Disclosure of Invention
The invention aims to: 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;
the first laser is demodulated, subjected to narrow-band fast Fourier transform, subjected to drying removal and filtered to separate a vibration signal S1, the second laser is demodulated, subjected to filtering to separate a vibration signal S2, the time delay delta T between the signals S1 and S2 is calculated, and the vibration frequency is determined as the vibration generation position Z;
(7) The amplitude m1 and m2 of the vibration signals S1 and S2 are obtained, when max (m 1, m 2) is larger than a threshold value, the alarm module gives an alarm, the controller reads the moment T, the infrared high-definition camera is determined according to the vibration position Z, the controller simultaneously reads video information and AIS module signals, and the cable fault position is accurately determined.
Preferably, the light source is a pump light source, the brillouin frequency shift is only related to the temperature and strain to which the optical fiber is subjected, and the temperature and strain relationship is as follows:
v B (T,0)=v B (T 0 ,0)+C T,v .(T-T 0 )
v B (T 0 ,ε)=v B (T 0 ,0)+C ε,v .ε
in the formula: v. of B (T, 0) is corresponding Brillouin frequency shift when the optical fiber is not strained under the temperature T; v. of B (T 0 ε) is at a reference temperature T 0 Corresponding Brillouin frequency, C under time-free strain and strain epsilon T,v And C ε,v Epsilon is respectively the temperature and the strain coefficient of the Brillouin frequency shift, the change of the strain is solved through the equation, and when the change of the 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 measured by the system, 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 can be simply determined. In the invention, the relation between the pulse width and the measurement precision of temperature and strain is alpha =79.05p -1.523 +0.938, α is the measurement accuracy in MHz and p is the pulse width in ns, 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 to perform visual display.
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-optical 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;
the first laser is demodulated, subjected to narrow-band fast Fourier transform, subjected to drying removal and filtered to separate a vibration signal S1, the second laser is demodulated, subjected to filtering to separate a vibration signal S2, the time delay delta T between the signals S1 and S2 is calculated, and the vibration frequency is determined as the vibration generation position Z;
(7) And obtaining amplitudes m1 and m2 of the vibration signals S1 and S2, when max (m 1 and m 2) is greater 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 strain born by the optical fiber, and the temperature and strain relationship is as follows:
v B (T,0)=v B (T 0 ,0)+C T,v .(T-T 0 )
v B (T 0 ,ε)=v B (T 0 ,0)+C ε,v .ε
in the formula: v. of B (T, 0) is corresponding Brillouin frequency shift when the optical fiber is not strained under the temperature T; v. of B (T 0 ε) is at the reference temperature T 0 Corresponding Brillouin frequency, C under time-free strain and strain epsilon T,v And C ε,v Epsilon is respectively the temperature and the strain coefficient of the Brillouin frequency shift, the change of the strain is solved through the equation, and when the change of the 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 assembly 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, and the visual transformation unit 5 is 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;
a data updating module 32 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 regional division module 51 is used for carrying out regional 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 is used for performing 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 built 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 distinction on different areas, overlapping the data to 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 to perform 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.