CN201688928U - Enhanced type optical fiber Raman distributed sensing device - Google Patents
Enhanced type optical fiber Raman distributed sensing device Download PDFInfo
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- CN201688928U CN201688928U CN2010202210069U CN201020221006U CN201688928U CN 201688928 U CN201688928 U CN 201688928U CN 2010202210069 U CN2010202210069 U CN 2010202210069U CN 201020221006 U CN201020221006 U CN 201020221006U CN 201688928 U CN201688928 U CN 201688928U
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Abstract
The utility model discloses an enhanced type optical fiber Raman distributed sensing device comprising an optical fiber Raman demodulation device and an optical fiber sensing network, wherein the optical fiber Raman demodulation device is optically connected with one end of a sensing optical fiber in the optical fiber sensing network; and the optical fiber sensing network comprises a sensing optical fiber and an enhanced type Raman sensing optical fiber which are connected in series at interval to form the optical fiber sensing network. The enhanced type Raman sensing optical fiber is formed from the corrosion of hydrogen fluoride; and the outer surface of a coating layer is uniformly plated with a silver nanometer particle layer. As for the enhanced type optical fiber Raman distributed sensing device, the temperature sensing precision can achieve plus or minus 0.5 DEG, and spatial discrimination is smaller than 5m and even 1m; and the enhanced type optical fiber Raman distributed sensing device greatly lowers the detection difficulty of Raman signals and simultaneously improves the working efficiency of the system.
Description
Technical field
The utility model belongs to sensory field of optic fibre, relates to a kind of enhanced optical fiber Raman distributed sensing equipment.
Background technology
The fiber Raman effect is by incident light and fibre core interaction of molecules, the influence that fibre core microcosmic variable density and composition rise and fall and a kind of nonlinear fiber scattering effect of producing.India physicist Raman (Raman) has been found the inelastic scattering effect Raman scattering of light in medium, and therefore obtains Nobel Prize in physics.Signal light intensity that produces in the Raman scattering and sensing point temperature have particular kind of relationship, are to utilize light to produce the distributed intelligence that Raman scattering signal and optical time domain reflection technology obtain the temperature field when the Optical Fiber Transmission based on the distributed optical fiber temperature measurement technology of Raman scattering.
Utilize temperature-measuring range that the technology of Raman scattering thermometric can reach at-40 ℃～600 ℃, temperature measurement accuracy ± 2 ℃, spatial resolution 4m.But because Raman diffused light is very faint, to having relatively high expectations of Raman signal (FBG) demodulator.
HV CABLE SYSTEM is the most important also one of the most complicated ingredient in the urban public utilities, because its complex structure and system stability require height, the cable system status monitoring is a technology and a managerial difficult problem always.Utilize traditional Raman scattering effect, measuring accuracy is not high.The Raman signal of enhanced optical fiber Raman distributed sensor-based system is stronger, can monitor in real time effectively that cable temperature, shelf depreciation and insulation course are aging etc. influence the key factor that cable system moves.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, and a kind of enhanced optical fiber Raman distributed sensing equipment is provided.
A kind of enhanced optical fiber Raman distributed sensing equipment comprises fiber Raman (FBG) demodulator and optical fiber sensing network, and an end light of the sensor fibre in fiber Raman (FBG) demodulator and the optical fiber sensing network is connected;
Described optical fiber sensing network comprises sensor fibre and enhancement mode Raman sensor fibre, and sensor fibre and enhancement mode Raman sensor fibre compose in series optical fiber sensing network at interval.
Described enhancement mode Raman sensor fibre is formed by hydrogen fluoride corrosion, and the outside surface of covering evenly is coated with the silver nano-grain layer.
The power transmission line that sensor fibre and electric power transfer is online is close to, and key joints is close on enhancement mode Raman sensor fibre and the electric transmission network; The pulse laser of fiber Raman (FBG) demodulator outgoing is injected in the optical fiber sensing network, the laser of incident is propagated along sensor fibre, with the fibre core interaction of molecules, constantly produce the back to Raman diffused light, the back is received by the fiber Raman (FBG) demodulator to Raman diffused light, the moment that demodulation obtains according to the fiber Raman (FBG) demodulator is determined the position of sensor fibre reflection spot, and the light intensity that demodulation obtains according to the fiber Raman (FBG) demodulator is determined the temperature of sensor fibre reflection spot.
The utlity model has following beneficial effect: temperature measurement accuracy of the present utility model can reach ± and 0.5 ℃, spatial discrimination greatly reduces the work efficiency that the detection difficulty of Raman signal has also been improved system simultaneously less than 5m even below the 1m.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is an enhancement mode Raman sensor fibre enlarged diagram among Fig. 1.
Embodiment
As shown in Figure 1, a kind of enhanced optical fiber Raman distributed sensing equipment comprises fiber Raman (FBG) demodulator 1 and optical fiber sensing network 2, and the end light of the sensor fibre 2-1 in fiber Raman (FBG) demodulator 1 and the optical fiber sensing network 2 is connected; Raman sensing demodulator 1 is arranged in Central Control Room, can monitor many power transmission lines simultaneously, and monitoring distance can be selected 2km, 10km, 15km, even longer (multistage interconnected can accomplish the hundreds of kilometer).Sensor fibre 2-1 adopts ordinary optic fibre.
Optical fiber sensing network 2 comprises sensor fibre 2-1 and enhancement mode Raman sensor fibre 2-2, and sensor fibre 2-1 and enhancement mode Raman sensor fibre 2-2 compose in series optical fiber sensing network at interval.
As shown in Figure 2, enhancement mode Raman sensor fibre 2-2 is become through hydrogen fluoride corrosion by sensor fibre, and corrosion back fibre diameter d is 20um, and the outside surface of its covering 3 evenly is coated with the silver nano-grain layer 4 that thickness is 10nm.
In the work, the power transmission line that sensor fibre and electric power transfer is online is close to, and key joints is close on enhancement mode Raman sensor fibre and the electric transmission network, the aging undesired intensification that all can cause of the leakage of current of cable arbitrfary point or insulation course.The pulse laser of fiber Raman (FBG) demodulator outgoing is injected in the optical fiber sensing network, and the laser of incident is propagated along sensor fibre, with the fibre core interaction of molecules, constantly produces the back to Raman diffused light, and the back is received by the fiber Raman (FBG) demodulator to Raman diffused light.It is t that incident light turns back to the required time of optical fiber input end through backscattering, and the distance that laser pulse is passed by in optical fiber is 2L=vt.V is the speed that light is propagated in optical fiber, and v=C/n, C are the light velocity in the vacuum, and n is the refractive index of optical fiber.What measure constantly at t is from the back-scattering light for L place local from the optical fiber input end distance.The back is determined by sensor fibre reflection spot temperature to the Raman scattering light intensity.
Wherein, Δ υ is a Raman frequency shift, F (T)/F (T
0) value be the ratio of the voltage signal after the opto-electronic conversion.T
0Temperature during expression optical fiber sensing network operate as normal, T represents that the temperature when unusual takes place for measurand in the optical fiber sensing network, and F represents the system function of fiber Raman (FBG) demodulator, and h represents Planck's constant, and k represents Boltzmann constant.
What lay in the key point of cable monitoring system is enhancement mode Raman sensor fibre, silver nano-grain can produce very strong local electric field under the exciting of incident light, cause the plasma resonance on surface, inside of optical fibre produces nonlinear vibration, thereby has strengthened the intensity of Raman scattering.
During system works, it is 10ns that Raman sensing demodulator internal light source sends pulsewidth, repetition frequency is 1KHz, output power is the short pulse light of 10W, be transferred to the on-the-spot enhancement mode Raman temperature sensor of laying of monitoring through optical cable, at key position, as cable splice, switch cubicle joint, the cable connection point in each transformer station and up and down disconnecting link wait for that the monitoring point all correspondingly is distributed with enhancement mode Raman sensor fibre.
Optical fiber is near cable insulation, and when aging or leaky took place the cable insulation cover, insulation course was out of shape, and local temperature can raise, and the sensor fibre local temperature also changes thereupon.Sensor fibre turns back to the fiber Raman (FBG) demodulator with the Raman scattering signal, thereby demodulates the temperature value that Raman scattering signal after the enhancing obtains the trouble spot.
Claims (1)
1. an enhanced optical fiber Raman distributed sensing equipment comprises fiber Raman (FBG) demodulator and optical fiber sensing network, it is characterized in that: an end light of the sensor fibre in fiber Raman (FBG) demodulator and the optical fiber sensing network is connected;
Described optical fiber sensing network comprises sensor fibre and enhancement mode Raman sensor fibre, and sensor fibre and enhancement mode Raman sensor fibre compose in series optical fiber sensing network at interval;
Described enhancement mode Raman sensor fibre is formed through hydrogen fluoride corrosion by sensor fibre, and the outside surface of this Raman sensor fibre covering evenly is coated with the silver nano-grain layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202210069U CN201688928U (en) | 2010-06-08 | 2010-06-08 | Enhanced type optical fiber Raman distributed sensing device |
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| CN2010202210069U CN201688928U (en) | 2010-06-08 | 2010-06-08 | Enhanced type optical fiber Raman distributed sensing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280004A (en) * | 2011-05-26 | 2011-12-14 | 无锡圣敏传感科技有限公司 | Heat fire detector of high-sensitivity Raman sensing optical fiber |
| CN103323138A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring cables of power distribution network |
| CN103323139A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring OPGW running status |
| CN103916182A (en) * | 2011-12-26 | 2014-07-09 | 国家电网公司 | Online monitoring method for submarine communication optical fibers |
| CN112748101A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
| WO2022095615A1 (en) * | 2020-11-09 | 2022-05-12 | 南京南瑞继保电气有限公司 | Distributed optical fiber temperature measurement apparatus and method used for transformer temperature measurement |
-
2010
- 2010-06-08 CN CN2010202210069U patent/CN201688928U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280004A (en) * | 2011-05-26 | 2011-12-14 | 无锡圣敏传感科技有限公司 | Heat fire detector of high-sensitivity Raman sensing optical fiber |
| CN102280004B (en) * | 2011-05-26 | 2015-03-25 | 无锡圣敏传感科技有限公司 | Heat fire detector of high-sensitivity Raman sensing optical fiber |
| CN103916182A (en) * | 2011-12-26 | 2014-07-09 | 国家电网公司 | Online monitoring method for submarine communication optical fibers |
| CN103916182B (en) * | 2011-12-26 | 2016-08-24 | 国家电网公司 | Submarine communication optical fiber monitoring method |
| CN103323138A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring cables of power distribution network |
| CN103323139A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring OPGW running status |
| WO2022095615A1 (en) * | 2020-11-09 | 2022-05-12 | 南京南瑞继保电气有限公司 | Distributed optical fiber temperature measurement apparatus and method used for transformer temperature measurement |
| CN112748101A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
| CN112748101B (en) * | 2020-12-29 | 2024-05-10 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
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Granted publication date: 20101229 Termination date: 20140608 |