CN202361956U - FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof - Google Patents
FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof Download PDFInfo
- Publication number
- CN202361956U CN202361956U CN2011204415176U CN201120441517U CN202361956U CN 202361956 U CN202361956 U CN 202361956U CN 2011204415176 U CN2011204415176 U CN 2011204415176U CN 201120441517 U CN201120441517 U CN 201120441517U CN 202361956 U CN202361956 U CN 202361956U
- Authority
- CN
- China
- Prior art keywords
- gauge length
- long gauge
- optical fibre
- length optical
- fibre grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an FBG (fiber bragg grating) scouring sensor with a long gauge length and a scouring monitoring system thereof. The FBG scouring sensor with the long gauge length, disclosed by the utility model, comprises an elastic straight rod and an FBG sensing probe array with the long gauge length which is integrally packaged with the elastic straight rod; the FBG sensing probe array with the long gauge length is positioned at one side of the elastic straight rod; the FBG sensing probe array with the long gauge length comprises a plurality of FBG sensing probes with the long gauge length; and the plurality of FBG sensing probes with the long gauge length are sequentially connected in series. The FBG scouring sensor disclosed by the utility model has a simple and reliable scouring principle; according to the FBG scouring sensor disclosed by the utility model, the sensor fabrication technology is simple, and the cost is relatively low; the FBG scouring sensor has a good durability and a good environmental suitability; the FBG scouring sensor is high in test precision, the test precision can reach 0.05 mm, even smaller; the precision can be changed according to specific requirements; and according to the FBG scouring sensor, temperature compensation problems are unnecessary to consider, so that a test becomes simple and effective.
Description
Technical field
The utility model relates to the monitoring device of a kind of building, traffic engineering, is specifically related to long gauge length optical fibre grating scour sensor and flushing monitoring system thereof.
Background technology
In engineerings such as water conservancy, taking and discharging, Haihe River bunding dam protection, bridge, ocean platform, current to wash away the phenomenon that structure is damaged quite general.The ground of structure often makes its intensity reduce owing to the erosion of current, brings hidden danger to the safety of structure, and because washing away all under water of current generally is difficult to discovery in time.Yet structure is in case owing to wash away when produce destroying, and often causing all is such as serious accident such as collapsing, the property and the life security that jeopardize broad masses of the people.Have data to show, the collapse accident of about bridge block more than 1000 that the U.S. took place in the past in 30 years has 60% to be because due to the erosion damage of bridge pier.In addition, current are to the safety that also will threaten dykes and dams of washing away of sea, bank levee dam foundation plinth, and ocean current is to the safety that has then threatened ocean platform of washing away of offshore platform foundation.Because the structural safety problem that causes of current scour, paid more and more attention, the flushing monitoring of structure has become an important task in the monitoring structural health conditions.
For the measurement of scour depth, mainly contain topographic staff, Sounding Rod, gauge bob, sounding appearance, sonar etc., but these methods all has significant limitation in practical engineering application at present.Many-sided restriction that the depth measurement of topographic staff, Sounding Rod, gauge bob usually receives landform, environment, fathom etc., and sounding appearance, sonar etc. are subject to noise, nor be convenient to continuous monitoring.
Fiber grating is because precision is high, and strain measurement can reach 1 μ ε, and ability waterproof after the encapsulation; Corrosion-resistant, long-term behaviour is relatively good, can not only sensing; And can be used to transmit data, and be beneficial to networking and monitoring in real time, be widely used in the health monitoring of structure at present.In order to improve authenticity, reliability and the noise robustness of structural strain test, Southeast China University has developed the long gauge length optical fibre grating strain transducer, and successfully applies in the health monitoring of structure.Exploitation based on the various kinds of sensors of fiber grating is carried forward vigorously, but also few at present for the research of the problem of washing away based on fiber grating.At present domestic have only Dalian University of Technology to develop a kind of scour sensor based on conventional point type fiber grating; Its sensing probe is in case owing to wash away when exposing the riverbed, and the sensor both sides will produce flowing pressure, and the diaphragm generation of sensing probe device both sides is out of shape; The motion of drivening rod; And drive the beam of uniform strength generation deflection in the device then, and,, judgement washes away thereby having or not by being encapsulated in its strain of beam of uniform strength FBG monitoring.Its principle is owing to cylinder in moving water streams, and produces positive and negative flowing pressure respectively at its fluoran stream surface and lee side, makes the beam of uniform strength deform.But this sensor process is complicated, and cost is quite high, but precision can only reach 0.2m; And its metal shell and wire netting sheet be easy to get rusty in water, poor corrosion resistance, and the fiber pigtail of each sensing probe on its sensor all need be drawn in addition; Increased taking to modulation (FBG) demodulator interface; Detect when being unfavorable for a plurality of sensor and monitoring, and also must also there be certain limitation the position of its installation to the position at the upper reaches of architecture basics.The scour sensor of Dalian University of Technology design also is based on the conventional port sensing mode and carries out strain measurement, at home and abroad retrieves and does not still have related patent U.S. Patent No. and pertinent literature for utilizing the long gauge length optical fibre grating to carry out distributed sensing research problem of washing away at present.
The utility model content
To the deficiency that prior art exists, the utility model purpose provides a kind of have pinpoint accuracy, high-durability, temperature self-adaptation, simple in structure, cheap long gauge length optical fibre grating scour sensor and flushing monitoring system thereof.
To achieve these goals, the utility model is to realize through following technical scheme:
The long gauge length optical fibre grating scour sensor of the utility model comprises Elastic Straight and the long gauge length optical fibre grating sensing linear transducer array that is packaged as a whole with Elastic Straight, and long gauge length optical fibre grating sensing linear transducer array is positioned at the side of Elastic Straight; Long gauge length optical fibre grating sensing linear transducer array comprises a plurality of long gauge length optical fibre grating sensing probes, the series connection successively of a plurality of long gauge length optical fibre grating sensing probes.
Above-mentioned Elastic Straight comprises sensing section and the anchoring section that is positioned at sensing section bottom; Long gauge length optical fibre grating sensing linear transducer array is installed on the sensing section, and anchoring section is provided with a plurality of overhead kicks obliquely.
Above-mentioned long gauge length optical fibre grating sensing probe comprises sleeve pipe, is encapsulated in the optical fiber in the sleeve pipe and is scribed at the grating on the optical fiber that the two ends of optical fiber are separately fixed at the two ends of sleeve pipe.
The material that above-mentioned Elastic Straight adopts is a fiber-reinforced plastic.
The flushing monitoring system that the long gauge length optical fibre grating scour sensor of the utility model constitutes comprises a plurality of (at least two) long gauge length optical fibre grating scour sensor of laying according to required flushing monitoring point; A plurality of long gauge length optical fibre grating scour sensors are connected successively, and last long gauge length optical fibre grating scour sensor is connected to signal reception base through Transmission Fibers or is dissolved in the structural healthy monitoring system.
The beneficial effect of the utility model is following:
(1) the utility model to wash away principle simple and reliable, the method for testing novelty is ingenious.The utility model mainly is to utilize current the Elastic Straight effect to be made the long gauge length optical fibre grating wavelength that is positioned at the mud layer top that is laid on the Elastic Straight by effects of strain bigger variation takes place, thereby obtains scour depth; Also the natural vibration frequency of Elastic Straight capable of using obtains scour depth along with washing away the characteristic that progressively diminishes simultaneously;
(2) the long gauge length optical fibre grating scour sensor manufacture craft of the utility model is simple, and cost is compared comparatively cheap.The utility model mainly contains an Elastic Straight and a plurality of long gauge length optical fibre grating sensing probe is formed, and makes simply, and it is convenient, with low cost to lay, and has broad application prospects and good economic benefit;
(3) because the long gauge length optical fibre grating scour sensor of the utility model has adopted compound substance and epoxy encapsulation; Superior performances such as it is antirust, corrosion-resistant that it is water-fast; And be not afraid of electromagnetic screen and interference; Integrated encapsulation can be applicable to any environment that washes away later on especially, has the permanance and the extensive applicability of overlength;
(4) measuring accuracy of the utility model is high, and its measuring accuracy can reach 0.05m, even littler, and possibly change precision according to specific requirement, and its precision mainly can realize through the gauge length that changes long gauge length optical fibre grating sensing probe;
(5) the utility model has been used long gauge length optical fibre grating sensing linear transducer array; The test of its scour depth mainly is based on the mud layer top and confirms with the long gauge length optical fibre grating sensing probe strain relative value of mud layer below or the natural frequency variation of straight-bar; Therefore need not the account temperature compensation problem, make test effectively simple;
(6) the utility model need not the installation site is limited, as long as guaranteeing that current can drive partly inserts the riverbed Elastic Straight and bend and vibrate, and makes long gauge length optical fibre grating sensing linear transducer array be positioned at fluoran stream surface to get final product.
(7) the utility model can carry out flushing monitoring simultaneously to multiple spot, can be according to monitoring requirements, and the implanted sensor in a plurality of monitoring points is realized the whole flushing monitoring in a zone.
Description of drawings
Fig. 1 is the long gauge length optical fibre grating scour sensor schematic diagram of the utility model;
Fig. 2 is the long gauge length optical fibre grating sensing linear transducer array structural representation of the utility model;
Fig. 3 is that the long gauge length optical fibre grating scour sensor of the utility model is installed artwork;
Fig. 4 is the flushing monitoring system architecture synoptic diagram of the utility model.
Each label among the figure: sensing section 11, anchoring section 12, overhead kick 13; Long gauge length optical fibre grating sensing linear transducer array 2, long gauge length optical fibre grating sensing probe 20, optical fiber 21; Grating 22, sleeve pipe 23, steel pipe 3; Long gauge length optical fibre grating scour sensor 4, Transmission Fibers 5, signal receives base or structural healthy monitoring system 6.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with embodiment, further set forth the utility model.
Referring to Fig. 1 and Fig. 2; The long gauge length optical fibre grating scour sensor 4 of the utility model comprises Elastic Straight and the long gauge length optical fibre grating sensing linear transducer array 2 that is packaged as a whole with Elastic Straight; Long gauge length optical fibre grating sensing linear transducer array 2 is positioned at the side of Elastic Straight, and fiber pigtail is drawn at the top.The long gauge length optical fibre grating scour sensor 4 that encapsulation forms has good permanance to environment.
That long gauge length optical fibre grating sensing linear transducer array 2 comprises is a plurality of (two and more than) long gauge length optical fibre grating sensing probe 20, a plurality of long gauge length optical fibre grating sensings probes 20 are connected successively.
The two ends of each long gauge length optical fibre grating sensing probe 20 all are fixed on the side of Elastic Straight; Long gauge length optical fibre grating sensing probe 20 comprises sleeve pipe 23, be encapsulated in optical fiber 21 in the sleeve pipe 23, be scribed at the grating 22 on the optical fiber 21 and be encapsulated in the compound substance protective seam on the sleeve pipe 23; The two ends of optical fiber 21 are separately fixed at the two ends of sleeve pipe 23; Grating 22 can be free to slide in sleeve pipe 23, and the distance between two point of fixity is the gauge length of setting.
The number of the length of gauge length and long gauge length optical fibre grating sensing probe 20 can be provided with according to user's requirement.
Elastic Straight comprises sensing section 11 and the anchoring section 12 that is positioned at sensing section 11 bottoms, and the diameter of sensing section 11 is less than the diameter of anchoring section 12; Long gauge length optical fibre grating sensing linear transducer array 2 is installed on the sensing section 11, overhead kick 13 obliquely that anchoring section 12 is provided with a plurality of (more than two and two).
The method for making of the long gauge length optical fibre grating scour sensor 4 of the utility model comprises following step:
(a1) make the Elastic Straight that rigidity is moderate, slight bending can take place in Elastic Straight under the effect of current, at the anchoring section 12 of Elastic Straight a plurality of overhead kicks 13 obliquely is set;
(a2) make long gauge length optical fibre grating sensing linear transducer array 2:
At first make long gauge length optical fibre grating sensing probe 20, then a plurality of (more than two and two) long gauge length optical fibre grating sensing probe 20 is connected successively, fiber pigtail is drawn from the top, forms long gauge length optical fibre grating sensing linear transducer array 2;
The method for making of long gauge length optical fibre grating sensing probe 20 comprises following step:
(a21) with optical fiber 21 threadings 23;
(a22) in sleeve pipe 23 coated outside compound substances and saturated ring epoxy resins, encapsulate;
(a23) two ends with optical fiber 21 fix through the two ends of fixed glue and sleeve pipe 23 respectively, and the optical fiber of remainder can be free to slide in sleeve pipe 23.
(a3) at first long gauge length optical fibre grating sensing linear transducer array 2 is installed on sensing section 11 sides of Elastic Straight; Then long gauge length optical fibre grating sensing linear transducer array 2 is adopted epoxy resin and is packaged as a whole with Elastic Straight, form final long gauge length optical fibre grating scour sensor 4.
Referring to Fig. 3, the installation distribution method of the long gauge length optical fibre grating scour sensor 4 of the utility model comprises following step:
(b1) the moderate hollow steel pipe 3 of a thickness is enclosed within on the Elastic Straight; Wherein the interior diameter of steel pipe 3 is greater than the overall diameter of sensing section 11; And the overall diameter of steel pipe 3 is close with the diameter of anchoring section 12, and steel pipe 3 is enclosed within on the sensing section 11 and steel pipe 3 ends prop up anchoring section 12;
(b2) with steel pipe 3 together with long gauge length optical fibre grating scour sensor 4 together insertion need the position of monitoring; And make the one side that long gauge length optical fibre grating sensing linear transducer array 2 is installed on the long gauge length optical fibre grating scour sensor 4 be arranged on (facing to the direction of flow) on the fluoran stream surface of current; Can obtain the initial absolute altitude in riverbed through initial measurement; Through long-term flushing monitoring, can obtain the situation of washing away of each monitoring location.
(b3) continue hammering steel pipe 3; Make steel pipe 3 drive long gauge length optical fibre grating scour sensor 4 and insert the mud layer place; Until the major part of long gauge length optical fibre grating sensing linear transducer array 2 below mud layer; The position of fraction above mud layer extracted steel pipe 3 then, accomplishes single long gauge length optical fibre grating scour sensor 4 final installations and lays.
Referring to Fig. 4; The flushing monitoring system of the utility model comprises two long gauge length optical fibre grating scour sensors 4 laying according to required flushing monitoring point; Two long gauge length optical fibre grating scour sensors 4 are connected successively; Last (among Fig. 4 the right one) long gauge length optical fibre grating scour sensor 4 is connected to existing signal through Transmission Fibers 5 and receives the base or be dissolved in the structural healthy monitoring system 6, and is simple and convenient.
In the present embodiment, the material that Elastic Straight adopts is fiber-reinforced plastic (being called for short FRP).
The principle of work of the utility model long gauge length optical fibre grating scour sensor 4 is following:
The long gauge length optical fibre grating scour sensor 4 of the utility model mainly utilizes grating 22 to carry out for the susceptibility of strain; Among the long gauge length optical fibre grating sensing is popped one's head in 20 insertion riverbeds; Current will make the part of not inserting in the mud layer of Elastic Straight take place constantly to rock with the obvious bending of water (flow) direction and with the current variation; And the part below mud layer does not bend basically; Therefore bigger strain will appear in the grating 22 of mud layer top, and constantly fluctuation on time-histories, also will occur, and the grating 22 that is in the mud layer below does not then have strain variation basically; Wavelength characteristic through grating 22 in the long gauge length optical fibre grating scour sensor 4 of mud layer above and below can be judged the height of the interface of mud layer and water, thereby draws the degree of depth of washing away.Simultaneously, the riverbed is through after washing away, and Elastic Straight is exposed the mud layer part and will be increased; Make its natural vibration frequency reduce; Therefore calculate its natural vibration frequency through the strain TIME HISTORY SIGNAL of testing sensor, not only can judge to have or not and wash away, can also confirm scour depth.These two kinds of judgements and computing method can be used separately, use the accuracy that then can improve its judgement and evaluation simultaneously.
More than show and described ultimate principle of the utility model and the advantage of principal character and the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.
Claims (5)
1. long gauge length optical fibre grating scour sensor is characterized in that, comprises Elastic Straight and the long gauge length optical fibre grating sensing linear transducer array (2) that is packaged as a whole with Elastic Straight, and said long gauge length optical fibre grating sensing linear transducer array (2) is positioned at the side of Elastic Straight;
Said long gauge length optical fibre grating sensing linear transducer array (2) comprises a plurality of long gauge length optical fibre grating sensing probes (20), and said a plurality of long gauge length optical fibre grating sensing probes (20) are connected successively.
2. long gauge length optical fibre grating scour sensor according to claim 1 is characterized in that, said Elastic Straight comprises sensing section (11) and is positioned at the anchoring section (12) of sensing section (11) bottom;
Said long gauge length optical fibre grating sensing linear transducer array (2) is installed on the sensing section (11), and said anchoring section (12) is provided with a plurality of overhead kicks (13) obliquely.
3. long gauge length optical fibre grating scour sensor according to claim 1; It is characterized in that; Said long gauge length optical fibre grating sensing probe (20) comprises sleeve pipe (23), is encapsulated in the optical fiber (21) in the sleeve pipe (23) and is scribed at the grating (22) on the optical fiber (21) that the two ends of said optical fiber (21) are separately fixed at the two ends of sleeve pipe (23).
4. long gauge length optical fibre grating scour sensor according to claim 1 is characterized in that, the material that said Elastic Straight adopts is a fiber-reinforced plastic.
5. by any flushing monitoring system that said long gauge length optical fibre grating scour sensor constitutes of claim 1～4, it is characterized in that,
Comprise a plurality of long gauge length optical fibre grating scour sensors (4) of laying according to required flushing monitoring point; A plurality of said long gauge length optical fibre grating scour sensors (4) are connected successively, and last said long gauge length optical fibre grating scour sensor (4) is connected to signal reception base through Transmission Fibers (5) or is dissolved in the structural healthy monitoring system (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204415176U CN202361956U (en) | 2011-11-09 | 2011-11-09 | FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204415176U CN202361956U (en) | 2011-11-09 | 2011-11-09 | FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202361956U true CN202361956U (en) | 2012-08-01 |
Family
ID=46573137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204415176U Expired - Fee Related CN202361956U (en) | 2011-11-09 | 2011-11-09 | FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202361956U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398210A (en) * | 2019-08-23 | 2019-11-01 | 山东大学 | A kind of offshore wind turbine soil body scour depth monitoring rod, device and monitoring method |
| CN111707208A (en) * | 2020-06-24 | 2020-09-25 | 东南大学 | Cylindrical shell structure cross section deformation monitoring method based on distributed macro strain sensing |
-
2011
- 2011-11-09 CN CN2011204415176U patent/CN202361956U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398210A (en) * | 2019-08-23 | 2019-11-01 | 山东大学 | A kind of offshore wind turbine soil body scour depth monitoring rod, device and monitoring method |
| CN111707208A (en) * | 2020-06-24 | 2020-09-25 | 东南大学 | Cylindrical shell structure cross section deformation monitoring method based on distributed macro strain sensing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102445160A (en) | Long-gauge fiber grating scour sensor, manufacturing method thereof, and installation and laying method thereof, and scour monitoring system formed by long-gauge fiber grating scour sensors | |
| Wu et al. | Optical fiber-based sensing, measuring, and implementation methods for slope deformation monitoring: A review | |
| CN105890537B (en) | The technical solution and system of the distributing optical fiber sensing of induced joint deformation monitoring | |
| CN105300554B (en) | Multifunctional marine environment monitoring device and method based on distributing optical fiber sensing | |
| CN103700221B (en) | A kind of oil and gas pipes mountain flood monitoring method | |
| CN101122478A (en) | Optical fibre grating flushing monitoring sensor and its manufacture method | |
| CN207244680U (en) | A kind of sunk bridge pile foundation washes away real-time monitoring system | |
| CN105971647B (en) | A kind of multi-functional FRP intelligent anchor rods of single-point temperature compensation and preparation method thereof | |
| CN107460898A (en) | A kind of sunk bridge pile foundation washes away real-time monitoring system and its monitoring method | |
| CN106917420B (en) | A kind of pile foundation scour monitoring device | |
| CN103076063B (en) | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof | |
| CN204730824U (en) | A kind of distributed settlement measuring device | |
| CN105973285A (en) | Multifunctional intelligent anchor pole and installation arrangement method thereof | |
| TW201231938A (en) | Monitoring system and method for riverbed scouring depth and stream speed silt concentration | |
| CN106225818A (en) | A kind of single-point temperature compensation multifunctional intellectual anchor pole and installation distribution method thereof | |
| CN103323385A (en) | Fiber anchor pole corrosion sensor | |
| CN102288147A (en) | Device for measuring scouring depth monitored based on active temperature control distributed temperature | |
| CN203259452U (en) | Fiber anchor rod corrosion sensor | |
| CN106225817A (en) | A kind of multi-functional FRP intelligent anchor rod of multiple spot temperature compensation | |
| CN106092160A (en) | A kind of manufacture method of the multi-functional FRP intelligent anchor rod of multiple spot temperature compensation | |
| CN202361956U (en) | FBG (fiber bragg grating) scouring sensor with long gauge length and scouring monitoring system thereof | |
| CN103852013A (en) | Slip mass deep displacement sensor based on fiber bragg grating displacement detection | |
| CN205895283U (en) | Multi -functional FRP intelligence stock of single -point temperature compensation | |
| CN207215329U (en) | A kind of miniature steel pipe pile pile stress test device | |
| CN101799295A (en) | Electronic bathymeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20121109 |