CN104279974A - Split type optic fiber strain sensor assembly - Google Patents
Split type optic fiber strain sensor assembly Download PDFInfo
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- CN104279974A CN104279974A CN201410507438.9A CN201410507438A CN104279974A CN 104279974 A CN104279974 A CN 104279974A CN 201410507438 A CN201410507438 A CN 201410507438A CN 104279974 A CN104279974 A CN 104279974A
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- metal tube
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- protector
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Abstract
The invention provides a split type optic fiber strain sensor assembly. Under the premise that fiber bragg grating prestressed encapsulation is not influenced, an encapsulation mode and an assembling mode are decoupled, and the problem that a sensor cannot be used again after being mounted once is solved through separation of a metal encapsulation protection piece and an assembling base. The split type optic fiber strain sensor assembly comprises a sensing element, the encapsulation protection piece and the assembling base. The sensing element is a fiber bragg grating, and the encapsulation protection piece is a metal tube. After the fiber bragg grating penetrates through the mental tube, the clearance between the fiber bragg grating and the metal tube is welded and fastened in an ultrasonic welding mode. Optical fibers are led out from the two ends of the metal tube. The two ends of the metal tube are banded tightly through flange plates. The metal tube with the encapsulated sensing element is supported by the assembling base, and the flange plates at the two ends of the metal tube are connected with the assembling base.
Description
Technical field
The present invention relates to a kind of sensor module, be specifically related to a kind of split type fibre optic strain sensor assembly, belong to fiber grating and measure field of sensing technologies.
Background technology
Highly sensitive, antijamming capability is strong, good environmental adaptability, volume are little because having for fiber grating, can long-distance transmissions, be easy to the advantages such as Distributed Multi networking measurement, be widely used in the sensing measurement fields such as vibration, displacement, acceleration, temperature, strain.In structural safety monitoring field, the safety of buildings is monitored and assessed to main use fiber Bragg grating strain sensor, as airport, gymnasium, bridge, tunnel etc., measure the change of the mechanics parameters such as its displacement, strain, vibration, then regularly save historical data, set measuring point alarm threshold value etc.Its ultimate principle utilizes Fiber Bragg Grating FBG, allows ultraviolet light be irradiated on bare fibre by mask grating, cause the permanent change of bare fibre fiber core refractive index, forms Bragg grating; When being subject to ess-strain change, the pitch of grating changes simultaneously, thus accurately monitor strain.
Because naked fiber grating diameter only has 125 μm, easily damage in severe structural safety monitoring engineering-environment, only have encapsulation and the trim designs of it being carried out to protectiveness, the performance that fiber grating is more stable could be given, guarantee that it is reliable and practical.Due to the difference of sensor application environment and condition, fiber Bragg grating strain sensor is all design concrete assembly structure and packaging technology according to specific mounting condition mostly, does not possess versatility.And large multisensor is all by its metal protection part and mounted base integration machine-shaping at present, make sensor not easily field-strip and replacing after each structure detection completes, cannot reuse after one-step installation, rapid deployment, reusable demand cannot be met, all uneconomical from financial cost and use and maintenance efficiency.
Summary of the invention
In view of this, the invention provides a kind of split type fibre optic strain sensor assembly, protector will be encapsulated and be separated with mounted base, thus the problem cannot again reused after solving sensor one-step installation, make fiber-optic grating sensor have stronger environmental suitability.
Described split type fibre optic strain sensor assembly comprises sensing element, encapsulation protector and mounted base; Described sensing element is fiber grating, and encapsulation protector is metal tube; Space between fiber grating and metal tube, through after metal tube, is welded fastening by the mode of ultrasonic soldering by described fiber grating; Optical fiber is drawn from metal tube two ends; The two ends of described metal tube are respectively by ring flange banding; The metal tube being packaged with sensing element is supported in described mounted base, and the ring flange at metal tube two ends is connected with mounted base.
As a kind of optimal way of the present invention, the inside surface of the outside surface of the optical fiber be positioned at outside metal tube and encapsulation protector is carried out gold-plated process.
As a kind of optimal way of the present invention, described mounted base comprises the supporting seat of two L shapes, and the two ends of encapsulation protector are supported on two supporting seats respectively; Encapsulation protector both sides ring flange respectively with two supporting seats adopt the mode be spirally connected to be connected.Beneficial effect:
(1) adopt split type assembly structure to fibre optic strain sensor, make encapsulation protector and the separable dismounting of mounted base of fiber grating, the installation being convenient to fibre optic strain sensor is laid and reuses.One-piece construction is simple and reliable, and maintenanceability is strong, has stronger environmental suitability.
(2) mounted base adopts integrated mode processing and fabricating, ensures its structural strength, impact and withstand voltage properties.
(3) encapsulate between the ring flange of protector both sides and mounted base and fix by the mode be spirally connected, ensure that fiber grating is prestressed stable, effectively can improve the measuring accuracy of sensor.
(4) the fiber section skin through optical fiber Bragg grating encapsulation protector is gold-plated, and encapsulation protector superficies also carry out gold-plated, can effectively prevent marine corrosion and salt fog to the erosion of optical fiber and destruction.
Accompanying drawing explanation
Fig. 1 is metal protection part encapsulation schematic diagram;
Fig. 2 is the one-piece construction schematic diagram of this sensor module.
Wherein: 1-sensing element, 2-grating, 3-encapsulate protector, 4-supporting seat
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The present embodiment provides a kind of split type fibre optic strain sensor assembly applying to structural safety monitoring, the encapsulation protector of this sensor module and the separable dismounting of mounted base, thus the installation being convenient to fiber-optic grating sensor is laid and reuses.
This split type fibre optic strain sensor assembly comprises sensing element 2, encapsulation protector 3 and mounted base.Wherein sensing element 2 for wavelength be λ
boptical fiber Bragg raster, encapsulation protector 3 be steel pipe.This steel pipe adopts time processing shaping, only stays a small axial air gap that fiber grating can be passed, and to ensure its structural strength, makes it possess impact and withstand voltage properties simultaneously.Through after capillary tubing inwall, there is slight void in fiber grating, weld fastening by the mode of ultrasonic soldering by this slight void between fiber grating and steel pipe inner wall, makes the fiber grating after encapsulating keep tensioning state, as described in Figure 1.Optical fiber 1 is drawn from the aperture at steel pipe two ends, for preventing extraneous corrosion and salt fog to the erosion damage of optical fiber, by gold-plated for the exposed outside surface at steel pipe infrared optical fiber 1, also carries out gold-plated at steel pipe internal-surface simultaneously.In addition, ring flange banding is used at steel pipe two ends respectively, and is shut in conduit gap by laser bonding, so that the butt-joint locking of steel pipe and mounted base.
When steel pipe tension or pressurized, optical fiber Bragg raster will thereupon in longitudinal stretching or compression.Strain in optical fiber causes the photoelastic effect of grating space and refractive index, when the longitudinal strain of optical fiber is ε
ftime, the wavelength shift Δ λ of Bragg grating
bfor:
Δλ
B＝λ
B(1-β)ε
f
Wherein β is effective photoelastic constant of optical fiber.
The strain of this some place structure can be learnt by the change of measuring optical fiber optical grating reflection wavelength.But be the strain of accurate monitoring of structures, first clear and definite Bragg grating institute must survey strain and the relation of structure logarithmic strain, namely should consider the strain transfer problem after optical fiber Bragg grating encapsulation being entered metal steel pipe.
In the present embodiment, fiber grating is directly pasted onto steel pipe inner wall by ultra-sonic welded, middle layer is there is like this between fiber grating and steel pipe inner wall, the strain that fiber grating is experienced is the strain of weld layer inside surface, different from steel pipe inner wall actual strain.Due to optical fiber and steel pipe inner wall paste after define strain gradient, the wavelength shift Δ λ of Bragg grating
bwith steel pipe strain stress
cbetween relation can be expressed as:
Δλ
B＝μλ
B(1-β)ε
c
Wherein μ is the sticky glutinous coefficient between optical fiber and steel pipe, has ε
f=μ ε
c.
So:
The strain experienced of fiber grating and the actual strain of encapsulation protector are stable linear relationships as can be seen here, just can monitoring of structures strain accurately according to this linear relationship.
Mounted base comprises the supporting seat 4 of two L shapes, as shown in Figure 2.The vertical plane of supporting seat 4 is processed with the otch for placing steel tubes.The two ends of steel pipe are supported on respectively on two supporting seats, the ring flange at steel pipe two ends and fixing by the mode be spirally connected of supporting seat, be convenient to dismounting and change on the one hand and reuse, also can ensure that fiber grating is prestressed stable on the other hand, make to keep one between fiber grating, steel pipe and mounted base and stablize good stressed relation.In the present embodiment by socket head cap screw by ring flange and supporting seat fastening, certain prestress is applied to fiber grating, by regulating the prestressed size of fiber grating applied, can make to keep one between fiber grating, encapsulation protector and mounted base and stablizing good stressed relation.When extraneous temperature variation, sensor has good stability and repeatability.
For fiber grating and the coupling part of available protecting sensor, argon arc welding mode is adopted mounted base spot welding to be fixed on installed surface, to ensure alap welding temperature and the least possible operation surface of contact.Relative position relation before fastening between adjustment optical fiber Bragg grating encapsulation metalwork, mounted base, is convenient to the spot weld operation space of mounted base.Parallel with mounted base to realize optical fiber Bragg grating encapsulation protector, deviation is not more than ± 1 ° (this requirement can adjust according to the actual requirements).
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a split type fibre optic strain sensor assembly, is characterized in that, comprises sensing element, encapsulation protector and mounted base; Described sensing element is fiber grating, and encapsulation protector is metal tube; Space between fiber grating and metal tube, through after metal tube, is welded fastening by the mode of ultrasonic soldering by described fiber grating; Optical fiber is drawn from metal tube two ends; The two ends of described metal tube are respectively by ring flange banding; The metal tube being packaged with sensing element is supported in described mounted base, and the ring flange at metal tube two ends is connected with mounted base.
2. a kind of split type fibre optic strain sensor assembly as claimed in claim 1, is characterized in that, the inside surface of the outside surface of the optical fiber be positioned at outside metal tube and encapsulation protector is carried out gold-plated process.
3. a kind of split type fibre optic strain sensor assembly as claimed in claim 1, it is characterized in that, described mounted base comprises the supporting seat of two L shapes, and the two ends of encapsulation protector are supported on two supporting seats respectively; Encapsulation protector both sides ring flange respectively with two supporting seats adopt the mode be spirally connected to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410507438.9A CN104279974A (en) | 2014-09-28 | 2014-09-28 | Split type optic fiber strain sensor assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410507438.9A CN104279974A (en) | 2014-09-28 | 2014-09-28 | Split type optic fiber strain sensor assembly |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289091A (en) * | 2016-10-21 | 2017-01-04 | 广东核电合营有限公司 | A kind of lightweight fiber grating wide range strain gauge being applicable to microcrack structure |
| CN106382894A (en) * | 2016-11-09 | 2017-02-08 | 哈尔滨工程大学 | Fiber grating multidirectional sensor |
| CN106871809A (en) * | 2017-03-28 | 2017-06-20 | 智性科技南通有限公司 | A kind of replaceable fatigue fiber Bragg grating strain sensor high |
| CN107101592A (en) * | 2017-06-21 | 2017-08-29 | 智性科技南通有限公司 | A kind of anti-buckling fiber Bragg grating strain sensor and preparation method thereof |
| CN108460201A (en) * | 2018-02-13 | 2018-08-28 | 中国船舶重工集团公司第七〇九研究所 | A kind of protection flange plate structure parameter extracting method |
| CN112268513A (en) * | 2020-10-15 | 2021-01-26 | 湖北三江航天红峰控制有限公司 | Insertion sheet type tunnel joint displacement sensor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648702A (en) * | 2004-12-17 | 2005-08-03 | 武汉理工大学 | Optical fiber sensitive element metallized packaging structure and its method |
| JP2005249861A (en) * | 2004-03-01 | 2005-09-15 | Shimizu Corp | Optical fiber sensor and optical fiber sensor module |
| KR20060025908A (en) * | 2004-09-18 | 2006-03-22 | 이금석 | Package for fiber bragg grating sensor |
| CN101162157A (en) * | 2007-11-14 | 2008-04-16 | 山东大学 | Surface mounting or welding type stress-strain test sensing unit |
| CN102297706A (en) * | 2011-05-24 | 2011-12-28 | 黄堃 | Fiber bragg grating sensor with metal packaging and manufacturing method thereof |
| CN103273183A (en) * | 2013-06-17 | 2013-09-04 | 南昌大学 | Capillary spot welding packaging process for applying prestressing force on fiber bragg grating |
| CN103791850A (en) * | 2014-02-11 | 2014-05-14 | 柳州欧维姆机械股份有限公司 | Temperature-self-compensating-integrated fiber bragg grating strain transducer and method for monitoring cable force of inhaul cable through integrated temperature self-compensating fiber bragg grating strain transducer |
| CN204228120U (en) * | 2014-09-28 | 2015-03-25 | 中国船舶重工集团公司第七一九研究所 | A kind of split type fibre optic strain sensor assembly |
-
2014
- 2014-09-28 CN CN201410507438.9A patent/CN104279974A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005249861A (en) * | 2004-03-01 | 2005-09-15 | Shimizu Corp | Optical fiber sensor and optical fiber sensor module |
| KR20060025908A (en) * | 2004-09-18 | 2006-03-22 | 이금석 | Package for fiber bragg grating sensor |
| CN1648702A (en) * | 2004-12-17 | 2005-08-03 | 武汉理工大学 | Optical fiber sensitive element metallized packaging structure and its method |
| CN101162157A (en) * | 2007-11-14 | 2008-04-16 | 山东大学 | Surface mounting or welding type stress-strain test sensing unit |
| CN102297706A (en) * | 2011-05-24 | 2011-12-28 | 黄堃 | Fiber bragg grating sensor with metal packaging and manufacturing method thereof |
| CN103273183A (en) * | 2013-06-17 | 2013-09-04 | 南昌大学 | Capillary spot welding packaging process for applying prestressing force on fiber bragg grating |
| CN103791850A (en) * | 2014-02-11 | 2014-05-14 | 柳州欧维姆机械股份有限公司 | Temperature-self-compensating-integrated fiber bragg grating strain transducer and method for monitoring cable force of inhaul cable through integrated temperature self-compensating fiber bragg grating strain transducer |
| CN204228120U (en) * | 2014-09-28 | 2015-03-25 | 中国船舶重工集团公司第七一九研究所 | A kind of split type fibre optic strain sensor assembly |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289091A (en) * | 2016-10-21 | 2017-01-04 | 广东核电合营有限公司 | A kind of lightweight fiber grating wide range strain gauge being applicable to microcrack structure |
| CN106382894A (en) * | 2016-11-09 | 2017-02-08 | 哈尔滨工程大学 | Fiber grating multidirectional sensor |
| CN106382894B (en) * | 2016-11-09 | 2018-12-25 | 哈尔滨工程大学 | A kind of fiber grating multidimensional sensor |
| CN106871809A (en) * | 2017-03-28 | 2017-06-20 | 智性科技南通有限公司 | A kind of replaceable fatigue fiber Bragg grating strain sensor high |
| CN107101592A (en) * | 2017-06-21 | 2017-08-29 | 智性科技南通有限公司 | A kind of anti-buckling fiber Bragg grating strain sensor and preparation method thereof |
| CN108460201A (en) * | 2018-02-13 | 2018-08-28 | 中国船舶重工集团公司第七〇九研究所 | A kind of protection flange plate structure parameter extracting method |
| CN108460201B (en) * | 2018-02-13 | 2021-09-07 | 中国船舶重工集团公司第七一九研究所 | Method for extracting structural parameters of protective flange plate |
| CN112268513A (en) * | 2020-10-15 | 2021-01-26 | 湖北三江航天红峰控制有限公司 | Insertion sheet type tunnel joint displacement sensor |
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Application publication date: 20150114 |