CN102853778A - Fiber grating strain sensor - Google Patents
Fiber grating strain sensor Download PDFInfo
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- CN102853778A CN102853778A CN2012102786823A CN201210278682A CN102853778A CN 102853778 A CN102853778 A CN 102853778A CN 2012102786823 A CN2012102786823 A CN 2012102786823A CN 201210278682 A CN201210278682 A CN 201210278682A CN 102853778 A CN102853778 A CN 102853778A
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Abstract
The invention relates to a fiber grating strain sensor. An elastic strain sheet is provided with a longitudinal shaft and is symmetrical along the longitudinal shaft, the elastic strain sheet comprises a pair of symmetrical U-shaped beam elastic structures, a flat plate for connecting the U-shaped beam elastic structures, a groove used for placing fiber grating and located on the longitudinal axis of the elastic strain sheet, a pair of rectangular holes used for a tail fiber to penetrate and located at two ends of the groove, a temperature compensation device, a fixed device and a sheath fixing device. The fiber grating is arranged in the groove, two ends of the fiber grating are fixed at corresponding positions by using glass welding materials through a point welding mode, the tail fiber penetrates through the rectangular holes and are located on the other surface of the elastic strain sheet, a sheath is used for protecting, and the fiber grating strain sensor is formed by the elastic strain sheet, the fiber grating, the sheath and an auxiliary device. The fiber grating strain sensor is simple in structure, large in measuring range, convenient to install and capable of eliminating interference of temperature on the sensor effectively.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of fiber Bragg grating strain sensor.
Background technology
Fiber grating is a kind of passive optical fiber devices in optical fiber communication, Fibre Optical Sensor and optical information processing field extensive application prospect.Have advantages of that based on the sensor of fiber grating anti-electromagnetic interference (EMI), volume are little, simple in structure, can realize Measurement accuracy in the rugged surroundings such as building, petrochemical complex.
Strain measurement is healthy, the safe important means of heavy construction such as monitoring bridge, dam.In recent years, the strain transducer development based on fiber grating is rapid.It is to improve sensor performance and protection fiber grating effective means that fiber grating is encapsulated.The researchist directly is pasted on fiber grating on the metal material, by metal material with strain transfer to fiber grating, cause the drift of optic fiber grating wavelength, but the deformation of metal material is limited, cause the measurement range of sensor less.In addition, in the scheme that the Chinese utility model patent notification number provides for CN202083359, fiber grating is pasted on semi-girder, by pull bar strain transfer is arrived semi-girder, and then optic fiber grating wavelength is drifted about, although this scheme can realize strain sensing, complicated in mechanical structure has the transmission of multiple power, error is larger, the unstable properties that causes sensor, and installation process is complicated, brings difficulty to site operation.
The present invention utilizes the elastic strain sheet that fiber grating is encapsulated, and realizes strain measurement, have advantages of simple in structure, measurement range is large, easy for installation.
Summary of the invention
Purpose of the present invention be exactly for overcome fiber Bragg grating strain sensor measurement range in the prior art little, complicated problem is installed, a kind of simple in structure, fiber Bragg grating strain sensor that measurement range is large, easy for installation is provided.
The present invention is the technical scheme that the technical solution problem is taked:
A kind of fiber Bragg grating strain sensor comprises elastic strain sheet, fiber grating, armouring sheath and auxiliary equipment.
The elastic strain sheet has longitudinal axis and rotational symmetry longitudinally, comprise the U-shaped beam elastic construction of a pair of symmetrical expression, connect U-shaped beam elastic construction flat board, be positioned at the stria that is used for placing fiber grating on the elastic strain sheet longitudinal axis, be positioned at the stria two ends and be used for a pair of rectangular opening, temperature compensation means, stationary installation and the armouring sheath stationary installation of passing tail optical fiber; Stationary installation comprises two groups of point of fixity, first group of point of fixity, the two pairs of semicircle rectangular channels or the mounting hole for being positioned in the vertical U-shaped beam elastic construction both sides, line between the every pair of point of fixity is all vertical with longitudinal axis, second group of point of fixity is the elastic construction with semicircle rectangular channel or mounting hole that is positioned at elastic strain sheet two ends, their are same to occur in pairs, and the line between the every pair of point of fixity is all vertical with longitudinal axis; Armouring sheath stationary installation is distributed in longitudinal axis, is included in the rectangular opening between the semicircle rectangular channel elastic construction, round-meshed semicircle rectangular channel and is positioned at the flat board of elastic strain sheet two ends band circular hole; Temperature compensation means between the U-shaped beam elastic construction of symmetrical expression and corresponding second group of point of fixity is the rectangle that is connected with the elastic strain sheet on one side; The U-shaped beam elastic construction of described elastic strain sheet, flat board, stria, the rectangular opening that passes tail optical fiber, temperature compensation means, stationary installation and armouring sheath stationary installation are the integral type structure; Fiber grating is placed in the stria, and its two ends utilize glass solder to be fixed in corresponding position by the mode of spot welding, and its tail optical fiber passes the another side that rectangular opening is positioned at the elastic strain sheet afterwards, then utilizes armouring sheath armouring; The plastics of armouring sheath certain-length are peeled off, a unstripped end places card jail in the rectangular opening, one section utilization of peeling off is passed the thin wire banding of circular hole in the semicircle rectangular channel and is fixed, with with the flat board of circular hole perpendicular to the elastic strain sheet, then the unstripped other end is passed the circular hole on the flat board and utilizes circular hole that its card is firmly fixed; Auxiliary equipment is round-meshed two derbies, by spot welding or screw the elastic strain sheet is fixed in derby at first group of point of fixity and second group of fixed point, then utilize welding or screw fixedly the derby of elastic strain sheet be fixed on the object under test; Elastic strain sheet, fiber grating, armouring sheath and auxiliary equipment consist of fiber Bragg grating strain sensor.
The beneficial effect that the present invention has is:
1, elastic deformation easily occurs in the U-shaped beam elastic construction of symmetrical expression after loading strain, has increased the measurement range of sensor.
2, fiber grating utilizes glass solder to be welded in the elastic strain sheet, the little and firm welding of solder joint, and difficult drop-off makes sensor can adapt to abominable working environment.
3, optical fiber passes rectangular opening and makes tail optical fiber and fiber grating be in respectively the two sides of elastic strain sheet; fiber Bragg grating strain sensor is fixed in after the object under test like this; fiber grating but not is exposed to the external world between object under test and elastic strain sheet, and then effectively protects fiber grating.
4, this sensor is fixed in object under test by first group of point of fixity and second group of point of fixity with the elastic strain sheet, first group of point of fixity is semicircle rectangular channel or the mounting hole of U-shaped beam elastic construction both sides, the elastic strain sheet is fixed in object under test, strain can load on the elastic strain sheet like this, and then causes the optic fiber grating wavelength drift; Second group of point of fixity is semicircle rectangular channel or the mounting hole in the elastic construction, be fixed in after the object under test elastic strain sheet and more be close to object under test, and elastic construction can be eliminated between first group of point of fixity and the second group of point of fixity strain to the interference of sensor.
5, in armouring sheath stationary installation, design three kinds of structures and the armouring sheath is completely fixed does not occur in the elastic strain sheet sliding.
6, fiber grating carries out pre-stretch-draw before being fixed in the elastic strain sheet, and fiber Bragg grating strain sensor can be measured the positive negative strain of object under test like this.
7, having designed stria at the elastic strain sheet places in the elastic strain sheet fiber grating, glass solder and thin wire; but not outside being exposed to; not only fiber grating, glass solder and thin wire are formed effective protection, and guaranteed the planarization of elastic strain sheet.
8, by auxiliary equipment the elastic strain sheet is fixed in object under test, has reduced installation difficulty, improved and be mounted to power.
Can find out from the technical scheme that foregoing invention provides, fiber Bragg grating strain sensor provided by the invention has designed temperature compensation means, just has temperature compensation function but must be welded with fiber grating in the stria of temperature compensation means.But in addition the present invention simplified design is removed temperature compensation means, can realize strain measurement equally.
Description of drawings
Fig. 1 is the front of structural representation of the present invention.
Fig. 2 is the reverse side of structural representation of the present invention.
Fig. 3 is the longitudinal view of structural representation of the present invention.
Fig. 4 is the structural representation of armouring sheath of the present invention.
Fig. 5 is the structural representation of auxiliary equipment of the present invention.
Fig. 6 is with the structural representation of mounting hole among 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.
Such as Fig. 1, shown in 2,3,4 and 5, a kind of fiber Bragg grating strain sensor of proposition comprises elastic strain sheet 1, fiber grating 11 and 12, armouring sheath 14 and auxiliary equipment 15.Elastic strain sheet 1 has longitudinal axis and rotational symmetry longitudinally, comprise the U-shaped beam elastic construction 5 of a pair of symmetrical expression, connect U-shaped beam elastic construction 5 flat board 10, be positioned at the stria 13 that is used for placing fiber grating 11 and 12 on elastic strain sheet 1 longitudinal axis, be positioned at stria 13 two ends and be used for a pair of rectangular opening 6, temperature compensation means 9, the stationary installation 7 of passing tail optical fiber, 8, armouring sheath stationary installation 2,3,4; Stationary installation comprises two groups of point of fixity, two pair semicircle rectangular channel or the mounting hole of first group of point of fixity 7 for being positioned in the vertical U-shaped beam elastic construction 5 both sides, line between the every pair of point of fixity is all vertical with longitudinal axis, second group of point of fixity 8 is for being positioned at the elastic construction with semicircle rectangular channel or mounting hole at elastic strain sheet 1 two ends, their are same to occur in pairs, and the line between the every pair of point of fixity is all vertical with longitudinal axis; Armouring sheath stationary installation 2,3,4 is distributed on the longitudinal axis, is included in the rectangular opening 4 between the semicircle rectangular channel elastic construction 8, round-meshed semicircle rectangular channel 3 and is positioned at the flat board 2 of elastic strain sheet two ends band circular hole; Temperature compensation means 9 between the U-shaped beam elastic construction 5 of symmetrical expression and corresponding second group of point of fixity 8 is the rectangle that is connected with elastic strain sheet 1 on one side; The U-shaped beam elastic construction 5 of described elastic strain sheet 1, flat board 10, stria 13, the rectangular opening 6 that passes fiber grating, temperature compensation means 9, stationary installation 7,8, armouring sheath stationary installation 2,3,4 are the integral type structure; Fiber grating 11,12 is placed in the stria 13, and its two ends utilize glass solder to be fixed in corresponding position by the mode of spot welding, and its tail optical fiber passes the another side that rectangular opening 6 is positioned at the elastic strain sheet afterwards, then utilizes armouring sheath 14 armourings; The plastics of armouring sheath 14 certain-lengths are peeled off, unstripped one section places rectangular opening 4 interior card jails, one section utilization of peeling off is passed the thin wire banding of circular hole 3 in the semicircle rectangular channel and is fixed, flat board 2 perpendicular to elastic strain sheet 1, is then passed another unstripped section the circular hole on dull and stereotyped 2 and utilizes circular hole that its card is firmly fixed; Auxiliary equipment 15 is round-meshed two derbies, by spot welding or screw elastic strain sheet 1 is fixed in derby at first group of point of fixity 7 and second group of point of fixity 8, then utilizes welding or screw to be fixed on the object under test with the fixing auxiliary equipment 15 of elastic strain sheet 1; Elastic strain sheet 1, fiber grating 11,12, armouring sheath 14 and auxiliary equipment 15 consist of fiber Bragg grating strain sensor.
The working method of present embodiment is: utilize welding or screw to be fixed in the derby of elastic strain sheet on the object under test, when object under test generation strain Δ L/L, strain namely loads on strain grating 11, and then cause the drift delta λ 1 of strain grating 11 reflection wavelengths, measure the wavelength shift Δ λ 1 of strain grating 11; Because temperature grating 12 and strain grating 11 are under the uniform temp, temperature variation is identical on the impact of the two, and wavelength variable quantity is Δ λ 2 all, deducts temperature and can instead obtain strain Δ L/L after on the impact of sensor.In this embodiment, the elastic strain sheet is of a size of 146 * 25.4 * 0.8mm, and the sensitivity of this device is about 1.1pm/ μ ε, and measurement range is ± 2500 μ ε.This device can realize that the gordian technique of strain measurement is:
1. elastic deformation easily occurs in the U-shaped beam elastic construction of symmetrical expression after loading strain, has increased the measurement range of sensor.
2. utilize glass solder that the elastic strain sheet is fixed in fiber grating spot welding, the little and firm welding of solder joint, difficult drop-off makes sensor can adapt to abominable working environment.
3. fiber grating passes rectangular opening; make tail optical fiber and fiber grating be in respectively the two sides of elastic strain sheet, the elastic strain sheet is fixed in after the object under test like this, and fiber grating is between object under test and elastic strain sheet; but not be exposed in the environment, fiber grating is formed effective protection.
4. the semicircle rectangular channel of elastic construction both sides is first group of point of fixity of elastic strain sheet, mode by spot welding in groove is fixed in object under test with the elastic strain sheet, the strain of object under test can load on the elastic strain sheet like this, and then causes the optic fiber grating wavelength drift; Semicircle rectangular channel in the elastic construction is second group of point of fixity of elastic strain sheet, and the elastic strain sheet is close to object under test more, and elastic construction wherein can be eliminated strain between first group of point of fixity and the second group of point of fixity to the interference of sensor.
5. one section plastics of armouring sheath are peeled off, unstripped like this part just forms projection, cooperates with the stationary installation of elastic strain sheet, and armouring sheath and elastic strain sheet are combined closely, and does not occur sliding.
6. the rectangular opening in the armouring sheath stationary installation can effectively block firm armouring sheath front end bossing, makes the armouring sheath not occur sliding in the plane at elastic strain sheet place; Narrow meshed circular arc rectangular channel in the armouring sheath stationary installation utilizes and passes the thin wire of aperture with armouring sheath banding; Described flat board perpendicular to elastic strain sheet band circular hole makes the swing of armouring sheath can not affect the part fixing with the elastic strain sheet.
7. fiber grating carries out pre-stretch-draw before being fixed in the elastic strain sheet, and fiber Bragg grating strain sensor can be measured the positive negative strain of object under test like this.
8. the stria on the elastic strain sheet longitudinal axis makes fiber grating in the elastic strain sheet, and fiber grating is formed effective protection.
9. the thin wire that narrow meshed circular arc rectangular channel makes fiber grating, glass solder and is used for banding armouring sheath in the stria on the elastic strain sheet longitudinal axis and the armouring sheath stationary installation is in the elastic strain sheet, has effectively guaranteed the planarization of elastic strain sheet.
10. the introducing of temperature compensation means can effectively be eliminated temperature to the interference of sensor.
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 (10)
1. a fiber Bragg grating strain sensor comprises elastic strain sheet, fiber grating, armouring sheath and auxiliary equipment, it is characterized in that:
The elastic strain sheet has longitudinal axis and rotational symmetry longitudinally, comprise the U-shaped beam elastic construction of a pair of symmetrical expression, connect U-shaped beam elastic construction flat board, be positioned at the stria that is used for placing fiber grating on the elastic strain sheet longitudinal axis, be positioned at the stria two ends and be used for a pair of rectangular opening, temperature compensation means, stationary installation and the armouring sheath stationary installation of passing tail optical fiber; Stationary installation comprises two groups of point of fixity, first group of point of fixity, the two pairs of semicircle rectangular channels or the mounting hole for being positioned in the vertical U-shaped beam elastic construction both sides, line between the every pair of point of fixity is all vertical with longitudinal axis, second group of point of fixity is the elastic construction with semicircle rectangular channel or mounting hole that is positioned at elastic strain sheet two ends, their are same to occur in pairs, and the line between the every pair of point of fixity is all vertical with longitudinal axis; Armouring sheath stationary installation is distributed in longitudinal axis, is included in the rectangular opening between the semicircle rectangular channel elastic construction, round-meshed semicircle rectangular channel and is positioned at the flat board of elastic strain sheet two ends band circular hole; Temperature compensation means between the U-shaped beam elastic construction of symmetrical expression and corresponding second group of point of fixity is the rectangle that is connected with the elastic strain sheet on one side; The U-shaped beam elastic construction of described elastic strain sheet, flat board, stria, the rectangular opening that passes tail optical fiber, temperature compensation means, stationary installation and armouring sheath stationary installation are the integral type structure; Fiber grating is placed in the stria, and its two ends utilize glass solder to be fixed in corresponding position by the mode of spot welding, and its tail optical fiber passes the another side that rectangular opening is positioned at the elastic strain sheet afterwards, then utilizes armouring sheath armouring; The plastics of armouring sheath certain-length are peeled off, a unstripped end places card jail in the rectangular opening, one section utilization of peeling off is passed the thin wire banding of circular hole in the semicircle rectangular channel and is fixed, with with the flat board of circular hole perpendicular to the elastic strain sheet, then the unstripped other end is passed the circular hole on the flat board and utilizes circular hole that its card is firmly fixed; Auxiliary equipment is round-meshed two derbies, by spot welding or screw the elastic strain sheet is fixed in derby at first group of point of fixity and second group of fixed point, then utilize welding or screw fixedly the derby of elastic strain sheet be fixed on the object under test; Elastic strain sheet, fiber grating, armouring sheath and auxiliary equipment consist of fiber Bragg grating strain sensor.
2. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that the fixed form of fiber grating is for utilizing glass solder spot welding.
3. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that the U-shaped beam elastic construction of symmetrical expression is axisymmetric a pair of U-shaped beam longitudinally.
4. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that having between the U-shaped beam elastic construction of a pair of symmetrical expression dull and stereotyped the connection.
5. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that the U-shaped beam elastic construction of a pair of symmetrical expression is between two point of fixity of fiber grating.
6. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that tail optical fiber and fiber grating are in respectively the two sides of elastic strain sheet.
7. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that the fiber grating point of fixity is at the mid point of first group of point of fixity line.
8. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that second group of point of fixity of foil gauge is positioned at the elastic construction at elastic strain sheet two ends.
9. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that first group of point of fixity of elastic strain sheet and between second group of point of fixity of homonymy temperature compensation means is arranged with it.
10. a kind of fiber Bragg grating strain sensor according to claim 1 is characterized in that the thin wire of fiber grating, glass solder and banding armouring sheath is in the elastic strain sheet, but not is exposed to outside the elastic strain plate plane.
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| CN2012102786823A CN102853778A (en) | 2012-08-06 | 2012-08-06 | Fiber grating strain sensor |
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| CN2012102786823A CN102853778A (en) | 2012-08-06 | 2012-08-06 | Fiber grating strain sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398667A (en) * | 2013-08-06 | 2013-11-20 | 温州大学 | Optical principle based fast plane deformation measuring device and method |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN104019759A (en) * | 2014-06-17 | 2014-09-03 | 中国航空工业集团公司北京长城计量测试技术研究所 | Ultrahigh strain sensor based on fiber bragg grating |
| CN104374330A (en) * | 2014-11-10 | 2015-02-25 | 上海交通大学 | Sensor temperature compensation device |
| CN106441140A (en) * | 2016-10-25 | 2017-02-22 | 武汉理工大学 | Fiber grating strain sensibilization sensor |
| CN106524937A (en) * | 2016-11-17 | 2017-03-22 | 北京邮电大学 | Fiber bragg grating strain device |
| CN109000576A (en) * | 2018-05-22 | 2018-12-14 | 苏州特鑫精密电子有限公司 | A kind of double groove equi intensity cantilever |
| CN109029512A (en) * | 2018-06-29 | 2018-12-18 | 中国船舶重工集团公司第七〇五研究所 | A kind of fiber-optic grating sensor glass solder package system |
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| CN2706739Y (en) * | 2004-05-10 | 2005-06-29 | 欧进萍 | Pre-stretching optical fiber raster big-scalar range strain sensor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398667A (en) * | 2013-08-06 | 2013-11-20 | 温州大学 | Optical principle based fast plane deformation measuring device and method |
| CN103398667B (en) * | 2013-08-06 | 2015-11-04 | 温州大学 | The quick measurement mechanism of a kind of plane deformation based on optical principle and method |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN104019759A (en) * | 2014-06-17 | 2014-09-03 | 中国航空工业集团公司北京长城计量测试技术研究所 | Ultrahigh strain sensor based on fiber bragg grating |
| CN104374330A (en) * | 2014-11-10 | 2015-02-25 | 上海交通大学 | Sensor temperature compensation device |
| CN106441140A (en) * | 2016-10-25 | 2017-02-22 | 武汉理工大学 | Fiber grating strain sensibilization sensor |
| CN106524937A (en) * | 2016-11-17 | 2017-03-22 | 北京邮电大学 | Fiber bragg grating strain device |
| CN106524937B (en) * | 2016-11-17 | 2019-09-20 | 北京邮电大学 | A kind of fiber grating strain device |
| CN109000576A (en) * | 2018-05-22 | 2018-12-14 | 苏州特鑫精密电子有限公司 | A kind of double groove equi intensity cantilever |
| CN109029512A (en) * | 2018-06-29 | 2018-12-18 | 中国船舶重工集团公司第七〇五研究所 | A kind of fiber-optic grating sensor glass solder package system |
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Application publication date: 20130102 |