CN103513147B - A kind of undersea cable real-time monitoring system and monitoring method - Google Patents
A kind of undersea cable real-time monitoring system and monitoring method Download PDFInfo
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- CN103513147B CN103513147B CN201310408092.2A CN201310408092A CN103513147B CN 103513147 B CN103513147 B CN 103513147B CN 201310408092 A CN201310408092 A CN 201310408092A CN 103513147 B CN103513147 B CN 103513147B
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Abstract
The present invention discloses a kind of undersea cable real-time monitoring system and the monitoring method of field of measuring technique. Its technical scheme is, design undersea cable real-time monitoring system, realize the temperature in undersea cable operational process and strain by detection back rayleigh scattering polarisation of light state and phase place, thus realize the Real-Time Monitoring of the status informations such as external world, insulation degradation, electric leakage, ground fault. Not only increase the utilization ratio of equipment, reduce monitoring cost, also greatly reduce the rate of failing to report and False Rate, it may be achieved to sea cable three-dimensional, on a large scale, at full line, networking Real-Time Monitoring, the safe and stable operation of undersea cable is had significance.
Description
Technical field
The invention belongs to field of measuring technique, particularly relate to a kind of undersea cable real-time monitoring system and monitoring method.
Background technology
China shoreline reaches 3.2 ten thousand kilometers, big Small islands has more than 6500, territorial waters area about 4,730,000 square kilometres, offshore work platform is numerous, and undersea cable plays keying action in the production life of long-range power supply, high pressure transmission of electricity, power communication, Signal transmissions, guarantee islander and offshore work platform normally run.
Owing to being subject to the factors such as the washing away of seawater, erosion, aging of insulation, the block-water performance of undersea cable is easily caused to be deteriorated so that undersea cable produces leakage current, thus causes undersea cable to raise in the temperature of fault point, and then cause bigger fault, and such as: ground short circuit fault etc. The change of undersea cable load current, also the temperature of undersea cable can be made to change, namely the change of undersea cable temperature can reflect the operation conditions of undersea cable, for making undersea cable run in the temperature range of safety, extend undersea cable work-ing life, it is necessary to undersea cable healthy state is carried out daily monitoring maintenance.
Along with the increase day by day of ocean exploitation activity, the impact that sea cable runs be can not be ignored by cultivation in marine site, fishing net, ship anchor etc., and under traditional way, fallen anchor, cast anchor, cannot early warning when fishery is fished for, ship pulls, bank base operation etc. destroys, difficulty is salvaged in the accurate location of accident point and confirmation and the disconnected cable head of accident ship, have impact on accident repairing and loss Claims Resolution. Therefore study the novel method of undersea cable health monitoring, new tool, for guaranteeing power network safety operation, build strong intelligent grid and have very important significance.
In undersea cable Monitoring systems, traditional optical time domain reflectometer (OTDR) utilizes the back rayleigh scattering signal that light transmits generation in a fiber to carry out location, cable trouble spot, sea, but this kind of technology can only detect after sea cable is destroyed generation fracture by infringement event, cannot realize the real time on-line monitoring of infringement event. The temperature distribution that optical time domain Raman Back Scattering distributed fiberoptic sensor (ROTDR) utilizes the Raman Back Scattering signal measurement optical fiber in multimode optical fibers along the line, strain-gauging cannot be realized, therefore this technology can only realize the on-line monitoring of sea cable temperature information, the strain events such as the anchor that falls, ship towing cannot be carried out on-line monitoring. Therefore, undersea cable urgently needs a kind of effective realtime on-line monitoring method.
Summary of the invention
For the on-line monitoring problem of the temperature that cannot realize in the traditional undersea cable Monitoring systems mentioned in background technology in the cable operational process of sea and strain, the present invention proposes a kind of undersea cable real-time monitoring system and monitoring method.
A kind of undersea cable real-time monitoring system, it is characterized in that, described system comprises narrow spectrum light source, the first coupling mechanism, Polarization Controller PC, electrooptic modulator EOM, surge generator, the first shield retaining, the first erbium-doped optical fiber amplifier EDFA, the 2nd shield retaining, the first optical filter, annular device, the polarizer, sensor fibre, the 2nd coupling mechanism, the 2nd erbium-doped optical fiber amplifier EDFA, analyzer, the 3rd shield retaining, the 2nd optical filter, the first photoelectric detector, the 2nd photoelectric detector, data acquisition and display unit and clock control cell;
Wherein, described narrow spectrum light source, the first coupling mechanism, Polarization Controller PC, electrooptic modulator EOM, the first shield retaining, the first erbium-doped optical fiber amplifier EDFA, the 2nd shield retaining, the first optical filter, annular device, the polarizer and sensor fibre connect in turn; Described narrow spectrum light source is for generation of narrow spectrum light; The effect of described first coupling mechanism is that the laser pulse that laser apparatus is launched is coupled into Polarization Controller PC; Described electrooptic modulator EOM is for modulating pulse light; Described first shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first erbium-doped optical fiber amplifier EDFA is used for paired pulses light and amplifies; Described 2nd shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first optical filter is used for the spontaneous emission noise that filtering first erbium-doped optical fiber amplifier EDFA is introduced to system; The effect of the described polarizer converts common optical signal to line polarized light;
Described surge generator is connected with described clock control cell and electrooptic modulator EOM respectively; Described surge generator, for generation of pulse signal, modulates narrow spectrum light by electrooptic modulator EOM so that it is become pulse light;
Described clock control cell is connected with described narrow spectrum light source and data acquisition and display unit respectively; Described data acquisition and display unit is for extracting polarization state and the phase place information of Rayleigh scattering optical signal, and carries out calculating and showing;
Described 2nd coupling mechanism is connected with described annular device, the 2nd erbium-doped optical fiber amplifier EDFA and analyzer respectively; Described 2nd coupling mechanism is that back rayleigh scattering signal is divided into two-way; Described 2nd erbium-doped optical fiber amplifier EDFA amplifies for the light received; Described analyzer is for detecting polarization state;
Described 2nd erbium-doped optical fiber amplifier EDFA, the 3rd shield retaining, the 2nd optical filter, the first photoelectric detector and data acquisition and display unit connect in turn; Described 3rd shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first photoelectric detector is for turning into electrical signal by the optical signal received;
Described analyzer, the 2nd photoelectric detector and data acquisition and display unit connect in turn; Described 2nd photoelectric detector is for turning into electrical signal by the optical signal received.
Described narrow spectrum light source spectrum width is 3kHz��12.5GHz.
Described system adopts the mode of modulation indirectly that the Laser Modulation that narrow spectrum light source produces is become pulse light.
Described first optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described first optical filter bandwidth equals light source spectrum width.
Described 2nd optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described 2nd optical filter bandwidth equals light source spectrum width.
A kind of undersea cable method of real-time, it is characterised in that, described method specifically comprises the following steps:
Step 1: the single-mode fiber in described photoelectric composite sea cable is accessed undersea cable real-time monitoring system as sensor fibre, or be wrapped on conventional ocean cable by communications optical cable to measure, the single-mode fiber in communications optical cable is accessed undersea cable real-time monitoring system as sensor fibre;
Step 2: undersea cable real-time monitoring system, to injected pulse light in single-mode fiber, produces Rayleigh scattering in single-mode fiber;
Step 3: the Rayleigh scattering light that undersea cable real-time monitoring system returns according to part different in single-mode fiber is with the phase place information of reflection spot place fl transmission light, it is achieved the monitoring of polarization state and phase place;
Step 4: polarization state and the phase place information being extracted Rayleigh scattering optical signal by undersea cable real-time monitoring system data acquisition and display unit, it is achieved the temperature that single-mode fiber is along the line and strain information monitoring;
Step 5: the running status being analyzed undersea cable by the change of temperature and strain, it is achieved the real time on-line monitoring of undersea cable.
The invention has the beneficial effects as follows, realize the temperature in undersea cable operational process and strain by detection back rayleigh scattering polarisation of light state and phase place, thus realize the Real-Time Monitoring of the status informations such as external world, insulation degradation, electric leakage, ground fault. Not only increase the utilization ratio of equipment, reduce monitoring cost, also greatly reduce the rate of failing to report and False Rate, it may be achieved to sea cable three-dimensional, on a large scale, at full line, networking Real-Time Monitoring, the safe and stable operation of undersea cable is had significance.
Accompanying drawing explanation
Fig. 1 is the interface chart of employing undersea cable real-time monitoring system on-line monitoring undersea cable status information provided by the invention; Wherein, a is the measurement interface chart of photoelectric composite sea cable; Communications optical cable is wrapped on conventional ocean cable to carry out the interface chart measured by b;
Fig. 2 is the structure iron of undersea cable real-time monitoring system provided by the invention;
Wherein, 1-undersea cable real-time monitoring system; 2-photoelectric composite sea cable; The single-mode fiber of compound in 3-photoelectric composite sea cable; 4-conventional ocean cable; Single-mode fiber in 5-communications optical cable; 6-first coupling mechanism; 7-first shield retaining; 8-the 2nd shield retaining; 9-annular device; The 10-polarizer; 11-Fiber Bragg Grating FBG; 12-the 3rd shield retaining; 13-sensor fibre; 14 the 2nd coupling mechanisms.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is done explanation in detail. It should be emphasized that following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.
Fig. 1 is the interface chart of employing undersea cable real-time monitoring system on-line monitoring undersea cable status information provided by the invention; Wherein, a is the measurement interface chart of photoelectric composite sea cable, and undersea cable real-time monitoring system 1 is directly connected with the single-mode fiber 3 of compound in photoelectric composite sea cable 2; Communications optical cable is wrapped on conventional ocean cable to carry out the interface chart measured by b, and undersea cable real-time monitoring system 1 is connected with the single-mode fiber 5 in communications optical cable.
Fig. 2 is the structure iron of undersea cable real-time monitoring system provided by the invention. In Fig. 2, Rayleigh scattering light phase-detection general requirement spectrum width is very narrow, adopts super-narrow line width laser apparatus. Because if laser apparatus spectrum width is relatively big, the laser pulse of generation just containing various spectrum component, can launch superposition when the Rayleigh beacon of these signals arrives detector simultaneously, instead of the interference of super-narrow line width laser apparatus. Select the semiconductor laser being applicable to as light source, detect while realizing Rayleigh scattering light phase place and polarization state simultaneously, need carefully to select light source spectrum width, spectrum width must be selected between 3kHz��12.5GHz, both can having guaranteed that interference effect occurred, interference effect can not flood too by force and completely the effect of polarization state modulation simultaneously.
Measuring to realize profile, it is necessary to sensor fibre injected pulse light, Laser Modulation is become pulse light by the mode indirectly modulated by this system. Clock control cell triggers narrow spectrum light source so that it is produce the narrow spectrum light being applicable to systems axiol-ogy. Meanwhile, clock control cell trigger generator, surge generator is started working, and produces the pulse signal meeting system requirement, and this pulse signal goes by electrooptic modulator to modulate narrow spectrum light so that it is become pulse light. In order to prevent this pulse light reverse transfer from narrow spectrum light source is caused infringement, add the first shield retaining, ensure pulse light one way transmission in a fiber. After continuous light is modulated into pulsed optical signals, luminous power is lower, need to amplify through the first erbium-doped optical fiber amplifier EDFA, first erbium-doped optical fiber amplifier EDFA can introduce spontaneous emission noise to system, needing to equal wide this noise signal of the first optical filter filtering of light source spectrum through bandwidth, this optical filter is made up of optical circulator and Fiber Bragg Grating FBG. Pulse light after denoising is injected in sensor fibre by the c mouth of annular device. Light transmits in a fiber, Rayleigh scattering can be produced, occur in carry on the back to Rayleigh scattering signal along optical fiber reverse transfer, arrive the d mouth of annular device, scattered light one way transmission in annular device is exported by e mouth, and the back-scattering light of output is divided into two-way through the f mouth equal proportion of coupling mechanism. 2nd coupling mechanism g mouth optical signal is directly sent into the first photoelectric detector after the 2nd erbium-doped optical fiber amplifier EDFA amplification filtering and is carried out opto-electronic conversion, and coupling mechanism h mouth optical signal is converted into electrical signal by the 2nd photoelectric detector again after an analyzer detection polarization state. Due to completely identical with fl transmission polarisation of light state at reflection spot place scattered light, therefore back rayleigh scattering light just carries scatter point place fl transmission polarisation of light information, therefore just can be known the status information at this scatter point place by detection polarization information. Simultaneously, the Rayleigh scattering light that different part returns from optical fiber is equally with the phase place information of reflection spot fl transmission light, after interference effect, the power size of this bundle back rayleigh scattering light also can be subject to the modulation of phase place, turn into having the fluctuation of certain rule, therefore just can be known the status information at this scatter point place by detected phase information. Clock control cell control data collection and display unit gather two ways of optical signals and carry out the process such as denoising, extract polarization state and the phase place information of Rayleigh scattering optical signal, thus realize optical fiber temperature along the line and strain information monitoring. Analyze the running status of sea cable finally by the change of temperature and strain, thus realize the real time on-line monitoring of undersea cable.
The above; it is only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, any it is familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (6)
1. a undersea cable real-time monitoring system, it is characterized in that, described system comprises narrow spectrum light source, the first coupling mechanism, Polarization Controller PC, electrooptic modulator EOM, surge generator, the first shield retaining, the first erbium-doped optical fiber amplifier EDFA, the 2nd shield retaining, the first optical filter, annular device, the polarizer, sensor fibre, the 2nd coupling mechanism, the 2nd erbium-doped optical fiber amplifier EDFA, analyzer, the 3rd shield retaining, the 2nd optical filter, the first photoelectric detector, the 2nd photoelectric detector, data acquisition and display unit and clock control cell;
Wherein, described narrow spectrum light source, the first coupling mechanism, Polarization Controller PC, electrooptic modulator EOM, the first shield retaining, the first erbium-doped optical fiber amplifier EDFA, the 2nd shield retaining, the first optical filter, annular device, the polarizer and sensor fibre connect in turn; Described narrow spectrum light source is for generation of narrow spectrum light; The effect of described first coupling mechanism is that the laser pulse that laser apparatus is launched is coupled into Polarization Controller PC; Described electrooptic modulator EOM is for modulating pulse light; Described first shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first erbium-doped optical fiber amplifier EDFA is used for paired pulses light and amplifies; Described 2nd shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first optical filter is used for the spontaneous emission noise that filtering first erbium-doped optical fiber amplifier EDFA is introduced to system; The effect of the described polarizer converts common optical signal to line polarized light;
Described surge generator is connected with described clock control cell and electrooptic modulator EOM respectively; Described surge generator, for generation of pulse signal, modulates narrow spectrum light by electrooptic modulator EOM so that it is become pulse light;
Described clock control cell is connected with described narrow spectrum light source and data acquisition and display unit respectively; Described data acquisition and display unit is for extracting polarization state and the phase place information of Rayleigh scattering optical signal, and carries out calculating and showing;
Described 2nd coupling mechanism is connected with described annular device, the 2nd erbium-doped optical fiber amplifier EDFA and analyzer respectively; Described 2nd coupling mechanism is that back rayleigh scattering signal is divided into two-way; The light received is amplified by described 2nd erbium-doped optical fiber amplifier EDFA; Described analyzer is for detecting polarization state;
Described 2nd erbium-doped optical fiber amplifier EDFA, the 3rd shield retaining, the 2nd optical filter, the first photoelectric detector and data acquisition and display unit connect in turn; Described 3rd shield retaining is used for preventing pulse light reverse transfer from narrow spectrum light source is caused infringement, ensures pulse light one way transmission; Described first photoelectric detector is for turning into electrical signal by the optical signal received;
Described analyzer, the 2nd photoelectric detector and data acquisition and display unit connect in turn; Described 2nd photoelectric detector is for turning into electrical signal by the optical signal received.
2. a kind of undersea cable real-time monitoring system according to claim 1, it is characterised in that, described narrow spectrum light source spectrum width is 3kHz��12.5GHz.
3. a kind of undersea cable real-time monitoring system according to claim 1, it is characterised in that, described system adopts the mode of modulation indirectly that the Laser Modulation that narrow spectrum light source produces is become pulse light.
4. a kind of undersea cable real-time monitoring system according to claim 1, it is characterised in that, described first optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described first optical filter bandwidth equals light source spectrum width.
5. a kind of undersea cable real-time monitoring system according to claim 1, it is characterised in that, described 2nd optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described 2nd optical filter bandwidth equals light source spectrum width.
6. a kind of undersea cable real-time monitoring system according to claim 1, it is characterised in that, the monitoring method of described system specifically comprises the following steps:
Step 1: the single-mode fiber in photoelectric composite sea cable is accessed undersea cable real-time monitoring system as sensor fibre, or be wrapped on conventional ocean cable by communications optical cable to measure, the single-mode fiber in communications optical cable is accessed undersea cable real-time monitoring system as sensor fibre;
Step 2: undersea cable real-time monitoring system, to injected pulse light in single-mode fiber, produces Rayleigh scattering in single-mode fiber;
Step 3: the Rayleigh scattering light that undersea cable real-time monitoring system returns according to part different in single-mode fiber is with the phase place information of reflection spot place fl transmission light, it is achieved the monitoring of polarization state and phase place;
Step 4: polarization state and the phase place information being extracted Rayleigh scattering optical signal by undersea cable real-time monitoring system data acquisition and display unit, it is achieved the temperature that single-mode fiber is along the line and strain information monitoring;
Step 5: the running status being analyzed undersea cable by the change of temperature and strain, it is achieved the real time on-line monitoring of undersea cable.
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| CN104897301A (en) * | 2015-06-10 | 2015-09-09 | 贵州电网公司信息通信分公司 | Distributed optical fiber temperature alarm |
| CN106289390A (en) * | 2016-07-29 | 2017-01-04 | 江苏亨通高压电缆有限公司 | A kind of long length submarine cable production monitoring method |
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| CN107741203A (en) * | 2017-08-23 | 2018-02-27 | 国网福建省电力有限公司 | A kind of submarine cable strain monitoring system |
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| CN109374000B (en) * | 2018-11-12 | 2021-05-14 | 浙江大学 | High-precision real-time monitoring system for positioning and deformation of long-distance submarine cable |
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| CN112219373B (en) * | 2019-04-29 | 2022-08-30 | 华海通信技术有限公司 | Submarine cable fault judgment method and device |
| CN110492927B (en) * | 2019-09-27 | 2024-02-20 | 中国电子科技集团公司第三十四研究所 | Submarine optical cable disturbance monitoring system with relay based on shore-based detection |
| CN113358985A (en) * | 2021-05-17 | 2021-09-07 | 广东电网有限责任公司 | Insulation fault positioning system |
| CN113532303B (en) * | 2021-07-05 | 2022-09-23 | 浙江大学 | Device and method for testing strain position of object by using external strain |
| CN114216500B (en) * | 2021-11-29 | 2023-01-10 | 浙江大学 | Submarine cable high-precision intelligent health monitoring system |
| CN116781151B (en) * | 2023-08-18 | 2023-10-20 | 华海通信技术有限公司 | Spectrum detection method and system for submarine cable system |
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| CN101729141B (en) * | 2008-10-21 | 2013-06-05 | 华为技术有限公司 | Method and device for monitoring submarine cable system |
| CN202794431U (en) * | 2012-06-12 | 2013-03-13 | 李勇 | Submarine-cable fault monitoring device |
| CN102809713B (en) * | 2012-08-01 | 2015-06-03 | 国家电网公司 | Method for detecting broken point of submarine cable |
| CN102981104B (en) * | 2012-11-19 | 2015-03-11 | 中国能源建设集团广东省电力设计研究院 | On-line monitoring method for submarine cables |
| CN102997949B (en) * | 2012-12-18 | 2015-06-24 | 华北电力大学（保定） | Method used for measuring temperature and strain simultaneously and based on brillouin scattering |
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