CN103513147A - Submarine cable real-time monitoring system and submarine cable real-time monitoring method - Google Patents
Submarine cable real-time monitoring system and submarine cable real-time monitoring method Download PDFInfo
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Abstract
The invention discloses a submarine cable real-time monitoring system and a submarine cable real-time monitoring method in the technical field of measurement. According to the technical scheme, the submarine cable real-time monitoring system is designed, the temperature and the strain of a submarine cable in the operation process are achieved by detecting the polarization state and the phase of backward Rayleigh scattering light, and therefore real-time monitoring of state information of external damage, insulation degradation, electric leakage, ground faults and the like is achieved. The utilization rate of equipment is improved, the monitoring cost is reduced, and in addition, the missing report rate and the false judging rate are greatly reduced. Three-dimensional, large-range, whole-circuit and networked real-time monitoring of the submarine cable can be achieved, and the submarine cable real-time monitoring system and the submarine cable real-time monitoring method are of great significance in safe and stable operation of the submarine cable.
Description
Technical field
The invention belongs to field of measuring technique, relate in particular to a kind of subsea cable real-time monitoring system and monitoring method.
Background technology
China shore line reaches 3.2 ten thousand kilometers, large small island has more than 6500, approximately 4,730,000 square kilometres of territorial waters areas, offshore work platform is numerous, and subsea cable is remote power feeding, high voltage power transmission, power communication, signal transmission, the productive life that guarantees islander and normal in service the playing a crucial role of offshore work platform.
Owing to being subject to the factors such as the washing away of seawater, erosion, easily cause insulation ag(e)ing, the block-water performance variation of subsea cable, make subsea cable produce leakage current, thereby cause subsea cable to raise in the temperature at place, trouble spot, and then cause larger fault, for example: ground short circuit fault etc.The variation of subsea cable load current, also can make the temperature of subsea cable change, it is the operation conditions that the variation of subsea cable temperature can reflect subsea cable, for subsea cable is moved in the temperature range of safety, extend subsea cable serviceable life, be necessary subsea cable health status to carry out daily monitoring maintenance.
Increase day by day along with ocean exploitation activity, cultivation in marine site, fishing net, ship anchor etc. can not be ignored the impact of extra large cable operation, and under traditional approach, fallen anchor, cast anchor, fishery is fished for, ship pulls, bank base operation etc. cannot early warning while destroying, confirmation and disconnected cable head to the accurate location of accident point and accident ship are salvaged difficulty, have affected accident maintenance and adjustment of loss.Therefore study new method, the new tool of subsea cable health monitoring, for guaranteeing power network safety operation, build strong intelligent grid and have very important significance.
In subsea cable monitoring system, traditional optical time domain reflectometer (OTDR) utilizes the Rayleigh scattering signal dorsad that light transmits generation in optical fiber to carry out extra large cable localization of fault, but this technology can only detect after extra large cable is destroyed generation fracture by infringement event, cannot realize the real time on-line monitoring of infringement event.Light time territory dorsad Raman scattering distributed fiberoptic sensor (ROTDR) utilizes the signal measurement of the Raman scattering dorsad optical fiber Temperature Distribution along the line in multimode optical fiber, cannot realize strain measurement, therefore this technology can only realize the on-line monitoring of extra large cable temperature information, cannot carry out on-line monitoring to strain events such as the anchor that falls, ship towings.Therefore, subsea cable is in the urgent need to a kind of effective realtime on-line monitoring method.
Summary of the invention
For realizing temperature in extra large cable operational process and the on-line monitoring problem of strain in traditional subsea cable monitoring system of mentioning in background technology, the present invention proposes a kind of subsea cable real-time monitoring system and monitoring method.
A kind of subsea 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, pulse producer, the first isolator, the first erbium-doped optical fiber amplifier EDFA, the second isolator, the first optical filter, circulator, the polarizer, sensor fibre, the second coupling mechanism, the second erbium-doped optical fiber amplifier EDFA, analyzer, the 3rd isolator, the second optical filter, the first photoelectric detector, the second 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 isolator, the first erbium-doped optical fiber amplifier EDFA, the second isolator, the first optical filter, circulator, the polarizer are connected in turn with sensor fibre; Described narrow spectrum light source is for generation of narrow spectrum light; The effect of described the first coupling mechanism is that the laser pulse of laser instrument transmitting is coupled into Polarization Controller PC; Described electrooptic modulator EOM is for modulating pulse light; Described the first isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; Described the first erbium-doped optical fiber amplifier EDFA amplifies for paired pulses light; Described the second isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; The spontaneous emission noise that described the first optical filter is introduced to system for filtering the first erbium-doped optical fiber amplifier EDFA; The effect of the described polarizer is to convert normal optical signal to linearly polarized light;
Described pulse producer is connected with electrooptic modulator EOM with described clock control cell respectively; Described pulse producer, for generation of pulse signal, is modulated narrow spectrum light by electrooptic modulator EOM, makes it become pulsed light;
Described clock control cell is connected with data acquisition and display unit with described narrow spectrum light source respectively; Described data acquisition and display unit is used for extracting polarization state and the phase information of Rayleigh scattering light signal, and calculates and show;
Described the second coupling mechanism is connected with analyzer with described circulator, the second erbium-doped optical fiber amplifier EDFA respectively; Described the second coupling mechanism is that Rayleigh scattering signal is dorsad divided into two-way; Described the second erbium-doped optical fiber amplifier EDFA amplifies for the light receiving; Described analyzer is for detection of polarization state;
Described the second erbium-doped optical fiber amplifier EDFA, the 3rd isolator, the second optical filter, the first photoelectric detector are connected in turn with data acquisition and display unit; Described the 3rd isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; Described the first photoelectric detector is for becoming electric signal by the light signal receiving;
Described analyzer, the second photoelectric detector and data acquisition and display unit are connected in turn; Described the second photoelectric detector is for becoming electric signal by the light signal receiving.
Described narrow spectrum light source spectrum width is 3kHz～12.5GHz.
The Laser Modulation that described system adopts the mode of modulation indirectly that narrow spectrum light source is produced becomes pulsed light.
Described the first optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described the first optical filter bandwidth equals light source spectrum width.
Described the second optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described the second optical filter bandwidth equals light source spectrum width.
A method of real-time, is characterized in that, described method specifically comprises the following steps:
Step 1: the access subsea cable real-time monitoring system using the single-mode fiber in described photoelectric composite sea cable as sensor fibre, or communications optical cable is wrapped on common subsea cable and is measured, the access subsea cable real-time monitoring system using the single-mode fiber in communications optical cable as sensor fibre;
Step 2: subsea 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 subsea cable real-time monitoring system returns according to different piece in single-mode fiber, with the phase information of reflection spot place fl transmission light, is realized the monitoring of polarization state and phase place;
Step 4: extract polarization state and the phase information of Rayleigh scattering light signal by subsea cable real-time monitoring system data acquisition and display unit, realize single-mode fiber temperature along the line and strain information monitoring;
Step 5: analyze the running status of subsea cable by the variation of temperature and strain, realize the real time on-line monitoring of subsea cable.
The invention has the beneficial effects as follows, by detecting polarization state and the phase place of Rayleigh scattering light dorsad, realize temperature and the strain in subsea cable operational process, thereby realize the Real-Time Monitoring of the status informations such as extraneous destruction, insulation degradation, electric leakage, earth fault.The utilization factor that has not only improved equipment, has reduced monitoring cost, has also significantly reduced rate of failing to report and False Rate, can realize three-dimensional to extra large cable, on a large scale, road, networking Real-Time Monitoring completely, significant to the safe and stable operation of subsea cable.
Accompanying drawing explanation
Fig. 1 is the connection layout of employing subsea cable real-time monitoring system on-line monitoring subsea cable status information provided by the invention; Wherein, the measurement connection layout that a is photoelectric composite sea cable; B is for to be wrapped in by communications optical cable the connection layout of measuring on common subsea cable;
Fig. 2 is the structural drawing of subsea cable real-time monitoring system provided by the invention;
Wherein, 1-subsea cable real-time monitoring system; 2-photoelectric composite sea cable; Compound single-mode fiber in 3-photoelectric composite sea cable; The common subsea cable of 4-; Single-mode fiber in 5-communications optical cable; 6-the first coupling mechanism; 7-the first isolator; 8-the second isolator; 9-circulator; The 10-polarizer; 11-Fiber Bragg Grating FBG; 12-the 3rd isolator; 13-sensor fibre; 14 second coupling mechanisms.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 1 is the connection layout of employing subsea cable real-time monitoring system on-line monitoring subsea cable status information provided by the invention; Wherein, the measurement connection layout that a is photoelectric composite sea cable, subsea cable real-time monitoring system 1 is directly connected with single-mode fiber 3 compound in photoelectric composite sea cable 2; B is for to be wrapped in by communications optical cable the connection layout of measuring on common subsea cable, and subsea cable real-time monitoring system 1 is connected with the single-mode fiber 5 in communications optical cable.
Fig. 2 is the structural drawing of subsea cable real-time monitoring system provided by the invention.In Fig. 2, Rayleigh scattering light phase-detection General Requirements spectrum width is very narrow, adopts super-narrow line width laser instrument.Because if laser instrument spectrum width is larger, the laser pulse of generation just contains various spectrum components, when the Rayleigh back scattering of these signals arrives detector simultaneously, can launch stack, rather than the interference of super-narrow line width laser instrument.Select applicable semiconductor laser as light source, detect when realizing Rayleigh scattering light phase and polarization state simultaneously, need carefully to select light source spectrum width, spectrum width must be selected between 3kHz～12.5GHz, both can guarantee that interference effect occurred, interference effect can not be flooded too by force and completely the effect of polarization state modulation simultaneously.
In order to realize profile, measure, need to be to sensor fibre injected pulse light, this system becomes pulsed light by the mode of indirect modulation by Laser Modulation.Clock control cell triggers narrow spectrum light source, it is produced and be applicable to the narrow spectrum light that system detects.Meanwhile, clock control cell trigger generator, pulse producer is started working, and produces the pulse signal that meets system requirements, and this pulse signal removes to modulate narrow spectrum light by electrooptic modulator, makes it become pulsed light.In order to prevent that this pulsed light reverse transfer from causing damage to narrow spectrum light source, add the first isolator, guarantee pulsed light one-way transmission in optical fiber.Continuous light is modulated into after pulsed optical signals, luminous power is lower, need to amplify through the first erbium-doped optical fiber amplifier EDFA, the first erbium-doped optical fiber amplifier EDFA can be introduced spontaneous emission noise to system, need to through bandwidth, equal first this noise signal of optical filter filtering of light source spectrum width, this optical filter is comprised of optical circulator and Fiber Bragg Grating FBG.Pulsed light after denoising is injected in sensor fibre by the c mouth of circulator.Light transmits in optical fiber, can produce Rayleigh scattering, occur in Rayleigh scattering signal dorsad along optical fiber reverse transfer, arrive the d mouth of circulator, scattered light one-way transmission in circulator is exported by e mouth, and the back-scattering light of output is divided into two-way through the f of coupling mechanism mouth equal proportion.The second coupling mechanism g mouth light signal is directly sent into the first photoelectric detector and is carried out opto-electronic conversion after the second erbium-doped optical fiber amplifier EDFA amplification filtering, and coupling mechanism h mouth light signal is converted into electric signal by the second photoelectric detector again after an analyzer detects polarization state.Due to identical with fl transmission polarisation of light state at reflection spot place scattered light, therefore Rayleigh scattering light just carries scattering point place fl transmission polarisation of light information dorsad, therefore by detecting polarization information, just can know the status information at this scattering point place.Simultaneously, the Rayleigh scattering light that different piece is returned from optical fiber is equally with the phase information of reflection spot fl transmission light, after interference effect, this restraints the watt level of Rayleigh scattering light dorsad also can be subject to the modulation of phase place, become the fluctuation that has certain rule, therefore by detected phase information, just can know the status information at this scattering point place.Clock control cell controls data acquisition and display unit gathers two ways of optical signals and carries out the processing such as denoising, extracts polarization state and the phase information of Rayleigh scattering light signal, thereby realizes optical fiber temperature along the line and strain information monitoring.Finally by the variation of temperature and strain, analyze the running status of extra large cable, thereby realize the real time on-line monitoring of subsea cable.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in 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 subsea 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, pulse producer, the first isolator, the first erbium-doped optical fiber amplifier EDFA, the second isolator, the first optical filter, circulator, the polarizer, sensor fibre, the second coupling mechanism, the second erbium-doped optical fiber amplifier EDFA, analyzer, the 3rd isolator, the second optical filter, the first photoelectric detector, the second 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 isolator, the first erbium-doped optical fiber amplifier EDFA, the second isolator, the first optical filter, circulator, the polarizer are connected in turn with sensor fibre; Described narrow spectrum light source is for generation of narrow spectrum light; The effect of described the first coupling mechanism is that the laser pulse of laser instrument transmitting is coupled into Polarization Controller PC; Described electrooptic modulator EOM is for modulating pulse light; Described the first isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; Described the first erbium-doped optical fiber amplifier EDFA amplifies for paired pulses light; Described the second isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; The spontaneous emission noise that described the first optical filter is introduced to system for filtering the first erbium-doped optical fiber amplifier EDFA; The effect of the described polarizer is to convert normal optical signal to linearly polarized light;
Described pulse producer is connected with electrooptic modulator EOM with described clock control cell respectively; Described pulse producer, for generation of pulse signal, is modulated narrow spectrum light by electrooptic modulator EOM, makes it become pulsed light;
Described clock control cell is connected with data acquisition and display unit with described narrow spectrum light source respectively; Described data acquisition and display unit is used for extracting polarization state and the phase information of Rayleigh scattering light signal, and calculates and show;
Described the second coupling mechanism is connected with analyzer with described circulator, the second erbium-doped optical fiber amplifier EDFA respectively; Described the second coupling mechanism is that Rayleigh scattering signal is dorsad divided into two-way; Described the second erbium-doped optical fiber amplifier EDFA amplifies for the light receiving; Described analyzer is for detection of polarization state;
Described the second erbium-doped optical fiber amplifier EDFA, the 3rd isolator, the second optical filter, the first photoelectric detector are connected in turn with data acquisition and display unit; Described the 3rd isolator is used for preventing that pulsed light reverse transfer from causing damage to narrow spectrum light source, guarantees pulsed light one-way transmission; Described the first photoelectric detector is for becoming electric signal by the light signal receiving;
Described analyzer, the second photoelectric detector and data acquisition and display unit are connected in turn; Described the second photoelectric detector is for becoming electric signal by the light signal receiving.
2. a kind of subsea cable real-time monitoring system according to claim 1, is characterized in that, described narrow spectrum light source spectrum width is 3kHz～12.5GHz.
3. a kind of subsea cable real-time monitoring system according to claim 1, is characterized in that, the Laser Modulation that described system adopts the mode of modulation indirectly that narrow spectrum light source is produced becomes pulsed light.
4. a kind of subsea cable real-time monitoring system according to claim 1, is characterized in that, described the first optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described the first optical filter bandwidth equals light source spectrum width.
5. a kind of subsea cable real-time monitoring system according to claim 1, is characterized in that, described the second optical filter comprises optical circulator and Fiber Bragg Grating FBG; Described the second optical filter bandwidth equals light source spectrum width.
6. a subsea cable method of real-time, is characterized in that, described method specifically comprises the following steps:
Step 1: the access subsea cable real-time monitoring system using the single-mode fiber in described photoelectric composite sea cable as sensor fibre, or communications optical cable is wrapped on common subsea cable and is measured, the access subsea cable real-time monitoring system using the single-mode fiber in communications optical cable as sensor fibre;
Step 2: subsea 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 subsea cable real-time monitoring system returns according to different piece in single-mode fiber, with the phase information of reflection spot place fl transmission light, is realized the monitoring of polarization state and phase place;
Step 4: extract polarization state and the phase information of Rayleigh scattering light signal by subsea cable real-time monitoring system data acquisition and display unit, realize single-mode fiber temperature along the line and strain information monitoring;
Step 5: analyze the running status of subsea cable by the variation of temperature and strain, realize the real time on-line monitoring of subsea 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 |
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| CN107289978A (en) * | 2017-06-09 | 2017-10-24 | 南京大学 | A kind of system and method for the survey disturbance based on POTDR |
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| CN109443228A (en) * | 2018-11-16 | 2019-03-08 | 中国电力科学研究院有限公司 | Submarine cable armoring layer deformation monitoring system, device and method |
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| CN114216500A (en) * | 2021-11-29 | 2022-03-22 | 浙江大学 | Submarine cable high-precision intelligent health monitoring system |
| CN114216500B (en) * | 2021-11-29 | 2023-01-10 | 浙江大学 | Submarine cable high-precision intelligent health monitoring system |
| CN116781151A (en) * | 2023-08-18 | 2023-09-19 | 华海通信技术有限公司 | Spectrum detection method and system for submarine cable 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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