CN102865827A - Fiber Bragg grating strain sensor - Google Patents
Fiber Bragg grating strain sensor Download PDFInfo
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- CN102865827A CN102865827A CN2012102319900A CN201210231990A CN102865827A CN 102865827 A CN102865827 A CN 102865827A CN 2012102319900 A CN2012102319900 A CN 2012102319900A CN 201210231990 A CN201210231990 A CN 201210231990A CN 102865827 A CN102865827 A CN 102865827A
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- bragg grating
- strain sensor
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Abstract
The invention relates to a fiber Bragg grating strain sensor which comprises an elastic structure, an optical fiber grating, protective sleeves, sealing rings, fixed structures and sealing joints. The elastic structure comprises an elastic area with alternately spaced cavities, metal sheets and thread screws. The elastic area, the metal sheets and the thread screws are in an integral structure. The cavities forming the elastic area are vertical to the central axis of a cylinder, pass over the central axis of the cylinder and are distributed on the elastic structure in a staggered arrangement manner. Both ends of the elastic structure are in threaded connection with the fixed structures. The metal sheets are arranged in the fixed structures. The other ends of the fixed structures are in threaded connection with one ends of the sealing joints for fixing armored jackets. Both ends of the fiber Bragg grating passing through the central axis of the elastic structure are fixedly arranged on protruding metal sheets at both ends of the elastic structure by glass solder. The sealing rings arranged at the inner side of the thread screws of the fixed structures and the protective sleeves seal the elastic area. When the sensor is buried, the fixed structure is a flange structure. The fiber Bragg grating strain sensor provided by the invention has the advantages of large measuring range and simpleness in installation.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of fiber Bragg Grating Strain Sensor device.
Background technology
Along with the progress of science and technology, the electrical type sensor is owing to be subject to electromagnetic interference (EMI), and complicated structure can not distributed measurement and remote monitoring, can not satisfy the requirement of society.In recent years, optical fiber Bragg grating sensor has anti-electromagnetic interference (EMI), collection sensing and is transmitted in the advantages such as one, simple structure because of it, has been widely used in the safety and Health monitoring field of Structural Engineering such as dykes and dams, bridge, tunnel and petrochemical industry etc.
The fiber Bragg Grating Strain Sensor device is used for monitoring the subtle change of object under test, has widely to use.In recent years, the fiber Bragg Grating Strain Sensor device has obtained good development.In the scheme that the Chinese utility model patent notification number provides for CN2651704Y, optical fiber Bragg raster is fixed in the I-shaped structure, although can realize strain measurement, but structure lacks flexibility, cause strain measurement range limited, easily cause the I-shaped structure distortion after repeatedly using in addition, need to proofread and correct and to continue to use.The present invention utilizes a kind of column type elastic construction that the Bragg grating is encapsulated, and can realize the flush type strain measurement, again can surface measurement, and have advantage easy for installation.
Summary of the invention
The object of the invention is exactly in order to overcome the problem that the strain transducer measurement range is little in the prior art, installation process is complicated, a kind of fiber Bragg Grating Strain Sensor device based on hole alternate intervals column type elastic construction to be provided.
The present invention is the technical scheme that the technical solution problem is taked:
The fiber Bragg Grating Strain Sensor device comprises elastic construction, optical fiber Bragg raster, protective casing, O-ring seal, fixed sturcture, sealed interface.
Elastic construction comprises elastic region, sheet metal and the screw thread of hole alternate intervals, and elastic region, sheet metal and screw thread are the integral type structure; The hole of formation elastic region is perpendicular to the right cylinder central shaft and cross the right cylinder central shaft, be staggered mode is distributed in elastic construction, and the elastic construction two ends are threaded with fixed sturcture, and sheet metal is in fixed sturcture; The sealed interface threaded one end of armouring sheath is connected the other end of fixed sturcture with being used for fixedly; The optical fiber Bragg raster two ends of passing the elastic construction central shaft utilize glass solder to be fixed on the sheet metal of elastic construction two ends projection; Being positioned at the O-ring seal and the protective casing that are connected and fixed structure screw thread inboard seals the elastic region.Elastic construction, optical fiber Bragg raster, protective casing, O-ring seal, fixed sturcture, sealed interface consist of the fiber Bragg Grating Strain Sensor device; Need to be fixed in object under test by base for supporting when this sensor is surface-type, fixed sturcture is fluted, the female tubular structure in two ends in surface; Fixed sturcture is flange arrangement when this sensor is flush type.The beneficial effect that the present invention has is:
1, optical fiber Bragg raster is sealed in the sensor fully, makes it avoid extraneous corrosion, is conducive to prolong the serviceable life of sensor.
2, according to the shape of fixed sturcture, this sensor can be used as flush type strain transducer and surface-type strain transducer.
3, elastic deformation easily occurs in elastic construction after loading strain, has increased the measurement range of sensor.
4, optical fiber Bragg raster carries out pre-stretch-draw before being fixed in elastic construction, and the fiber Bragg Grating Strain Sensor device can be measured the positive negative strain of object under test like this.
5, utilize glass solder that optical fiber Bragg raster is welded in the elastic construction two ends, the little and firm welding of solder joint, difficult drop-off makes sensor can adapt to abominable working environment.
Description of drawings
Fig. 1 is elastic construction synoptic diagram of the present invention.
Fig. 2 is the side view of elastic construction of the present invention.
Fig. 3 is embedded structure synoptic diagram of the present invention.
Fig. 4 is surface-type structural representation of the present invention.
Fig. 5 is bolt-tightened type member synoptic diagram of the present invention.
Fig. 6 is solder type member synoptic diagram of the present invention.
Fig. 7 is embedded type member synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described, but they do not consist of limitation of the invention, only for example, make advantage of the present invention become more clear and easily understanding.Fixed sturcture, sealed interface and base for supporting.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the fiber Bragg Grating Strain Sensor device comprises elastic construction 4, optical fiber Bragg raster 5, protective casing 6, O-ring seal 7, fixed sturcture 8, the sealed interface 9 of hole alternate intervals; Elastic construction 4 comprises elastic region 3, sheet metal 1 and screw thread 2, and elastic region 3, sheet metal 1 and screw thread 2 are the integral type structure; The hole of formation elastic region 3 is perpendicular to the right cylinder central shaft and cross the right cylinder central shaft, be staggered mode is distributed in elastic construction 4, and elastic construction 4 two ends are threaded with fixed sturcture 8, and sheet metal 1 is in fixed sturcture 8; Sealed interface 9 threaded one ends of armouring sheath are connected the other end of fixed sturcture 8 with being used for fixedly; Optical fiber Bragg raster 5 two ends of passing elastic construction 4 central shafts utilize glass solder to be fixed on the sheet metal 1 of elastic construction 4 two ends projections; Being positioned at the O-ring seal 7 and the protective casing 6 that are connected and fixed structure 8 screw thread inboards seals elastic region 3.Elastic construction 4, optical fiber Bragg raster 5, protective casing 6, O-ring seal 7, fixed sturcture 8, sealed interface 9 consist of the fiber Bragg Grating Strain Sensor device.
The working method of present embodiment is: the base for supporting 10 and 11 that the fixed sturcture 8 in the sensor is placed Fig. 5, or the base for supporting among Fig. 6 12 and 13, or between the base for supporting among Fig. 7 14 and 15, use bolted, the mode of then utilizing bolt to fix, weld or embed is fixed in determinand with base for supporting; According to changing direction the flush type strain transducer is imbedded object under test, get final product work after the curing.When object under test generation strain Δ L/L, strain namely loads on strain optical fiber Bragg raster 5, and then cause the drift delta λ of strain optical fiber Bragg raster 5 reflection wavelengths, and measure the wavelength shift Δ λ of strain optical fiber Bragg raster 5, can instead obtain strain variation Δ L/L.In this embodiment, the sensitivity of this device is about 1.2pm/ μ ε, and measurement range is ± 2500 μ ε.This device can realize that the key factor of strain measurement is:
1, designs the devices such as O-ring seal, protective casing and sealed interface optical fiber Bragg raster is sealed in the sensor fully, make it avoid extraneous corrosion, be conducive to prolong the serviceable life of sensor.
2, fixed sturcture can be designed to different shapes, from different member in conjunction with can be used as flush type strain transducer and surface-type strain transducer.
3, design hole alternate intervals type elastic construction, increased the measurement range of sensor.
4, optical fiber Bragg raster carries out pre-stretch-draw before being fixed in elastic construction, and the fiber Bragg Grating Strain Sensor device can be measured the positive negative strain of object under test like this.
5, utilize glass solder that the elastic strain sheet is fixed in optical fiber Bragg raster spot welding, the little and firm welding of solder joint, difficult drop-off makes sensor can adapt to abominable working environment.
6, the elastic region of hole alternate intervals, sheet metal and screw thread are the integral type structure.
The above only is the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore the protection domain that protection scope of the present invention should claims is as the criterion.
Claims (8)
1. a fiber Bragg Grating Strain Sensor device comprises elastic construction, fiber grating, protective casing, O-ring seal, fixed sturcture, sealed interface, it is characterized in that:
Elastic construction comprises elastic region, sheet metal and the screw thread of hole alternate intervals, and elastic region, sheet metal and screw thread are the integral type structure; The hole of formation elastic region is perpendicular to the right cylinder central shaft and cross the right cylinder central shaft, be staggered mode is distributed in elastic construction, and the elastic construction two ends are threaded with fixed sturcture, and sheet metal is in fixed sturcture; The sealed interface threaded one end of armouring sheath is connected the other end of fixed sturcture with being used for fixedly; The optical fiber Bragg raster two ends of passing the elastic construction central shaft utilize glass solder to be fixed on the sheet metal of elastic construction two ends projection; Being positioned at the O-ring seal and the protective casing that are connected and fixed structure screw thread inboard seals the elastic region; Elastic construction, optical fiber Bragg raster, protective casing, O-ring seal, fixed sturcture, sealed interface consist of the fiber Bragg Grating Strain Sensor device; Need to be fixed in object under test by base for supporting when this sensor is surface-type, fixed sturcture is fluted, the female tubular structure in two ends in surface; Fixed sturcture is flange arrangement when this sensor is flush type.
2. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1 is characterized in that the fixed form of optical fiber Bragg raster is for utilizing glass solder spot welding.
3. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1 is characterized in that the elastic region is made of the hole of alternate intervals.
4. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1, when it is characterized in that sensor is the surface-type sensor, fixed sturcture is for being fluted, the female tubular structure in two ends in surface.
5. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1, it is characterized in that by base for supporting with the surface-type optical fiber Bragg raster by welding, bolt is fixed and the mode that embeds is fixed in object under test.
6. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1 is characterized in that base for supporting and fixed sturcture agree with fully and by bolt fixed sturcture fixed.
7. a kind of fiber Bragg Grating Strain Sensor device as claimed in claim 1 is characterized in that sheet metal is in fixed sturcture.
8. a kind of fiber Bragg grating strain sensor as claimed in claim 1 is characterized in that it is the integral type structure that sheet metal, elasticity are gone with screw thread.
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| CN2012102319900A CN102865827A (en) | 2012-06-29 | 2012-06-29 | Fiber Bragg grating strain sensor |
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| CN2012102319900A CN102865827A (en) | 2012-06-29 | 2012-06-29 | Fiber Bragg grating strain sensor |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809352A (en) * | 2012-08-08 | 2012-12-05 | 上海森首光电科技有限公司 | Strain sensor for fiber bragg grating |
| CN103148796A (en) * | 2013-02-28 | 2013-06-12 | 永大科技集团有限公司 | Strain sensor |
| CN103307995A (en) * | 2013-06-27 | 2013-09-18 | 石家庄铁道大学 | Bidirectional long-gauge-length fiber grating strain sensor |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN104048615A (en) * | 2014-06-30 | 2014-09-17 | 国家电网公司 | Spot welding fiber bragg grating strain sensor and installation method thereof |
| CN104235150A (en) * | 2013-06-19 | 2014-12-24 | 杨春足 | Sensing screw device and system capable of synchronously pre-tensioning fiber bragg grating and bolt |
| CN104279973A (en) * | 2014-09-26 | 2015-01-14 | 北京遥测技术研究所 | Wide-range fiber bragg grating strain sensor |
| CN104330046A (en) * | 2014-11-13 | 2015-02-04 | 中国船舶重工集团公司第七0四研究所 | Fiber bragg grating torque sensor structure applicable to underwater environment |
| CN104374502A (en) * | 2014-11-10 | 2015-02-25 | 上海交通大学 | Device for monitoring pipe joint weld joint stress state of jacket platform |
| CN104441571A (en) * | 2014-11-04 | 2015-03-25 | 北京石油化工学院 | Method for measuring temperature of polymer melt on screw rod surface |
| CN105627941A (en) * | 2014-10-30 | 2016-06-01 | 北京航空航天大学 | FBG (fiber bragg grating) strain sensor |
| 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 |
| CN107167165A (en) * | 2017-06-20 | 2017-09-15 | 中国人民解放军63729部队 | Hypogee Fiber Bragg Grating Sensor Array and its protector and construction method |
| CN107300365A (en) * | 2017-08-15 | 2017-10-27 | 浙江智远光电科技有限公司 | High precision and high sensitivity fiber Bragg grating strain sensor |
| CN107560643A (en) * | 2017-08-15 | 2018-01-09 | 浙江智远光电科技有限公司 | The method for packing of the structural mechanics sensor of femtosecond laser direct write grating |
| CN108759681A (en) * | 2018-04-28 | 2018-11-06 | 中国神华能源股份有限公司 | Fiber-optic grating sensor |
| CN109983300A (en) * | 2016-09-26 | 2019-07-05 | 霍廷格·鲍德温测量技术有限责任公司 | The strain transducer that can be welded for curved surface |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN110057480A (en) * | 2019-05-21 | 2019-07-26 | 衢州学院 | A kind of the fiber grating torque sensor and its installation method of forked type conjugated structure |
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| CN202133378U (en) * | 2011-05-12 | 2012-02-01 | 北京基康科技有限公司 | Fiber grating strain sensor |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809352A (en) * | 2012-08-08 | 2012-12-05 | 上海森首光电科技有限公司 | Strain sensor for fiber bragg grating |
| CN103148796B (en) * | 2013-02-28 | 2016-08-03 | 永大科技集团有限公司 | Strain transducer |
| CN103148796A (en) * | 2013-02-28 | 2013-06-12 | 永大科技集团有限公司 | Strain sensor |
| CN104235150B (en) * | 2013-06-19 | 2017-02-08 | 杨春足 | Sensing screw device and system capable of synchronously pre-tensioning fiber bragg grating and bolt |
| CN104235150A (en) * | 2013-06-19 | 2014-12-24 | 杨春足 | Sensing screw device and system capable of synchronously pre-tensioning fiber bragg grating and bolt |
| CN103307995A (en) * | 2013-06-27 | 2013-09-18 | 石家庄铁道大学 | Bidirectional long-gauge-length fiber grating strain sensor |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN104048615A (en) * | 2014-06-30 | 2014-09-17 | 国家电网公司 | Spot welding fiber bragg grating strain sensor and installation method thereof |
| CN104048615B (en) * | 2014-06-30 | 2017-02-15 | 国网河南省电力公司电力科学研究院 | Spot welding fiber bragg grating strain sensor and installation method thereof |
| CN104279973A (en) * | 2014-09-26 | 2015-01-14 | 北京遥测技术研究所 | Wide-range fiber bragg grating strain sensor |
| CN105627941A (en) * | 2014-10-30 | 2016-06-01 | 北京航空航天大学 | FBG (fiber bragg grating) strain sensor |
| CN104441571A (en) * | 2014-11-04 | 2015-03-25 | 北京石油化工学院 | Method for measuring temperature of polymer melt on screw rod surface |
| CN104374502A (en) * | 2014-11-10 | 2015-02-25 | 上海交通大学 | Device for monitoring pipe joint weld joint stress state of jacket platform |
| CN104330046A (en) * | 2014-11-13 | 2015-02-04 | 中国船舶重工集团公司第七0四研究所 | Fiber bragg grating torque sensor structure applicable to underwater environment |
| CN109983300A (en) * | 2016-09-26 | 2019-07-05 | 霍廷格·鲍德温测量技术有限责任公司 | The strain transducer that can be welded for curved surface |
| CN109983300B (en) * | 2016-09-26 | 2021-02-09 | 霍廷格·鲍德温测量技术有限责任公司 | Weldable strain gauge for curved surfaces |
| 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 |
| CN107167165A (en) * | 2017-06-20 | 2017-09-15 | 中国人民解放军63729部队 | Hypogee Fiber Bragg Grating Sensor Array and its protector and construction method |
| CN107560643A (en) * | 2017-08-15 | 2018-01-09 | 浙江智远光电科技有限公司 | The method for packing of the structural mechanics sensor of femtosecond laser direct write grating |
| CN107300365A (en) * | 2017-08-15 | 2017-10-27 | 浙江智远光电科技有限公司 | High precision and high sensitivity fiber Bragg grating strain sensor |
| CN108759681A (en) * | 2018-04-28 | 2018-11-06 | 中国神华能源股份有限公司 | Fiber-optic grating sensor |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN110057480A (en) * | 2019-05-21 | 2019-07-26 | 衢州学院 | A kind of the fiber grating torque sensor and its installation method of forked type conjugated structure |
| CN110057480B (en) * | 2019-05-21 | 2024-02-06 | 衢州学院 | Fiber bragg grating torque sensor with fork-shaped conjugated structure and installation method thereof |
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Application publication date: 20130109 |