Therefore, real-time monitoring of the comprehensive noise of the underwater motion platform is very important.

[0003] At present, traditional electrical sensors are widely used and can detect parameters such as vibration noise, hydrodynamic noise and air noise. However, they are limited by the detection principle and are difficult to form a large array. There are many restrictions on their use in special environments such as underwater motion platforms. Fiber optic sensors have unique advantages such as large-scale array and anti-electromagnetic interference, and have good application prospects. As the development trend of underwater motion platforms shifts towards large-scale and precision, multi-point measurements are required for large underwater motion platforms. Equipment at different locations and different volumes need to set measurement points according to their specific needs. At the same time, the problems of scattered measurement points and harsh measurement environment have put forward higher requirements for sensors.

[0004] The existing fiber optic sensor array system measurement scheme cannot meet the underwater motion platform's measurement requirements for vibration noise, hydrodynamic noise and air noise. For example, the patent application with publication number CN111928937A discloses a "fiber optic vibration sensor probe and fiber optic microseismic monitoring system", in which the space division multiplexing technology has a simple optical path structure, each channel is independent of each other, and there is no crosstalk, but its system cost is high and it is not suitable for large-scale multiplexing. The patent application with publication number CN114777898B discloses a symmetrical time division multiplexing structure and a high-reliability fiber optic hydrophone array system. In the time division multiplexing technology, there are constraints between the number of multiplexing units, the time delay between channels and the sampling rate of the demodulation system. The increase of multiplexing units will affect the dynamic range of the system, and the large-scale time division array system has certain difficulties in maintenance. Once damaged, the repair time is long. There are many application limitations in specific situations such as underwater motion platforms with high intensity and harsh environments. In addition, the detection of the comprehensive noise of underwater motion platforms can also be achieved by combining multiple existing array systems. However, these systems usually operate independently, which seriously limits their all-round measurement of the synchronous common points of underwater motion platforms. This limitation makes it impossible to achieve all-round dynamic integration and analysis of the comprehensive noise of underwater motion platforms.

[0005] In summary, there is still no comprehensive real-time noise monitoring system for underwater motion platforms that can meet the monitoring needs. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a real-time monitoring system for comprehensive noise of an underwater motion platform.

[0007] The technical solution adopted by the present invention is:

[0008] A comprehensive noise real-time monitoring system for an underwater motion platform, comprising a fiber optic sensor array control system and N fiber optic sensor array subsystems, where N is greater than or equal to 2;

[0009] The optical fiber sensor array control system is used to generate N detection light signals of different wavelengths, and each detection light signal of different wavelength is input into a corresponding optical fiber sensor array subsystem;

[0010] The optical fiber sensor array subsystem includes M optical fiber sensor array modules, and the optical fiber sensor array module includes P optical fiber sensors. The types of optical fiber sensors in the optical fiber sensor array module include optical fiber vibration sensors, optical fiber water acoustic sensors, and optical fiber air acoustic sensors. The optical fiber sensor array modules in the optical fiber sensor array subsystem adopt space division multiplexing, and the optical fiber sensors in the optical fiber sensor array module adopt time division multiplexing.

[0011] Each fiber optic sensor array subsystem generates and outputs a light signal to be measured that carries vibration, water sound and air sound parameters.

[0012] Furthermore, the optical fiber sensor array control system includes an optical fiber sensor array signal generating system, a first wavelength division multiplexer, an optical fiber power amplifier, and a first de-wavelength division multiplexer, and the optical fiber sensor array signal generating system is connected to the first wavelength division multiplexer, the optical fiber power amplifier, and the first de-wavelength division multiplexer in sequence.

[0013] Furthermore, the optical fiber sensor array signal generating system generates N optical signals of different wavelengths, which are coupled into a single optical fiber through a first wavelength division multiplexer, amplified by an optical fiber power amplifier, and then transmitted to a first de-wavelength division multiplexer through an optical cable, where the optical signals of different wavelengths are separated to obtain N detection optical signals of different wavelengths.

[0014] Furthermore, the optical fiber sensor array control system also includes M second wavelength division multiplexers, M optical fiber preamplifiers, M second de-wavelength division multiplexers and an optical fiber sensor array signal acquisition and processing system; the optical signal to be measured output by the m-th optical fiber sensor array module in the n-th optical fiber sensor array subsystem is sent to the m-th second wavelength division multiplexer for multiplexing, wherein n=1,2,...,N, m=1,2,...,M, the multiplexed optical signal to be measured is amplified by the m-th optical fiber preamplifier and then separated by wavelength through the m-th second de-wavelength division multiplexer, and then enters the optical fiber sensor array signal acquisition and processing system in different channels, performs signal acquisition after photoelectric conversion, and then uses phase generation carrier modulation and demodulation technology to demodulate the optical signal, thereby obtaining vibration, water sound and air sound information therein.

[0015] Furthermore, the optical fiber vibration sensor, optical fiber water acoustic sensor and optical fiber air acoustic sensor all adopt a Michelson interferometer structure.

[0016] Furthermore, the optical fiber sensor array subsystem includes an optical fiber connector, a main optical cable and M optical fiber sensor array modules. The detection optical signal input to the optical fiber sensor array subsystem is transmitted to the main optical cable through the optical fiber connector, and the detection optical signal is respectively sent to the M optical fiber sensor array modules connected to the main optical cable in a space division multiplexing manner;

[0017] The optical fiber sensor array module includes a watertight device box, an optical fiber connector, a branch optical cable and P optical fiber sensors. In each optical fiber sensor array module, the detection light signal enters the branch optical cable through the optical fiber connector, and passes through the P optical fiber sensors connected to the branch optical cable in turn in a time-division multiplexing manner to form a light signal to be measured that carries vibration, water sound and air sound parameters.

[0018] Furthermore, the main optical cable and the branch optical cable are made of multi-core flexible threaded armored cables, and the optical fiber sensor array modules connected to the main optical cable are evenly spaced, and the optical fiber sensors connected to the branch optical cables are evenly spaced.

[0019] Furthermore, the main optical cable uses a 17-core flexible threaded armored cable, and the branch optical cable uses a 2-core flexible threaded armored cable.

[0020] Furthermore, the optical fiber sensor array signal acquisition and processing system adopts phase generated carrier modulation and demodulation technology to ensure the stability of signal detection when different optical fiber sensors are mixed. The phase generated carrier modulation and demodulation technology adopts a very mature general technology in this field, such as phase generated carrier-PGC demodulation technology.

[0021] Furthermore, the optical fiber sensor array subsystem includes 10 optical fiber sensor array modules, and the optical fiber sensor array module includes 16 optical fiber sensors.

[0022] Through the above technical solution, the technical effects that the present invention can produce are:

[0023] The present invention provides a real-time monitoring system for the comprehensive noise of an underwater motion platform, which can simultaneously and continuously obtain the comprehensive noise parameters of a specific area on the underwater motion platform, has strong real-time performance and accurate positioning, and can deduce the noise distribution image and propagation characteristics of the underwater motion platform by analyzing the collected noise data, thereby providing strong data support for the structural design optimization, fine manufacturing, layout adjustment and other related technical research of the underwater motion platform, and effectively preventing potential structural failures and accidents.

[0024] The present invention uses phase-generated carrier modulation and demodulation technology to ensure the stability of signal detection when different optical fiber sensors are used in combination, meet the requirements for the layout of specific types and quantities of sensors in different usage scenarios on underwater motion platforms, while ensuring performance, achieve a more compact layout design, and improve its installation flexibility in limited space.

[0025] The present invention constructs M-way space-divided P-element time-divided optical fiber sensor array modules through hybrid multiplexing of space division and time division, forming an M×P-element optical fiber sensor array subsystem. The structural design is easy to maintain and repair. When a failure occurs, there is no need to disassemble and repair the entire system on a large scale. Only a single optical fiber sensor array module needs to be replaced, which greatly simplifies the maintenance process and improves the availability and reliability of the system. The optical fiber sensor array subsystems are combined by wavelength division multiplexing to form a large-scale optical fiber array system with N M×P-element array subsystems. Different subsystems can be enabled according to different usage scenarios to meet the application requirements in various complex environments, providing a more efficient and reliable comprehensive noise monitoring solution for underwater motion platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a real-time monitoring system for comprehensive noise of an underwater motion platform provided in an embodiment;

[0028] Figure 2 is an optical schematic diagram of a real-time monitoring system for comprehensive noise of an underwater motion platform provided in an embodiment;

[0029] Figure 3 is an optical schematic diagram of a fiber optic sensor array subsystem in one embodiment;

[0030] Figure 4 is a schematic diagram of the structure of an optical fiber sensor array subsystem in one embodiment;

[0031] Figure 5 Schematic diagram of the structure of the main optical cable in one embodiment.

[0032] Description of labels:

[0033] 1. Fiber optic sensor array control system, 2. Fiber optic sensor array subsystem, 3. Fiber optic connector, 4. Fiber optic sensor array module, 5. Main optical cable, 6. Watertight device box, 7. Fiber optic vibration sensor, 8. Fiber optic hydroacoustic sensor, 9. Fiber optic air acoustic sensor, 10. Branch optical cable;

[0034] 1-1, optical fiber sensor array signal generation system, 1-2, first wavelength division multiplexer, 1-3, optical fiber power amplifier, 1-4, first de-wavelength division multiplexer, 1-5, second wavelength division multiplexer, 1-6, optical fiber preamplifier, 1-7, second de-wavelength division multiplexer, 1-8, optical fiber sensor array signal acquisition and processing system;

[0035] 2-1, a first optical fiber sensor array subsystem, 2-2, a second optical fiber sensor array subsystem, 2-3, a third optical fiber sensor array subsystem, 2-N, an Nth optical fiber sensor array subsystem,

[0036] 4-1, a first optical fiber sensor array module, 4-2, a second optical fiber sensor array module, 4-3, a third optical fiber sensor array module, 4-M, an Mth optical fiber sensor array module;

[0037] 7-1, the first optical fiber vibration sensor, 7-2, the second optical fiber vibration sensor, 7-P, the Pth optical fiber vibration sensor. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clearly understood, the following will be used to clearly illustrate the spirit of the content disclosed by the present invention with the accompanying drawings and detailed descriptions. After understanding the embodiments of the content of the present invention, any person skilled in the art can change and modify the technology taught by the content of the present invention without departing from the spirit and scope of the content of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0039] The present invention provides a real-time monitoring system for comprehensive noise of an underwater motion platform, comprising a fiber optic sensor array control system 1, N fiber optic sensor array subsystems 2, N being greater than or equal to 2; the N fiber optic sensor array subsystems are respectively a first fiber optic sensor array subsystem 2-1, a second fiber optic sensor array subsystem 2-2, a third fiber optic sensor array subsystem 2-3, ..., an Nth fiber optic sensor array subsystem 2-N.

[0040] The optical fiber sensor array control system 1 is used to generate N detection light signals of different wavelengths, and each detection light signal of different wavelength is input into a corresponding optical fiber sensor array subsystem 2;

[0041] The optical fiber sensor array subsystem 2 includes M optical fiber sensor array modules 4, namely a first optical fiber sensor array module 4-1, a second optical fiber sensor array module 4-2, a third optical fiber sensor array module 4-3, ..., an Mth optical fiber sensor array module 4-M.

[0042] The first optical fiber sensor array module 4-1 includes P optical fiber vibration sensors 7, namely the first optical fiber vibration sensor 7-1, the second optical fiber vibration sensor 7-2, and the Pth optical fiber vibration sensor 7-P. The types of optical fiber sensors in the optical fiber sensor array module 4 include optical fiber vibration sensors 7, optical fiber water acoustic sensors 8, and optical fiber air acoustic sensors 9. The optical fiber sensor array modules 4 in the optical fiber sensor array subsystem 2 use space division multiplexing, and the optical fiber sensors in the optical fiber sensor array module 4 use time division multiplexing.

[0043] Each optical fiber sensor array subsystem 2 generates and outputs a light signal to be measured that carries vibration, water sound and air sound parameters.

[0044] The number of N and M in the present invention is not limited, and those skilled in the art can set them according to specific application requirements. The array system is scalable, and a specified number of fiber optic sensor array modules can be selected according to actual application requirements. Similarly, the number of P is also not limited, and those skilled in the art can set it according to specific application requirements. When a fiber optic sensor in a fiber optic sensor array module 4 is damaged, it is necessary to remove the entire fiber optic sensor array module 4, totaling P fiber optic sensors. Considering the maintainability of the entire array system, the number of P is usually not more than 16. A fiber optic sensor array subsystem 2 includes M×P fiber optic sensors, and the value of M×P can be 128, 256, or 512, and is designed according to actual project requirements.

[0045] The optical fiber sensor array control system 1 includes an optical fiber sensor array signal generating system 1-1, a first wavelength division multiplexer 1-2, an optical fiber power amplifier 1-3, and a first de-wavelength division multiplexer 1-4. The optical fiber sensor array signal generating system 1-1 is connected to the first wavelength division multiplexer 1-2, the optical fiber power amplifier 1-3, and the first de-wavelength division multiplexer 1-4 in sequence.

[0046] The optical fiber sensor array signal generating system 1-1 generates N optical signals of different wavelengths, which are coupled into a single optical fiber through a first wavelength division multiplexer 1-2, amplified by an optical fiber power amplifier 1-3, and then transmitted to a first demultiplexer 1-4 through an optical cable, where the optical signals of different wavelengths are separated to obtain N detection optical signals of different wavelengths.

[0047] The optical fiber sensor array control system also includes M second wavelength division multiplexers 1-5, M optical fiber preamplifiers 1-6, M second de-wavelength division multiplexers 1-7 and an optical fiber sensor array signal acquisition and processing system 1-8; the optical signal to be measured output by the m-th optical fiber sensor array module in the n-th optical fiber sensor array subsystem is sent to the m-th second wavelength division multiplexer 1-5 for multiplexing, wherein n=1,2,...,N, m=1,2,...,M, the multiplexed optical signal to be measured is amplified by the m-th optical fiber preamplifier 1-6 and then separated by wavelength through the m-th second de-wavelength division multiplexer 1-7, and then enters the optical fiber sensor array signal acquisition and processing system 1-8 in different channels, performs signal acquisition after photoelectric conversion, and then uses phase generation carrier modulation and demodulation technology to demodulate the optical signal, thereby obtaining vibration, water sound and air sound information therein.

[0048] In one embodiment, a fiber optic sensor array subsystem 2 includes 16×16 fiber optic sensors. In practical applications, according to actual needs, it can also be 8×16, 12×16, 8×18, 12×10, etc. The specific settings are combined according to actual application needs. The present invention is scalable.

[0049] The present invention can realize the real-time acquisition of the comprehensive noise parameters of a specific area and point on an underwater sports platform at the same time and the layout requirements of specific types and quantities of sensors in different usage scenarios. At the same time, the system structure design is easy to maintain and repair, meeting the application requirements in various complex environments.

[0050] Reference Figure 1 and Figure 2 One embodiment provides a large-scale optical fiber vibration, water sound and air sound sensor integrated array system, including an optical fiber sensor array control system 1, N optical fiber sensor array subsystems 2, optical fiber connectors 3, M optical fiber sensor array modules 4, main optical cables 5, watertight device boxes 6, optical fiber vibration sensors 7, optical fiber water sound sensors 8, optical fiber air sound sensors 9, and branch optical cables 10. The optical fiber sensor array control system 1 includes an optical fiber sensor array signal generation system 1-1, a first wavelength division multiplexer 1-2, an optical fiber power amplifier 1-3, a first de-wavelength division multiplexer 1-4, 16 second wavelength division multiplexers 1-5, 16 optical fiber preamplifiers 1-6, 16 second de-wavelength division multiplexers 1-7, and an optical fiber sensor array signal acquisition and processing system 1-8. The optical fiber sensor array subsystem 2 includes 16×16 optical fiber sensors. Specifically, the optical fiber sensor array subsystem 2 includes 16 optical fiber sensor array modules 4, and the optical fiber sensor array module 4 includes 16 optical fiber sensors.

[0051] The N optical fiber sensor array subsystems 2 are respectively a first optical fiber sensor array subsystem 2-1, a second optical fiber sensor array subsystem 2-2, ..., an Nth optical fiber sensor array subsystem 2-N.

[0052] The M optical fiber sensor array modules 4 are respectively a first optical fiber sensor array module 4-1, a second optical fiber sensor array module 4-2, a third optical fiber sensor array module 4-3, ..., an Mth optical fiber sensor array module 4-M.

[0053] In the optical fiber sensor array control system 1, the optical fiber sensor array signal generating system 1-1 is connected to the first wavelength division multiplexer 1-2, the optical fiber power amplifier 1-3, and the first de-wavelength division multiplexer 1-4 in sequence, and the second wavelength division multiplexer 1-5 is connected to the optical fiber preamplifier 1-6, the second de-wavelength division multiplexer 1-7, and the optical fiber sensor array signal acquisition and processing system 1-8 in sequence;

[0054] The first de-wavelength division multiplexer 1-4 and the second wavelength division multiplexer 1-5 in the optical fiber sensor array control system 1 are connected to N optical fiber sensor array subsystems 2;

[0055] The optical fiber connector 3 in the optical fiber sensor array subsystem 2 is connected to the main optical cable and 16 optical fiber sensor array modules 4;

[0056] The watertight device box 6 in the optical fiber sensor array module 4 is connected to the optical fiber connector 3, the branch optical cable 10 and the 16 optical fiber sensors;

[0057] The optical fiber vibration sensor 7, the optical fiber water sound sensor 8 and the optical fiber air sound sensor 9 among the 16 optical fiber sensors are connected in any combination.

[0058] The optical fiber sensor array control system 1 uses wavelength division multiplexing to combine multiple optical fiber sensor array subsystems 2 to form a large-scale optical fiber vibration, water acoustic and air acoustic sensor integrated array system, wherein the optical fiber sensor array signal generation system 1-1 provides N detection optical signals of different wavelengths, which are coupled to a single optical fiber through the first wavelength division multiplexer 1-2. After the optical power is increased to a sufficiently large level by the optical fiber power amplifier 1-3, the optical signals are transmitted to the first de-wavelength division multiplexer 1-4 through the optical cable to separate the detection optical signals of different wavelengths. Each wavelength corresponds to an optical fiber sensor array subsystem 2, and then transmitted to the main optical cable through the optical fiber connector 3. The detection optical signals are sent to 16 optical fiber sensor array modules respectively by space division multiplexing. 4; In each fiber optic sensor array module 4, the detection optical signal enters the branch optical cable 10 through the watertight device box 6 and the optical fiber connector 3, and passes through 16 optical fiber sensors in turn in a time division multiplexing manner to form a light signal to be measured that carries vibration, water sound and air sound parameters. The light signal to be measured is sent to the second wavelength division multiplexer 1-5 for wave combination, amplified by the optical fiber preamplifier 1-6, and then separated by the second wavelength division multiplexer 1-7. The optical signal of each channel enters the optical fiber sensor array signal acquisition and processing system 1-8, and is acquired after photoelectric conversion. Then, the optical signal is demodulated using the phase generation carrier modulation and demodulation technology, so as to obtain the vibration, water sound and air sound information of the underwater motion platform.

[0059] In the above-mentioned embodiment, the optical fiber vibration sensor 7, the optical fiber hydroacoustic sensor 8 and the optical fiber air acoustic sensor 9 all adopt a Michelson interferometer structure, so that one detection system can realize signal acquisition of these three sensors. At the same time, a phase-generated carrier modulation and demodulation technology that is independent of the modulation parameters is adopted to ensure the stability of signal detection when different optical fiber sensors are used in combination, meet the requirements for the layout of specific types and quantities of sensors in different usage scenarios on the underwater motion platform, and reduce the occupied area of ​​the system.

[0060] In the above embodiment, a single optical fiber sensor array module 4 is formed by 16-way time division, and then combined with 16-way space division to form an optical fiber sensor array subsystem 2. This structural design is easy to maintain and repair. When a failure occurs, only a single optical fiber sensor array module 4 needs to be replaced, which shortens the maintenance time and improves the availability and reliability of the system.

[0061] The optical fiber sensor array subsystems 2 are combined into a large-scale optical fiber array system through wavelength division multiplexing, and different subsystems can be enabled according to different usage scenarios to meet application requirements in various complex environments.

[0062] Another embodiment provides a large-scale integrated array system of optical fiber vibration, hydroacoustic and air acoustic sensors, which differs from the above-mentioned embodiment in that the integrated array system includes a first optical fiber sensor array subsystem 2-1, a second optical fiber sensor array subsystem 2-2, and an Nth optical fiber sensor array subsystem 2-N. The optical fiber sensor array control system 1 uses wavelength division multiplexing to combine multiple optical fiber sensor array subsystems 2 into a large-scale optical fiber array system, and different subsystems can be enabled according to different usage scenarios to meet application requirements in various complex environments.

[0063] like Figure 3 As shown, the fiber optic sensor array subsystem 2 includes 16 fiber optic sensor array modules 4, and the fiber optic sensor array modules 4 use space division multiplexing. The fiber optic sensor array module 4 contains 16 fiber optic sensors, and the fiber optic sensors use time division multiplexing. This structural design is convenient for maintenance and repair. When a fault occurs, only a single fiber optic sensor array module needs to be replaced, which shortens the maintenance time and improves the availability and reliability of the system.

[0064] The optical fiber vibration sensor 7, the optical fiber hydroacoustic sensor 8 and the optical fiber air acoustic sensor 9 all adopt a Michelson interferometer structure, so that one detection system can realize signal acquisition of these three sensors. In the optical fiber sensor array module 4, the layout requirements of specific types and quantities of sensors can be customized according to different usage scenarios on the underwater motion platform, which simplifies the difficulty of sensor layout and reduces the area occupied by the system.

[0065] Another embodiment provides a large-scale integrated array system of optical fiber vibration, hydroacoustic and air acoustic sensors, which differs from the above-mentioned embodiment in that the optical fiber sensor array signal acquisition and processing system 1-8 adopts a phase-generated carrier modulation and demodulation technology that is independent of the modulation parameters to ensure the stability of signal detection when different optical fiber sensors are used in combination.

[0066] like Figure 4 , Figure 5As shown, the main optical cable 5 uses a multi-core flexible threaded armored cable, and the actual use spacing of the optical fiber sensor array module 4 can be adjusted according to the use requirements.

[0067] The branch optical cable 10 uses a 2-core flexible threaded armored cable, and the actual use spacing of the optical fiber sensor can be adjusted according to the use requirements.

[0068] Another embodiment provides a large-scale integrated array system of optical fiber vibration, hydroacoustic and air acoustic sensors, which differs from the above embodiment in that the optical fiber sensor array subsystem 2 includes 8 optical fiber sensor array modules, and the optical fiber sensor array modules 4 use space division multiplexing. The optical fiber sensor array module 4 contains 32 optical fiber sensors, and the optical fiber sensors use time division multiplexing.

[0069] Another embodiment provides a large-scale integrated array system of optical fiber vibration, hydroacoustic and air acoustic sensors, which differs from the above-mentioned embodiment in that the optical fiber sensor array module 4 includes 5 optical fiber vibration sensors 7, 5 optical fiber hydroacoustic sensors 8 and 6 optical fiber air acoustic sensors 9.

[0070] Another embodiment provides a large-scale integrated array system of optical fiber vibration, hydroacoustic and air acoustic sensors, which differs from the above embodiment in that the main optical cable 5 uses a 17-core flexible threaded armored cable, and the actual use spacing of the optical fiber sensor array module is 5 meters; the branch optical cable 10 uses a 2-core flexible threaded armored cable, and the actual use spacing of the optical fiber sensor is 1 meter.

[0071] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A real-time monitoring system for comprehensive noise of underwater motion platforms. It is characterized in that It includes a fiber optic sensor array control system, N fiber optic sensor array subsystems, fiber optic connectors, M fiber optic sensor array modules, main optical cables, watertight device boxes, fiber optic vibration sensors, fiber optic hydroacoustic sensors, fiber optic air acoustic sensors, and branch optical cables; The optical fiber sensor array control system includes an optical fiber sensor array signal generating system, a first wavelength division multiplexer, an optical fiber power amplifier, a first de-wavelength division multiplexer, M second wavelength division multiplexers, M optical fiber preamplifiers, M second de-wavelength division multiplexers and an optical fiber sensor array signal acquisition and processing system, where N is greater than or equal to 2; The N optical fiber sensor array subsystems are respectively a first optical fiber sensor array subsystem, a second optical fiber sensor array subsystem, ..., an Nth optical fiber sensor array subsystem; The M optical fiber sensor array modules are respectively a first optical fiber sensor array module, a second optical fiber sensor array module, a third optical fiber sensor array module, ..., an Mth optical fiber sensor array module; The optical fiber sensor array control system is used to generate N detection optical signals of different wavelengths, and each detection optical signal of different wavelengths is input into a corresponding optical fiber sensor array subsystem; the optical fiber sensor array signal generation system is connected with the first wavelength division multiplexer, the optical fiber power amplifier, and the first de-wavelength division multiplexer in sequence; the second wavelength division multiplexer is connected with the optical fiber preamplifier, the second de-wavelength division multiplexer, and the optical fiber sensor array signal acquisition and processing system in sequence; The optical fiber sensor array signal generation system generates N optical signals of different wavelengths, which are coupled to a single optical fiber through a first wavelength division multiplexer, amplified by an optical fiber power amplifier, and then transmitted to a first demultiplexer through an optical cable, where the optical signals of different wavelengths are separated to obtain N detection optical signals of different wavelengths; The optical fiber sensor array subsystem includes an optical fiber connector, a main optical cable and M optical fiber sensor array modules. The detection optical signal input to the optical fiber sensor array subsystem is transmitted to the main optical cable through the optical fiber connector, and the detection optical signal is respectively sent to the M optical fiber sensor array modules connected to the main optical cable in a space division multiplexing manner. The optical fiber sensor array module includes a watertight device box, an optical fiber connector, a branch optical cable and P optical fiber sensors. The types of optical fiber sensors in the optical fiber sensor array module include optical fiber vibration sensors, optical fiber water acoustic sensors and optical fiber air acoustic sensors. The optical fiber sensor array modules in the optical fiber sensor array subsystem adopt a space division multiplexing manner, and the optical fiber sensors in the optical fiber sensor array module adopt a time division multiplexing manner; the optical fiber vibration sensor, the optical fiber water acoustic sensor and the optical fiber air acoustic sensor all adopt a Michelson interferometer structure; in each optical fiber sensor array module, the detection optical signal enters the branch optical cable through the watertight device box and the optical fiber connector, and passes through the P optical fiber sensors connected to the branch optical cable in turn in a time division multiplexing manner, and is evenly spaced between the optical fiber sensor array modules connected to the main optical cable, and is evenly spaced between the optical fiber sensors connected to the branch optical cable; The optical signal to be measured output by the mth optical fiber sensor array module in the nth optical fiber sensor array subsystem is sent to the mth second wavelength division multiplexer for wave combining, wherein n=1,2,...,N, m=1,2,...,M. The wave combined optical signal to be measured is amplified by the mth optical fiber preamplifier and then separated by wavelength through the mth second demultiplexer. Then, it enters the optical fiber sensor array signal acquisition and processing system in different channels. After the photoelectric conversion, the signal is collected. Then, the phase generation carrier modulation and demodulation technology is used to demodulate the optical signal, thereby obtaining the vibration, water sound and air sound information therein.

2. According to claim 1, a real-time monitoring system for comprehensive noise of an underwater sports platform, It is characterized in that The main optical cable and branch optical cable are made of multi-core flexible threaded armored cables.

3. A real-time monitoring system for comprehensive noise of an underwater sports platform according to claim 2, It is characterized in that The main optical cable uses 17-core flexible threaded armored cable, and the branch optical cable uses 2-core flexible threaded armored cable.

4. A real-time monitoring system for comprehensive noise of an underwater sports platform according to any one of claims 1 to 3, It is characterized in that The optical fiber sensor array signal acquisition and processing system adopts phase generation carrier modulation and demodulation technology to ensure the stability of signal detection when different optical fiber sensors are used in combination.

5. A real-time monitoring system for comprehensive noise of an underwater sports platform according to claim 4, It is characterized in that The optical fiber sensor array subsystem includes 10 optical fiber sensor array modules, and the optical fiber sensor array modules include 16 optical fiber sensors.

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