Monitoring method and device of submarine cable monitoring system
1. A method of monitoring a submarine cable monitoring system, comprising the steps of:
performing grid division on a submarine cable region, wherein the grid division principle is that the density of grid division is high frequently in the process of ship to ship, an infrared high-definition camera is distributed in the center of each grid, and a vibration threshold value is set;
arranging two optical fibers in each submarine cable, and calibrating the optical fibers;
arranging an induction device at the end part of each optical fiber;
the two optical fibers in one submarine cable are respectively provided with a first light source and a second light source, the first light source is sequentially connected with a first coupler, an electro-optic modulator, a first optical fiber amplifier, a photoelectric detector, a first optical switch and the optical fibers, the second light source is sequentially connected with a second coupler, a polarization controller, an adjustable optical fiber attenuator, an optical isolation module, a second optical switch and the optical fibers, the first coupler and the second coupler are respectively connected with a third coupler, the third coupler is connected with a frequency meter, and the first optical switch and the second optical switch are respectively connected with an optical time domain reflectometer;
the sensing device is connected with the controller, the controller is connected with the alarm module, the controller controls the first light source and the second light source to emit laser, and the two optical fibers output the first laser and the second laser;
demodulating, narrow-band fast Fourier transforming, drying removing and filtering the first laser to separate a vibration signal S1, demodulating and filtering the second laser to separate a vibration signal S2, calculating the time delay delta T between the signals S1 and S2, and determining the vibration frequency as the position Z where the f vibration occurs;
(7) and obtaining amplitudes m1 and m2 of vibration signals S1 and S2, when max (m1 and m2) is larger than a threshold value, alarming by an alarm module, reading the moment T by a controller, determining an infrared high-definition camera according to the vibration position Z, simultaneously reading video information and AIS module signals by the controller, and accurately determining the fault position of the cable.
2. A method of monitoring a submarine cable monitoring system according to claim 1, wherein: the light source is a pumping light source, the Brillouin frequency shift is only related to the temperature and the strain born by the optical fiber, and the temperature and the strain are related as follows:
vB(T，0)＝vB(T0，0)+CT，v.(T-T0)
vB(T0，ε)＝vB(T0，0)+Cε，v.ε
in the formula: v. ofB(T, 0) is the corresponding Brillouin frequency shift when the optical fiber is not strained under the temperature T; v. ofB(T0ε) is at the reference temperature T0Corresponding Brillouin frequency, C under time-free strain and strain epsilonT，vAnd Cε，vAnd epsilon is respectively the temperature and the strain coefficient of Brillouin frequency shift, the change of strain is solved through the equation, and when the change of strain exceeds a strain threshold value, the controller controls the alarm device to alarm.
3. A method of monitoring a submarine cable monitoring system according to claim 1, wherein: the drying method comprises the following steps:
selecting a proper wavelet function, determining the optimal number of wavelet decomposition layers, and performing wavelet signal decomposition of M layers on the initial signal;
the wavelet decomposition comprises high-frequency signals, threshold processing is carried out on the high-frequency signals, and quantization processing is carried out on M layers of high-frequency coefficients;
and performing wavelet signal reconstruction on the low-frequency signal part of each layer of the processed signal to obtain a signal obtained after noise reduction.
4. A method of monitoring a submarine cable monitoring system according to claim 3, wherein: the thresholding method includes a generic threshold based on the Sqtwolog rule, a Stein unbiased likelihood estimation threshold based on the Rigrsure rule, a Stein unbiased risk threshold based on the Heursure rule, and a maximum minimum criterion threshold based on the Minimaxi rule.
5. A method of monitoring a submarine cable monitoring system according to claim 3, wherein: the method is characterized in that an oil filling layer is arranged outside the step, an oil pump is arranged at the end part of the submarine cable, the oil pump is communicated with the oil filling layer through a ball valve, a sensor used for monitoring the oil pressure of the oil filling layer is arranged in the oil filling layer, and the sensor is connected with the ball valve through a controller.
6. A method of monitoring a submarine cable monitoring system according to claim 5, wherein: when the sensor monitors that the oil pressure is abnormal, the controller is connected with the alarm module, the alarm module gives an alarm, and meanwhile the controller controls the ball valve to be opened to carry out oil filling protection on the oil filling layer.
7. A monitoring device of a submarine cable monitoring system according to any of claims 1 to 6, wherein: the system comprises a submarine cable monitoring unit, a data transmission unit, a database management unit, a terrain monitoring unit, a visual conversion unit and a visual display terminal; wherein:
the submarine cable monitoring unit is used for setting a distributed monitoring component along a submarine cable distribution area, wherein the distributed monitoring component comprises a temperature measuring component, a vibration detecting component, a ship operation monitoring component and a submarine cable positioning component;
the data transmission unit is connected to the submarine cable monitoring assembly through the wireless communication connection module, receives monitoring information of the submarine cable monitoring unit, filters, stabilizes and encrypts the information and transmits the information to the database management unit;
the database management unit is used for recording the monitoring information of the submarine cable monitoring unit into the storage server, updating the data in the storage server, deleting the data in the past period, replacing new data, integrating all distributed monitoring components in the same period and then sending the integrated monitoring components to the visual conversion unit;
the topographic monitoring unit is used for setting the distributed topographic monitoring components along a submarine cable distribution area, monitoring the topographic state of the submarine cable, establishing a display model through collected topographic information, and adjusting the model structure in real time through continuously changing topographic data;
the visualization conversion unit is used for dividing the terrain models in the submarine cable distribution area, then performing visualization conversion on the monitoring data of the submarine cable monitoring unit, performing color distinguishing on different areas, superposing the data on the model structure, and performing visualization display;
the visual display terminal comprises a screen display terminal and a mobile personal terminal, and is convenient for workers to check submarine cable information change data at any time.
8. A monitoring device of a submarine cable monitoring system according to claim 7, wherein: the submarine cable monitoring unit is connected to the data transmission unit, the data transmission unit is connected to the database management unit, and the database management unit is connected to the visualization conversion unit; the terrain monitoring unit is also connected to the visualization conversion unit, and the visualization conversion unit is connected to the visualization display terminal; the data transmission unit comprises a wireless communication connection module, an information encryption module and an information transmission module; wherein:
the wireless communication connection module is connected between the submarine cable monitoring unit and the database management unit and has a signal filtering and stabilizing function;
the information encryption module is used for transmitting the information data acquired by the wireless communication connection module, so that the information security in the transmission process is ensured;
and the information transmission module transmits the information data to the database management unit.
9. A monitoring device of a submarine cable monitoring system according to claim 8, wherein: the database management unit comprises a data recording module, a data updating module and a data synchronous integration module; wherein:
the data recording module is used for recording the monitoring data transmitted by the data transmission unit in the storage server and managing the monitoring data in a regional mode;
the data updating module is used for updating the data in the storage server, deleting the past date data and replacing the new data;
the data synchronous integration module is used for synchronously integrating the monitoring results of all distributed monitoring components in the submarine cable distribution area;
the terrain monitoring unit comprises a terrain data acquisition module, a terrain model establishing module and a model adjusting module; wherein:
the topographic data acquisition module comprises an ocean current movement monitoring component, a submarine topographic change movement monitoring component and a sea surface channel track monitoring component;
the terrain model establishing module is used for establishing a display model through the terrain information collected by the terrain data acquisition module;
and the model adjusting module adjusts the model structure in real time according to the updated data of the topographic data acquisition module.
10. A monitoring device of a submarine cable monitoring system according to claim 9, wherein: the visual conversion unit comprises an area division module, a data visual processing module and an interface transmission module; wherein:
the region division module is used for carrying out region division on the terrain model and comprises a marine activity frequent region, a ship activity frequent region, an ocean current activity frequent region and a secondary monitoring region;
the data visualization processing module is used for performing visualization conversion on the submarine cable monitoring information received after synchronization;
the interface transmission module is used for transmitting the converted visual interface to the visual display terminal;
the visual display terminal comprises a screen display terminal, a mobile personal terminal and a synchronous warning module; wherein:
the screen display terminal transmits a display interface of the visual conversion unit to the liquid crystal screen through the remote wireless transmission module, and a worker controls and adjusts the liquid crystal screen through a computer;
the mobile personal terminal transmits a display interface of the visual conversion unit to the mobile personal terminal through a remote wireless transmission module, and comprises a smart phone, a smart watch and a mobile computer;
the synchronous warning module, the screen display terminal and the mobile personal terminal are all provided with the synchronous warning module, and when the submarine cable monitoring data is abnormal, voice and text display is carried out to remind workers;
the screen display terminal and the mobile personal terminal are both provided with personal login modules, and workers log in the screen display terminal and the mobile personal terminal through registering personal accounts and check submarine cable monitoring data.
Background
When the submarine cable is produced, a manufacturer at least reserves more than 20% of redundant optical fibers, and can use the redundant optical fibers in the composite submarine cable to implement distributed monitoring of the temperature and stress changes of the submarine cable by adopting the optical fiber Brillouin scattering principle. The optical fiber in the composite submarine cable is utilized, the existing submarine cable structure is not changed, a sensor is not required to be added, online continuous real-time monitoring is realized, the hidden trouble and the trend of the fault of the submarine cable can be found in advance, and the passive influence caused by accident outburst is prevented.
Because the existing protection methods all belong to passive protection modes, the actual protection capability of the submarine cable is limited, and particularly, the method has no prevention capability on faults caused by internal factors such as power supply quality, the self quality of the submarine cable and the like. Because the submarine cable has the characteristics of long length, continuous work, burying in soil and the like, the implemented monitoring system has the distributed and real-time monitoring capability.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a monitoring method of a submarine cable monitoring system, which can monitor optical fibers in real time by using vibration, temperature and strain information of the optical fibers and combining an AIS module and an infrared high-definition camera, and can quickly locate the fault position when the optical cable has a fault.
The technical scheme is as follows: in order to solve the technical problem, the monitoring method of the submarine cable monitoring system comprises the following steps:
performing grid division on a submarine cable region, wherein the grid division principle is that the density of grid division is high frequently in the process of ship to ship, an infrared high-definition camera is distributed in the center of each grid, and a vibration threshold value is set;
arranging two optical fibers in each submarine cable, and calibrating the optical fibers;
arranging an induction device at the end part of each optical fiber;
the two optical fibers in one submarine cable are respectively provided with a first light source and a second light source, the first light source is sequentially connected with a first coupler, an electro-optic modulator, a first optical fiber amplifier, a photoelectric detector, a first optical switch and the optical fibers, the second light source is sequentially connected with a second coupler, a polarization controller, an adjustable optical fiber attenuator, an optical isolation module, a second optical switch and the optical fibers, the first coupler and the second coupler are respectively connected with a third coupler, the third coupler is connected with a frequency meter, and the first optical switch and the second optical switch are respectively connected with an optical time domain reflectometer;
the sensing device is connected with the controller, the controller is connected with the alarm module, the controller controls the first light source and the second light source to emit laser, and the two optical fibers output the first laser and the second laser;
demodulating, narrow-band fast Fourier transforming, drying removing and filtering the first laser to separate a vibration signal S1, demodulating and filtering the second laser to separate a vibration signal S2, calculating the time delay delta T between the signals S1 and S2, and determining the vibration frequency as the position Z where the f vibration occurs;
(7) and obtaining amplitudes m1 and m2 of vibration signals S1 and S2, when max (m1 and m2) is larger than a threshold value, alarming by an alarm module, reading the moment T by a controller, determining an infrared high-definition camera according to the vibration position Z, simultaneously reading video information and AIS module signals by the controller, and accurately determining the fault position of the cable.
Preferably, the light source is a pump light source, the brillouin frequency shift is only related to the temperature and strain suffered by the optical fiber, and the temperature and strain relationship is as follows:
vB(T，0)＝vB(T0，0)+CT，v.(T-T0)
vB(T0，ε)＝vB(T0，0)+Cε，v.ε
in the formula: v. ofB(T, 0) is the corresponding Brillouin frequency shift when the optical fiber is not strained under the temperature T; v. ofB(T0ε) is at the reference temperature T0Corresponding Brillouin frequency, C under time-free strain and strain epsilonT，vAnd Cε，vAnd epsilon is respectively the temperature and the strain coefficient of Brillouin frequency shift, the change of strain is solved through the equation, and when the change of strain exceeds a strain threshold value, the controller controls the alarm device to alarm.
Preferably, the drying method of the step comprises the following steps:
selecting a proper wavelet function, determining the optimal number of wavelet decomposition layers, and performing wavelet signal decomposition of M layers on the initial signal;
the wavelet decomposition comprises high-frequency signals, threshold processing is carried out on the high-frequency signals, and quantization processing is carried out on M layers of high-frequency coefficients;
and performing wavelet signal reconstruction on the low-frequency signal part of each layer of the processed signal to obtain a signal obtained after noise reduction.
Preferably, the threshold processing method comprises a universal threshold based on Sqtwolog rule, a Stein unbiased likelihood estimation threshold based on Rigrsure rule, a Stein unbiased risk threshold based on Heursure rule, and a maximum minimum criterion threshold based on Minimaxi rule.
In the invention, the pulse width of the sensing system determines the signal-to-noise ratio and the spatial component ratio of system measurement, the larger the pulse width is, the higher the signal-to-noise ratio is, the higher the measurement accuracy of strain and temperature is, but the spatial resolution is simple. In the present invention, the relationship between the pulse width and the measurement accuracy of temperature and strain is α -79.05 p-1.523+0.938, α is the measurement accuracy in MHz and p is the pulse width in ns and p>0。
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) according to the monitoring method of the submarine cable monitoring system, vibration, temperature and strain information of the optical fiber are utilized, the AIS module and the infrared high-definition camera are combined, the optical fiber can be monitored in real time, and when the optical cable breaks down, the fault position can be quickly located.
(2) The display model is established through the collected topographic information, and the model structure is adjusted in real time through the continuously changing topographic data; and dividing the terrain models in the submarine cable distribution area, and then performing visual conversion on the monitoring data of the submarine cable monitoring unit for visual display.
Drawings
FIG. 1 is a system schematic diagram of a monitoring device
Detailed Description
The invention discloses a monitoring method of a submarine cable monitoring system, which comprises the following steps:
performing grid division on a submarine cable region, wherein the grid division principle is that the density of grid division is high frequently in the process of ship to ship, an infrared high-definition camera is distributed in the center of each grid, and a vibration threshold value is set;
arranging two optical fibers in each submarine cable, and calibrating the optical fibers;
arranging an induction device at the end part of each optical fiber;
the two optical fibers in one submarine cable are respectively provided with a first light source and a second light source, the first light source is sequentially connected with a first coupler, an electro-optic modulator, a first optical fiber amplifier, a photoelectric detector, a first optical switch and the optical fibers, the second light source is sequentially connected with a second coupler, a polarization controller, an adjustable optical fiber attenuator, an optical isolation module, a second optical switch and the optical fibers, the first coupler and the second coupler are respectively connected with a third coupler, the third coupler is connected with a frequency meter, and the first optical switch and the second optical switch are respectively connected with an optical time domain reflectometer;
the sensing device is connected with the controller, the controller is connected with the alarm module, the controller controls the first light source and the second light source to emit laser, and the two optical fibers output the first laser and the second laser;
demodulating, narrow-band fast Fourier transforming, drying removing and filtering the first laser to separate a vibration signal S1, demodulating and filtering the second laser to separate a vibration signal S2, calculating the time delay delta T between the signals S1 and S2, and determining the vibration frequency as the position Z where the f vibration occurs;
(7) and obtaining amplitudes m1 and m2 of vibration signals S1 and S2, when max (m1 and m2) is larger than a threshold value, alarming by an alarm module, reading the moment T by a controller, determining an infrared high-definition camera according to the vibration position Z, simultaneously reading video information and AIS module signals by the controller, and accurately determining the fault position of the cable.
In the invention, the light source is a pumping light source, the Brillouin frequency shift is only related to the temperature and the strain born by the optical fiber, and the temperature and the strain are related as follows:
vB(T，0)＝vB(T0，0)+CT，v.(T-T0)
vB(T0，ε)＝vB(T0，0)+Cε，v.ε
in the formula: v. ofB(T, 0) is the corresponding Brillouin frequency shift when the optical fiber is not strained under the temperature T; v. ofB(T0ε) is at the reference temperature T0Corresponding Brillouin frequency, C under time-free strain and strain epsilonT，vAnd Cε，vAnd epsilon is respectively the temperature and the strain coefficient of Brillouin frequency shift, the change of strain is solved through the equation, and when the change of strain exceeds a strain threshold value, the controller controls the alarm device to alarm.
In the present invention, the drying method of the step comprises the following steps:
selecting a proper wavelet function, determining the optimal number of wavelet decomposition layers, and performing wavelet signal decomposition of M layers on the initial signal;
the wavelet decomposition comprises high-frequency signals, threshold processing is carried out on the high-frequency signals, quantization processing is carried out on M-layer high-frequency coefficients, and the threshold processing method comprises a universal threshold based on Sqtwolog rules, a Stein unbiased likelihood estimation threshold based on Rigrsure rules, a Stein unbiased risk threshold based on Heursure rules and a maximum and minimum criterion threshold based on Minimaxi rules;
and performing wavelet signal reconstruction on the low-frequency signal part of each layer of the processed signal to obtain a signal obtained after noise reduction.
The monitoring device of the submarine cable monitoring system comprises a submarine cable monitoring unit 1, a data transmission unit 2, a database management unit 3, a terrain monitoring unit 4, a visual conversion unit 5 and a visual display terminal 6; wherein:
the submarine cable monitoring unit 1 is used for setting a distributed monitoring component along a submarine cable distribution area, wherein the distributed monitoring component comprises a temperature measuring component, a vibration detecting component, a ship operation monitoring component and a submarine cable positioning component;
the data transmission unit 2 is connected to the submarine cable monitoring component through the wireless communication connection module 21, receives monitoring information of the submarine cable monitoring unit 1, filters, stabilizes and encrypts the information, and transmits the information to the database management unit 3;
the database management unit 3 is used for recording the monitoring information of the submarine cable monitoring unit 1 into the storage server, updating the data in the storage server, deleting the data in the past period, replacing new data, integrating all distributed monitoring components in the same period and then sending the integrated distributed monitoring components to the visual conversion unit 5;
the terrain monitoring unit 4 is used for setting the distributed terrain monitoring components along a submarine cable distribution area, monitoring the terrain state of the submarine cable, establishing a display model according to collected terrain information, and adjusting the model structure in real time according to constantly changing terrain data;
the visualization conversion unit 5 is used for dividing the terrain models in the submarine cable distribution area, then performing visualization conversion on the monitoring data of the submarine cable monitoring unit 1, performing color differentiation on different areas, superposing the data on the model structure, and performing visualization display;
the visual display terminal 6 comprises a screen display terminal 61 and a mobile personal terminal 62, and is convenient for workers to check submarine cable information change data at any time.
Further, the submarine cable monitoring unit 1 is connected to the data transmission unit 2, the data transmission unit 2 is connected to the database management unit 3, and the database management unit 3 is connected to the visualization transformation unit 5; the terrain monitoring unit 4 is also connected to a visual transformation unit 5, the visual transformation unit 5 being connected to a visual display terminal 6.
Further, the data transmission unit 2 includes a wireless communication connection module 21, an information encryption module 22 and an information transmission module 23; wherein:
the wireless communication connection module 21 is connected between the submarine cable monitoring unit 1 and the database management unit 3 and has a signal filtering and stabilizing function;
the information encryption module 22 is used for transmitting the information data acquired by the wireless communication connection module 21 and ensuring the information security in the transmission process;
the information transmission module 23 transmits the information data to the database management unit 3.
Further, the database management unit 3 includes a data recording module 31, a data updating module 32 and a data synchronization integration module 33; wherein:
the data recording module 31 is used for recording the monitoring data transmitted by the data transmission unit 2 in the storage server and managing the monitoring data in different areas;
the data updating module 32 is used for updating the data in the storage server, deleting the past date data and replacing the new data;
and the data synchronous integration module 33 is used for synchronously integrating the monitoring results of all the distributed monitoring components in the submarine cable distribution area.
Further, the terrain monitoring unit 4 includes a terrain data obtaining module 41, a terrain model establishing module 42 and a model adjusting module 43; wherein:
a terrain data acquisition module 41, which comprises an ocean current movement monitoring component, a submarine terrain change movement monitoring component and a sea surface channel track monitoring component;
a terrain model establishing module 42 for establishing a display model according to the terrain information collected by the terrain data acquiring module 41;
the model adjusting module 43 adjusts the model structure in real time according to the updated data of the topographic data acquiring module 41.
Further, the visualization conversion unit 5 includes an area division module 51, a data visualization processing module 52 and an interface transmission module 53; wherein:
the region division module 51 is used for carrying out region division on the terrain model, and comprises a marine activity frequent region, a ship activity frequent region, an ocean current activity frequent region and a secondary monitoring region;
the data visualization processing module 52 performs visualization conversion on the synchronized received submarine cable monitoring information;
and the interface transmission module 53 transmits the converted visual interface to the visual display terminal 6.
Further, the visual display terminal 6 comprises a screen display terminal 61, a mobile personal terminal 62 and a synchronous warning module 63; wherein:
the screen display terminal 61 transmits the display interface of the visual conversion unit 5 to the liquid crystal screen through the remote wireless transmission module, and a worker controls and adjusts the liquid crystal screen through a computer;
the mobile personal terminal 62 transmits the display interface of the visual conversion unit 5 to the mobile personal terminal 62 through a remote wireless transmission module, wherein the display interface comprises a smart phone, a smart watch and a mobile computer;
synchronous warning module 63, all be provided with synchronous warning module 63 on screen display terminal 61 and the mobile personal terminal 62, when the marine cable monitoring data appearance is unusual, carry out pronunciation and text display and remind the staff.
Further, the screen display terminal 61 and the mobile personal terminal 62 are both provided with a personal login module, and a worker logs in the screen display terminal 61 and the mobile personal terminal 62 by registering a personal account number to check the submarine cable monitoring data.
The working principle is as follows: arranging a distributed monitoring component along a submarine cable distribution area, wherein the distributed monitoring component comprises a temperature measuring component, a vibration detecting component, a ship operation monitoring component and a submarine cable positioning component; the wireless communication connection module 21 is connected to the submarine cable monitoring assembly, receives monitoring information of the submarine cable monitoring unit 1, filters, stabilizes and encrypts the information, and transmits the information to the database management unit 3;
the database management unit 3 records the monitoring information of the submarine cable monitoring unit 1 into the storage server, updates the data in the storage server, deletes the data in the past period, replaces new data, integrates all distributed monitoring components in the same period and sends the integrated monitoring components to the visual conversion unit 5; the distributed terrain monitoring components are arranged along a submarine cable distribution area, the terrain state of the submarine cable is monitored, a display model is established through collected terrain information, and the model structure is adjusted in real time through continuously changing terrain data; the method comprises the following steps of dividing a terrain model in a submarine cable distribution area, performing visual conversion on monitoring data of a submarine cable monitoring unit 1, performing color distinguishing on different areas, overlapping the data on a model structure, and performing visual display; the visual display terminal 6 comprises a screen display terminal 61 and a mobile personal terminal 62, and workers can conveniently check submarine cable information change data at any time.
The submarine cable data monitoring system monitors data changes of submarine cables in real time, can convert the data changes into a visual interface in real time for display, and is convenient for workers to check at any time and find out abnormality; the distributed monitoring components are arranged along a submarine cable distribution area, are connected to the submarine cable monitoring components through a wireless communication connection module and receive monitoring information of a submarine cable monitoring unit, a database management unit records the monitoring information of the submarine cable monitoring unit into a storage server, and all the distributed monitoring components in the same period are integrated and then are sent to a visual conversion unit; establishing a display model through the collected topographic information, and adjusting the model structure in real time through the continuously changing topographic data; and dividing the terrain models in the submarine cable distribution area, and then performing visual conversion on the monitoring data of the submarine cable monitoring unit for visual display.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
