CN101660898A - Fiber grating pavement strain transducer - Google Patents
Fiber grating pavement strain transducer Download PDFInfo
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- CN101660898A CN101660898A CN200910153156A CN200910153156A CN101660898A CN 101660898 A CN101660898 A CN 101660898A CN 200910153156 A CN200910153156 A CN 200910153156A CN 200910153156 A CN200910153156 A CN 200910153156A CN 101660898 A CN101660898 A CN 101660898A
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- fiber grating
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- pedestal
- putting groove
- strain transducer
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Abstract
The invention discloses a fiber grating pavement strain transducer which comprises a base and a probe. The top part of the base is provided with a guide groove used for limiting the probe; a first placement groove communicated with the guide groove is arranged in the base; the lower part of the probe is arranged in the guide groove and mutually matched with the guide groove; the bottom part of theprobe is provided with a second placement groove the position of which corresponds to the first placement groove; a sensitive element is arranged in the second placement groove; the upper part of thesensitive element is positioned in the second placement groove; the lower part of the sensitive element stretches into the first placement groove; the transducer is buried in the pavement, when the pavement is deformed, the probe senses the deformation of the pavement by the load effect, thereby leading the probe to drive the fiber grating of a sensing element to deform cooperatively; the fiber grating shares the deformation of the pavement; then the relation between the central wavelength of the fiber grating and the strain can be obtained by explaining the coupling effect through a mathematical method, thereby achieving monitoring on the pavement deformation; moreover, the measuring precision is higher. The fiber grating pavement strain transducer is suitable for monitoring the long-term deformation of asphalt pavements.
Description
Technical field
The present invention relates to a kind of strain transducer, especially relate to a kind of fiber grating pavement strain transducer.
Background technology
Fatigue is one of Pavement Design standard, and the fatigue failure of bituminous concrete is relevant with the size of stretching strain value at the bottom of the brea bed.The design, construction and the maintenance that accurately record the strain-responsive road pavement at the bottom of brea bed under the actual vehicle load action have important meaning.
Usually traditional electric signal sensor is adopted in the strain measurement of concrete road surface, but the concrete pavement construction inclement condition, have high temperature, high pressure and roll, unfavorable factor such as distortion, easily cause traditional electric signal sensor survival rate very low; Owing to the external electromagnetic interference of noise, the measurement result of traditional electric signal sensor very easily is subjected to the influence of these interference simultaneously, therefore is not suitable for engineering site and uses; In addition, the moisture resistance of traditional electric signal sensor, resistance to corrosion a little less than, very easily influence the strain measurement result of concrete road surface.
Summary of the invention
Technical matters to be solved by this invention provides a kind of simple in structure, has moisture resistance, resistance to corrosion well, and strain measurement precision height is fit to the fiber grating pavement strain transducer that the bituminous pavement TERM DEFORMATION is monitored.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of fiber grating pavement strain transducer, comprise pedestal and probe, the top of described pedestal is provided with and is used for described probe is carried out spacing gathering sill, be provided with first putting groove that is connected with described gathering sill in the described pedestal, the bottom of described probe is placed in the described gathering sill and cooperatively interacts with described gathering sill, the bottom of described probe is provided with and corresponding second putting groove in the described first putting groove position, be provided with sensitive element in described second putting groove, the top of described sensitive element is positioned at described second putting groove, and the bottom of described sensitive element is stretched in described first putting groove.
Described sensitive element comprises the tamper seal encapsulation and is arranged at the interior fiber grating of described tamper seal encapsulation.
Described protection packaging cover is provided with first fixed part and second fixed part, and described first fixed position is connected with described pedestal in described first putting groove, and described second fixed part is connected with described second putting groove.
The bottom of described pedestal is provided with fairlead, and the end of described fiber grating is connected with tail optical fiber, and an end of described tail optical fiber extend out to outside the described pedestal by described fairlead, and described tail optical fiber is externally connected with Transmission Fibers.
Be provided with the filling slot that is connected with described first putting groove and described fairlead respectively in the described pedestal, the bottom of described tamper seal encapsulation is stretched in the described filling slot by described first putting groove, one end of described Transmission Fibers is positioned at described filling slot, is filled with the protection filling material in the described filling slot; At this, the protection filling material can adopt the ripe arbitrarily resistant to elevated temperatures filling material of existing resistant to elevated temperatures glass cement or other.
Described Transmission Fibers is disposed with armouring wire and fiber optic protection layer outward, and described fiber optic protection layer adopts etch-proof material to make.
Described probe is column, and the outer wall of described probe is provided with at least one corner angle, and the top of described pedestal is provided with the corner angle groove that is connected and is used for matching with described corner angle with described gathering sill.
Described probe is a triangular prism, or is quadrangular, or is other polygon prisms.
The bottom of described pedestal is provided with at least one mounting hole, be connected with auxiliary positioning and dismountable support bar when being used for the sensor installation in the described mounting hole, described support bar comprises support portion and connecting portion, and described connecting portion stretches in the described mounting hole and cooperatively interacts with described mounting hole.
Described pedestal is coated with the atom ash outward and forms the atom grieshoch, and described atom grieshoch is coated with good the spraying paint certainly of decay resistance outward and forms from layer of paint; Smearing atom ash and spraying mainly is in order to protect pedestal not to be corroded because of the external environment factor from spraying paint; therefore in fact pedestal also can directly adopt the good and metal material that have an anti-corrosion capability of endurance quality to make; as adopt stainless steel material, outside pedestal, just need not to smear again atom ash and spraying like this from having sprayed paint.
Compared with prior art, the invention has the advantages that and utilize the sensitive element include fiber grating to carry out strain measurement, fiber grating is a kind of strain sensor of function admirable, and its moisture resistance, resistance to corrosion are strong, antijamming capability is strong, be not subjected to the interference of electromagnetic field, also do not influence external electromagnetic field, electrical insulation capability is good, good endurance, measure highly sensitive, measuring accuracy is high, can conveniently change range, can form distributed measurement; When using this sensor, this sensor is embedded in the road surface, when road surface (testee) when deforming, probe is subjected to the distortion that road surface (testee) experienced in loading, thereby make probe drive sensing element fiber grating cooperative transformation, fiber grating is shared the distortion of road surface (testee), explain that by mathematical method this coupling obtains the relation of fiber grating centre wavelength and strain again, thereby realize the monitoring of road pavement distortion, and the strain measurement precision is higher, be fit to the monitoring of bituminous pavement TERM DEFORMATION, can effectively assess the load and the distortion situation on road surface by utilizing monitoring result.Being provided with of probe mainly is in order to increase the measurement sensitivity of fiber grating, when using this sensor, directly experienced the distortion of road surface (testee) by probe; The probe that is bonded with sensitive element is placed in the gathering sill, guaranteed that not only fiber grating is only stressed vertically, promptly only on direction of measurement, deform, and avoided the bending of fiber grating and reversed, effectively guaranteed the accuracy of strain measurement, gathering sill has played position-limiting action to probe simultaneously, has prevented that effectively this sensor is subjected to impact failure.By the support bar of installing on the spacing and pedestal of gathering sill to probe, can be under the not affected prerequisite of the sensing characteristics of guaranteeing this sensor, improve installation reliability, avoid twisting and rolling the influence of this sensor being carried out strain measurement, effectively guarantee the strain measurement precision, guaranteed the survival rate of this sensor under abominable execution conditions simultaneously.Pedestal, probe and support bar all adopt metal material such as the stainless steel material that endurance quality is good and anti-corrosion capability is strong to make, or when they adopt the common metal material to make, smear atom ash and spraying outside again from spraying paint, can effectively improve the resistance to corrosion of this sensor like this, the operate as normal that has guaranteed this sensor is unaffected, has prolonged the serviceable life of this sensor simultaneously.The gap between gathering sill and probe and the gap of fairlead and fiber optic protection layer all are filled with resistant to elevated temperatures flexible glue such as glass cement, can effectively prevent pitch infiltration sensor internal and influence the performance of this sensor.In addition, the present invention is simple in structure, cost is low, is not subjected to the interference of electromagnetic field; under the prerequisite of effectively having protected fiber grating; can realize well the strain of bituminous pavement is monitored, be suitable for engineering site and use, and can design different ranges and different accuracy according to requirement of engineering.
Description of drawings
Fig. 1 is a cross-sectional schematic of the present invention;
Fig. 2 is a schematic top plan view of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Optical fiber sensing technology has obtained significant progress in recent years, and it is the desirable sensing element that is applicable to long term monitoring, is particularly useful for civil engineering structure.Sensor based on fiber grating is the functional sensor that fiber grating is made sensing element, has the unrivaled advantage of other types Fibre Optical Sensor, mainly contain: simple in structure, can be according to the shape that is changed sensor by the profile of geodesic structure, when satisfying actual measurement to the large volume requirement of sensor; By changing the physical parameter of structure, can change range easily; Good reliability, strong interference immunity, and easily constitute sensing network etc.At present, fiber-optic grating sensor has been widely used in fields such as civil engineering work, Aero-Space, petrochemical complex, medical science, environmental engineering.Therefore; the present invention proposes a kind of novel optical fiber and optical grating pavement strain transducer; as shown in the figure; this sensor comprises pedestal 1 and the probe of being made by metal material 2; the top of pedestal 1 is provided with and is used for 2 carrying out spacing gathering sill 11 to popping one's head in; be provided with first putting groove 12 that is connected with gathering sill 11 in the pedestal 1; the filling slot 14 that the bottom of pedestal 1 is provided with fairlead 13 and is connected with first putting groove 12 and fairlead 13 respectively; the bottom of probe 2 is placed in the gathering sill 11 and cooperatively interacts with gathering sill 11; gathering sill 11 is used to limit the range of this sensor and plays protection probe 2 and 2 carry out spacing effect to popping one's head in; the bottom of probe 2 is provided with and corresponding second putting groove 21 in first putting groove, 12 positions; be provided with sensitive element 22 in second putting groove 21; the top of sensitive element 22 is positioned at second putting groove 21, and the bottom of sensitive element 22 is stretched in first putting groove 12.
In this specific embodiment, sensitive element 22 comprises tamper seal encapsulation 23 and the sensing element fiber grating 24 that is embedded in the tamper seal encapsulation 23, being provided with of tamper seal encapsulation 23 mainly is in order to protect fragile fiber grating 24, to prevent that this sensor fiber grating 24 when work from rupturing because of applied external force; First fixed part 231 and second fixed part 232 have been wholely set on the tamper seal encapsulation 23, first fixed part 231 is positioned at first putting groove 12 and is connected with pedestal 1, second fixed part 232 is generally positioned at the top of tamper seal encapsulation 23 and is connected with second putting groove 21 of the bottom that is arranged at probe 2, like this by the 2 measurement sensitivity that increased fiber grating 24 of popping one's head in, when using this sensor, directly experience the distortion on road surface by probe 2; The end of fiber grating 24 is connected with tail optical fiber 25, one end of tail optical fiber 25 extend out to outside the pedestal 1 by fairlead 13, tail optical fiber 25 is externally connected with Transmission Fibers 3, Transmission Fibers 3 outer armouring wire 31 and the fiber optic protection layers 32 of being disposed with, fiber optic protection layer 32 adopts etch-proof material to make, as PVE (polyvinyl ethyl ether) material, because fiber grating 24 can not bear shear stress, and civil engineering work is extensive construction, protection to tail optical fiber 25 is necessary, in the present embodiment by one deck armouring wire 31 is set outside Transmission Fibers 3, reach the purpose of protection tail optical fiber 25 and Transmission Fibers 3, when laying this sensor, a guard box (not shown) can be set on transmission line, the Transmission Fibers 3 that is provided with armouring wire 31 is placed in the guard box, can effectively prevent the damage of Transmission Fibers 3 and the tail optical fiber 25 of drawing like this; The bottom that is arranged at the tamper seal encapsulation 23 outside the fiber grating 24 is stretched in the filling slot 14 by first putting groove 12, and an end that is arranged at the Transmission Fibers 3 outside the tail optical fiber 25 is positioned at filling slot 14, is filled with protection filling material 15 in the filling slot 14.
In this specific embodiment, tamper seal encapsulation 23 is made by FRP (Fiber Reinforcing Package, fiber reinforcement encapsulation) material; Utilize existing resistant to elevated temperatures glass cement that first fixed part 231 is carried out bonding the connection with pedestal 1, utilize existing resistant to elevated temperatures glass cement that second fixed part 232 is carried out bonding the connection with the bottom land of second putting groove 21 equally; Protection filling material 15 can adopt the ripe arbitrarily resistant to elevated temperatures filling material of existing resistant to elevated temperatures glass cement or other.
In this specific embodiment, probe 2 can adopt ordinary metallic material to make, also can adopt the good and metal material that have an anti-corrosion capability of endurance quality to make, probe 2 is cylindric, the outer wall of probe 2 is provided with two corner angle 26, the top of pedestal 1 is provided with the bottom that 17, two corner angle 26 of corner angle groove that are connected and are used for matching with corner angle 26 with gathering sill 11 can only be arranged on probe 2, promptly is positioned at that position of gathering sill 11; Probe 2 also can adopt other structures, as it is designed to triangular prism, or quadrangular, or other polygon prisms are as long as guaranteeing to pop one's head in 2 can only be removable in vertical direction, promptly guarantee to pop one's head in and 2 have only one degree of freedom, the probe 2 that will be bonded with sensitive element 22 like this is placed in the gathering sill 11, has guaranteed that not only 24 of fiber gratings are stressed vertically, promptly only deforms on direction of measurement, and avoided the bending of fiber grating 24 and reverse, effectively guaranteed the accuracy of strain measurement.
In this specific embodiment, the outer wall of the bottom of pedestal 1 is provided with three mounting holes 16, all be connected with auxiliary positioning and dismountable support bar 4 when being used for the sensor installation in each mounting hole 16, support bar 4 can adopt ordinary metallic material to make, also can adopt the good and metal material that have an anti-corrosion capability of endurance quality to make, support bar 4 comprises support portion 41 and connecting portion 42, connecting portion 42 stretches in the mounting hole 16 and cooperatively interacts with mounting hole 16, can adopt thread connecting mode, as on connecting portion 42, external thread being set, on mounting hole 16, internal thread is set, also can adopts other existing connected modes.
In this specific embodiment, when pedestal 1, probe 2 and support bar 4 adopt the common metal material to make, need outside pedestal 1, to be coated with atom ash (not shown) and form atom grieshoch (not shown), the atom grieshoch is coated with the good (not shown) of spraying paint certainly of decay resistance outward and forms from the layer of paint (not shown), the atom grieshoch is set and is in order to prevent that corrosive mediums such as rainwater from directly corroding pedestal 1 and other metal part positions, with permanance and the practicality that improves this sensor from the fundamental purpose of layer of paint; In real process, be to locate to smear the atom ash in the slit of each building block, utilize floating each position, slit of atom ash, spray with spraying paint certainly again after the strickling polishing is good.When directly adopting the good and metal material that have an anti-corrosion capability of endurance quality, makes pedestal 1, as adopt stainless steel material, outside pedestal 1, just need not to smear again atom ash and spraying like this from having sprayed paint, therefore, probe 2 and support bar 4 also can directly adopt stainless steel material to make, and so also can smear the atom ash.
In this specific embodiment, the gap between gathering sill 11 and the probe 2 is filled with existing resistant to elevated temperatures flexible glue, as resistant to elevated temperatures glass cement; Probe 2 can change according to different ranges with gathering sill 11 gap in vertical direction; Fairlead 13 is filled with existing resistant to elevated temperatures glass cement with the gap of fiber optic protection layer 32.
When sensor of the present invention is installed; earlier fiber grating 24 is buried underground in the tamper seal encapsulation 23; constitute sensitive element 22 by fiber grating 24 and tamper seal encapsulation 23; second fixed part 232 that utilizes existing resistant to elevated temperatures glass cement will be arranged on the tamper seal encapsulation 23 carries out bonding the connection with the bottom land of second putting groove 21 of the bottom that is arranged at probe 2; the probe 2 that is connected with sensitive element 22 is installed in the gathering sill 11 of pedestal 1; first fixed part 231 stretches in first putting groove 12 with the bottom of tamper seal encapsulation 23; utilize resistant to elevated temperatures glass cement that first fixed part 231 is carried out strong bond with pedestal 1; resistant to elevated temperatures flexible glue such as glass cement are filled in gap between gathering sill 11 and probe 2 again; the tail optical fiber 25 that is connected the end of fiber grating 24 penetrates in the Transmission Fibers 3 that is provided with armouring wire 31; be connected with pedestal 1 being arranged at armouring wire 31 outer fiber optic protection layers 32; to protect filling material 15 to pour in the filling slot 14 of pedestal 1 again; under the temperature that adapts to, dry processing; support bar 4 is installed in the mounting hole 16; outside whole sensor, smear the atom ash at last and form one deck atom grieshoch, outside the atom grieshoch, spray good the spraying paint certainly of decay resistance again.After the installation, determine the range and the precision of good this sensor.
Claims (10)
1, a kind of fiber grating pavement strain transducer, it is characterized in that comprising pedestal and probe, the top of described pedestal is provided with and is used for described probe is carried out spacing gathering sill, be provided with first putting groove that is connected with described gathering sill in the described pedestal, the bottom of described probe is placed in the described gathering sill and cooperatively interacts with described gathering sill, the bottom of described probe is provided with and corresponding second putting groove in the described first putting groove position, be provided with sensitive element in described second putting groove, the top of described sensitive element is positioned at described second putting groove, and the bottom of described sensitive element is stretched in described first putting groove.
2, a kind of fiber grating pavement strain transducer according to claim 1 is characterized in that described sensitive element comprises the tamper seal encapsulation and is arranged at the interior fiber grating of described tamper seal encapsulation.
3, a kind of fiber grating pavement strain transducer according to claim 2; it is characterized in that described protection packaging cover is provided with first fixed part and second fixed part; described first fixed position is connected with described pedestal in described first putting groove, and described second fixed part is connected with described second putting groove.
4, according to claim 2 or 3 described a kind of fiber grating pavement strain transducers, the bottom that it is characterized in that described pedestal is provided with fairlead, the end of described fiber grating is connected with tail optical fiber, one end of described tail optical fiber extend out to outside the described pedestal by described fairlead, and described tail optical fiber is externally connected with Transmission Fibers.
5, a kind of fiber grating pavement strain transducer according to claim 4; it is characterized in that being provided with in the described pedestal filling slot that is connected with described first putting groove and described fairlead respectively; the bottom of described tamper seal encapsulation is stretched in the described filling slot by described first putting groove; one end of described Transmission Fibers is positioned at described filling slot, is filled with the protection filling material in the described filling slot.
6, a kind of fiber grating pavement strain transducer according to claim 5 is characterized in that described Transmission Fibers is disposed with armouring wire and fiber optic protection layer outward, and described fiber optic protection layer adopts etch-proof material to make.
7, a kind of fiber grating pavement strain transducer according to claim 6, it is characterized in that described probe is column, the outer wall of described probe is provided with at least one corner angle, and the top of described pedestal is provided with the corner angle groove that is connected and is used for matching with described corner angle with described gathering sill.
8, a kind of fiber grating pavement strain transducer according to claim 6 is characterized in that described probe is a triangular prism, or is quadrangular, or is other polygon prisms.
9, according to each described a kind of fiber grating pavement strain transducer in the claim 1 to 3, the bottom that it is characterized in that described pedestal is provided with at least one mounting hole, be connected with auxiliary positioning and dismountable support bar when being used for the sensor installation in the described mounting hole, described support bar comprises support portion and connecting portion, and described connecting portion stretches in the described mounting hole and cooperatively interacts with described mounting hole.
10, a kind of fiber grating pavement strain transducer according to claim 9 is characterized in that described pedestal is coated with the atom ash outward and forms the atom grieshoch, and described atom grieshoch is coated with good the spraying paint certainly of decay resistance outward and forms from layer of paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101531562A CN101660898B (en) | 2009-09-24 | 2009-09-24 | Fiber grating pavement strain transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101531562A CN101660898B (en) | 2009-09-24 | 2009-09-24 | Fiber grating pavement strain transducer |
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| CN101660898A true CN101660898A (en) | 2010-03-03 |
| CN101660898B CN101660898B (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101531562A Expired - Fee Related CN101660898B (en) | 2009-09-24 | 2009-09-24 | Fiber grating pavement strain transducer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095363A (en) * | 2010-12-08 | 2011-06-15 | 长安大学 | Multidimensional sensor for detecting dynamic response of bituminous pavement |
| CN102221346A (en) * | 2011-03-10 | 2011-10-19 | 大连理工大学 | Full-scale optic fiber sensing technology for monitoring road structural form |
| CN102445293A (en) * | 2011-10-28 | 2012-05-09 | 西安欣源测控技术有限公司 | Infill stress sensor |
| CN102628673A (en) * | 2012-03-30 | 2012-08-08 | 大连理工大学 | Armor optical fiber sensor suitable for road structure full size monitoring |
| CN103061315A (en) * | 2013-01-11 | 2013-04-24 | 河海大学 | Monitoring instrument embedding protective device |
| CN106592375A (en) * | 2016-10-27 | 2017-04-26 | 上海市政工程设计研究总院（集团）有限公司 | Anti-cracking method based on optical fiber sensing technology |
| CN109186826A (en) * | 2018-09-10 | 2019-01-11 | 中国民航大学 | A kind of board bottom flexural tensile stress monitoring system and method for existing road face structure |
-
2009
- 2009-09-24 CN CN2009101531562A patent/CN101660898B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095363A (en) * | 2010-12-08 | 2011-06-15 | 长安大学 | Multidimensional sensor for detecting dynamic response of bituminous pavement |
| CN102095363B (en) * | 2010-12-08 | 2012-05-23 | 长安大学 | Multidimensional sensor for detecting dynamic response of bituminous pavement |
| CN102221346A (en) * | 2011-03-10 | 2011-10-19 | 大连理工大学 | Full-scale optic fiber sensing technology for monitoring road structural form |
| CN102221346B (en) * | 2011-03-10 | 2013-07-10 | 大连理工大学 | Full-scale optic fiber sensing technology for monitoring road structural form |
| CN102445293A (en) * | 2011-10-28 | 2012-05-09 | 西安欣源测控技术有限公司 | Infill stress sensor |
| CN102628673A (en) * | 2012-03-30 | 2012-08-08 | 大连理工大学 | Armor optical fiber sensor suitable for road structure full size monitoring |
| CN103061315A (en) * | 2013-01-11 | 2013-04-24 | 河海大学 | Monitoring instrument embedding protective device |
| CN103061315B (en) * | 2013-01-11 | 2014-07-09 | 河海大学 | Monitoring instrument embedding protective device |
| CN106592375A (en) * | 2016-10-27 | 2017-04-26 | 上海市政工程设计研究总院（集团）有限公司 | Anti-cracking method based on optical fiber sensing technology |
| CN109186826A (en) * | 2018-09-10 | 2019-01-11 | 中国民航大学 | A kind of board bottom flexural tensile stress monitoring system and method for existing road face structure |
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| Publication number | Publication date |
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| CN101660898B (en) | 2011-05-11 |
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Address after: 315176 Zhejiang city of Ningbo Province Wang Shanshan Lu Chun Industrial Park No. 1 Patentee after: Ningbo fir intelligent safety Polytron Technologies Inc Patentee after: Jiangsu Traffic Research Institute Address before: 315176 Zhejiang city of Ningbo Province Wang Shanshan Lu Chun Industrial Park No. 1 Patentee before: Shangong Structure Monitor & Control Engineering Center Co., Ltd., Ningbo Patentee before: Jiangsu Traffic Research Institute |
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