CN106940228A - A kind of intelligent cable on-line monitoring system and monitoring method - Google Patents
A kind of intelligent cable on-line monitoring system and monitoring method Download PDFInfo
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- CN106940228A CN106940228A CN201710284342.4A CN201710284342A CN106940228A CN 106940228 A CN106940228 A CN 106940228A CN 201710284342 A CN201710284342 A CN 201710284342A CN 106940228 A CN106940228 A CN 106940228A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000013307 optical fiber Substances 0.000 claims abstract description 66
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000011162 core material Substances 0.000 claims description 60
- 239000011810 insulating material Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 210000005239 tubule Anatomy 0.000 claims description 10
- 210000002615 epidermis Anatomy 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000001069 Raman spectroscopy Methods 0.000 claims description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 6
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 230000005693 optoelectronics Effects 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000004079 fireproofing Methods 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- -1 internal shield Substances 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
- G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
本发明涉及一种智能电缆在线监测系统及监测方法，包括单芯电缆、一号光纤、二号光纤、光电转换装置，光电转换装置包括：一号光电转换器、二号光电转换器、报警器。本发明将两条光纤分别安装于在单芯电缆表皮外对称位置，其中一号光纤用于电缆温度测量，其中二号光纤用于电缆受外力测量，同时在电缆隧道中每隔一定距离安装烟雾探测器。该系统可同时监测4条地铁电缆线路的状态信息，四条电缆采用三角形敷设方式，本发明通过在地铁电缆外置光纤，实现了地铁电缆各点的温度测定、受外力检测、火情报警的功能，并通过光纤的弯折敷设，实现了一套系统监测多条光纤的功能，对地铁电缆故障检测与防火防盗报警等方面提供实现依据。
The invention relates to an intelligent cable online monitoring system and monitoring method, including a single-core cable, No. 1 optical fiber, No. 2 optical fiber, and a photoelectric conversion device. The photoelectric conversion device includes: No. 1 photoelectric converter, No. 2 photoelectric converter, and an alarm . In the present invention, two optical fibers are respectively installed at symmetrical positions outside the skin of the single-core cable, wherein No. 1 optical fiber is used for cable temperature measurement, and No. 2 optical fiber is used for cable external force measurement. detector. The system can monitor the state information of four subway cable lines at the same time, and the four cables are laid in a triangle. The invention realizes the functions of temperature measurement, external force detection, and fire alarm at each point of the subway cable by placing optical fibers outside the subway cables. , and through the bending and laying of optical fibers, the function of a system to monitor multiple optical fibers is realized, which provides a basis for the detection of subway cable faults and fire and anti-theft alarms.
Description
Technical field
The invention belongs to field of cables, it is related to a kind of intelligent cable on-line monitoring system and monitoring method.
Background technology
At this stage, subway is because its reliability is high, carrying capacity is strong, it is all to transport substantial amounts of crowd etc. in the very short time
Many advantages are just developed rapidly, and because subway operates in underground completely, how over the ground the illumination of train driving and platform is required for electricity consumption,
Iron system is stable, reliable power supply, and the very first time determines that abort situation overhaul with regard to aobvious when supply line breaks down
Obtain particularly important.During subway power supply, mainly using 35kV, 10kV ac cable.Above-mentioned cable is mainly placed in cable
Ditch or using direct buried, its most immediate cause broken down in the process of running is insulation reduction and breakdown, and is caused
The factor of insulation breakdown mainly has：External force damage, running overload, ambient temperature effect and cogging problem, electricity from the point of view of summarizing
The reason for cable breaks down mainly is influenceed by external force with temperature,
At this stage, Cable fault examination is mainly temperature detection and burglar alarm.It is widely used in temperature detection
Technology has thermocouple temperature measurement and optical fiber temperature-measurement.The principle of thermocouple temperature measurement is that the resistance of thermocouple can be with the change of temperature
Change, is converted to electric signal, and measure with this by the signal of temperature.Thermocouple temperature measurement is simple in construction, cheap, technology
Maturation, but because thermocouple can only carry out point type thermometric, it is impossible to enter the on-line monitoring of trip temperature to whole piece cable run, so tool
There is certain limitation.Optical fiber have it is with low cost, not by electromagnetic interference, small in volume, measurement accuracy is high, be easy to lay
The advantages of, distributed optical fiber temperature measurement technology achieves that the circuit of logarithm kilometer carries out long term monitoring, existing rank using an optical fiber
Laboratory stage being rested on section optical fiber temperature-measurement cable, practical application is less more.Existing optical fiber temperature-measurement cable is mainly to cable
Detected joint.It is primarily present problems with：
(1) Metro Cable temperature raises main stand under load flow effect, and current-carrying capacity rise can cause the temperature rise of cable many places,
Thermometric only is carried out to cable connector part and there is potential safety hazard；
(2) Metro Cable lays environment complexity, and optical fiber is exposed to be easy to be corroded；
(3) temperature rise, the function of being alarmed by stress can not be realized simultaneously.
Accordingly, it would be desirable to which a kind of new technical scheme solves the above problems.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of intelligent cable on-line monitoring system, by subway
Cable external optical fiber, realizes the temperature measuring of Metro Cable each point, is detected by external force, the function of condition of a fire alarm, and passes through light
Fine bending is laid, and the function that set of system monitors a plurality of optical fiber is realized, to Metro Cable fault detect and fire-proof and theft-proof report
There is provided in terms of police and realize foundation.
The technical solution adopted in the present invention is：
A kind of intelligent cable on-line monitoring system, it is characterised in that including single-core cable, be arranged on outside single-core cable epidermis
A number optical fiber in portion and No. two optical fiber, while the photoelectric conversion device being connected with an optical fiber and No. two optical fiber, and and photoelectricity
At least two tubules are provided with outside the computer system of conversion equipment connection, the single-core cable epidermis, with single-core cable
The heart is symmetrical arranged, and an optical fiber and No. two optical fiber are individually positioned in tubule, and the epidermis of single-core cable is uniformly provided with some micro-
Type support, tubule is fixed on miniature support.
In a kind of above-mentioned intelligent cable on-line monitoring system, described photoelectric conversion device is installed on the single-core cable
The initial segment, including：A number optical-electrical converter, No. two opto-electronic conversions and alarm, a described optical-electrical converter with it is described
The connection of number optical fiber, can launch optical signal and receive the scattered light signal of setting, described No. two optical-electrical converters with it is described
No. two optical fiber connection, optical signal can be launched and the scattered light signal of setting is received；A described optical-electrical converter and institute
The alarm electrical connection stated, realizes that cable temperature rise is alarmed by the way that electric signal is delivered into described alarm；A described light
Electric transducer is electrically connected with No. two described optical-electrical converters, and temperature information can be delivered to No. two described optical-electrical converters；
No. two described optical-electrical converters are electrically connected with described alarm, and electricity is realized by the way that electric signal is delivered into described alarm
Cable stress is alarmed.
In a kind of above-mentioned intelligent cable on-line monitoring system, described single-core cable takes triangle system of laying, No. one
Optical fiber, No. two optical fiber are bent in described single-core cable end with the radius of curvature set, for the single-core cable described in next
Use；Single-core cable includes：Core, internal shield, insulating material layer, external shielding layer, protective case, corrosion-resistant coating；Core is copper
Line or aluminum steel；Insulating material layer is surrounded on outside described core and described internal shield；Internal shield is surrounded on the line
Wicking surface, with the core equipotential, prevents shelf depreciation between core and the insulating material layer；External shielding layer is surround
In the megohmite insulant layer surface, prevent from producing shelf depreciation between insulating material layer and protective case, protective case is surrounded on external screen
Cover layer surface.
In a kind of above-mentioned intelligent cable on-line monitoring system, described core material is copper cash or aluminum steel, and electric conductivity is good
It is good；Described insulating material layer material is crosslinked polyethylene, and insulating properties are good, and described internal shield is by semi-conducting material structure
Into the external shielding layer is made up of semi-conducting material, and described protective case uses not halogen crosslinked polyethylene fire proofing；It is micro-
Type support is consistent with described single-core cable and jacket material.
In a kind of above-mentioned intelligent cable on-line monitoring system, a described optical fiber can not with No. two described fiber lengths
More than 40 kms, survey every section of single-core cable length and must not exceed 10 kms, described single-core cable end, described No. one
Optical fiber is bent with No. two described optical fiber with five to six centimetres of radius of curvature, and is passed through thin on next single-core cable
Pipe.The on-line monitoring of the single-core cable described in 4 can be realized simultaneously.
A kind of intelligent cable on-line monitoring method, it is characterised in that：Including：
Step 1, an optical-electrical converter uses Raman scattering setting means, on the one hand by the temperature information collected
The alarm is delivered to, each point temperature information is on the other hand delivered to No. two optical-electrical converters；Described Raman scattering is former
Reason is to reflect temperature by the Stokes luminous intensity and anti-Stokes luminous intensity in collection of scattered light, can use equation below
It is derived from：
The sub- frequency of Stokes ratio is：
vs=v0-Δv (0.1)
Anti-Stokes scattering photon equilibrium state photon frequency is：
vs=v0+Δv (0.2)
In formula, Δ v is Raman Phonon frequency, v0For incident photon frequency；
If R (T) is the ratio of above two scattered light intensity, it is shown below：
In formula, h is Planck's constant, and k is Boltzmann constant, and T is absolute temperature；
Optical fiber top is chosen as reference optical fiber, temperature is T0, then treat that testing temperature T is：
Step 2, No. two optical-electrical converters use Brillouin scattering setting means, by the way that a described photoelectricity is turned
The temperature that the temperature information of parallel operation conveying is collected with itself will obtain being believed by external force with being carried out difference processing by outer force information
Breath is delivered to the alarm；Described Brillouin scattering principle is the frequency shift amount by gathering light, is shown below：
ΔvB=CvεΔε+CvTΔT (0.5)
Δ v in formulaBIt is Brillouin's frequency knots modification, Δ ε is dependent variable, and Δ T is temperature variation, for what is used herein
Under 1550nm light source, normal temperature, Brillouin's coefficient of strain is generally Cvε=0.0493MHz/ μ ε Brillouin's temperatures coefficient are generally
CvT=1.2MHz/ DEG C；
The temperature that step 1 is obtained substitutes into formula 1.5, you can obtain strain value.
Therefore the invention has the advantages that：By in Metro Cable external optical fiber, realizing the temperature of Metro Cable each point
Degree is determined, detected by external force, the function of condition of a fire alarm, and is laid by the bending of optical fiber, realizes set of system monitoring a plurality of
The function of optical fiber, foundation is realized to being provided in terms of Metro Cable fault detect and fire-proof and theft-proof alarm.
Brief description of the drawings
Fig. 1 is external structure schematic diagram of the invention.
Fig. 2 is sectional view of the invention.
Fig. 3 is overhead cabling method figure of the invention.
Fig. 4 is fibre optic installations schematic diagram of the invention.
Fig. 5 is overall schematic of the present invention.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with the accompanying drawings and embodiment is to this hair
It is bright to be described in further detail, it will be appreciated that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
See Fig. 1, a kind of intelligent cable on-line monitoring system that the present invention is provided, including single-core cable 1, optical fiber 2,
No. two optical fiber 3, photoelectric conversion device 4, tubule 9 and miniature support 10.Described photoelectric conversion device 4 is installed on the single electricity
The initial segment of cable 1, including：A number optical-electrical converter 5, No. two optical-electrical converters 6 and alarm 7, a described opto-electronic conversion
Device 5 is connected with a described optical fiber 2, can be launched optical signal and be received the scattered light signal of setting, No. two described photoelectricity
Converter 6 is connected with No. two described optical fiber 3, can be launched optical signal and be received the scattered light signal of setting.Described No. one
Optical-electrical converter 5 is electrically connected with described alarm 7, and cable temperature rise is realized by the way that electric signal is delivered into described alarm 7
Alarm；A described optical-electrical converter 5 is electrically connected with No. two described optical-electrical converters 6, and temperature information can be delivered to institute
No. two optical-electrical converters stated.No. two described optical-electrical converters 6 are electrically connected with described alarm 7, by the way that electric signal is defeated
Deliver to described alarm 7 and realize that cable stress is alarmed.Described miniature support 10 is installed on the epidermis of described single-core cable 1
On, counted from the initial segment and put one every 100 meter amperes, described miniature support 10 and the described jacket material of single-core cable 1
Unanimously.
See Fig. 2, described single-core cable 1 includes：Core 11, internal shield 12, megohmite insulant 13, external shielding layer 14,
Protective case 15, corrosion-resistant coating 16.The described material of core 11 is copper cash or aluminum steel, and electric conductivity is good.Described megohmite insulant
13 materials are crosslinked polyethylene, and insulating properties are good, are surrounded on outside described core 11 and described internal shield 12.It is described
Internal shield 12 be made up of semi-conducting material, be surrounded on the surface of core 11, and the equipotential of core 11 prevents described
Occurs shelf depreciation between core 11 and the megohmite insulant 13.The external shielding layer 14 is made up of semi-conducting material, is surrounded on
The surface of megohmite insulant 13, prevents from producing shelf depreciation between megohmite insulant 13 and protective case 15, described protective case 15 is adopted
With not halogen crosslinked polyethylene fire proofing.Described tubule 9 is fixed on described miniature support 10, a described light
Fibre 2, No. two optical fiber 3 are positioned over inside described tubule 9.
See Fig. 3, described single-core cable 1 uses triangle system of laying, because need to consider an optical fiber 2 with
The position of No. two optical fiber 3, described single-core cable 1 between layer with needing to leave certain interval, this gap and described capillary diameter
It is equal.
See Fig. 4, to ensure measurement accuracy, a described optical fiber 2 may not exceed 40 with No. two described length of optical fiber 3
Km, surveys every section of length of single-core cable 1 and must not exceed 10 kms, in the described end of single-core cable 1, a described optical fiber
2 are bent with No. two described optical fiber 3 with five to six centimetres of radius of curvature, and are passed through thin on next single-core cable 1
Pipe 9.The on-line monitoring of the single-core cable 1 described in 4 can be realized simultaneously.See Fig. 5, described smoke alarm 17 is every certain
Distance is installed at the top of cable tunnel, and specific mounting distance need to be determined according to actual conditions.
The present embodiment when in use, by Metro Cable external optical fiber, realize Metro Cable each point temperature measuring,
Detected by external force, the function of condition of a fire alarm, and laid by the bending of optical fiber, realize the work(that set of system monitors a plurality of optical fiber
Can, realize foundation to being provided in terms of Metro Cable fault detect and fire-proof and theft-proof alarm.
Although this specification more used single-core cable 1, optical fiber 2, No. two optical fiber 3, photoelectric conversion device 4,
The term such as number optical-electrical converter 5, No. two optical-electrical converters 6, alarm 7, smoke alarms 17, but be not precluded from using other
The possibility of term.It is used for the purpose of more easily describing the essence of the present invention using these terms, is construed as any
A kind of additional limitation is all disagreed with spirit of the present invention.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
It should be appreciated that the above-mentioned description for preferred embodiment is more detailed, therefore it can not be considered to this
The limitation of invention patent protection scope, one of ordinary skill in the art is not departing from power of the present invention under the enlightenment of the present invention
Profit is required under protected ambit, can also be made replacement or be deformed, each fall within protection scope of the present invention, this hair
It is bright scope is claimed to be determined by the appended claims.
Claims (6)
1. a kind of intelligent cable on-line monitoring system, it is characterised in that including single-core cable, be arranged on outside single-core cable epidermis
An optical fiber and No. two optical fiber, while the photoelectric conversion device being connected with an optical fiber and No. two optical fiber, and turn with photoelectricity
At least two tubules are provided with outside the computer system of changing device connection, the single-core cable epidermis, with single-core cable center
It is symmetrical arranged, an optical fiber and No. two optical fiber are individually positioned in tubule, the epidermis of single-core cable is uniformly provided with some miniature
Support, tubule is fixed on miniature support.
2. a kind of intelligent cable on-line monitoring system according to claim 1, it is characterised in that：Described opto-electronic conversion dress
The initial segment for being installed on the single-core cable is put, including：A number optical-electrical converter, No. two opto-electronic conversions and alarm, it is described
A number optical-electrical converter is connected with a described optical fiber, can be launched optical signal and be received the scattered light signal of setting, described
No. two optical-electrical converters be connected with No. two described optical fiber, optical signal can be launched and the scattered light signal of setting is received；Institute
The optical-electrical converter stated is electrically connected with described alarm, and cable is realized by the way that electric signal is delivered into described alarm
Temperature rise is alarmed；A described optical-electrical converter is electrically connected with No. two described optical-electrical converters, can be delivered to temperature information
No. two described optical-electrical converters；No. two described optical-electrical converters are electrically connected with described alarm, by the way that electric signal is defeated
Deliver to described alarm and realize that cable stress is alarmed.
3. a kind of intelligent cable on-line monitoring system according to claim 1, it is characterised in that：Described single-core cable is adopted
Triangle system of laying is taken, optical fiber, No. two optical fiber are bent with the radius of curvature set in described single-core cable end, supplied
Single-core cable described in next is used；Single-core cable includes：Core, internal shield, insulating material layer, external shielding layer, protection
Set, corrosion-resistant coating；Core is copper cash or aluminum steel；Insulating material layer is surrounded on outside described core and described internal shield；
Internal shield is surrounded on the core surface, with the core equipotential, prevents between core and the insulating material layer
Shelf depreciation；External shielding layer is surrounded on the megohmite insulant layer surface, prevents from producing part between insulating material layer and protective case
Electric discharge, protective case is surrounded on external shielding layer surface.
4. a kind of intelligent cable on-line monitoring system according to claim 3, it is characterised in that：Described core material is
Copper cash or aluminum steel, electric conductivity are good；Described insulating material layer material is crosslinked polyethylene, and insulating properties are good, described
Internal shield is made up of semi-conducting material, and the external shielding layer is made up of semi-conducting material, and described protective case is not using halogen
Crosslinked polyethylene fire proofing；Miniature support is consistent with described single-core cable and jacket material.
5. a kind of intelligent cable on-line monitoring system according to claim 4, it is characterised in that：A described optical fiber with
No. two described fiber lengths may not exceed 40 kms, surveys every section of single-core cable length and must not exceed 10 kms, described
Single-core cable end, a described optical fiber is bent with No. two described optical fiber with five to six centimetres of radius of curvature, and
Tubule through on next single-core cable.The on-line monitoring of the single-core cable described in 4 can be realized simultaneously.
6. a kind of intelligent cable on-line monitoring method, it is characterised in that：Including：
Step 1, an optical-electrical converter uses Raman scattering setting means, on the one hand conveys the temperature information collected
To the alarm, each point temperature information is on the other hand delivered to No. two optical-electrical converters；Described Raman scattering principle is
Temperature is reflected by the Stokes luminous intensity and anti-Stokes luminous intensity in collection of scattered light, can be derived with equation below
Draw：
The sub- frequency of Stokes ratio is：
vs=v0-Δv (0.1)
Anti-Stokes scattering photon equilibrium state photon frequency is：
vs=v0+Δv (0.2)
In formula, Δ v is Raman Phonon frequency, v0For incident photon frequency；
If R (T) is the ratio of above two scattered light intensity, it is shown below：
In formula, h is Planck's constant, and k is Boltzmann constant, and T is absolute temperature；
Optical fiber top is chosen as reference optical fiber, temperature is T0, then treat that testing temperature T is：
Step 2, No. two optical-electrical converters use Brillouin scattering setting means, by by a described optical-electrical converter
The temperature that the temperature information of conveying is collected with itself will obtain defeated by outer force information with being carried out difference processing by outer force information
Deliver to the alarm；Described Brillouin scattering principle is the frequency shift amount by gathering light, is shown below：
ΔvB=CvεΔε+CvTΔT (0.5)
Δ v in formulaBIt is Brillouin's frequency knots modification, Δ ε is dependent variable, and Δ T is temperature variation, for what is used herein
Under 1550nm light source, normal temperature, Brillouin's coefficient of strain is generally Cvε=0.0493MHz/ μ ε Brillouin's temperatures coefficient are generally
CvT=1.2MHz/ DEG C；
The temperature that step 1 is obtained substitutes into formula 1.5, you can obtain strain value.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029572A (en) * | 2018-07-25 | 2018-12-18 | 中国电力科学研究院有限公司 | It is bent the measurement method and system of the cable operation thermomechanical force under laid condition |
| CN113936438A (en) * | 2021-10-12 | 2022-01-14 | 国家电网有限公司 | Monitoring and early warning device for underground cable operating environment |
| CN114187736A (en) * | 2021-11-30 | 2022-03-15 | 国网重庆市电力公司市南供电分公司 | A kind of high-rise residential low-voltage cable fire detection and alarm system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313568A (en) * | 2011-08-30 | 2012-01-11 | 杭州布里特威光电技术有限公司 | Distributed optical fiber sensing device for simultaneously detecting Brillouin scattering and Raman scattering |
| CN202940055U (en) * | 2012-11-22 | 2013-05-15 | 中国西电集团公司 | Optical fiber monitoring early-warning medium-voltage power cable |
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| CN102313568A (en) * | 2011-08-30 | 2012-01-11 | 杭州布里特威光电技术有限公司 | Distributed optical fiber sensing device for simultaneously detecting Brillouin scattering and Raman scattering |
| CN202940055U (en) * | 2012-11-22 | 2013-05-15 | 中国西电集团公司 | Optical fiber monitoring early-warning medium-voltage power cable |
| CN103499768A (en) * | 2013-07-03 | 2014-01-08 | 甘肃省电力公司兰州供电公司 | Power cable real-time state monitoring and operation management system and measuring method of temperature of cable |
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| CN109029572A (en) * | 2018-07-25 | 2018-12-18 | 中国电力科学研究院有限公司 | It is bent the measurement method and system of the cable operation thermomechanical force under laid condition |
| CN113936438A (en) * | 2021-10-12 | 2022-01-14 | 国家电网有限公司 | Monitoring and early warning device for underground cable operating environment |
| CN113936438B (en) * | 2021-10-12 | 2022-12-13 | 国家电网有限公司 | Underground cable operation environment monitoring and early warning device |
| CN114187736A (en) * | 2021-11-30 | 2022-03-15 | 国网重庆市电力公司市南供电分公司 | A kind of high-rise residential low-voltage cable fire detection and alarm system |
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Application publication date: 20170711 |