CN104776808A - Fiber grating sensor for monitoring the strain of the outer wall of high-temperature pressure pipeline online - Google Patents
Fiber grating sensor for monitoring the strain of the outer wall of high-temperature pressure pipeline online Download PDFInfo
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- CN104776808A CN104776808A CN201410014287.3A CN201410014287A CN104776808A CN 104776808 A CN104776808 A CN 104776808A CN 201410014287 A CN201410014287 A CN 201410014287A CN 104776808 A CN104776808 A CN 104776808A
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Abstract
The invention belongs to the technical field of fiber grating sensing, and specifically relates to a fiber grating sensor for monitoring the strain of the outer wall of a high-temperature pressure pipeline online. The fiber grating sensor comprises a direct sensing arm, a rhombus base body, an indirect sensing arm, and a high temperature resistant fiber Bragg grating. The direct sensing arm, the rhombus base body and the indirect sensing arm are of an integrated metal substrate structure, and a material consistent with the material of the high temperature pressure pipeline is selected to the greatest degree. The high temperature resistant fiber Bragg grating is fixed in an olive groove of the indirect sensing arm through a low-temperature glass welding material, and the rhombus base body has an inner angle of 60 degrees in the direction of the direct sensing arm. The fiber grating sensor for monitoring the strain of the outer wall of a high-temperature pressure pipeline online of the invention can be used to monitor the safety state of a high-temperature pressure pipeline and other high-temperature devices online under the temperature of 300 DEG C, and can discover a strain abnormity point in advance and remind an enterprise to timely restore or replace related equipment, thereby avoiding the occurrence of a pipeline explosion accident.
Description
Technical field
The present invention relates to fiber grating sensing technology field, particularly relate to the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring, be suitable for carrying out strain on-line monitoring to various high-temperature component surfaces such as high temperature pressure pipelines.
Background technology
Find the photosensitivity of optical fiber from people such as K.O.Hill in 1978 and utilize longitudinal standing wave wrting method to make in the world since first Fiber Bragg Grating FBG, fiber grating with its essential safety, quality is light, volume is little, by electromagnetic interference (EMI), be easy to multiplexing, can the particular advantages such as remote measurement and being used widely at sensory field at a distance, become one of main flow direction that current sensing technology develops.
The safety monitoring technology means of current high temperature pressure pipeline mainly comprise: electric sensor detection method, ultrasonic detection method and infrared thermal imaging testing method.Because high temperature pressure pipeline inside is generally inflammable and explosive danger medium, any faint electric spark all may cause pipeline to fire, and therefore electrical sensor is not suitable for carrying out safety monitoring to high temperature pressure pipeline; Based on ultrasonic detection method and the infrared thermal imaging testing method of Non-Destructive Testing theory, although avoid the defect of electric sensor, can only the crack of testing pipes inwall and the air blister defect etc. of material but ultrasonic detection method is limited to its principle of work, strain on-line monitoring can not be carried out to high temperature pressure pipeline surface; And infrared thermal imaging testing method resolution is lower, inner pit and wall thickness defect can only be detected, equally cannot the outer wall strain variation of testing pipes in real time.
Mass data result shows, manufacture the prerequisite of birth defect and human error operation in purging line under, the main cause of pipe leakage and pipe explosion accident is caused to be high-temerature creep and the wall erosion of pipeline material, and be no matter high-temerature creep or the wall erosion of pipeline material, its external effect all can cause the obvious strain of pipeline outer wall, finally causes pipe leakage or explosion.Theoretical analysis based on the mechanics of materials can draw, the outer wall inefficacy strain of high temperature pressure pipeline is a non-linear process, the i.e. more close inefficacy explosion of pipeline, the strain rate of its outer wall is faster, therefore by the outer wall inefficacy strain regime of monitoring high temperature pressure pipeline, can know the safety case of pipeline, find the strain abnormality point of high temperature pressure pipeline in advance, remind enterprise repair in time or change high temperature pressure pipeline, guarantee high temperature pressure pipeline safe operation, avoid the generation of pipe explosion accident.
Summary of the invention
In view of the urgency of monitoring high temperature pressure pipeline safety case, a kind of high temperature pressure pipeline outer wall is the object of the present invention is to provide to strain the fiber-optic grating sensor of on-line monitoring, by carrying out real-time strain monitoring to high temperature pressure pipeline outer wall surface, the safety case of high temperature pressure pipeline can be monitored.By choosing applicable high-temperature resistant optical fiber grating, basal body structure and material, enhanced sensitivity and the effect temperature compensation of fiber-optic grating sensor can be realized.
The invention provides the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring, described fiber-optic grating sensor comprises direct pick-up arm, rhombus matrix, indirect sensing arm and high-temperature resistant optical fiber Bragg grating.
For achieving the above object, the present invention takes following technical scheme:
The metallic base structure that described direct pick-up arm, rhombus matrix and indirect sensing arm are integrated, its material selects the material consistent with high temperature pressure pipeline as far as possible.
Described rhombus matrix, in the rhombus in its direct pick-up arm direction, angle is less than 90 °, to play the effect of strain sensitization.
In described indirect sensing arm, the position of bonding fiber grating is olive shape.
Described high-temperature resistant optical fiber Bragg grating is the special optical fiber Bragg grating of polyimide coat.
Described high-temperature resistant optical fiber Bragg grating is fixed in the olive groove of indirect sensing arm by low temperature glass solder.
The fusing point of described low temperature glass solder is 350 DEG C ~ 400 DEG C.
When described high-temperature resistant optical fiber Bragg grating is bonded on indirect sensing arm, need to apply suitable prestretching, to ensure that sensor has two-way strain sensing ability.
The fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring of the present invention, by to the Rational choice of materials and structures and design, can while high temperature resistant 300 DEG C, improve the strain sensitivity of sensor, on-line monitoring is carried out to the safety case of high temperature pressure pipeline, and by connecting multiple monitoring sensor, forms sensor network, while reduction system average unit cost, multiple spot real-time telemetry can be carried out to whole high temperature pressure pipeline system.
Accompanying drawing explanation
Fig. 1 is the fiber-optic grating sensor schematic diagram of described a kind of high temperature pressure pipeline outer wall strain on-line monitoring
Fig. 2 is described fiber-optic grating sensor processing platform schematic diagram
Fig. 3 is the particular location schematic diagram of fiber-optic grating sensor relative to high temperature pressure pipeline of installation
Embodiment
The fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring of the present invention, comprise direct pick-up arm (11), rhombus matrix (12), indirect sensing arm (13) and high-temperature resistant optical fiber Bragg grating (14), the metallic base structure that wherein direct pick-up arm (11), rhombus matrix (12) and indirect sensing arm (13) are integrated; High-temperature resistant optical fiber Bragg grating (14) is fixed on above indirect sensing arm (13) by low temperature glass solder.
The material that the Material selec-tion of direct pick-up arm (11), rhombus matrix (12) and indirect sensing arm (13) is consistent with high temperature pressure pipeline, avoid the thermal stress of different materials when temperature variation caused by thermal expansion coefficient difference, to ensure the monitoring accuracy of sensor.
Rhombus matrix (12) angle in direct pick-up arm direction is less than 90 °, and according to structural mechanics correlation theory, when pipeline strain is constant, in rhombus, angle is less, and strain amplification coefficient is higher.In the present invention, in rhombus, angle is 60 °, can carry out adjusting to obtain optimum efficiency according to the concrete size of high temperature pressure pipeline in reality.
By using the bonding high-temperature resistant optical fiber Bragg grating (14) of low temperature glass solder and indirect sensing arm (13), under can be implemented in high temperature 300 DEG C of environment, monitor the object of component surface strain.
Below in conjunction with accompanying drawing, example of the present invention is further elaborated:
1. the making of fiber-optic grating sensor
As shown in Figure 2, a pair pulley (21) and hoistable platform (23) are fixed on above operating platform (24), metallic base structure is placed on above hoistable platform (23), ensures that metallic base structure is firm, horizontal positioned;
High-temperature resistant optical fiber Bragg grating (22) frame is contained between two fixing pulleys (21), and grid region part is just positioned at rhombus matrix (12) inside, one end fixture (26) of grating is fixed on operating platform (24) side, the other end hangs the weight (25) of suitable weight, to ensure that high-temperature resistant optical fiber Bragg grating (22) is in horizontal tension;
With the vertical position of hoistable platform (23) adjustment metallic base structure, ensure that two ends, grid region are in the olive groove of rhombus matrix (12);
Put into appropriate low temperature glass solder, then sinter;
Silica gel is smeared equably at the joint of high-temperature resistant optical fiber Bragg grating and rhombus matrix, to eliminate the stress concentration phenomenon between high-temperature resistant optical fiber Bragg grating and low temperature glass solder, avoid grating stress concentrate and rupture, then treat that silica gel solidifies completely;
The centre wavelength of the high temperature resistant bragg grating of whole manufacturing process palpus spectrometer (27) Real-Time Monitoring, to adjust in time when having abnormal occurrence.
2. fiber-optic grating sensor is fixing
Pre-service before welding pipeline, removes the surface attachments of high temperature pressure pipeline, makes pipeline expose smooth finish surface;
Direct pick-up arm (11) two ends of fiber-optic grating sensor are welded on pipe surface, for each measuring point during welding, axis and hoop is taked to weld the method for a sensor respectively, hoop and the axial strain change on high temperature pressure pipeline surface can be monitored simultaneously, to provide comprehensive, reliable strain information, as shown in Figure 3;
Use high temperature adhesive plaster by sensor covering protection after welding, avoid extraneous physical damnification.
3. on-line monitoring
The fiber-optic grating sensor being welded in high temperature pressure pipeline surface is connected with optical cable, utilizes sensor multiplexing technology to form sensing network, cover the high temperature pressure pipeline needing monitoring.By signal receiving module, the sensor reflection wavelength signal carrying high temperature pressure pipeline strain information is analyzed, the strain abnormality point of high-temperature pipe can be found in advance, remind enterprise repair in time or change high temperature pressure pipeline, thus avoid the generation of high temperature pressure pipeline leakage or pipe explosion accident.
Claims (5)
1. the fiber-optic grating sensor of a high temperature pressure pipeline outer wall strain on-line monitoring, it is characterized in that, described fiber-optic grating sensor comprises direct pick-up arm, rhombus matrix, indirect sensing arm and high-temperature resistant optical fiber Bragg grating, and high-temperature resistant optical fiber Bragg grating is fixed in the olive groove of indirect sensing arm by low temperature glass solder.
2. the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring according to claim 1, it is characterized in that, the metallic base structure that described direct pick-up arm, rhombus matrix and indirect sensing arm are integrated, its material selects the material consistent with high temperature pressure pipeline as far as possible.
3. the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring according to claim 1, it is characterized in that, described rhombus matrix, in the rhombus in its direct pick-up arm direction, angle is less than 90 °, to play the effect of strain sensitization.
4. the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring according to claim 1, it is characterized in that, in described indirect sensing arm, the position of bonding fiber grating is olive shape.
5. the fiber-optic grating sensor of a kind of high temperature pressure pipeline outer wall strain on-line monitoring according to claim 1, it is characterized in that, the fusing point of described low temperature glass solder is 350 DEG C ~ 400 DEG C.
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| CN201410014287.3A CN104776808A (en) | 2014-01-10 | 2014-01-10 | Fiber grating sensor for monitoring the strain of the outer wall of high-temperature pressure pipeline online |
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| CN201410014287.3A CN104776808A (en) | 2014-01-10 | 2014-01-10 | Fiber grating sensor for monitoring the strain of the outer wall of high-temperature pressure pipeline online |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764418A (en) * | 2016-11-24 | 2017-05-31 | 洛阳双瑞风电叶片有限公司 | A kind of composite high-pressure hydrogen storage cylinder stress overload monitor system |
| CN106767486A (en) * | 2017-02-28 | 2017-05-31 | 武汉理工大学 | A kind of fiber grating two-dimensional strain sensitization sensor and its method for packing |
| CN107367240A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of square structure fiber grating reversing differential strain detection sensor part |
| CN107367239A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of loop configuration high-temperature pipe outer wall strain detecting fiber-optic grating sensor part |
| CN107884114A (en) * | 2017-11-07 | 2018-04-06 | 中国石油大学(华东) | Non-invasive pipeline pressure testing agency based on fiber grating |
| CN108663111A (en) * | 2018-04-28 | 2018-10-16 | 武汉理工大学 | The optical fibre grating acceleration sensor and measurement method of diaphragm and diamond structure |
| CN109900218A (en) * | 2019-04-08 | 2019-06-18 | 四川拜安科技有限公司 | It is a kind of to monitor the fiber grating load transducer with temperature-compensating for fan blade |
| CN112344870A (en) * | 2020-11-02 | 2021-02-09 | 武汉理工大学 | High-temperature-resistant FBG strain sensor with temperature compensation and packaging method thereof |
| CN112945438A (en) * | 2021-03-16 | 2021-06-11 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type soil pressure sensor |
| CN114985228A (en) * | 2022-05-10 | 2022-09-02 | 武汉理工大学 | Gluing process for improving high-temperature resistance of sensor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107367240A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of square structure fiber grating reversing differential strain detection sensor part |
| CN107367239A (en) * | 2016-05-12 | 2017-11-21 | 中国计量大学 | A kind of loop configuration high-temperature pipe outer wall strain detecting fiber-optic grating sensor part |
| CN107367240B (en) * | 2016-05-12 | 2019-12-13 | 中国计量大学 | Square structure fiber grating reverse differential strain detection sensing device |
| CN106764418A (en) * | 2016-11-24 | 2017-05-31 | 洛阳双瑞风电叶片有限公司 | A kind of composite high-pressure hydrogen storage cylinder stress overload monitor system |
| CN106767486A (en) * | 2017-02-28 | 2017-05-31 | 武汉理工大学 | A kind of fiber grating two-dimensional strain sensitization sensor and its method for packing |
| CN107884114B (en) * | 2017-11-07 | 2020-08-28 | 中国石油大学(华东) | Non-invasive pipeline pressure detection mechanism based on fiber bragg grating |
| CN107884114A (en) * | 2017-11-07 | 2018-04-06 | 中国石油大学(华东) | Non-invasive pipeline pressure testing agency based on fiber grating |
| CN108663111A (en) * | 2018-04-28 | 2018-10-16 | 武汉理工大学 | The optical fibre grating acceleration sensor and measurement method of diaphragm and diamond structure |
| CN109900218A (en) * | 2019-04-08 | 2019-06-18 | 四川拜安科技有限公司 | It is a kind of to monitor the fiber grating load transducer with temperature-compensating for fan blade |
| CN112344870A (en) * | 2020-11-02 | 2021-02-09 | 武汉理工大学 | High-temperature-resistant FBG strain sensor with temperature compensation and packaging method thereof |
| CN112945438A (en) * | 2021-03-16 | 2021-06-11 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type soil pressure sensor |
| CN112945438B (en) * | 2021-03-16 | 2023-08-22 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type soil pressure sensor |
| CN114985228A (en) * | 2022-05-10 | 2022-09-02 | 武汉理工大学 | Gluing process for improving high-temperature resistance of sensor |
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