CN108955540A - A kind of fiber grating displacement sensor - Google Patents
A kind of fiber grating displacement sensor Download PDFInfo
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- CN108955540A CN108955540A CN201810989931.7A CN201810989931A CN108955540A CN 108955540 A CN108955540 A CN 108955540A CN 201810989931 A CN201810989931 A CN 201810989931A CN 108955540 A CN108955540 A CN 108955540A
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- cylinder
- fiber grating
- rotating bar
- pedestal
- displacement sensor
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- 239000000835 fiber Substances 0.000 title claims abstract description 55
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 31
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 24
- 230000009471 action Effects 0.000 claims abstract description 4
- 210000000481 breast Anatomy 0.000 claims abstract description 4
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 abstract description 11
- 230000007774 longterm Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 208000013469 light sensitivity Diseases 0.000 description 1
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- 239000000382 optic material Substances 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention discloses a kind of fiber grating displacement sensors, including pedestal, push rod, the first fiber grating, the second fiber grating, the first rotating bar, the second rotating bar；The side of pedestal is provided with optical fiber hole, and upside is provided with through-hole, and the bosom of pedestal is equipped with the first cylinder, the second cylinder and third cylinder, and third cylinder is located at the center of pedestal, and the first cylinder and the second cylinder are located at the two sides up and down of third cylinder；The top of third cylinder is fixed in one end that first rotating bar and the second rotating bar connect, and the other end is hanging；Rotating bar rotates freely under the action of push rod around third cylinder；The both ends of first fiber grating and the second fiber grating bypass the both ends that the first rotating bar and the second rotating bar are fixed on after the first cylinder and the second cylinder respectively；Optical fiber pigtail is drawn by optical fiber hole.Transducer sensitivity height provided by the invention, electromagnetism interference, no signal distortion, structure is simple, stability is high, can long-term real time on-line monitoring.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of fiber grating displacement sensor.
Background technique
Displacement monitoring is one of measure the item most basic in monitoring structural health conditions, is filled to the real-time monitoring of displacement in machinery
Deformation, cracking, the sliding of the major designs such as standby, civil engineering play an important role in monitoring.Currently, application in terms of displacement monitoring
Most is traditional electrical sensor, but electrical sensor exists vulnerable to electromagnetic interference, stability is poor, it is long-term real-time to be difficult to
The disadvantages of monitoring and the field work environment severe vulnerable to complexity influence, for being difficult to ensure measurement essence in displacement deformation measurement
Degree, and do not have remote monitoring and data-transformation facility, cause the application of electrical sensor to receive very big limitation.Therefore,
Urgently research and development are highly sensitive, anti-electromagnetic interference capability is strong, adapt to complicated adverse circumstances can long-term real-time monitoring displacement sensing
Device.
In the case, fiber-optic grating sensor comes into being.Fiber grating utilizes the light sensitivity of fiber optic materials, in fibre core
Interior formation space phase grating.Due to peculiar advantage, fiber grating is widely used in the design of sensor.Existing optical fiber
Grating sensor has the following problems: vertical pulling grating, and grating one end is fixed, and the other end is connected to mobile terminal, but this method range
Very small (0.6mm), and be easy to break grating；Cantilever beam structure is pasted onto cantilever beam upper and lower surface reality using double optical fiber grating
Existing temperature-compensating, but the size sensor of this method is larger, and wedge block easily causes the movement of vertical direction in level sliding, in phase
In the case of same horizontal displacement, the minute movement of vertical direction can change the amount of deflection of cantilever beam, so that grating wavelength changes,
Reduce the accuracy of measurement of sensor.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention provides a kind of fiber grating displacement sensor, the biographies
Sensor high sensitivity, electromagnetism interference, no signal distortion, structure is simple, stability is high, can long-term real time on-line monitoring.
For this purpose, the invention adopts the following technical scheme:
A kind of fiber grating displacement sensor, including pedestal, push rod, the first fiber grating, the second fiber grating, first turn
Lever, the second rotating bar；The side of the pedestal is provided with optical fiber hole, and upside is provided with through-hole, and the bosom of pedestal is equipped with the
One cylinder, the second cylinder and third cylinder, the third cylinder are located at the center of pedestal, first cylinder and the second cylinder point
Not Wei Yu third cylinder two sides up and down；First rotating bar and the second rotating bar are end to end horizontally disposed, one to connect
The top of third cylinder is fixed at end, and the other end is hanging；The push rod be Trident Type structure, upward one end pass through upper through-hole with
Measurand is connected, and downward Liang Ge branch contradicts the first rotating bar and the second rotating bar, effect of the rotating bar in push rod respectively
Under rotated freely around third cylinder；The both ends of first fiber grating and the second fiber grating bypass the first cylinder and respectively
The both ends of the first rotating bar and the second rotating bar are fixed on after two cylinders；Optical fiber pigtail is connected to demodulation after drawing by optical fiber hole
Device.
Preferably, first fiber grating and the second fiber grating are fixed at both ends after pre-stretching.
It preferably, further include adhesive, first fiber grating and the second fiber grating are fixed on the using adhesive
The both ends of one rotating bar and the second rotating bar.
Preferably, the surfaces slippery enough of first cylinder, the second cylinder and third cylinder, the first cylinder and the second circle
Column symmetry is arranged in the two sides of third cylinder, and three cylinders are an integral structure with pedestal.
Preferably, first rotating bar and the second rotating bar are provided with torsional spring in the bearing of third cylinder, for not
Drawn stem is returned to initial position when acting on.
Preferably, it is provided with spring between the push rod and upper through-hole, for realizing the reciprocating motion of push rod.
Preferably, Loose tube is cased with by the optical fiber pigtail that optical fiber hole is drawn and is protected using armouring pillar.
Preferably, the material of the pedestal and push rod is aluminium alloy, the material of first rotating bar and the second rotating bar
Matter is steel alloy.
Preferably, the shape of the pedestal includes cuboid-type mount structure, square figure mount structure, ball-type mount structure.
Compared with prior art, the beneficial effects of the present invention are:
(1) using fiber grating pre-stretching and packaged type that two o'clock is pasted, and two rotating bars are freely rotated and direct
Cause grating tension or in compression, substantially increase its sensitivity, while avoiding cumbersome full paste process and its this stickup
Inaccuracy is measured caused by signal distortion caused by mode.
(2) two grating stress are overlapped effective raising to its wavelength shift always on the contrary, local environment is consistent
Temperature-compensating performance.
(3) structure is simple, and anti-electromagnetic interference capability is strong, and installation and debugging are convenient, is suitable for various complex environments, labyrinth
The long-term real-time monitoring of displacement.
(4) various informative, it is small in size, it is easy to use.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of fiber grating displacement sensor provided by the present invention.
Fig. 2 is the structural schematic diagram of pedestal.
Description of symbols: 1, pedestal；2, push rod；3, the first fiber grating；4, the second fiber grating；5, the first rotation
Bar；6, the second rotating bar；7, adhesive；1-1, optical fiber hole；1-2, upper through-hole；1-3, the first cylinder；1-4, the second cylinder；1-5,
Third cylinder.
Specific embodiment
With reference to the accompanying drawing and specific embodiment come the present invention will be described in detail, specific embodiment therein and explanation only
For explaining the present invention, but it is not as a limitation of the invention.
As depicted in figs. 1 and 2, the invention discloses a kind of fiber grating displacement sensors, including pedestal 1, push rod 2,
One fiber grating 3, the second fiber grating 4, the first rotating bar 5, the second rotating bar 6；The side of the pedestal 1 is provided with optical fiber hole 1-
1, upside is provided with through-hole 1-2, and the bosom of pedestal 1 is equipped with the first cylinder 1-3, the second cylinder 1-4 and third cylinder 1-5,
The third cylinder 1-5 is located at the center of pedestal 1, and the first cylinder 1-3 and the second cylinder 1-4 are located at third cylinder 1-
5 two sides up and down；First rotating bar 5 and the second rotating bar 6 are end to end horizontally disposed, and third is fixed in the one end to connect
The top of cylinder 1-5, the other end are hanging；The push rod 2 is Trident Type structure, and upward one end passes through upper through-hole 1-2 and is tested
Object is connected, and downward Liang Ge branch contradicts the first rotating bar 5 and the second rotating bar 6 respectively, and rotating bar is under the action of push rod 2
It is rotated freely around third cylinder 1-5；The both ends of first fiber grating 3 and the second fiber grating 4 bypass the first cylinder respectively
The both ends of the first rotating bar 5 and the second rotating bar 6 are fixed on after 1-3 and the second cylinder 1-4；Optical fiber pigtail passes through optical fiber hole 1-1
Demodulating equipment is connected to after extraction.
Specifically, first fiber grating 3 and the second fiber grating 4 are fixed at both ends after pre-stretching.
It specifically, further include adhesive 7, first fiber grating 3 and the second fiber grating 4 are fixed using adhesive 7
In the both ends of the first rotating bar 5 and the second rotating bar 6.
Specifically, the surfaces slippery enough of the first cylinder 1-3, the second cylinder 1-4 and third cylinder 1-5, the first circle
Column 1-3 and the second cylinder 1-4 is arranged symmetrically in the two sides of third cylinder 1-5, and three cylinders are an integral structure with pedestal 1.
Specifically, the bearing of first rotating bar 5 and the second rotating bar 6 in third cylinder 1-5 is provided with torsional spring, uses
Initial position is returned to when the effect of not drawn stem 2.
Specifically, it is provided with spring between the push rod 2 and upper through-hole 1-2, for realizing the reciprocating motion of push rod 2.
Specifically, Loose tube is cased with by the optical fiber pigtail that optical fiber hole 1-1 is drawn and is protected using armouring pillar.
Specifically, the material of the pedestal 1 and push rod 2 is aluminium alloy, first rotating bar 5 and the second rotating bar 6
Material be steel alloy.
Specifically, the shape of the pedestal 1 includes cuboid-type mount structure, square figure mount structure, ball-type mount structure.
Embodiment
A kind of fiber grating displacement sensor can arbitrarily change its shape according to practical application, and push rod 2 is for sensing the external world
Change in displacement；It can be moved back and forth under innerspring effect；When extraneous change in displacement, pushed simultaneously by push rod 2
First rotating bar 5 is freely rotated with the second rotating bar 6 around third cylinder 1-5；When the external world, tested displacement reduces even zero,
First rotating bar 5 can be replied with the second rotating bar 6 under the action of torsional spring with the reply of push rod 2；First fiber grating, 3 He
The both ends of second fiber grating 4 bypass the first cylinder 1-3 and the second cylinder 1-4 respectively, and one end welding protection of two gratings is simultaneously
Its appropriate location is individually fixed in after pre-stretching using adhesive 7 both ends of first rotating bar 5 and the second rotating bar 6；
Tail optical fiber, which draws from optical fiber hole 1-1 and passes through data processing equipment, connects demodulated equipment.Specific detection process is as follows: when the external world is displaced
When variation, by taking displacement increases as an example, push rod 2 pushes the first rotating bar 5 and the second rotating bar 6 to turn over centainly around third cylinder 1-5
Angle so that 3 tension of the first grating and cause raster center wavelength occur red shift, and the second grating 4 be pressurized and cause in grating
Cardiac wave is long to occur blue shift, using the difference of the drift value of two gratings as sensor output signal, eliminates temperature and displacement
Cross sensitivity, to be finally inversed by extraneous tested displacement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to restrict the invention, all in essence of the invention
Made any modification, equivalent replacement and improvement etc., should be included in protection scope of the present invention within mind and spirit
Within.
Claims (9)
1. a kind of fiber grating displacement sensor, including pedestal (1), push rod (2), the first fiber grating (3), the second fiber grating
(4), the first rotating bar (5), the second rotating bar (6), it is characterised in that: the side of the pedestal (1) is provided with optical fiber hole (1-1),
Upside is provided with through-hole (1-2), and the bosom of pedestal (1) is equipped with the first cylinder (1-3), the second cylinder (1-4) and third circle
Column (1-5), the third cylinder (1-5) are located at the center of pedestal (1), first cylinder (1-3) and the second cylinder (1-4) point
Not Wei Yu third cylinder (1-5) two sides up and down；First rotating bar (5) and the end to end horizontal cloth of the second rotating bar (6)
It sets, the top of third cylinder (1-5) is fixed in the one end to connect, and the other end is hanging；The push rod (2) is Trident Type structure, to
On one end pass through upper through-hole (1-2) and be connected with measurand, downward Liang Ge branch contradicts the first rotating bar (5) and the respectively
Two rotating bars (6), rotating bar rotate freely under the action of push rod (2) around third cylinder (1-5)；First fiber grating
(3) and the both ends of the second fiber grating (4) bypass the first cylinder (1-3) and the second cylinder (1-4) respectively after be fixed on first turn
The both ends of lever (5) and the second rotating bar (6)；Optical fiber pigtail is connected to demodulating equipment after drawing by optical fiber hole (1-1).
2. a kind of fiber grating displacement sensor according to claim 1, it is characterised in that: first fiber grating
(3) it is fixed at both ends after pre-stretching with the second fiber grating (4).
3. a kind of fiber grating displacement sensor according to claim 2, it is characterised in that: further include adhesive (7), institute
It states the first fiber grating (3) and the second fiber grating (4) and is fixed on the first rotating bar (5) and the second rotation using adhesive (7)
The both ends of bar (6).
4. a kind of fiber grating displacement sensor according to claim 1, it is characterised in that: first cylinder (1-3),
The surfaces slippery enough of second cylinder (1-4) and third cylinder (1-5), the first cylinder (1-3) and the second cylinder (1-4) symmetrical cloth
It sets in the two sides of third cylinder (1-5), three cylinders are an integral structure with pedestal (1).
5. a kind of fiber grating displacement sensor according to claim 1, it is characterised in that: first rotating bar (5)
Bearing with the second rotating bar (6) in third cylinder (1-5) is provided with torsional spring, is returned to when acting on for not drawn stem (2)
Initial position.
6. a kind of fiber grating displacement sensor according to claim 1, it is characterised in that: the push rod (2) is led to upper
It is provided with spring between hole (1-2), for realizing the reciprocating motion of push rod (2).
7. a kind of fiber grating displacement sensor according to claim 1, it is characterised in that: drawn by optical fiber hole (1-1)
Optical fiber pigtail out is cased with Loose tube and is protected using armouring pillar.
8. a kind of fiber grating displacement sensor according to any one of claim 1 to 7, it is characterised in that: the base
The material of seat (1) and push rod (2) is aluminium alloy, and the material of first rotating bar (5) and the second rotating bar (6) is alloy
Steel.
9. a kind of fiber grating displacement sensor according to claim 8, it is characterised in that: the shape of the pedestal (1)
Including cuboid-type mount structure, square figure mount structure, ball-type mount structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989931.7A CN108955540B (en) | 2018-08-28 | 2018-08-28 | Fiber bragg grating displacement sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989931.7A CN108955540B (en) | 2018-08-28 | 2018-08-28 | Fiber bragg grating displacement sensor |
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| CN108955540A true CN108955540A (en) | 2018-12-07 |
| CN108955540B CN108955540B (en) | 2024-04-02 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4461536A (en) * | 1981-09-10 | 1984-07-24 | Board Of Trustees Of Leland Stanford Jr. University | Fiber coupler displacement transducer |
| US20090022450A1 (en) * | 2007-03-21 | 2009-01-22 | Gangbing Song | Design and performance of a fiber bragg grating displacement sensor for measurement of movement |
| CN101782442A (en) * | 2009-05-13 | 2010-07-21 | 东北大学 | Novel fiber grating pressure transducer |
| KR101057309B1 (en) * | 2010-12-30 | 2011-08-16 | 이금석 | Apparatus for measuring convergence using fiber bragg grating sensor |
| US20110242546A1 (en) * | 2010-03-31 | 2011-10-06 | Glen Peter Koste | System For Monitoring a Relative Displacement of Components |
| CN102878937A (en) * | 2012-09-29 | 2013-01-16 | 无锡市政设计研究院有限公司 | Integrated displacement and angle sensor with fiber Bragg gratings |
| CN202974522U (en) * | 2012-11-01 | 2013-06-05 | 中国科学院半导体研究所 | Fiber bragg grating soil pressure sensor based on two L-shaped beams |
| CN107131833A (en) * | 2017-04-28 | 2017-09-05 | 徐梦雪 | The distributed high precision optical fiber grating displacement transducer with temperature-compensating and method |
| CN208588326U (en) * | 2018-08-28 | 2019-03-08 | 刘绍波 | A kind of fiber grating displacement sensor |
-
2018
- 2018-08-28 CN CN201810989931.7A patent/CN108955540B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4461536A (en) * | 1981-09-10 | 1984-07-24 | Board Of Trustees Of Leland Stanford Jr. University | Fiber coupler displacement transducer |
| US20090022450A1 (en) * | 2007-03-21 | 2009-01-22 | Gangbing Song | Design and performance of a fiber bragg grating displacement sensor for measurement of movement |
| CN101782442A (en) * | 2009-05-13 | 2010-07-21 | 东北大学 | Novel fiber grating pressure transducer |
| US20110242546A1 (en) * | 2010-03-31 | 2011-10-06 | Glen Peter Koste | System For Monitoring a Relative Displacement of Components |
| KR101057309B1 (en) * | 2010-12-30 | 2011-08-16 | 이금석 | Apparatus for measuring convergence using fiber bragg grating sensor |
| CN102878937A (en) * | 2012-09-29 | 2013-01-16 | 无锡市政设计研究院有限公司 | Integrated displacement and angle sensor with fiber Bragg gratings |
| CN202974522U (en) * | 2012-11-01 | 2013-06-05 | 中国科学院半导体研究所 | Fiber bragg grating soil pressure sensor based on two L-shaped beams |
| CN107131833A (en) * | 2017-04-28 | 2017-09-05 | 徐梦雪 | The distributed high precision optical fiber grating displacement transducer with temperature-compensating and method |
| CN208588326U (en) * | 2018-08-28 | 2019-03-08 | 刘绍波 | A kind of fiber grating displacement sensor |
Non-Patent Citations (1)
| Title |
|---|
| 崔留住;江毅;刘有海;: "具有温度补偿的光纤位移传感器", 光子学报, no. 11, 15 November 2011 (2011-11-15) * |
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| CN108955540B (en) | 2024-04-02 |
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