CN206683627U - Subway sedimentation monitoring system based on distributive fiber optic strain sensing - Google Patents
Subway sedimentation monitoring system based on distributive fiber optic strain sensing Download PDFInfo
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- CN206683627U CN206683627U CN201720341921.3U CN201720341921U CN206683627U CN 206683627 U CN206683627 U CN 206683627U CN 201720341921 U CN201720341921 U CN 201720341921U CN 206683627 U CN206683627 U CN 206683627U
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- sensor fibre
- sedimentometer
- fiber optic
- subway
- strain
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Abstract
It the utility model is related to a kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing, including distributive fiber optic strain analyzer, sensor fibre, sedimentometer, air communication pipe, fluid connection pipe and fluid reservoir, described distributive fiber optic strain analyzer forms a sensing testing light path with sensor fibre, fibre strain and temperature to everywhere in light path are monitored, described sedimentometer is installed on region to be measured, described air communication pipe series connection sedimentometer and fluid reservoir, described connect respectively liquid level communicating pipe and air communication pipe sedimentometer and fluid reservoir, wherein it is located at liquid level communicating pipe below liquid level, air communication pipe is located above liquid level.The utility model has the advantages that：(1) single set system can realize long distance monitoring and transmission；(2) system cost is low, and popularization and application feasibility is high；(3) sensor ends are simple without power supply and communication, system architecture；(4) distribution type fiber-optic has anti-electromagnetic interference capability.
Description
Technical field
The present invention relates to the safe and healthy monitoring field of infrastructure architecture, more particularly to one kind to be based on distributive fiber optic strain
The subway sedimentation monitoring system of sensing.
Background technology
As Urbanization in China is accelerated, urban population increases, and brings huge pressure to urban transportation, subway because
Its is quick, convenient, handling capacity of passengers is big advantage and meet the tendency of and be widely applied.At present, subway, root are all being built in each big city energetically
Planned according to track traffic Long-and Medium-term Development, 3000 kilometers will be built during 13, to 13 ends, national rail transportation operation
Mileage is up to 7000 kilometers.However, the present situation of " rebuild and do not support again " is presented in domestic subway construction at present more, especially in China
Iron builds the stage in still category development, and this can bury potential safety hazard to the stabilization of operation and surrounding buildingses in the future of subway.
Modern subway tunnel quantity is more, the features such as intersecting and be highly dense subway work is proposed it is strict will
Ask, the baneful influences such as the displacement, deformation or even landslide of rock-soil layer are inevitably caused during the building and run of subway.Cause
This, an important factor for settlement monitoring of subway is always structure of the subway security evaluation.
At present, the methods of settlement monitoring for subway mainly uses total powerstation, the measurement of the level and hydrostatic level, and it is right
It is few in the Case comparison that subway is monitored on-line on a large scale, it is therefore necessary to develop a set of ground a wide range of to subway, inexpensive
Iron sedimentation monitoring system.
Distributed optical fiber strain sensor using optical fiber in itself not only as sensing unit but also as transmission medium, can be accurate
The strain of any position and temperature information on optical fiber are measured in ground, realize long range, the monitoring of continuously distributed formula.Distributive fiber optic strain
Sensing technology has significant technical advantage and wide in bridge, tunnel, side slope spacecraft, the isostructural safety monitoring of ship
Application prospect.
Domestic related research institutes propose the settlement monitoring patent based on distributive fiber optic strain sensing, but exist
Defect and deficiency.Scratched as practical novel C N201220518062 proposes a kind of structure based on brillouin distributed optical fiber sensing
Spend sedimentation monitoring system, its technical scheme be by two pulleys to wind, stationary distribution formula optical fiber, when produce sedimentation when, twine
Around optical fiber suffered by power will change.A variety of optical fiber (business single mode bare fibre, the list of external application armor are employed in the system
Mould bare fibre), system complexity and production cost are improved, while business single mode bare fibre is in the less pulley of winding size
Bending loss is easily produced, causes system monitoring distance significantly to decay, the life of product is then improved according to anti-microbend fiber
Produce cost.Optical fiber is in oily liquids, and long period of soaking can corrode the coat of optical fiber, easily damage optical fiber.
The content of the invention
In order to overcome short high cost, the monitoring distance of existing subway settlement monitoring, power supply and communication system architecture complicated, steady
It is qualitative it is poor, can not the poor deficiency of electromagnetism interference, environmental suitability, should based on distribution type fiber-optic the invention provides one kind
Become the subway sedimentation monitoring system of sensing technology.
To achieve the above object, present invention employs following technical scheme：
A kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing, including distributive fiber optic strain analysis
Instrument, sensor fibre, sedimentometer, air communication pipe, fluid connection pipe and fluid reservoir, described distributive fiber optic strain analyzer with
Sensor fibre forms a sensing testing light path, and fibre strain and temperature to everywhere in light path are monitored, and described is heavy
Drop instrument is installed on region to be measured, described air communication pipe series connection sedimentometer and fluid reservoir, described fluid connection pipe and air
Connect respectively communicating pipe sedimentometer and fluid reservoir, wherein fluid connection pipe is located at below liquid level, and air communication pipe is located in liquid level
Side.
As preferred：The sedimentometer includes shell and base, and sensor fibre, float and liquid, shell are provided with shell
Interior sensor fibre is provided with sensor fibre strain testing area-and sensor fibre temperature test area, and the float hangs on sense light
Below fine strain testing area and soak in a liquid.
As preferred：The sensor fibre is same fiber, and the sensor fibre beyond sedimentometer transmits for signal, is sunk
Sensor fibre strain testing area inside drop instrument is used for strain testing, and the sensor fibre temperature test area inside sedimentometer is used for warm
Degree test.
As preferred：To ensure under same temperature environment, the sensor fibre strain testing area and sensor fibre temperature are surveyed
The sensor fibre in examination area is not soaked in liquid.
As preferred：The sensor fibre is commercial single-mode fiber.
The present invention has the characteristics of following and beneficial effect：(1) single set system can realize long distance monitoring and transmission；
(2) system cost is low, and popularization and application feasibility is high；(3) sensor ends are simple without power supply and communication, system architecture；(4) it is distributed
Optical fiber has anti-electromagnetic interference capability, can the long-term reliable operation in the complicated metro environment of electromagnetic field.
Brief description of the drawings
Fig. 1 is that a kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing forms figure；
Fig. 2 is the structural representation of sedimentometer；
In figure：Distributive fiber optic strain analyzer 1, sensor fibre 2, sensor fibre strain testing area 2-1, sensor fibre temperature
Spend test section 2-2, sedimentometer 3, air communication pipe 4, fluid connection pipe 5, fluid reservoir 6, sedimentometer shell 7, float 8, liquid 9,
Mounting seat 10.
Embodiment
The present invention is described further with reference to embodiment.The explanation of following embodiments is only intended to help and understands this
Invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, also
Some improvement and modification can be carried out to the present invention, these are improved and modification also falls into the protection domain of the claims in the present invention
It is interior.
Referring to Figures 1 and 2, a kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing, including distribution
Fibre strain analyzer 1, sensor fibre 2 (sensor fibre strain testing area 2-1, sensor fibre temperature test area 2-2), sedimentometer
3, air communication pipe 4, fluid connection pipe 5, fluid reservoir 6.The sedimentometer 3 includes sedimentometer shell 7, float 8, the He of liquid 9
Mounting seat 10；
Described distributive fiber optic strain analyzer 1 is connected each sedimentometer using sensor fibre 2, passes through distribution
Formula fibre strain analyzer 1 tests out the strain of sensor fibre and temperature information in each sedimentometer 3；
Described sedimentometer 3 is installed on sedimentation region to be measured, air communication pipe 4 and fluid connection pipe 5 by sedimentometer 3 and storage
Flow container 6 is connected so that the liquid in sedimentometer 3 and fluid reservoir 6 is in sustained height.
When described sedimentometer 3 produces sedimentation, liquid level does not change, and the depth that float 8 is soaked in liquid 9 will become
Change, changed so as to the buoyancy of float 8, cause sensor fibre strain testing area 2-2 strain to change.
Sedimentometer be installed on needed in subway monitoring position, by sensor fibre 2 by each sedimentometer be attached and incite somebody to action
Signal is transmitted to distributive fiber optic strain analyzer 1.Air communication pipe 4 and fluid connection pipe 5 enter sedimentometer 3 and fluid reservoir 6
Row connection so that the liquid in sedimentometer 3 and fluid reservoir 6 is in sustained height.Fluid reservoir 6 is installed on the base for being not susceptible to sedimentation
On schedule, when somewhere sedimentometer 3 produces sedimentation, the liquid level of whole system hardly changes.
Sensor fibre 2 in sedimentometer 3 hangs a float, and the part of float 8 is soaked in liquid, and float 8 is by itself
Action of Gravity Field (FWeight) and buoyancy (FIt is floating), sensor fibre 2 is in initial stressed state (F), such as formula (1) and (2) institute
Show：
F=FWeight-FIt is floating (1)
FIt is floating=ρ Vg=ρ AHg (2)
In formula, ρ is the density of liquid, and V is the volume that float 8 is soaked in liquid, and g is acceleration of gravity, and A is float 8
Cross-sectional area, H are the depth that float 8 is soaked in liquid.
When sedimentometer 3 produces sedimentation (Δ H), the depth that float 8 is soaked in liquid also produces change (Δ H), so as to floating
The buoyancy of son 8 will change (Δ FIt is floating), the power suffered by sensor fibre 2 will produce the strain for changing (Δ F), i.e. sensor fibre 2
Change (Δ ε) by producing.As shown in formula (3) and (4)：
ΔFIt is floating=ρ A Δs Hg (3)
Δ F=SE Δs ε (4)
In formula, S is the cross-sectional area of sensor fibre 2, and E is the modulus of elasticity of sensor fibre 2, and Δ ε is answering for sensor fibre 2
Become variable quantity.
In the case where the gravity of float 8 is constant, the stress change of the buoyancy change as sensor fibre 2 of float 8, such as formula
(5) shown in：
ΔFIt is floating=Δ F (5)
Therefore, the settling amount of sedimentometer 3 can be as shown in formula (6)：
Analysis is demodulated to the strain of sensor fibre 2 by distributive fiber optic strain analyzer 1, so as to extrapolate sedimentometer
3 settling amount (Δ H).
Meanwhile sensor fibre 2 has long distance monitoring (>=50km) and (positioning of space orientation ability as distribution type fiber-optic
Precision≤1m), sedimentometer can be made a distinction by positioning the length of optical fiber, be sunk over long distances, on a large scale so as to realize
Drop monitoring.
One end sensor fibre temperature test area has been reserved in sedimentometer 3, has monitored the internal temperature of sedimentometer, for strain
Optical fiber carries out temperature-compensating.
Claims (5)
- A kind of 1. subway sedimentation monitoring system based on distributive fiber optic strain sensing, it is characterised in that：Including distribution type fiber-optic Strain analysis instrument (1), sensor fibre (2), sedimentometer (3), air communication pipe (4), fluid connection pipe (5) and fluid reservoir (6), institute The distributive fiber optic strain analyzer (1) stated forms a sensing testing light path with sensor fibre (2), to everywhere in light path Fibre strain and temperature are monitored, and described sedimentometer (3) is installed on region to be measured, the series connection of described air communication pipe (4) Sedimentometer (3) and fluid reservoir (6), described fluid connection pipe (5) and air communication pipe (4) connect respectively sedimentometer (3) and storage Flow container (6), wherein fluid connection pipe (5) are located at below liquid level, and air communication pipe (4) is located above liquid level.
- 2. the subway sedimentation monitoring system according to claim 1 based on distributive fiber optic strain sensing, it is characterised in that： The sedimentometer (3) includes shell (7) and base (10), and sensor fibre (2), float (8) and liquid (9) are provided with shell (7), Sensor fibre (2) in shell (7) is provided with sensor fibre strain testing area (2-1) and sensor fibre temperature test area (2-2), institute Float (8) is stated to hang on below sensor fibre strain testing area (2-1) and be immersed in liquid (9).
- 3. the subway sedimentation monitoring system according to claim 1 based on distributive fiber optic strain sensing, it is characterised in that： The sensor fibre (2) is same fiber, and the sensor fibre (2) beyond sedimentometer (3) transmits for signal, sedimentometer (3) Internal sensor fibre strain testing area (2-1) is used for strain testing, the internal sensor fibre temperature test area of sedimentometer (3) (2-2) is used for temperature test.
- 4. the subway sedimentation monitoring system according to claim 1 based on distributive fiber optic strain sensing, it is characterised in that： The sensor fibre (2) in the sensor fibre strain testing area (2-1) and sensor fibre temperature test area (2-2) is not soaked in liquid In.
- 5. the subway sedimentation monitoring system according to claim 1 based on distributive fiber optic strain sensing, it is characterised in that： The sensor fibre (2) is commercial single-mode fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720341921.3U CN206683627U (en) | 2017-04-01 | 2017-04-01 | Subway sedimentation monitoring system based on distributive fiber optic strain sensing |
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| CN201720341921.3U CN206683627U (en) | 2017-04-01 | 2017-04-01 | Subway sedimentation monitoring system based on distributive fiber optic strain sensing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767691A (en) * | 2017-04-01 | 2017-05-31 | 浙江大学城市学院 | A kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing |
| CN108592871A (en) * | 2018-04-28 | 2018-09-28 | 中国石油天然气集团有限公司 | Storage tank optic foundation settlement detector and system |
-
2017
- 2017-04-01 CN CN201720341921.3U patent/CN206683627U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767691A (en) * | 2017-04-01 | 2017-05-31 | 浙江大学城市学院 | A kind of subway sedimentation monitoring system based on distributive fiber optic strain sensing |
| CN108592871A (en) * | 2018-04-28 | 2018-09-28 | 中国石油天然气集团有限公司 | Storage tank optic foundation settlement detector and system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20171128 Termination date: 20210401 |