CN208704788U - Drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system - Google Patents
Drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system Download PDFInfo
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Abstract
The utility model provides a kind of drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optic, the system includes sequentially connected distribution type fiber-optic component, light source generator, data acquisition device and data processing centre, the distribution type fiber-optic component includes at least one the monitoring group being set to inside drainage pipeline, each monitoring group includes a distributed monitoring optical fiber and a distributed strain compensated optical fiber, and the distributed monitoring optical fiber and the distributed strain compensated optical fiber are arranged side by side in drainage pipeline inner wall and are axially arranged along drainage pipeline.The utility model distribution type fiber-optic is both signal induction device, it is signal transmitting apparatus again, the distributed on line monitoring of drainage pipeline can be achieved, and the monitoring System spatial resolution is high, for monitoring system along any point of journey, the characteristic of fluid and pipeline health status of the position can be obtained in real time, and is able to achieve the compensation to player's interference, and monitoring accuracy is higher.
Description
Technical field
The utility model relates to drainage system on-line monitoring field more particularly to a kind of rows based on OFDR distribution type fiber-optic
Waterpipe monitors compensation system.
Background technique
The buried underground of drainage pipeline, the extraneous load and Earth cave the effects of under, it is disconnected that pipeline will appear part
Split, bell and spigot disconnect phenomena such as, influence the normal operation of drainage system.Further, since solid containing a certain amount of suspension in water
Body magazine will appear different degrees of blocking, corrosion phenomenon after pipeline longtime running, the phenomenon pipeline part drawback especially
Seriously, the drainage pipeline of buried underground is difficult to determine specific damage position, this for later period pipe dredging bring it is very big not
Just.For heavy caliber drain pipe, deep tunnel is especially drained, water flow inside flow is larger, and fluid mostly exists with turbulence form, and
Tubulence energy is larger.Excessive tubulence energy can damage deep tunnel structure, and even fluid sprays ground along vertical shaft, over the ground dough figurine
Member and building damage.For storm-water system, the opening and closing of gate or the unexpected start and stop of water pump inside deep tunnel under flowing full state
Local transient flow can be generated, deep tunnel structure safety is influenced.
Under the construction background of current " smart city ", " wisdom drainage system " will be that future city drains the mainstream built
Trend, the premise that intelligent management and control are carried out to drainage system is to grasp the flow velocity of each pipeline section in drainage pipeline networks, stream in real time
The information such as state, degree of filling, pipeline health status.Existing drainage system monitoring is supervised mainly for the water quality of part of contaminated water monitoring point
The flow monitoring of survey or Partial key node, monitoring function is single, and monitoring point distribution is scattered, and subdrainage pipe network is crisscross multiple
Miscellaneous, fluids within pipes fluidised form is ever-changing, is only difficult to reflect the global feature (stream of drainage system with a small amount of discrete monitoring point
Speed, fluidised form, degree of filling, pipeline configuration health status etc.)." CCTV " monitoring technology for occurring in recent years, intelligent sphere, sonar monitoring
On the one hand the novel pipelines such as method monitoring method still falls within point type monitoring, it is difficult to the spy of reflection fluids within pipes and pipeline in real time
Sign, another aspect monitoring efficiency is low, and monitoring cost is higher.
With the development of computer and automatic control technology, the various valves with automatic regulation function, water pump etc. are being arranged
It is gradually applied in water system, but the auto-control of drainage system is also limited to the fine tuning of a small range at present, to realize
Macro adjustments and controls to entire municipal drainage network main pipe, with the proviso that the various information of arterial drainage can be grasped in real time.City is big
It is badly in need of a kind of along journey on-line real time monitoring device, to realize that the intelligence of drainage system is managed, wisdom tune in scale buried drain pipe road
Spend function.
Utility model content
The purpose of this utility model is to provide a kind of, and the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system,
It is intended for solving existing drainage pipeline monitoring system monitoring point and is distributed that scattered, monitoring efficiency is low and monitoring cost is high
Problem.
The utility model is realized in this way:
On the one hand, the utility model provides a kind of drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optic, packet
Include sequentially connected distribution type fiber-optic component, light source generator, data acquisition device and data processing centre, the distribution
Formula optical fiber component includes at least one the monitoring group being set to inside drainage pipeline, and each monitoring group includes a distributed monitoring
Optical fiber and a distributed strain compensated optical fiber, the distributed monitoring optical fiber and the distributed strain compensated optical fiber are set side by side
It is placed in drainage pipeline inner wall and is axially arranged along drainage pipeline.
Further, the distributed monitoring optical fiber includes the fiber core, coat, cladding set gradually from inside to outside
Layer and flexible shroud.
Further, the distributed strain compensated optical fiber include the fiber core set gradually from inside to outside, coat,
Clad, flexible shroud and rigid sheath.
Further, the distributed monitoring optical fiber and the distributed strain compensated optical fiber are all made of epoxy resin stickup
In drainage pipeline inner wall.
Further, the monitoring group has multiple and is respectively arranged at different degree of fillings position inside drainage pipeline.
Further, the distribution type fiber-optic component further includes that the distributed temperature set on drainage pipeline inner wall top compensates
Optical fiber.
Further, the distributed temperature compensated optical fiber include the fiber core set gradually from inside to outside, coat,
Clad, flexible shroud and rigid sheath have gap between the flexible shroud and the rigid sheath.
Further, distribution type fiber-optic component outside after the part of inspection shaft is whole or separates is cased with stainless
Steel sleeve.
Compared with prior art, the utility model has the following beneficial effects:
(1) the utility model distribution type fiber-optic is both signal induction device and signal transmitting apparatus, it can be achieved that drainpipe
The distributed on line monitoring in road, and the monitoring System spatial resolution is high (up to mm grades), for monitoring system along any of journey
A bit, the characteristic of fluid and pipeline health status of the position can be obtained in real time, help to carry out entire drainage system macroscopical tune
Control.
(2) the utility model monitoring accuracy is high (can be accurate to 0.5 μ ε), and monitoring range is wide (usually can be more than 50km), edge
Cheng Caiyong optical signal transmission, loss of signal is small, and anti-electromagnetic interference capability is strong.
(3) general single mode fiber can be used in optical fiber used in the utility model, low in cost, is suitble in sewerage system
Large-scale use.
(4) the utility model is multiple functional, it can be achieved that flow monitoring, transient flow monitoring, pipeline sediment monitor ing and pipeline are strong
Health monitoring, can also compensate extraneous vibration interference.
Detailed description of the invention
Fig. 1 is a kind of drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optic provided by the embodiment of the utility model
The overall structure diagram of system；
Fig. 2 is the arragement construction figure of distribution type fiber-optic component provided by the embodiment of the utility model；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is the schematic cross-section of distributed temperature compensated optical fiber provided by the embodiment of the utility model；
Fig. 5 is the schematic cross-section of distributed monitoring optical fiber provided by the embodiment of the utility model；
Fig. 6 is the schematic cross-section of distributed strain compensated optical fiber provided by the embodiment of the utility model；
Fig. 7 is the schematic longitudinal section of the arragement construction of distribution type fiber-optic component provided by the embodiment of the utility model；
Fig. 8 is the arrangement side that distribution type fiber-optic component provided by the embodiment of the utility model enters drainage pipeline along inspection shaft
Formula schematic diagram；
Fig. 9 is arrangement signal of the distribution type fiber-optic component provided by the embodiment of the utility model in the inspection shaft of downstream
Figure；
Figure 10 is the partial enlarged view of Fig. 9.
Description of symbols: 1- light source generator, 2- distribution type fiber-optic component, the first monitoring of 21- group, 22- second are supervised
Survey group, 23- third monitoring group, 24- distributed temperature compensated optical fiber, 25- distributed monitoring optical fiber, the compensation of 26- distributed strain
Optical fiber, 3- drainage pipeline, 4- data acquisition device, 5- signal Wireless Transmitter, 6- data processing centre, 7- epoxy resin, 8-
Fiber core, 9- coat, 10- clad, 11- flexible shroud, 12- rigid sheath, 13- inspection shaft, 14- stainless steel sleeve pipe.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the utility model embodiment provides one kind based on OFDR(optical frequency domain reflectometer) distribution type fiber-optic
Drainage pipeline monitors compensation system, belongs to on-line monitoring, which includes sequentially connected distribution type fiber-optic component 2, light source hair
Generating apparatus 1, data acquisition device 4 and data processing centre 6, the light source generator 1 are used for distribution type fiber-optic component 2
The scattering light that transmitting laser and reception distribution type fiber-optic component 2 are passed back, can be used a wide-band linearity swept light source and one
Michelson's interferometer realizes that the data acquisition device 4 is used for the fiber-optic monitoring signal passed back to distribution type fiber-optic component 2
It is acquired, photodetector can be used to realize, the light letter that the photodetector acquisition distribution type fiber-optic component 2 is passed back
Number, electric signal is converted optical signals into, and data processing centre 6, the data processing are passed to by signal Wireless Transmitter 5
Center 6 includes terminal computer and matched data processing software, the monitoring for distribution type fiber-optic component 2 based on the received
Value is analyzed, and every monitoring parameters of drainage pipeline 3 are obtained.As shown in Figures 2 and 3, the distribution type fiber-optic component 2 includes
At least one the monitoring group being set to inside drainage pipeline 3, each monitoring group include a distributed monitoring optical fiber 25 and one
Distributed strain compensated optical fiber 26, the distributed monitoring optical fiber 25 and distributed strain compensated optical fiber 26 are arranged side by side in draining
3 inner wall of pipeline and along the axial setting of drainage pipeline 3.The utility model distributed monitoring optical fiber 25 be both signal induction device and
Signal transmitting apparatus, it can be achieved that drainage pipeline 3 distributed on line monitoring, and the monitoring System spatial resolution is high (reachable
Mm grades), for monitoring system along any point of journey, the fluid stream of the position can be obtained in real time by the strain value of optical fiber
Speed, transient flow, pipeline deposit and the health status of pipeline, and monitoring comprehensively, helps to carry out entire drainage system macroscopical tune
Control；Reference of the monitor value of the distributed strain compensated optical fiber 26 as distributed monitoring optical fiber 25, makes an uproar to exclude the external world
The interference of sound, vibration etc..The utility model monitoring accuracy is high (can be accurate to 0.5 μ ε), and monitoring range extensively (usually can be more than
50km), along Cheng Caiyong optical signal transmission, loss of signal is small, and anti-electromagnetic interference capability is strong.
As shown in figure 5, the distributed monitoring optical fiber 25 includes setting gradually from inside to outside as one of embodiment
Fiber core 8, coat 9, clad 10 and flexible shroud 11.Preferably, the distributed monitoring optical fiber 25 uses epoxy
Resin 7 is pasted on 3 inner wall of drainage pipeline.The distributed strain compensated optical fiber 26 includes the optical fiber fibre set gradually from inside to outside
Core 8, coat 9, clad 10, flexible shroud 11 and rigid sheath 12 exclude external interference by rigid sheath 12.Described point
Cloth strain compensation optical fiber 26 is equally pasted on 3 inner wall of drainage pipeline using epoxy resin 7.
As shown in Figure 2 and Figure 7, as the preferred of the present embodiment, the monitoring group has multiple and is respectively arranged at draining
The inside of pipeline 3 different degree of fillings position in this implementations, there are three the monitoring group has, including is respectively arranged at drainage pipeline 3 and fills
The first monitoring group 21, the second monitoring group 22 and third monitoring group 23 at full scale 0.85,0.5 and 0.15 position, by
Multiple monitoring groups are arranged in the different degree of filling positions in 3 inside of drainage pipeline, can also obtain the degree of filling situation of drainage pipeline 3.
As shown in Fig. 2, the distribution type fiber-optic component 2 further includes being set in drainage pipeline 3 as the preferred of the present embodiment
The distributed temperature compensated optical fiber 24 on wall top, for monitoring strain caused by ambient temperature variation, thus to the distribution
The monitor value of monitoring optical fiber 25 compensates.As shown in figure 4, optionally, the distributed temperature compensated optical fiber 24 includes by interior
Fiber core 8, coat 9, clad 10, flexible shroud 11 and the rigid sheath 12 set gradually outward, the flexible shroud
There is gap, to guarantee that optical fiber and flexible shroud 11 can freely move in rigid sheath 12 between 11 and the rigid sheath 12
It is dynamic.The distributed temperature compensated optical fiber 24 is also pasted on 3 inner wall of drainage pipeline using epoxy resin 7.By by distributed temperature
It spends compensated optical fiber 24 and is set to 3 inner wall top of drainage pipeline, stress caused by tube fluid flows can not directly act on distribution
Temperature-compensated fiber 24, and pass through rigid sheath, stress caused by external interference can not also directly act on distributed temperature benefit
Repay optical fiber 24, i.e. the strain that monitors of distributed temperature compensated optical fiber 24 is only related with ambient temperature variation.
Further, the distribution type fiber-optic component 2 is whole enters corresponding drainage pipeline 3 along selected inspection shaft 13, with
3 end of drainage pipeline of the inspection shaft downstream connection compensates light as monitoring starting point, the distributed temperature of distribution type fiber-optic component 2
Fibre 24 and each monitoring group are arranged apart in drainage pipeline 3.As shown in figure 8, in the position institute by selected inspection shaft 13
Distribution type fiber-optic component 2 is stated to lay using the form of integral sleeve stainless steel sleeve pipe 14 along 13 inner wall of inspection shaft, as shown in figure 9,
In the position by downstream inspection shaft, outer casing stainless steel set is respectively adopted in distributed temperature compensated optical fiber 24 and each monitoring group
The form of pipe 14 is laid inside inspection shaft.By outer casing stainless steel casing 14, prevent optical fiber by external damage, optical fiber is not
It can be moved freely in rust steel sleeve 14.Distribution type fiber-optic component 2 monitors in inspection shaft 13 without characteristic of fluid, only carries out
Whether monitoring structural health conditions, including 13 well body structural health of inspection shaft and drainage pipeline 3 loosen or take off with 13 connector of inspection shaft
It falls.In view of the 3 position fluid turbulent fluctuation of upstream and downstream drainage pipeline being connected with inspection shaft 13 is stronger, therefore optical fiber is in inspection shaft 13
3 position of upstream and downstream local draining pipeline still uses stainless steel sleeve pipe 14, as seen in figs. 8-10,13 borehole wall upstream and downstream 5 of inspection shaft ~
Stainless steel sleeve pipe 14 can be cancelled other than 10m range, actual range can be appropriately adjusted according to 3 caliber difference of drainage pipeline.
Each optical fiber of the distribution type fiber-optic component 2 can use general single mode fiber, low in cost, be suitble in city
Large-scale use in city's drainage system.
Each optical fiber of distribution type fiber-optic component 2 is drawn in a manner of single-ended connection from monitoring starting point, and starting point is monitored
Position is flexibly chosen in combination with the characteristics of drainage pipeline networks, and optical fiber final position is to monitor system end, and distal optical fiber is without examining
Consider circuit.
The utility model embodiment also provides a kind of above-mentioned drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optic
The monitoring compensation method of system, which can execute in the data processing centre 6, for dividing based on the received
The monitor value of cloth optical fiber component 2 is analyzed, and every monitoring parameters of drainage pipeline 3 are obtained, which includes:
The relationship being positively correlated using the spectral shift amount and fluid flow rate of distributed monitoring optical fiber 25, first using distribution
Optical fiber demarcates flow velocity and shearing stress in experimental enviroment, passes through calibration value and distributed monitoring during actual monitoring
The shearing stress inverse of optical fiber 25 goes out fluid flow rate；
The range of pressure fluctuations of transient flow is obtained by the strain value and strain fluctuation range of distributed monitoring optical fiber 25
And energy dissipation situation；
Caused by whether monitoring water flow flowing in drainage pipeline 3 according to each distributed monitoring optical fiber 25 of multiple monitoring groups
Vibration signal judges 3 degree of filling of drainage pipeline；
It is bright according to the fluctuation range for whether occurring a certain section of strain value in the strain monitoring result of distributed monitoring optical fiber 25
The aobvious fluctuation less than strain value around the position, judges whether pipeline deposits；
Whether there is position constant strain abnormality peak value occur according to distributed monitoring optical fiber 25, judges that drainage pipeline 3 is
No occur that pipeline creep, Non-uniform Settlement, local fracture, connector falls off or the pipeline health problem of corrosive pipeline.
The realization pair of the monitor value of distributed strain compensated optical fiber 26 and distributed temperature compensated optical fiber 24 can also be passed through
The compensation of external interference, above-mentioned monitoring compensation method further include:
The monitor value of distributed monitoring optical fiber 25 is subtracted to the monitor value of distributed strain compensated optical fiber 26, can be eliminated outer
Boundary's vibration interference error；
The monitor value of distributed monitoring optical fiber 25 is subtracted to the monitor value of distributed temperature compensated optical fiber 24, can be eliminated outer
The error that boundary's temperature change generates.
By the measure of above-mentioned external interference error compensation, so that the precision of monitoring is higher.
Below to the principle for obtaining every monitoring parameters in above-mentioned monitoring compensation method and being compensated to external interference
And method detailed is illustrated.
The big monitoring parameters of above-mentioned monitoring compensation method available five: flow monitoring, transient flow monitor, degree of filling monitors,
Pipeline sediment monitor ing and pipeline health monitoring parameter.
1) flow monitoring
In heavy caliber rain pipe or rainwater depth tunnel, rainwater liquid form is mainly that nearly wall turbulent flow, turbulent flow are sheared in unstable state
Viscosity at any time with space and change, at present about theoretical still immature, circumferential shearing stress of the fluid to inner wall of the pipe of turbulent flow
It is difficult to accurately quantificational expression, but the qualitative relationship for proving itself and axial time average velocity can be derived by following.
Pipeline stream can be described with Navier-Stokes equation, but unintentional nonlinearity item leads to equation in equation
It can not accurately solve so far.French scholar Boussinesq is to the Reynalds stress item in Navier-Stokes equation
Quantitative research has been carried out, has derived axial shearing stress expression formula in turbulent flow:
| (1-1) |
In formula,For turbulent fluctuation momentum exchange coefficient；
ρ is the density of water；
U, y is respectively axial flow velocity and circumferential flow velocity.
It is similar therewith, available pipeline stream circumferential direction shearing stress expression formula:
| (1-2) |
In conjunction with the semiempirical turbulent theory (mixing length theory) that German scholar L.Prandtl is proposed, to above-mentioned turbulent flow ring
It is further simplified, obtains to shearing stress formula:
| (1-3) |
In formula, l is the mean free path in stream group blending procedure.
Fluid circumferential direction turbulence intensity can be expressed from the next again:
| (1-4) |
Fluid turbulence intensity is to measure its turbulent fluctuation degree, and for nearly wall turbulent flow, axial time average velocity is bigger, fluid respectively to
Turbulent fluctuation is stronger, i.e., with the increase of axial time average velocity, circumferential flow rate-of-change is greater than axial time average velocity, it can be considered that
Formula middle termIt is positively correlated with fluid axial direction time average velocity, i.e., fluid axial direction time average velocity is bigger in drainage pipeline, and fluid is to pipe
The circumferential shearing stress of road inner wall is also bigger.
Above-mentioned conclusion can also pass through the qualitative derivation of following formula:
The estimation formula of tubulence energy k is as follows:
| (1-5) |
In formula, v is the mean flow rate of fluid；
I is turbulence intensity, and calculation formula is as follows:
| (1-6) |
In formula, v is the mean flow rate of fluid；
For fluid motion viscosity；
D is hydraulic radius.
(1-5), (1-6) two formula are merged, obtained:
| (1-7) |
By formula (1-6) it can be concluded that the quantitative relationship of fluid mean flow rate and tubulence energy, in process fluid flow, turbulence
It can will be dissipated in the form of pulse viscous stress and the work of deformation that strain forms of pulsing, that is, turbulent vortices be formed, in inner wall of the pipe
Near, various sizes of turbulent vortices collide with inner wall of the pipe.Flow velocity is bigger, and Hydrodynamic turbulence can be bigger, turbulent vortices pair
The shearing stress of inner wall of the pipe is bigger.
For distribution type fiber-optic, it is dry that beat frequency occurs for the reference luminous energy in internal backward Rayleigh scattering light and reference arm
It relates to, Fourier transformation is carried out to interference spectrum, can obtain various information of the distribution type fiber-optic along journey, and distribution type fiber-optic
When point external condition (strain etc.) changes, the backward rayleigh scattering spectrum of the point shifts, and offset is directly proportional to strain value.
It is above positively correlated with fluid flow rate in the qualitative proof pipeline of two methods with pipeline circumferential direction shearing stress, by mechanics of materials public affairs
Formula is it is found that stress and strain suffered by material is directly proportional, and fibre strain is directly proportional to spectral shift amount, it is understood that
Spectral shift amount is positively correlated with fluid flow rate.Distribution type fiber-optic based on OFDR is extremely sensitive, and monitoring accuracy is up to 0.5 μ ε.It can
Flow velocity and shearing stress are demarcated in experimental enviroment using distribution type fiber-optic, passes through calibration value in later period monitoring and cuts and answer
Power can inverse go out fluid flow rate.It should be noted that Turbulence Flow is extremely complex, the flow monitoring function referred in the utility model
There can be certain error, but pass through the data accumulation in a variety of error concealment measures and later period monitoring process of this system proposition
It, can be by control errors in a certain range with check and correction.
2) transient flow (water hammer) monitors
" wisdom draining " will carry out intelligent control according to key node of the real-time fluidised form information of drainage pipeline to pipe-line system
System is mainly reflected in valve opening variation, the variation of water pump operation operating condition etc..The variation of these drainage system parameters will be to water in pipe
Stream fluidised form has an important influence on, and under flowing full state, the unexpected closing of valve or water pump stop especially large diameter pipeline suddenly
All there may be water hammers, damage to pipeline configuration, or even spray rainwater along inspection shaft, to ground staff and construction of structures
It damages.Russia scholar Joukovsky proposes the relationship of pipeline pressure and flow velocity under the conditions of transient flow:
| (1-8) |
In formula,For the head (m) generated during sudden change of flow speed；
A is pressure wave speed (m/s)；
G is acceleration of gravity, (m/s2)；
V0 is fluids within pipes mean flow rate (m/s).
From the above equation, we can see that transient flow process medium fluid kinetic head is by partly or entirely being transformed into pressure head (ignores part
Water damage), biggish direct stress is generated to inner wall of the pipe, promotes distributive fiber optic strain.Since water hammer only occurs in pipeline part
Position will significantly increase, hence it is evident that big whole flowing line in the strain value for the local location distribution type fiber-optic that water hammer occurs
In the strain value of this upstream and downstream other positions, embodying on the computer screen will be that ordinate (strain value) is abnormal raised
A string of instantaneous strain peaks, specifically, can be with by the abscissa fluctuation range (i.e. coverage) for reading string strain peak extremely
The range of pressure fluctuations of transient flow is obtained, by the available transient flow of most value for reading string strain spike peak and trough extremely
Energy dissipation situation.
3) pipe full degree monitors
Its fullness information dispatches the valve regulation of entire drainage system with water pump to storm sewer in the process of running
Important function, however a kind of concrete measure that can monitor storm sewer degree of filling along journey in real time currently not yet.The utility model
It can be achieved to monitor storm sewer, the online of deep tunnel degree of filling along journey.First monitoring group, the second monitoring group and third monitor component
It Wei Yu not pipe full degree 0.85,0.5 and 0.15.When 3 monitoring groups do not monitor vibration caused by water flow flowing in pipeline
When signal, pipe full degree is less than 0.15, when only third monitoring group monitors vibration signal, pipe full degree be 0.15 ~
0.50, when second, third monitoring group monitors vibration signal, pipe full degree is 0.50 ~ 0.85, when three monitoring groups are supervised
When measuring vibration signal, pipe full degree is greater than 0.85, and pipeline has overload dangerous at this time, should adjust valve or pump working shape
State.In addition, the utility model can also monitor the degree of filling situation of pipeline different location, such as when monitoring that a certain segment pipe is long-term
Degree of filling is larger, and when the segment pipe upstream and downstream degree of filling is smaller, it is contemplated that increase the caliber or the gradient of the segment pipe.
4) pipeline sediment monitor ing
Pipeline siltation usually occurs in local turning point or knick point, when the sediment deposit of pipeline covers third monitoring group,
Influence of the turbulent fluctuation of fluid to third monitoring group will substantially be weakened because of the presence of sediment deposit, the distributed monitoring of third monitoring group
Fibre strain monitoring result will be fluctuation that the corresponding strain value fluctuation range of certain section of abscissa is significantly less than around the position, this
The outer strain signal difference by comparison same position the second monitoring group and third monitoring group, also can determine whether the siltation position of pipeline
It sets, and then reads the abscissa value, can further obtain the length that siltation pipeline section occurs.
5) pipeline health monitoring
Distributed optical fiber sensing system can also be achieved pipeline creep, Non-uniform Settlement, local fracture, connector fall off, manage
The pipelines health monitorings such as road corrosion.The above phenomenon is based on distributive fiber optic strain monitoring principle, i.e., when pipeline somewhere goes out
When the existing above problem, the corresponding position of distribution type fiber-optic will appear constant strain abnormality peak, by reading the strain abnormality peak
Corresponding abscissa positions, and coordinate system conversion is carried out, it can be obtained the specific location of pipeline accident point.It is worth noting that
When pipeline occurs to disconnect, be broken etc., the distribution type fiber-optic of corresponding position may be broken, and be remained in that case by rear
Fault point is positioned to Rayleigh scattering, but the later period needs to change the optical fiber of corresponding position.The local replacing of distribution type fiber-optic can
It is completed by optical fiber splicer.
Drainage pipeline is usually embedded in below urban road, and the interference such as extraneous vibration is larger, in above-mentioned monitoring compensation method
It can also be compensated using following interference compensation method:
1) strain compensation
Drainage pipeline or deep tunnel are usually embedded in below urban road, the vibration of the generations such as vehicle driving or tube circumference construction
It is dynamic certain interference to be caused to distributed optical fiber sensing system.To exclude the above interference, in the first, second and third monitoring group
In, a distributed strain compensated optical fiber is respectively set.Distributed strain compensated optical fiber outermost is coated using rigid sheath, can be kept away
Exempting from fluids within pipes flowing influences it, and outermost rigid sheath is closely connect with the flexible shroud of time outer layer, it is believed that
The monitor value of strain compensation optical fiber is that the comprehensive of external interference embodies, and the monitor value of distributed monitoring optical fiber is subtracted distribution and is answered
The monitor value for becoming compensated optical fiber, can eliminate external interference error.
2) temperature-compensating
Distributed optical fiber sensing system will be mounted in pipeline and work for a long time, with season alternation, ambient temperature variation
Inside of optical fibre refractive index will be caused to change, to generate certain error.For this purpose, laying one point on inner wall of the pipe top
Cloth temperature-compensated fiber, the optical fiber outermost layer are rigid sheath, and secondary outer layer is flexible shroud, rigid sheath and flexible shroud it
Between there are a fixed gap, i.e., distribution type fiber-optic and its flexible clad can in rigid sheath free extension.By this kind of measure,
Stress caused by external interference and tube fluid flow can not directly act on temperature-compensated fiber, i.e. temperature-compensated fiber monitors
The strain arrived is only related with ambient temperature variation.The monitor value of distributed monitoring optical fiber is subtracted into distributed temperature compensated optical fiber
Monitor value can eliminate the error that ambient temperature variation generates.
3) strain, temperature integrated compensation
The case where water level is more than the first monitoring group in pipeline is more rare, usually manage in water level between the first monitoring group and the
Between two monitoring groups or between the second monitoring group and third monitoring group.Distributed monitoring optical fiber in first monitoring group can be made
For the reference fiber of the second monitoring group and third monitoring group, the influence being superimposed external interference and temperature change is discharged.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (8)
1. a kind of drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system, it is characterised in that: including sequentially connected
Distribution type fiber-optic component, light source generator, data acquisition device and data processing centre, the distribution type fiber-optic component packet
At least one the monitoring group being set to inside drainage pipeline is included, each monitoring group includes a distributed monitoring optical fiber and one point
Cloth strain compensation optical fiber, the distributed monitoring optical fiber and the distributed strain compensated optical fiber are arranged side by side in drainage pipeline
Inner wall and along drainage pipeline axially be arranged.
2. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
Stating distributed monitoring optical fiber includes the fiber core set gradually from inside to outside, coat, clad and flexible shroud.
3. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
State distributed strain compensated optical fiber include the fiber core set gradually from inside to outside, coat, clad, flexible shroud and just
Property sheath.
4. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
It states distributed monitoring optical fiber and the distributed strain compensated optical fiber is all made of epoxy resin and is pasted on drainage pipeline inner wall.
5. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
Stating monitoring group has multiple and is respectively arranged at different degree of fillings position inside drainage pipeline.
6. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
Stating distribution type fiber-optic component further includes the distributed temperature compensated optical fiber set on drainage pipeline inner wall top.
7. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as claimed in claim 6, it is characterised in that: institute
State distributed temperature compensated optical fiber include the fiber core set gradually from inside to outside, coat, clad, flexible shroud and just
Property sheath, between the flexible shroud and the rigid sheath have gap.
8. the drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system as described in claim 1, it is characterised in that: institute
It states distribution type fiber-optic component and is cased with stainless steel sleeve pipe in outside after the part of inspection shaft is whole or separates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201821365281.0U CN208704788U (en) | 2018-08-23 | 2018-08-23 | Drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821365281.0U CN208704788U (en) | 2018-08-23 | 2018-08-23 | Drainage pipeline based on OFDR distribution type fiber-optic monitors compensation system |
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| CN208704788U true CN208704788U (en) | 2019-04-05 |
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| CN108759936A (en) * | 2018-08-23 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optics and method |
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