Underwater security blocking net system with invading target positioning function and use method of underwater security blocking net system

Abstract

The invention discloses an underwater security blocking net system with an invading target positioning function and a use method of the underwater security blocking net system. An optical cable is used as a sensing and transmission two-in-one device, and various disturbances transmitted to the optical cable by an underwater protection net are used for continuously monitoring the periphery of the optical cable in real time; the disturbance data is analyzed, processed and intelligently identified through the rear end, different interference types are judged, and system early warning or real-time warning is realized, so that the threat behaviors of the intrusion perimeter, such as water flow disturbance caused by collision of an intrusion object, cutting of the blocking net and approaching of the intrusion object to the blocking net, are achieved; the underwater security blocking net system is convenient to install and debug, low in maintenance cost, high in electromagnetic interference resistance and high in automation degree, and all-directional, all-weather and all-time intrusion monitoring is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater blocking, and in particular relates to an underwater security blocking net system with an intrusion target positioning function and a use method thereof. Background Art

[0002] Fisheries or oil facilities located in oceans, lakes and other areas are of great significance for protection, and the location of the protected targets is relatively fixed, with many key locations and a wide range of areas. Currently, they are mostly protected by underwater protection nets, but invading targets can reduce the protection capabilities of the protection nets by destroying them. However, traditional protection nets do not have the function of detecting and locating invading targets. In view of this, how to develop an underwater security barrier net system that can identify the interference state of underwater protection nets and accurately locate invading targets is an urgent problem to be solved. Summary of the invention

[0003] The present invention provides an underwater security barrier net system with an intrusion target positioning function and a use method thereof, so as to solve the problems existing in the prior art.

[0004] To solve the above problems, the technical solution provided by the present invention is as follows:

[0005] An embodiment of the present invention provides an underwater security barrier net system with an intrusion target positioning function, comprising a demodulation system (1), an optical cable (2), an underwater security barrier net (3), an anchor chain (4) and a floating ball (5); the demodulation system (1) is arranged on the end of the optical cable (2); the optical cable (2) is fixed on the underwater security barrier net (3) in a preset shape; the side of the underwater security barrier net (3) is connected to the anchor chain (4); the top of the anchor chain (4) is connected to the floating ball (5); strong magnetic rings (6) are arranged at intervals on the optical cable (2); the optical cable (2) is a sensor device selected from distributed acoustic sensing DAS, weak reflection fiber grating array interference sensing and weak reflection fiber grating array split sensing;

[0006] When an invading object collides with or cuts the underwater security barrier net (3), the water flow fluctuation caused by the invading object approaching the underwater security barrier net (3) disturbs the underwater security barrier net or the magnetic target approaches so that the strong magnetic ring (6) adsorbs the invading object. The underwater security barrier net (3) is deformed by force, causing the state of the optical cable (2) to change. The demodulation system (1) quantitatively analyzes the invading behavior by analyzing and judging the degree of change of the light phase or grating wavelength in the optical cable (2), and locates the invading behavior through the time difference between emitting detection light and receiving the interference light intensity change signal.

[0007] In a preferred embodiment of the present invention, the mesh of the underwater security barrier net (3) is rectangular or circular.

[0008] In a preferred embodiment of the present invention, fixing devices are arranged on both sides of the underwater security barrier net (3), and the anchor chain (4) is fixed on the fixing devices.

[0009] In a preferred embodiment of the present invention, the strong magnetic ring (6) is a ring-shaped structure and is sleeved on the axial direction of the optical cable (2).

[0010] In a preferred embodiment of the present invention, the demodulation system (1) is a shore-based demodulation system or a water-based demodulation system.

[0011] The embodiment of the present invention provides a method for using an underwater security barrier net system with an intrusion target positioning function, comprising the following steps:

[0012] Step 1, before the underwater security barrier net (3) is laid in water, the optical cable (2) is fixed on the underwater security barrier net (3);

[0013] Step 2, after the underwater security barrier net (3) is launched into the water, the lower end of the underwater security barrier net (3) is fixed in relative position by a counterweight unit, and the lower end of the underwater security barrier net (3) is fixed to the seabed;

[0014] Step 3, both sides of the underwater security barrier net (3) can be connected to the anchor chain 4 through a fixing device, and the anchor chain (4) is connected to the buoy (5), and the upper end of the underwater security barrier net (3) is flush with the sea surface;

[0015] Step 4, demodulation system (1) connection method: the demodulation system (1) can be divided into two types according to the deployment location: a shore-based demodulation system and a surface demodulation system. One end of the optical cable (2) is connected to the demodulation system (1). If a surface demodulation system is used, the demodulation signal can be transmitted to the shore-based control center via a wireless signal.

[0016] Beneficial effect: The embodiment of the present invention provides an underwater security barrier net system with an intrusion target positioning function and a method of using the system. The present invention uses the optical cable as a two-in-one sensor and transmission device, and utilizes the various disturbances transmitted to the optical cable by the underwater protection net to continuously and in real time monitor the periphery of the optical cable. The back-end analyzes and processes the disturbance data and intelligently identifies them to determine different types of interference, thereby achieving system early warning or real-time alarm, thereby achieving the purpose of monitoring threatening behaviors that invade the perimeter, such as: intruding objects colliding with, cutting the barrier net, and intruding objects approaching the barrier net, causing water disturbances. The underwater security barrier net system is easy to install and debug, has low maintenance cost, strong resistance to electromagnetic interference, and a high degree of automation, thereby achieving all-round, all-weather, and all-time intrusion monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments or 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A front view of an underwater security barrier net system with an intrusion target positioning function provided in an embodiment of the present application.

[0019] Figure 2 A schematic diagram of a magnetic ring mounted on an optical cable of an underwater security barrier net system with an intrusion target locating function provided in an embodiment of the present application.

[0020] Figure numerals: demodulation system 1, optical cable 2, underwater security barrier net 3, anchor chain 4, buoy 5, strong magnetic ring 6. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0022] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an underwater security barrier net system with an intrusion target positioning function, including a demodulation system 1, an optical cable 2, an underwater security barrier net 3, an anchor chain 4 and a buoy 5. The demodulation system 1 is arranged on the end of the optical cable 2, and the optical cable 2 is fixed on the underwater security barrier net 3 in an S-shaped manner with a spacing of 10 meters. The side of the underwater security barrier net 3 is connected to the anchor chain 4, and the top of the anchor chain 4 is connected to the buoy 5; strong magnetic rings 6 are arranged at intervals on the optical cable 2. The optical cable 2 is a sensor device in distributed acoustic sensing DAS, weak reflection fiber grating array interference sensing and weak reflection fiber grating array split sensing.

[0023] When an invading object collides with or cuts the underwater security barrier net 3, the water flow fluctuation caused by the invading object approaching the underwater security barrier net 3 disturbs the underwater security barrier net or the magnetic target approaches, causing the strong magnetic ring 6 to adsorb the invading object. The underwater security barrier net 3 will be deformed by force, causing the state of the optical cable 2 to change. The demodulation system 1 quantitatively analyzes the intrusion behavior by analyzing and judging the degree of change of the light phase or grating wavelength in the optical cable 2, and locates the intrusion behavior through the time difference from emitting the detection light to receiving the interference light intensity change signal.

[0024] The mesh of the underwater security barrier net 3 is rectangular or circular. Fixing devices are arranged on both sides of the underwater security barrier net 3, and the anchor chain 4 is fixed on the fixing devices. The strong magnetic ring 6 is an annular structure, which is sleeved on the axial direction of the optical cable 2. The demodulation system 1 is a shore-based demodulation system or a surface demodulation system.

[0025] If the sensing fiber of the distributed acoustic sensing DAS is affected by intrusion (pressure, vibration, etc.), the refractive index of the light in the sensing fiber core, the length of the fiber, and the size of the fiber core diameter will change to a certain extent. This change will cause the phase of the coherent light signal generated by the light source to change to a certain extent when passing through, thereby changing the phase of the Rayleigh scattered signal in the fiber. Distributed acoustic sensing DAS achieves quantitative perception of intrusion by monitoring the phase change of backward Rayleigh scattered light. Since Rayleigh scattered light at different locations can be distinguished by the time it is reflected back to the optical fiber transmitting end, the intrusion can be located based on the arrival time of the Rayleigh scattered light.

[0026] In the weak reflection fiber grating array interferometric sensing system, the interferometric sensing optical path is essentially double-beam interference. During the transmission process, the laser will form a pulse train after being reflected by the weak reflection grating array. In systems with different designs, the pulse train interferes with the reference light generated by the laser or the front and rear pulse trains perform zero-difference interference. When the sensing optical fiber receives the intrusion behavior, the length of the sensing part fiber and the refractive index of the fiber change, so that the optical path difference of the detection light reflected by the fiber grating array in the sensing part changes, thereby causing the change of the interference phase, which is then converted into the fluctuation of the interference light intensity. The demodulation system quantitatively analyzes the intrusion behavior by demodulating the degree of phase change, and locates the intrusion behavior by the time difference between emitting the detection light and receiving the interference light intensity change signal.

[0027] In the weak reflection fiber grating array split-type sensing, the Bragg grating structure in the optical fiber is used to realize frequency-selective reflection of light waves. When the light wave propagates in the optical fiber, it encounters the Bragg grating structure, and the specific wavelength light wave that meets the Bragg condition will be reflected back, while the light waves of other wavelengths continue to transmit forward. The grating pitch of the fiber grating will change with the changes in the external environment, causing the wavelength of the reflected light to change. The weak reflection fiber grating array split-type sensing system is usually composed of multiple fiber grating sensors, which are arranged at a certain interval on the optical fiber to form a sensor array. Each fiber grating sensor acts as an independent sensing unit to measure the physical quantity at its location. Since the position of each sensor is known, the position of each measurement point can be accurately determined.

[0028] And because different intrusion behaviors cause different changes in the optical cable, distributed acoustic sensing DAS, weak reflection fiber grating array interferometric sensing and weak reflection fiber grating array split sensing can determine the type of intrusion behavior and monitor and alarm the threatening behavior that invades the perimeter.

[0029] The embodiment of the present invention also provides a method for using an underwater security barrier net system with an intrusion target positioning function, comprising the following steps:

[0030] Step 1: Before the underwater security barrier net 3 is laid in water, the optical cable 2 is fixed on the underwater security barrier net 3.

[0031] Step 2, after the underwater security barrier net 3 is launched into the water, the lower end of the underwater security barrier net 3 is fixed in relative position through a counterweight unit, and the lower end of the underwater security barrier net 3 is fixed to the seabed; other methods can also be used in other embodiments, which are not limited here.

[0032] Step 3, both sides of the underwater security barrier net 3 can be connected to the anchor chain 4 through a fixing device, the anchor chain 4 is connected to the buoy 5, and the upper end of the underwater security barrier net 3 is flush with the sea surface.

[0033] Step 4, connection method of demodulation system 1: The demodulation system 1 can be divided into two types: shore-based demodulation system and surface demodulation system according to the deployment location. One end of the optical cable 2 is connected to the demodulation system 1; if the surface demodulation system is used, the demodulation signal can be transmitted to the shore-based control center via wireless signals.

[0034] Although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An underwater security barrier net system with intrusion target positioning function, characterized in that: The invention comprises a demodulation system (1), an optical cable (2), an underwater security barrier net (3), an anchor chain (4) and a floating ball (5); the demodulation system (1) is arranged on the end of the optical cable (2); the optical cable (2) is fixed on the underwater security barrier net (3) in a preset shape; the side of the underwater security barrier net (3) is connected to the anchor chain (4); the top of the anchor chain (4) is connected to the floating ball (5); strong magnetic rings (6) are arranged at intervals on the optical cable (2); the optical cable (2) is a sensor device selected from distributed acoustic sensing DAS, weak reflection fiber grating array interference sensing and weak reflection fiber grating array split sensing; When an invading object collides with or cuts the underwater security barrier net (3), the water flow fluctuation caused by the invading object approaching the underwater security barrier net (3) disturbs the underwater security barrier net or the magnetic target approaches so that the strong magnetic ring (6) adsorbs the invading object. The underwater security barrier net (3) is deformed by force, causing the state of the optical cable (2) to change. The demodulation system (1) quantitatively analyzes the invading behavior by analyzing and judging the degree of change of the light phase or grating wavelength in the optical cable (2), and locates the invading behavior through the time difference between emitting detection light and receiving the interference light intensity change signal.

2. The underwater security barrier net with intrusion target positioning function according to claim 1 is characterized in that: The mesh of the underwater security barrier net (3) is rectangular or circular.

3. The underwater security barrier net with intrusion target positioning function according to claim 1 is characterized in that: Fixing devices are arranged on both sides of the underwater security barrier net (3), and the anchor chain (4) is fixed on the fixing devices.

4. The underwater security barrier net with intrusion target positioning function according to claim 1 is characterized in that: The strong magnetic ring (6) is a ring-shaped structure and is sleeved on the axial direction of the optical cable (2).

5. The underwater security barrier net with intrusion target positioning function according to claim 1 is characterized in that: The demodulation system (1) is a shore-based demodulation system or a water-surface demodulation system.

6. A method for using an underwater security barrier net system with an intrusion target positioning function, characterized in that: The following steps are involved: Step 1, before the underwater security barrier net (3) is laid in water, the optical cable (2) is fixed on the underwater security barrier net (3); Step 2, after the underwater security barrier net (3) is launched into the water, the lower end of the underwater security barrier net (3) is fixed in relative position by a counterweight unit, so that the lower end of the underwater security barrier net (3) is fixed to the bottom of the water; Step 3, both sides of the underwater security barrier net (3) can be connected to the anchor chain 4 through a fixing device, and the anchor chain (4) is connected to the buoy (5), and the upper end of the underwater security barrier net (3) is flush with the sea surface; Step 4, connection method of the demodulation system (1): the demodulation system (1) can be divided into two types according to the deployment location: a shore-based demodulation system and a surface demodulation system. One end of the optical cable (2) is connected to the demodulation system (1); If a surface demodulation system is used, the demodulated signal can be transmitted to the shore-based control center via wireless signals.

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