CN106959173A - A kind of optical fiber is combined Metro Cable on-line monitoring system and monitoring method - Google Patents
A kind of optical fiber is combined Metro Cable on-line monitoring system and monitoring method Download PDFInfo
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- CN106959173A CN106959173A CN201710284341.XA CN201710284341A CN106959173A CN 106959173 A CN106959173 A CN 106959173A CN 201710284341 A CN201710284341 A CN 201710284341A CN 106959173 A CN106959173 A CN 106959173A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 81
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 8
- 210000005239 tubule Anatomy 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 210000002615 epidermis Anatomy 0.000 claims abstract description 7
- 239000011162 core material Substances 0.000 claims description 55
- 239000000463 material Substances 0.000 claims description 8
- 230000003287 optical effect Effects 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
- 239000000835 fiber Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [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
- 239000004065 semiconductor Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 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
- 238000009413 insulation Methods 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000011810 insulating material 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
- 238000005452 bending Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000009529 body temperature measurement Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000005622 photoelectricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 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
- 239000000779 smoke Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005286 illumination 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
- 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
- G01K11/322—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 using Brillouin scattering
-
- 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
- G01K11/324—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 using Raman scattering
-
- 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
- G01L1/242—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 the material being an optical fibre
Abstract
Metro Cable on-line monitoring system and monitoring method are combined the present invention relates to a kind of optical fiber; including single-core cable, an optical fiber being arranged on outside single-core cable epidermis and No. two optical fiber, while the photoelectric conversion device being connected with an optical fiber and No. two optical fiber; and the computer system being connected with photoelectric conversion device; at least two tubules are provided with outside the single-core cable epidermis; set with single-core cable Central Symmetry; a number optical fiber and No. two optical fiber are individually positioned in tubule, and tubule is installed in the protective case of single-core cable.Single-core cable is laid using triangle manner, and an optical fiber, No. two optical fiber realize the function that a set of detecting system monitors a plurality of Metro Cable by being bent in cable head-end and end with certain radius of curvature.The present invention realizes the temperature measuring of Metro Cable each point and stress is detected, improves the uniformity coefficient and accuracy of measurement temperature and stress.The service life of optical fiber is improved simultaneously.Metro Cable fault detect, burglar alarm etc. are provided and realize foundation.
Description
Technical field
The invention belongs to field of cables, it is related to a kind of optical fiber and is combined Metro 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
Joint detected, and by fibre optic installations in Exterior cable.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 fibre optic installations easily cause to damage in Exterior cable to optical fiber physical arrangement；
(3) Metro Cable is laid groove more a plurality of cable, and fibre optic installations can be by other in Exterior cable measured temperature
Cable temperature rise influences；
(4) Metro Cable is bent, then measurement accuracy can be caused to decline；
(5) thermometric, anti-theft alarm function 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 optical fiber and is combined Metro Cable on-line monitoring system and prison
Survey method.
A kind of optical fiber is combined Metro Cable on-line monitoring system, it is characterised in that including single-core cable, be arranged on single electricity
An optical fiber outside cable epidermis and No. two optical fiber, while the photoelectric conversion device being connected with an optical fiber and No. two optical fiber, with
And the computer system being connected with photoelectric conversion device, at least two tubules are provided with outside the single-core cable epidermis, with list
Core cable center is symmetrical arranged, and an optical fiber and No. two optical fiber are individually positioned in tubule, and tubule is installed on the guarantor of single-core cable
In sheath.
Metro Cable on-line monitoring system is combined in a kind of above-mentioned optical fiber, described photoelectric conversion device is installed on described
The initial segment of single-core cable, including：A number optical-electrical converter, No. two opto-electronic conversions and alarm, a described opto-electronic conversion
Device is connected with a described optical fiber, can be launched optical signal and be received the scattered light signal of setting, and No. two described photoelectricity turn
Parallel operation is connected with No. two described optical fiber, can be launched optical signal and be received the scattered light signal of setting；A described photoelectricity
Converter is electrically connected with described alarm, realizes that cable temperature rise is alarmed by the way that electric signal is delivered into described alarm；Institute
The optical-electrical converter stated is electrically connected with No. two described optical-electrical converters, and temperature information can be delivered to No. two described light
Electric transducer；No. two described optical-electrical converters are electrically connected with described alarm, by the way that electric signal to be delivered to described report
Alert device realizes that cable stress is alarmed.
Metro Cable on-line monitoring system is combined in a kind of above-mentioned optical fiber, described single-core cable takes triangle to lay
Mode, single-core cable includes：Core, internal shield, megohmite insulant, external shielding layer, protective case, corrosion-resistant coating；Core material is
Copper cash or aluminum steel；Described megohmite insulant is surrounded on outside described core and described internal shield；Described internal shield
The core surface is surrounded on, with the core equipotential, prevents that local put occurs between the core and the megohmite insulant
Electricity；The external shielding layer is surrounded on megohmite insulant surface, prevents from producing shelf depreciation between megohmite insulant and protective case, described
Protective case is surrounded on external shielding layer surface；At least two tubules are installed on inside protective case, and the thickness of protective case is more than tubule
Diameter, optical fiber, No. two optical fiber are respectively placed in inside two tubules.
Metro Cable on-line monitoring system is combined in a kind of above-mentioned optical fiber, and described core material is copper cash or aluminum steel,
Electric conductivity is good；Described insulating material layer material is crosslinked polyethylene, and insulating properties are good, and described internal shield is by half
Conductor material is constituted, and the external shielding layer is made up of semi-conducting material, and described protective case uses not halogen crosslinked polyethylene
Fire proofing；Miniature support is consistent with described single-core cable and jacket material.
Metro Cable on-line monitoring system, described an optical fiber and No. two described light are combined in a kind of above-mentioned optical fiber
Fine length may not exceed 40 kms, surveys every section of single-core cable length and must not exceed 10 kms, in 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 passes through next single
Tubule on cable.The on-line monitoring of the single-core cable described in 4 can be realized simultaneously.
A kind of optical fiber is combined Metro Cable on-line monitoring method, it is characterised in that：
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：The temperature measuring and stress for realizing Metro Cable each point are detected, using interior
Put optical fiber and eliminate external interference, optical fiber is installed on inside Metro Cable, improve the uniformity coefficient of measurement temperature and stress
With accuracy.The service life of optical fiber is improved simultaneously.Metro Cable fault detect, burglar alarm, tunnel smog detection are carried
For realizing foundation.
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 system of laying sectional view of the invention.
Fig. 4 is fibre optic installations schematic diagram of the invention.
Fig. 5 is present invention arrangement tunnel schematic diagram.
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 optical fiber that the present invention is provided is combined Metro Cable on-line monitoring system, including single-core cable 1, one
Number optical fiber 2, No. two optical fiber 3, photoelectric conversion devices 4.Described photoelectric conversion device 4 is installed on the starting of the single-core cable 1
Section, including：A number optical-electrical converter 5, No. two optical-electrical converters 6 and alarm 7, a described optical-electrical converter 5 with it is described
An optical fiber 2 connect, optical signal can be launched and the scattered light signal of setting is received, described No. two optical-electrical converters 6 with
No. two described optical fiber 3 are connected, and can be launched optical signal and be received the scattered light signal of setting.A described optical-electrical converter
5 electrically connect with described alarm 7, realize that cable temperature rise is alarmed by the way that electric signal is delivered into described alarm 7；Described
A number optical-electrical converter 5 is electrically connected with No. two described optical-electrical converters 6, and temperature information can be delivered to No. two described photoelectricity
Converter.No. two described optical-electrical converters 6 are electrically connected with described alarm 7, by the way that electric signal to be delivered to described report
Alert device 7 realizes that cable stress is alarmed.
See Fig. 2, described single-core cable 1 uses triangle system of laying, and described single-core cable 1 includes：Line
Core 11, internal shield 12, megohmite insulant 13, external shielding layer 14, protective case 15, corrosion-resistant coating 16, tubule 8.Described core 11
Material is copper cash or aluminum steel, and electric conductivity is good.The described material of megohmite insulant 13 is crosslinked polyethylene, and insulating properties are good,
It is surrounded on outside described core 11 and described internal shield 12.Described internal shield 12 is made up of semi-conducting material, ring
The surface of core 11 is around in, with the equipotential of core 11, prevents between the core 11 and the megohmite insulant 13
Shelf depreciation.The external shielding layer 14 is made up of semi-conducting material, is surrounded on the surface of megohmite insulant 13, is prevented megohmite insulant
Shelf depreciation is produced between 13 and protective case 15, described protective case 15 uses not halogen crosslinked polyethylene fire proofing.Institute
The tubule 8 stated is installed on inside described sheath 15, and a described optical fiber 2, No. two optical fiber 3 are positioned in described tubule 8
Portion.
See Fig. 3, described single-core cable 1 uses triangle system of laying, the single-core cable center described in three
It is wired to equilateral triangle.And three described single-core cable epidermises are brought into close contact.
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 8.The on-line monitoring of the single-core cable 1 described in 4 can be realized simultaneously.See Fig. 5, described smoke alarm 9 is every certain
Distance is installed at the top of cable tunnel, and specific mounting distance need to be determined according to actual conditions.
When in use, the temperature measuring and stress for realizing Metro Cable each point are detected the present embodiment, using built-in fiber
Eliminate external interference, optical fiber be installed on inside Metro Cable, improve the uniformity coefficient of measurement temperature and stress with it is accurate
Property.The service life of optical fiber is improved simultaneously.Realization is provided to Metro Cable fault detect, burglar alarm, tunnel smog detection
Foundation.
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, but be not precluded from using other arts
The possibility of language.It is used for the purpose of more easily describing the essence of the present invention using these terms, is construed as any one
Additional limitation is planted all to disagree 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 optical fiber is combined Metro Cable on-line monitoring system, it is characterised in that including single-core cable, be arranged on single-core cable
An optical fiber outside epidermis and No. two optical fiber, while the photoelectric conversion device being connected with an optical fiber and No. two optical fiber, and
At least two tubules are provided with outside the computer system being connected with photoelectric conversion device, the single-core cable epidermis, with single
Cable center is symmetrical arranged, and an optical fiber and No. two optical fiber are individually positioned in tubule, and tubule is installed on the protection of single-core cable
In set.
2. a kind of optical fiber according to claim 1 is combined Metro Cable on-line monitoring system, it is characterised in that：Described light
Electrical switching device is installed on the initial segment of the single-core cable, including：A number optical-electrical converter, No. two opto-electronic conversions and alarm
Device, a described optical-electrical converter is connected with a described optical fiber, can be launched optical signal and be received the scattered light of setting
Signal, No. two described optical-electrical converters are connected with No. two described optical fiber, can be launched optical signal and be received the scattering of setting
Optical signal；A described optical-electrical converter is electrically connected with described alarm, by the way that electric signal to be delivered to described alarm
Device realizes that cable temperature rise is alarmed；A described optical-electrical converter is electrically connected with No. two described optical-electrical converters, can be by temperature
Information conveyance is to No. two described optical-electrical converters；No. two described optical-electrical converters are electrically connected with described alarm, are passed through
Electric signal is delivered to described alarm and realizes that cable stress is alarmed.
3. a kind of optical fiber according to claim 1 is combined Metro Cable on-line monitoring system, it is characterised in that described list
Core cable takes triangle system of laying, and single-core cable includes：Core, internal shield, megohmite insulant, external shielding layer, protective case,
Corrosion-resistant coating；Core material is copper cash or aluminum steel；Described megohmite insulant is surrounded on described core and described internal shield
It is outside；Described internal shield is surrounded on the core surface, with the core equipotential, prevents the core and the insulation
Shelf depreciation occurs between material；The external shielding layer is surrounded on megohmite insulant surface, prevents between megohmite insulant and protective case
Shelf depreciation is produced, described protective case is surrounded on external shielding layer surface；At least two tubules are installed on inside protective case, protection
The thickness of set is more than the diameter of tubule, and optical fiber, No. two optical fiber are respectively placed in inside two tubules.
4. a kind of optical fiber according to claim 3 is combined Metro Cable on-line monitoring system, it is characterised in that：Described line
Core material is copper cash or aluminum steel, and electric conductivity is good；Described insulating material layer material is crosslinked polyethylene, and insulating properties are good
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 adopted
With not halogen crosslinked polyethylene fire proofing；Miniature support is consistent with described single-core cable and jacket material.
5. a kind of optical fiber according to claim 4 is combined Metro Cable on-line monitoring system, it is characterised in that：Described one
Number optical fiber may not exceed 40 kms with No. two described fiber lengths, surveys every section of single-core cable length and must not exceed 10 kms,
In described single-core cable end, a described optical fiber is carried out with No. two described optical fiber with five to six centimetres of radius of curvature
Bending, and pass through the tubule 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 optical fiber is combined Metro 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113012851A (en) * | 2021-02-01 | 2021-06-22 | 北京汽车集团越野车有限公司 | Electric wire, electric wire system and vehicle |
Citations (3)
| 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 |
| CN206670827U (en) * | 2017-04-26 | 2017-11-24 | 武汉大学 | A kind of compound Metro Cable on-line monitoring system of optical fiber |
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2017
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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 |
| CN206670827U (en) * | 2017-04-26 | 2017-11-24 | 武汉大学 | A kind of compound Metro Cable on-line monitoring system of optical fiber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113012851A (en) * | 2021-02-01 | 2021-06-22 | 北京汽车集团越野车有限公司 | Electric wire, electric wire system and vehicle |
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