CN101923057B - BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor - Google Patents
BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor Download PDFInfo
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- CN101923057B CN101923057B CN2010101596409A CN201010159640A CN101923057B CN 101923057 B CN101923057 B CN 101923057B CN 2010101596409 A CN2010101596409 A CN 2010101596409A CN 201010159640 A CN201010159640 A CN 201010159640A CN 101923057 B CN101923057 B CN 101923057B
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Abstract
The invention discloses a BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor, realizing the corrosion monitoring by adopting a cheap single-mode communication optical fiber as a sensing element. The sensor is used for measuring the corrosion destructive degree of a structure and comprises a rebar, a permeable layer, an organic glass blade, a lubricating layer, a bare fiber, an armored cable, and a permeable packing box. A manufacture method of the sensor comprising the steps of: covering the permeable layer on the rebar, uniformly clamping the rebar by using the organic glass blade, winding the bare fiber on the organic glass blade covered with the lubricating layer, connecting the bare fiber and the armored cable, and finally packing with the permeable packing box and leading out the armored cable through an leading-out end. The sensor is applicable to the structural health monitoring of the civil engineering, such as a concrete dam, and the interiors of some structures suffered from corrosion frequently, has simple process, convenient arrangement and high precision, and is suitable to industrialization production.
Description
Technical field
The present invention is a kind of sensor that uses optical fiber to monitor reinforced concrete structure reinforcement corrosion degree; Be exactly through strain sensing technology specifically, utilize and twine the measurement of cheap single mode communication optical fiber realization the strain of reinforcement corrosion after expansion based on optical fiber BOTDR (Brillouin light domain reflectometer).Through producing volumetric expansion strain phenomenon after the monitoring reinforcement corrosion, realize Quantitative Monitoring to the reinforcement corrosion degree.
Background technology
Optical fiber is the desirable sensing element that is used for long term monitoring, and it has advantages such as stable performance, multiparameter and distribution measuring, thereby in the monitoring structural health conditions sensing technology, extremely payes attention in recent years.Though the time of Fibre Optical Sensor research is not long, makes progress very fast.
(Brillouin Optical Time-Domain Relectometer, measuring technique BOTDR) is a sophisticated technology that is used for optical communication and monitoring structural health conditions that just occurs for over ten years in the world to the Brillouin light domain reflectometer.Brillouin scattering is that incident light wave and sound wave interact and a kind of inelastic scattering of generation, and the stokes light that in scattering process, produces has a frequency displacement with respect to pump light, becomes Brillouin shift.The Brillouin shift amount that scattering produces is directly proportional with the velocity of sound in the optical fiber.And the refractive index in the optical fiber and the velocity of sound are all relevant with the temperature of optical fiber and suffered factors such as stress, based on this principle, can realize the monitoring to strain and temperature through the measurement to the Brillouin shift amount.With the traditional monitoring compared with techniques; The BOTDR technology has advantages such as distributed monitoring, long distance, corrosion-resistant and anti-electromagnetic interference (EMI); Can directly utilize common communication optical fiber directly to monitor demodulation, realize that kilometer level range inner fiber receives the continuous distribution formula measurement of strain and temperature as sensor.The most significant advantage of BOTDR technology is exactly stress, the temperature information that can measure exactly on the optical fiber any point along the line.If be laid to the netted monitoring net that just can possess certain scale with optical fiber is crisscross, realize comprehensive monitoring to monitoring target, overcome the drawback of conventional port monitoring omission, improve the success ratio of monitoring.
Optical fiber is cheap in the reality, is easy to form large-scale production, so it has good practicality, compares with fiber grating to have more generalization.
Summary of the invention
The technical matters that the present invention will solve provides the sensor that a kind of monitoring of structures receives extent of corrosion; This corrosion sensor has good precision; Can satisfy requirement of engineering, owing to adopt the single mode communication optical fiber as sensing element, cost is cheaper than existing fiber grating corrosion sensor.
Technical scheme of the present invention is following:
This corrosion sensor comprises: deformed bar, pervious bed, organic glass blade, lubricating layer, bare fibre, armouring optical cable, permeable enclosure.At first add on the deformed bar and cover pervious bed, the organic glass blade) clamp deformed bar and pervious bed; Add lubricating layer on the organic glass blade, bare fibre evenly is wrapped on the lubricating layer closely; Connect bare fibre and armouring optical cable, bare fibre is wrapped on the organic glass blade of lubricating layer covering, with the permeable enclosure encapsulation in hole with holes, draws the armouring optical cable at exit then.
The invention has the beneficial effects as follows that technology is simple, be suitable for industrialization production, with low cost; Can use a signal processing and analysis device and realize monitoring a plurality of corrosion sensors; Sensor is laid convenient, fast, easy operating, and measuring accuracy is high.
Description of drawings
Fig. 1 is the Fibre Optical Sensor skeleton view.
Fig. 2 is the Fibre Optical Sensor transverse cross-sectional view.
Fig. 3 is the Fibre Optical Sensor longitudinal sectional drawing.
Among the figure: 1 deformed bar; 2 pervious beds; 3 organic glass blades; 4 lubricating layers; 5 bare fibres; 6 armouring optical cables; 7 permeable enclosure.
Embodiment
Be described in detail specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The fiber optical corrosive sensor construction constitutes like Fig. 1, Fig. 2 and shown in Figure 3, and this corrosion sensor comprises: 1 deformed bar; 2 pervious beds; 3 organic glass blades; 4 lubricating layers; 5 bare fibres; 6 armouring optical cables; 7 permeable enclosure.At first on deformed bar, add and cover pervious bed; Evenly clamp deformed bar to the organic glass blade afterwards; Be wrapped in bare fibre on the organic glass blade of lubricating layer covering again; Connect bare fibre and armouring optical cable then, draw the armouring optical cable at last with permeable enclosure encapsulation, and through exit.
Claims (1)
1. a BOTDR fiber optical corrosive sensor comprises deformed bar (1), pervious bed (2), organic glass blade (3), lubricating layer (4), bare fibre (5), armouring optical cable (6) and permeable enclosure (7); It is characterized in that:
Add on the deformed bar (1) and cover pervious bed (2), organic glass blade (3) is clamped deformed bar (1) and pervious bed (2); Add lubricating layer (4) on the organic glass blade (3), bare fibre evenly is wrapped on the lubricating layer closely; Connect bare fibre (5) and armouring optical cable (6), bare fibre (5) is wrapped on the organic glass blade of lubricating layer covering, uses permeable enclosure (7) encapsulation in hole with holes then, draws armouring optical cable (6) at exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101596409A CN101923057B (en) | 2010-04-29 | 2010-04-29 | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101596409A CN101923057B (en) | 2010-04-29 | 2010-04-29 | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101923057A CN101923057A (en) | 2010-12-22 |
| CN101923057B true CN101923057B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101596409A Expired - Fee Related CN101923057B (en) | 2010-04-29 | 2010-04-29 | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288534B (en) * | 2011-05-10 | 2012-11-21 | 大连理工大学 | Fiber grating reinforced concrete rusting sensor with temperature compensation |
| CN102288610B (en) * | 2011-07-19 | 2013-10-02 | 武汉理工大学 | Method for packaging steel bar corrosion optical fiber sensor with permeable mortar |
| CN103217109B (en) * | 2013-04-09 | 2016-11-23 | 河海大学 | A kind of Crack Monitoring sensor based on OTDR technique and using method thereof |
| CN107843358A (en) * | 2017-12-04 | 2018-03-27 | 中国电建集团中南勘测设计研究院有限公司 | A kind of concrete abrasion early warning system and method |
| CN109406528B (en) * | 2018-09-07 | 2021-03-02 | 昆明理工大学 | Optical fiber sensing device for detecting corrosion of steel bar and temperature compensation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10197298A (en) * | 1997-01-14 | 1998-07-31 | Keisoku Gihan Kk | Method for measuring variable state of baserock, slope soil structure and civil engineering structure |
| US6813403B2 (en) * | 2002-03-14 | 2004-11-02 | Fiber Optic Systems Technology, Inc. | Monitoring of large structures using brillouin spectrum analysis |
| JP4425845B2 (en) * | 2005-09-29 | 2010-03-03 | 株式会社日立エンジニアリング・アンド・サービス | Artificial barrier environment monitoring device |
| CN101275916B (en) * | 2008-04-25 | 2011-11-02 | 东南大学 | Distributed type non-slippage optical fiber strain sensor and manufacturing method thereof |
| CN201653921U (en) * | 2010-04-29 | 2010-11-24 | 大连理工大学 | BOTDR fiber corrosion sensor |
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2010
- 2010-04-29 CN CN2010101596409A patent/CN101923057B/en not_active Expired - Fee Related
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| CN101923057A (en) | 2010-12-22 |
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Granted publication date: 20120704 |