CN216411590U - Submarine cable burial depth monitoring system based on optical fiber temperature measurement technology - Google Patents
Submarine cable burial depth monitoring system based on optical fiber temperature measurement technology Download PDFInfo
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- CN216411590U CN216411590U CN202122894016.XU CN202122894016U CN216411590U CN 216411590 U CN216411590 U CN 216411590U CN 202122894016 U CN202122894016 U CN 202122894016U CN 216411590 U CN216411590 U CN 216411590U
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Abstract
The utility model provides a submarine cable buried depth monitoring system based on an optical fiber temperature measurement technology, which relates to the technical field of submarine cable monitoring, can realize 7 x 24 hour uninterrupted unattended monitoring on the buried depth of a submarine cable, and effectively improves the real-time performance and accuracy of submarine cable buried depth monitoring and alarming; the system comprises: the device comprises a detection optical fiber, a pumping optical fiber, a BOTDA detection host and a buried depth monitoring and analyzing unit; the detection optical fiber and the pumping optical fiber are both arranged inside the submarine cable along the axial direction of the submarine cable; one ends of the detection optical fiber and the pumping optical fiber are connected with the BOTDA detection host, and the other ends of the detection optical fiber and the pumping optical fiber are connected with each other to form a loop with the BOTDA detection host; the BOTDA detection host is connected with the buried depth monitoring and analyzing unit. The technical scheme provided by the utility model is suitable for the submarine cable monitoring process.
Description
Technical Field
The utility model relates to the technical field of submarine cable monitoring, in particular to a submarine cable burial depth monitoring system based on a distributed optical fiber temperature measurement technology.
Background
The submarine cable is a 'blood vessel' of offshore wind power, and transmits electric energy generated by an offshore wind generating set by utilizing wind energy to land, belongs to a new industry in China, and the submarine cable burial depth monitoring solution applied to the market at present comprises the following steps: and the monitoring of the buried depth of the cable is realized by diving observation, underwater robot detection and ultrasonic detection. The contents and respective drawbacks of these several solutions are as follows:
1. diving observation
The diving observation is that a diver dives into the sea bottom and manually detects the cable at the corresponding position by adopting a seeing and touching mode. The disadvantages are as follows: the method has high requirement on personnel, fussy operation, low efficiency and high danger coefficient.
2. Underwater robot detection
By lowering the underwater robot on the vessel above the submarine cable area, the cable is observed along the submarine cable path by the camera of the underwater robot. The disadvantages are as follows: need special ship to detect along submarine cable route, underwater robot receives seabed topography influence great, and easily receives weather effect, and detection efficiency is low.
3. Ultrasonic testing
The submarine elevation is scanned along a cable path by installing a side-scan sonar on a special ship, the side-scan sonar transmits ultrasonic waves with specific frequency to the seabed and collects sound wave information reflected by different media in real time to determine the seabed elevation, and whether the submarine cable is exposed or not can be obtained. The disadvantages are as follows: the method has high requirements on ships, is easily influenced by weather and water quality, and cannot monitor in real time.
Accordingly, there is a need to develop a new submarine cable burial depth monitoring system based on distributed fiber optic thermometry to address the deficiencies of the prior art to solve or mitigate one or more of the problems set forth above.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a submarine cable buried depth monitoring system based on an optical fiber temperature measurement technology, which can realize 7 × 24 hours of uninterrupted unattended monitoring of the buried depth of a submarine cable, and effectively improve the real-time performance and accuracy of submarine cable buried depth monitoring and alarming.
The utility model provides a submarine cable burial depth monitoring system based on an optical fiber temperature measurement technology, which is characterized by comprising: the device comprises a detection optical fiber, a pumping optical fiber, a BOTDA detection host and a buried depth monitoring and analyzing unit;
the detection optical fiber and the pumping optical fiber are both arranged inside the submarine cable along the axial direction of the submarine cable;
one ends of the detection optical fiber and the pumping optical fiber are connected with the BOTDA detection host, and the other ends of the detection optical fiber and the pumping optical fiber are connected with each other to form a loop with the BOTDA detection host;
the BOTDA detection host is connected with the buried depth monitoring and analyzing unit.
The above aspects and any possible implementations further provide an implementation in which the probe fiber and the pump fiber are both single-mode fibers.
The above-mentioned aspects and any possible implementation manner further provide an implementation manner, where the BOTDA detection host includes a detection light emitter and a pump light emitter, the detection fiber is connected to the detection light emitter, and the pump fiber is connected to the pump light emitter.
The aspects and any possible implementation manners described above further provide an implementation manner, where the BOTDA detection host further includes a signal acquisition device and an acquired data processing unit; the signal acquisition device is connected with the pumping optical fiber to realize signal acquisition; the collected data processing unit is connected with the signal collecting device to realize the processing of the collected data.
The above-mentioned aspects and any possible implementation manners further provide an implementation manner, and the collected data processing unit is connected with the burial depth monitoring and analyzing unit.
The above-described aspect and any possible implementation manner further provide an implementation manner, where a frequency difference of backscattered light generated in the pump optical fiber by the pump light emitted by the pump light emitter is a brillouin frequency shift; the frequency difference between the probe light emitted by the probe light emitter and the pump light is equal to Brillouin frequency shift.
The above aspects and any possible implementation manners further provide an implementation manner that the detection fiber and the pump fiber are two fibers in the original fiber of the submarine cable or two fibers additionally arranged on the original fiber of the submarine cable.
The above aspects and any possible implementations further provide an implementation of a submarine cable provided with the probe fibers and the pump fibers, comprising: the optical fiber cable comprises an electric energy transmission wire harness (namely a power unit in figure 1), a grounding wire harness, an optical fiber wire harness consisting of a plurality of optical fibers including the detection optical fibers and the pumping optical fibers, and an inner protective layer, an armor layer and an outer coating layer which are sequentially wrapped on the periphery of all the wire harnesses. All the wire harnesses are arranged side by side to form a core harness of the whole submarine cable, and an inner sheath layer, an armor layer and an outer coating layer are arranged outside the core harness.
The above-mentioned aspects and any possible implementation manners further provide an implementation manner, where the buried depth monitoring and analyzing unit includes a data analysis module and an alarm module, and the alarm module is connected to the data analysis module. The data analysis module is a CPU or a computer provided with a processing model, and the alarm module can be an acousto-optic alarm device, can also be in communication connection with related terminal equipment to realize information alarm, or can be in alarm modes such as image alarm and the like, and can also be in combined use of multiple alarm modes.
Compared with the prior art, one of the technical schemes has the following advantages or beneficial effects: the embedded depth of the submarine cable is monitored and analyzed in real time by using a built-in sensing optical fiber of the submarine cable, a BOTDA detection host and an embedded depth monitoring system;
another technical scheme in the above technical scheme has the following advantages or beneficial effects: the accurate position of the exposed submarine cable or the large buried depth change can be found, and early warning is formed;
another technical scheme in the above technical scheme has the following advantages or beneficial effects: unattended operation can be realized, the monitoring efficiency is high, and the cost is low;
another technical scheme in the above technical scheme has the following advantages or beneficial effects: the real-time performance and the accuracy of monitoring, early warning and alarming of the cable burial depth of the offshore wind farm are effectively improved, and the effective protection of the submarine cable in the range of the offshore wind farm is realized in all directions.
Of course, it is not necessary for any one product in which the utility model is practiced to achieve all of the above-described technical effects simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an arrangement of submarine cable sensing fibers according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a buried depth monitoring system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of the BOTDA detection host according to one embodiment of the present invention;
fig. 4 is a schematic diagram of a buried depth calculation process of a buried depth monitoring system according to an embodiment of the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the utility model, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the defects of the prior art, the utility model provides a submarine cable buried depth monitoring system based on a distributed optical fiber temperature measurement technology, which comprises a distributed optical fiber temperature sensor, a BOTDA detection host and a buried depth monitoring and analyzing unit platform, wherein,
the distributed optical fiber temperature sensor comprises two sensing optical fibers which are arranged in the submarine cable, the sensing optical fibers are continuously distributed in the submarine cable and integrated with the submarine cable, one optical fiber is used for transmitting detection light in the optical fiber, the other optical fiber is used for transmitting pump light in the optical fiber, and the temperature information of the cable distributed along the cable is detected and sensed.
The BOTDA detection host generates laser pulse and detection light according to requirements and transmits the laser pulse and the detection light to a sensing optical fiber outside the detection host according to the control of the buried depth monitoring and analyzing unit, a signal acquisition device of the detection host acquires photoelectric signals of acquisition points in real time, and the acquired data are transmitted to the buried depth monitoring and analyzing unit through a gigabit Ethernet port after the photoelectric signals are processed by digital signals. The method comprises photoelectric signal conversion, digital-to-analog conversion and signal processing, and the digitized signals are transmitted to a buried depth monitoring and analyzing unit; the acquisition point of the signal acquisition device is positioned at the near detection main machine section of the pumping optical fiber.
The buried depth monitoring and analyzing unit is a high-performance computer and is used for carrying out mode configuration, data analysis, image processing, alarm processing and data storage.
The sensing optical fiber is a G.652/G.654/G.655 single-mode optical fiber.
The detection light is a light structure, is generated by a laser of a BOTDA detection host, and is used for generating stimulated Brillouin scattering light.
The pump light is a light structure, is generated by a laser of a BOTDA detection host, and is used for generating back scattering light.
The BOTDA is based on a stimulated Brillouin scattering distributed sensing technology, pumping light and detection light are respectively transmitted into a sensing optical fiber from two ends in opposite directions, the frequency difference between the pumping light and backscattered light generated in the sensing optical fiber is Brillouin frequency shift, stimulated Brillouin scattering is generated in the optical fiber when the frequency difference between the detection light and the pumping light is equal to the Brillouin frequency shift, and therefore the Brillouin frequency shift can be obtained.
The submarine cable burial depth monitoring system utilizes two built-in sensing optical fibers in a submarine cable as temperature sensors, and the schematic layout of the submarine cable sensing optical fibers is shown in figure 1. One of the optical fibers is used for transmitting probe light in the optical fiber, and the other optical fiber is used for transmitting pump light in the optical fiber. The BOTDA detection host continuously emits detection light and pumping light to the two detection optical fibers respectively, as shown in fig. 3, the frequency difference between the pumping light and the back scattering light generated in the sensing optical fiber is brillouin frequency shift, the frequency difference between the detection light and the pumping light is equal to the brillouin frequency shift, stimulated brillouin scattering is generated in the optical fiber, and the temperature change of the sensing optical fiber is monitored according to the principle that the brillouin scattering light power linearly increases along with the temperature rise. The BOTDA host machine simultaneously carries out photoelectric conversion, amplification shaping, sampling, processing and transmission on the optical signals, and transmits the digitized signals to the buried depth monitoring and analyzing unit. And (3) establishing a submarine cable burial depth analysis calculation model as shown in figure 4. The system platform performs mode configuration, data analysis, image processing, alarm processing and data storage, thereby detecting and sensing cable temperature information distributed along the cable.
The specific working process of the buried depth monitoring and analyzing unit platform comprises the following steps: a standard high-performance industrial computer is adopted, and buried depth monitoring system software runs on the standard high-performance industrial computer; the system is connected with the BOTDA detection host through the gigabit Ethernet port, controls and receives data uploaded by the BOTDA detection host, and performs algorithm analysis, so that cable burial depth alarm and position display are realized.
The specific functions are as follows: configuring a BOTDA detection host, receiving data uploaded by the BOTDA detection host, and converting the data into standard data used by an algorithm and an interaction module; the cable burial depth curve is displayed in real time, and the change condition of the cable burial depth is visually reflected; receiving input of external control and parameter configuration, and output of state, alarm, log, file, display, etc.
Introduction of the principle:
a cable body in the submarine cable buried depth monitoring system adopts a cable dynamic current-carrying capacity numerical calculation model; the direct-buried environment adopts a numerical solution of an IEC0287 direct-buried cable calculation method. The two models are combined to form a global model, the upper boundary of the global model is the seabed sandy soil surface, the lower boundary of the global model is deep constant temperature soil, and modeling parameters comprise a cable structure, buried depth, sandy soil heat capacity and heat resistance and an annual air temperature curve. The global model continuously refreshes an internal temperature field under the drive of real-time load current and seawater temperature, and the system outputs the real-time temperature of the submarine cable. The closest buried depth estimation can be obtained by identifying the measured temperature change of the specific submarine cable position and the closeness degree of the change of the calculated values.
The alarm processing mainly comprises the following aspects:
1. absolute depth of cable buried → bare or not
2. Cable burying depth variation → variation trend judgment
3. Depth profile along the length of the cable → distributed depth variation along the length of the cable
Early warning: the change trend of the buried depth of the submarine cable is judged by comparing the depth change quantity of the tested buried depth of the cable and the depth distribution condition of the cable, and an early warning mechanism is formed.
Warning: and comparing the obtained absolute depth of the buried cable with the original absolute depth of the cable during laying to judge whether the submarine cable is exposed or not and finally form an alarm.
The submarine cable buried depth monitoring device based on the distributed optical fiber temperature measurement technology can be used for real-time monitoring of the buried depth state of the submarine cable, and has the following advantages as shown in figure 2:
1. the submarine cable buried depth monitoring system can realize real-time monitoring of the submarine cable buried depth state and achieve continuous monitoring of 7 x 24 hours.
2. The accurate position of the exposed submarine cable or the large buried depth change can be found, and early warning is formed.
3. The unattended operation can be realized, the monitoring efficiency is high, and the cost is low.
The submarine cable buried depth monitoring system based on the distributed optical fiber temperature measurement technology provided by the utility model realizes real-time active monitoring on the buried depth distribution state of the submarine cable by using the sensing optical fiber built in the submarine cable, building a submarine cable buried depth analysis model and using the load current and the distribution temperature of the cable through the submarine cable buried depth monitoring device based on the optical fiber temperature measurement sensing technology. The system can realize 7-24-hour continuous monitoring of the submarine cable burying depth, track and record the submarine cable depth state, early warn the exposed cable in advance, and alarm the cable buried shallowly. The technical scheme of the utility model can effectively improve the real-time performance and accuracy of monitoring, early warning and alarming of the cable burial depth of the offshore wind farm, and comprehensively realize effective protection of the submarine cable in the range of the offshore wind farm.
The submarine cable buried depth monitoring system based on the distributed optical fiber temperature measurement technology provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
The term "and/or" as used herein is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Claims (9)
1. A submarine cable burial depth monitoring system based on optical fiber temperature measurement technology, which is characterized by comprising: the device comprises a detection optical fiber, a pumping optical fiber, a BOTDA detection host and a buried depth monitoring and analyzing unit;
the detection optical fiber and the pumping optical fiber are both arranged inside the submarine cable along the axial direction of the submarine cable;
one ends of the detection optical fiber and the pumping optical fiber are connected with the BOTDA detection host, and the other ends of the detection optical fiber and the pumping optical fiber are connected with each other to form a loop with the BOTDA detection host;
the BOTDA detection host is connected with the buried depth monitoring and analyzing unit.
2. The submarine cable burial depth monitoring system based on optical fiber thermometry according to claim 1, wherein the detection fiber and the pump fiber are both single-mode fibers.
3. The submarine cable buried depth monitoring system based on optical fiber thermometry according to claim 1, wherein the BOTDA detection host comprises a detection light emitter and a pump light emitter, the detection optical fiber is connected with the detection light emitter, and the pump optical fiber is connected with the pump light emitter.
4. The submarine cable burial depth monitoring system based on optical fiber temperature measurement technology according to claim 3, wherein the BOTDA detection host further comprises a signal acquisition device and an acquisition data processing unit; the signal acquisition device is connected with the pumping optical fiber to realize signal acquisition; the collected data processing unit is connected with the signal collecting device to realize the processing of the collected data.
5. The submarine cable burial depth monitoring system based on optical fiber thermometry according to claim 4, wherein the collected data processing unit is connected with the burial depth monitoring and analyzing unit.
6. The submarine cable buried depth monitoring system based on optical fiber thermometry according to claim 3, wherein the frequency difference of backscattered light generated in the pump optical fiber by the pump light emitted by the pump light emitter is Brillouin frequency shift; the frequency difference between the probe light emitted by the probe light emitter and the pump light is equal to Brillouin frequency shift.
7. The submarine cable burial depth monitoring system based on optical fiber thermometry according to claim 1, wherein the detection optical fiber and the pump optical fiber are two optical fibers of or added to the original optical fiber of the submarine cable.
8. The submarine cable burial depth monitoring system based on optical fiber thermometry according to claim 1, wherein the submarine cable provided with the detection optical fiber and the pump optical fiber comprises: the optical fiber cable comprises an electric energy transmission wire harness, a grounding wire harness, an optical fiber wire harness consisting of a plurality of optical fibers including the detection optical fibers and the pumping optical fibers, and an inner protective layer, an armor layer and an outer coating layer which are sequentially wrapped on the periphery of all the wire harnesses.
9. The submarine cable burial depth monitoring system based on optical fiber thermometry according to claim 1, wherein the burial depth monitoring and analyzing unit comprises a data analyzing module and an alarm module, and the alarm module is connected with the data analyzing module.
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