CN103438982B - Shake monitoring system based on Brillouin distributed optical fiber sensing - Google Patents
Shake monitoring system based on Brillouin distributed optical fiber sensing Download PDFInfo
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- CN103438982B CN103438982B CN201310403757.0A CN201310403757A CN103438982B CN 103438982 B CN103438982 B CN 103438982B CN 201310403757 A CN201310403757 A CN 201310403757A CN 103438982 B CN103438982 B CN 103438982B
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Abstract
The invention discloses a shake monitoring system based on Brillouin distributed optical fiber sensing and belongs to the technical field of overhead cable safety monitoring. The system comprises a temperature and strain monitoring device based on a Brillouin light time domain analysis, and a plurality of shake sensors, wherein the temperature and strain monitoring device is composed of a semiconductor laser, an optical coupler, an electric light modulator, an acousto-optic modulator, a microwave frequency sweep device, a photoelectric detector, a data collection card and the like; the shake sensors are composed of rotation rods and counterweight blocks; the shake sensors are installed on the fault-prone points of a cable; and when the cable is shaken, the rotation rods connected with one end of a fiber drive the counterweight blocks to swing around the fiber, under the centrifugal effects, the rotation rods drive the surrounded fiber to generate a bending strain, a shaking state can be converted into the bending strain of the fiber and thus be detected by the Brillouin temperature and strain monitoring device. The shake monitoring system based on Brillouin distributed optical fiber sensing is suitable for on-line monitoring of the shaking state and the temperature of an overhead cable, the long-distance and distributed measuring is realized, the practicality and feasibility are high, the laying is flexible, and the cable safety monitoring is effectively realized.
Description
Technical field
The present invention relates to a kind of system that overground cable vibrating state is monitored, specifically be a kind of distributing optical fiber sensing based on Brillouin optical time domain analysis rock monitoring system.Belong to the safety monitoring technology field of overground cable.
Background technology
Along with growing continuously and fast of national economy, the use of overground cable is also increasing, and it is widely used in communal facility, large enterprise etc., for the development such as production, life, education, the military affairs providing source power of entire society.Just because of this, we propose more and more higher requirement to the safety and stability of electric system.In the world the safety monitoring of cable is also mainly rested in temperature aspect at present, from before temperature sensing cable formula thermometric, thermistor-type temp measuring system, to the distributed fiber Raman temp measuring system risen in recent years, all has some limitations.Such as traditional pyroelectric monitor mode can not show monitoring result in real time, wiring is complicated, maintenance is large, distributed fiber Raman temp measuring system can be determined the position that cable temperature carries out on-line monitoring and abnormity point, but but exists and can only carry out thermometric limitation.The generation of cable fault has two major reasons, being because cable itself or external environment reason cause the too high cable that causes of temperature fuse or puncture on the one hand, is the potential safety hazard caused because external force causes rocking of cable as sleet, strong wind weather etc. on the other hand.Above-mentioned first aspect can be monitored by existing several temperature monitoring system, and for the monitoring that cable rocks, said method but cannot realize.Since the eighties in last century, sensor-based system based on Brillouin optical time domain analysis commercial measurement temperature and strain information is proposed, brillouin distributed optical fiber sensing device is monitored because it can realize long distance, distributed temperature and strain simultaneously, and has characteristic that is corrosion-resistant, electromagnetism interference and obtain extensive concern always.It also has irreplaceable advantage relative to existing Raman distributed temp measuring system.
At present, brillouin distributed optical fiber sensing device is utilized to implement real-time vibrating state to overground cable and temperature monitoring faces some practical problemss, the vibrating state of such as cable is difficult to the dependent variable of direct corresponding optical fiber, how rocking of cable is converted into effective fibre strain information to carry out measurement be again a technical matters.
The patent No. is ZL200920026725.2, invent artificial Zhang Shunhai, Yin bright come, Gao Hongfeng, Zhang Weizhong, Liu Kun, Liu Zhengtang, denomination of invention be the utility model of " wireless aerial power cable contact temperature monitoring system ", discloses a kind of electric power overhead cable contact temperature monitoring system.This system adopts layered distribution type structure, is made up of acquisition layer, collecting layer and monitor layer; Acquisition layer comprises several wireless temperature measurement systems, and each wireless temperature measuring device is connected with testee; Collecting layer is several wireless receiving office terminals; Monitor layer is some local monitoring computers and at least one dispatching terminal monitoring computer and database, the temperature data that each respective wireless temperature measuring equipment collected sends is carried out data processing by wireless receiving office terminal, contact manager is passed to by mobile communication GPRS after process, contact manager passes to corresponding local monitoring computer and dispatching terminal monitoring computer, local monitoring computer and dispatching terminal monitoring computer manage data, send corresponding alerting signal.This utility model achieves the multi-point temperature measurement of electric power overhead cable to a certain extent, but also there is certain defect:
1. this monitoring system there is no another important sources of method monitoring cable security incident---rocking of cable.
2., by the management quantitative limitation of wireless receiving office terminal, this monitoring system is difficult to realize real distributed sensing for the measurement of temperature.
3. transmission of wireless signals is subject to adverse weather conditions, and anti-electromagnetic interference (EMI) aspect needs to be solved further.
Summary of the invention
The object of the invention is all cannot the problem of direct monitoring cable vibrating state for existing cable security monitoring system and traditional brillouin distributed optical fiber sensing device, design a kind of by by shake that dynamic sensor and brillouin distributed optical fiber sensing device combine can carry out temperature and vibrating state monitoring simultaneously a kind ofly rock monitoring system based on brillouin distributed optical fiber sensing.
Technical scheme of the present invention is as follows:
A kind ofly rock monitoring system based on brillouin distributed optical fiber sensing, comprise Brillouin's temperature and strain monitoring device and multiple rolling dynamic sensor, it is characterized in that Brillouin's temperature and strain monitoring device comprise semiconductor laser, optoisolator A, B, photo-coupler, acousto-optic modulator, Erbium-Doped Fiber Amplifier (EDFA), scrambler, Polarization Controller, electrooptic modulator, microwave swept frequency device, optical filter, sensor fibre, optical circulator A, B, Bragg grating, photodetector, data collecting card, signal generator, computing machine, before semiconductor laser is positioned at optoisolator A, photo-coupler is placed after optoisolator A, after optocoupler output, Polarization Controller is placed successively in a road, electrooptic modulator, optical filter, optoisolator B, acousto-optic modulator is placed on another road, optoisolator B is connected with No. 2 ports of optical circulator A through sensor fibre, acousto-optic modulator output terminal places Erbium-Doped Fiber Amplifier (EDFA), scrambler successively, and scrambler is connected with No. 1 port of optical circulator A through optical fiber, No. 1 port, No. 2 ports of optical circulator B are connected with No. 3 ports, the Bragg gratings of optical circulator A respectively through optical fiber, are connected to the input end of photodetector after its No. 3 ports export, the output terminal of photodetector is connected to the input end of data collecting card, and the output terminal of data collecting card is connected to computing machine, signal generator is connected with acousto-optic modulator and data collecting card respectively, microwave swept frequency device is connected with electrooptic modulator and data collecting card respectively.
The dynamic sensor that shakes comprises dwang and balancing weight, and dwang one end connects balancing weight, and the other end is fixed on sensor fibre.
The narrow linewidth laser that described semiconductor laser is, live width is 1.9MHz, wavelength 1550nm, and exporting continuous light power is 30mW.
Described optoisolator is the single-mode optics isolator of 1550nm wave band, and isolation is 30dB.
Described photo-coupler is the single-mode optics coupling mechanism of the 1*2 of 1:1.
Described acousto-optic modulator is the acousto-optic modulator of 1550nm, and it is 10ns that a road continuous light is modulated to pulsewidth, and repetition frequency is the pulsed light of 1KHz.
Pulsed light peak value after modulation is adjusted to more than Brillouin threshold by described Erbium-Doped Fiber Amplifier (EDFA).
Described scrambler is PCD-003 scrambler.
Described Polarization Controller is tricyclic Polarization Controller.
Described electrooptic modulator and microwave swept frequency type number are respectively KG-AM series 10G electrooptic modulator, HWS10120 type microwave swept frequency device, can modulate the shift frequency that another road continuous light produces about 10.65GHz.
The upper side band of the light after modulation filters out by described wave filter.
Described sensor fibre is 100Km single-mode fiber, and outside is polycarbonate cannula.
Described photodetector is PR-200M3035 type photodetector.
Described data collecting card is 150M single-channel data capture card.
Principle of work of the present invention is as follows: by semiconductor laser send continuous light incide optoisolator A, two-way light is divided into through 3dB photo-coupler, one road light is modulated to pulsed light through acousto-optic modulator, the repetition frequency of pulsed light and dutycycle control by driving the signal generator of acousto-optic modulator, then, the peak power of pulsed light is amplified by Erbium-Doped Fiber Amplifier (EDFA), then after scrambler, incides one end of sensor fibre as pump light, another Lu Guangxian controls as fixing polarization direction by Polarization Controller, the electrooptic modulator driven by microwave swept frequency device is again modulated to the light modulated that frequency shift amount equals microwave swept frequency device frequency, utilized bandwidth is less than the upper side band of the optical filter filtering light modulated of 0.1nm, incide the other end of sensor fibre again as flashlight after optoisolator B, microwave swept frequency device carries out frequency sweep in the frequency range of 10.6GHz-10.7GHz, flashlight and pump light meet in each position of optical fiber and produce Brillouin scattering dorsad, when the difference on the frequency of two-way light equals Brillouin shift amount, backscattering light intensity is maximum, by circulator and Bragg grating filtering ASE noise, again through photodetector and data collecting card collection signal, strength information and the frequency information of the detectable signal gathered are calculated as follows corresponding point temperature and strain information, and by the time that signal returns, each information is positioned.
ΔV
B=C
VεΔ
ε+CVTΔT(1)
ΔP
B/P
B(ε,T)=C
PεΔε+C
PTΔT(2)
Wherein, Δ V
bfor the knots modification of Brillouin shift, Δ T is the variable quantity of temperature, Δ
εfor strain variation amount, C
vTand C
pTfor temperature coefficient; C
v εand C
p εfor the coefficient of strain, P
bfor detection of optical power.This Brillouin's temperature and strain monitoring device are in harmonious proportion display section as the solution of whole system.
Sensor fibre in use, is laid along cable line by the present invention, and the multiple positions on the sensor fibre of cable end or its junction and the multiple position of other faults are installed and shaken dynamic sensors.When somewhere cable is stressed rock time, sensor fibre rocks thereupon, the dwang be connected with sensor fibre drives balancing weight to swing around sensor fibre, by centrifugal action, dwang drive balancing weight around sensor fibre produce bending strain, the amplitude of rocking like this and frequency can be converted into the bending strain of sensor fibre, thus are detected and demodulation by Brillouin's temperature and strain monitoring device.
Beneficial effect of the present invention is as follows:
1. the present invention can realize the monitoring for overground cable vibrating state, and simultaneously on-line monitoring cable each point temperature.
2. the present invention can realize long distance, distributed measurement, and compare classic method, it is longer that it measures length, and metrical information is more.
3. the present invention adopts the method for Fibre Optical Sensor to measure, and has corrosion-resistant, the advantage of electromagnetism interference.
4. of the present inventionly rock transferring structure, structure is simple, economical and practical.
Accompanying drawing explanation
Fig. 1 is the temperature based on Brillouin optical time domain analysis principle in the present invention and strain monitoring schematic diagram of device; Fig. 2 is the schematic diagram of rolling dynamic sensor; Fig. 3 is that cable rocks the schematic diagram causing the sensor fibre of band polycarbonate cannula to produce bending strain; Fig. 4 is the schematic diagram of system of the present invention in engineer applied.
In figure, each label is: 1, semiconductor laser, 2, optoisolator A, 3, photo-coupler, 4, acousto-optic modulator, 5, Erbium-Doped Fiber Amplifier (EDFA), 6, scrambler, 7, Polarization Controller, 8, microwave swept frequency device, 9, electrooptic modulator, 10 optical filters, 11, optoisolator B, 12, sensor fibre, 13, optical circulator A, 14, optical circulator B, 15, Bragg grating, 16, photodetector, 17, data collecting card, 18, signal generator, 19, computing machine; 20, cable, 21, the sensor fibre of band polycarbonate cannula, 22, dwang, 23, balancing weight, 24, sensor fibre virgin state, 25, cable rocks the sensor fibre caused and bend, 26, Brillouin's temperature and strain monitoring device, 27, shake dynamic sensor; 28, cable, 29, sensor fibre.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated, but be not limited thereto.
Embodiment:
As Figure 1-4, a kind ofly rock monitoring system based on brillouin distributed optical fiber sensing, comprise Brillouin's temperature and strain monitoring device 26 and multiple rolling dynamic sensor 27, it is characterized in that Brillouin's temperature and strain monitoring device 30 comprise semiconductor laser 1, optoisolator A2, B11, photo-coupler 3, acousto-optic modulator 4, Erbium-Doped Fiber Amplifier (EDFA) 5, scrambler 6, Polarization Controller 7, electrooptic modulator 9, microwave swept frequency device 8, optical filter 10, sensor fibre 12, optical circulator A13, B14, Bragg grating 15, photodetector 16, data collecting card 17, signal generator 18, computing machine 19, before semiconductor laser 1 is positioned at optoisolator A2, photo-coupler 3 is placed after optoisolator A2, after photo-coupler 3 output terminal, Polarization Controller 7 is placed on a road successively, electrooptic modulator 9, optical filter 10, optoisolator B11, acousto-optic modulator 4 is placed on another road, optoisolator B11 is connected with No. 2 ports of optical circulator A13 through sensor fibre 12, acousto-optic modulator 4 output terminal places Erbium-Doped Fiber Amplifier (EDFA) 5, scrambler 6 successively, and scrambler 6 is connected with No. 1 port of optical circulator A13 through optical fiber, No. 1 port of optical circulator B14, No. 2 ports are connected with No. 3 ports of optical circulator A13, Bragg grating 15 respectively through optical fiber, are connected to the input end of photodetector 16 after its No. 3 ports export, the output terminal of photodetector 16 is connected to the input end of data collecting card 17, and the output terminal of data collecting card 17 is connected to computing machine 19, signal generator 18 is connected with acousto-optic modulator 4 and data collecting card 17 respectively, microwave swept frequency device 8 is connected with electrooptic modulator 9 and data collecting card 17 respectively,
The dynamic sensor 27 that shakes comprises dwang 22 and balancing weight 23, and dwang 22 one end connects balancing weight 23, and the other end is fixed on the sensor fibre 21 of band polycarbonate cannula.
The narrow linewidth laser that described semiconductor laser is, live width is 1.9MHz, wavelength 1550nm, and exporting continuous light power is 30mW.
Described optoisolator is the single-mode optics isolator of 1550nm wave band, and isolation is 30dB.
Described photo-coupler is the single-mode optics coupling mechanism of the 1*2 of 1:1.
Described acousto-optic modulator is the acousto-optic modulator of 1550nm, and it is 10ns that a road continuous light is modulated to pulsewidth, and repetition frequency is the pulsed light of 1KHz.
Pulsed light peak value after modulation is adjusted to more than Brillouin threshold by described Erbium-Doped Fiber Amplifier (EDFA).
Described scrambler is PCD-003 scrambler.
Described Polarization Controller is tricyclic Polarization Controller.
Described electrooptic modulator and microwave swept frequency type number are respectively KG-AM series 10G electrooptic modulator, HWS10120 type microwave swept frequency device, can modulate the shift frequency that another road continuous light produces about 10.65GHz.
The upper side band of the light after modulation filters out by described wave filter.
Described sensor fibre is 100Km single-mode fiber, and outside is polycarbonate cannula.
Described photodetector is PR-200M3035 type photodetector.
Described data collecting card is 150M single-channel data capture card.
Claims (9)
1. one kind is rocked monitoring system based on brillouin distributed optical fiber sensing, comprise Brillouin's temperature and strain monitoring device and multiple rolling dynamic sensor, it is characterized in that Brillouin's temperature and strain monitoring device comprise semiconductor laser, optoisolator A, B, photo-coupler, acousto-optic modulator, Erbium-Doped Fiber Amplifier (EDFA), scrambler, Polarization Controller, electrooptic modulator, microwave swept frequency device, optical filter, sensor fibre, optical circulator A, B, Bragg grating, photodetector, data collecting card, signal generator, computing machine, before semiconductor laser is positioned at optoisolator A, photo-coupler is placed after optoisolator A, after optocoupler output, Polarization Controller is placed successively in a road, electrooptic modulator, optical filter, optoisolator B, acousto-optic modulator is placed on another road, optoisolator B is connected with No. 2 ports of optical circulator A through sensor fibre, acousto-optic modulator output terminal places Erbium-Doped Fiber Amplifier (EDFA), scrambler successively, and scrambler is connected with No. 1 port of optical circulator A through optical fiber, No. 1 port, No. 2 ports of optical circulator B are connected with No. 3 ports, the Bragg gratings of optical circulator A respectively through optical fiber, are connected to the input end of photodetector after these No. 3 ports export, the output terminal of photodetector is connected to the input end of data collecting card, and the output terminal of data collecting card is connected to computing machine, signal generator is connected with acousto-optic modulator and data collecting card respectively, microwave swept frequency device is connected with electrooptic modulator and data collecting card respectively,
The dynamic sensor that shakes comprises dwang and balancing weight, and dwang one end connects balancing weight, and the other end is fixed on sensor fibre.
2. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described semiconductor laser is narrow linewidth laser, live width is 1.9MHz, wavelength 1550nm, and exporting continuous light power is 30mW.
3. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described optoisolator A, B are the single-mode optics isolator of 1550nm wave band, isolation is 30dB.
4. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described photo-coupler is the single-mode optics coupling mechanism of the 1*2 of 1:1.
5. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described acousto-optic modulator is the acousto-optic modulator of 1550nm, a road continuous light is modulated to pulsewidth is 10ns, repetition frequency is the pulsed light of 1KHz.
6. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described scrambler is PCD-003 scrambler.
7. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described Polarization Controller is tricyclic Polarization Controller.
8. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described photodetector is PR-200M3035 type photodetector.
9. a kind ofly as claimed in claim 1 rock monitoring system based on brillouin distributed optical fiber sensing, it is characterized in that described data collecting card is 150M single-channel data capture card.
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| CN104089634B (en) * | 2014-07-07 | 2016-08-17 | 电子科技大学 | A kind of power transmission cable is waved and icing remote online monitoring system and monitoring method |
| CN105423944B (en) * | 2015-11-09 | 2018-11-09 | 华中科技大学 | A kind of distribution type fiber-optic curvature sensor |
| CN105371785B (en) * | 2015-11-13 | 2018-04-17 | 华中科技大学 | A kind of curvature measurement method |
| CN107860326B (en) * | 2017-10-23 | 2019-07-09 | 北京航空航天大学 | Single fiber many reference amounts integration sensing system for the monitoring of side slope deep deformation |
| CN109883534B (en) * | 2019-01-25 | 2021-08-27 | 北京航天计量测试技术研究所 | Micro-vibration sensor based on microwave interference and sensing method |
| CN112378428B (en) * | 2020-09-18 | 2022-05-31 | 云南电网有限责任公司昭通供电局 | Sag real-time monitoring device and method for ice melting through-flow process of optical fiber composite overhead ground wire |
| CN112461148B (en) * | 2020-10-19 | 2022-06-03 | 南京东智安全科技有限公司 | Distributed cooperative sensing device and method for structural strain monitoring |
| CN113340458A (en) * | 2021-07-30 | 2021-09-03 | 戎微(北京)技术有限公司 | Intelligent safety early warning system based on new generation distributed optical fiber sensing technology |
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| CN102168953B (en) * | 2011-01-12 | 2012-04-25 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102147236B (en) * | 2011-03-23 | 2012-09-26 | 南京大学 | Fully distributed optical fiber strain and vibration sensing method and sensor |
| CN102636217B (en) * | 2012-01-09 | 2017-01-11 | 武汉康特圣思光电技术有限公司 | Sensing device based on joint detection of Brillouin optical time domain analysis and Mach-Zehnder interference |
| CN203519150U (en) * | 2013-09-06 | 2014-04-02 | 山东大学 | Shake monitoring system based on Brillouin distributed optical fiber sensing |
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