CN102495235A - Fiber bragg grating sensor for 3D acceleration measurement - Google Patents
Fiber bragg grating sensor for 3D acceleration measurement Download PDFInfo
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- CN102495235A CN102495235A CN2011103587023A CN201110358702A CN102495235A CN 102495235 A CN102495235 A CN 102495235A CN 2011103587023 A CN2011103587023 A CN 2011103587023A CN 201110358702 A CN201110358702 A CN 201110358702A CN 102495235 A CN102495235 A CN 102495235A
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Abstract
The invention relates to a fiber bragg grating sensor for 3D acceleration measurement, which consists of a steel pipe, a mass block, five fiber gratings, a housing base and an optical cable output protective splice, wherein the two ends of the steel pipe are fixedly tensioned on the housing base; the mass block is fixed in the middle of the steel pipe; four fiber gratings are axially adhered to the surface of the steel pipe on one side of the mass block with the maximum stress strain and distributed at the periphery of the steel pipe with 90DEG position angle; the other fiber grating is adhered to the surface of the steel pipe on the other side of the mass block and corresponds with one fiber grating of the four fiber gratings; and the optical fibers at the two ends of the five fiber gratings that are connected in series are led out from the optical cable output protective splice. The invention forms a steel pipe-mass elastic structural body, the vibration acceleration of the elastic structural body in different directions can be sensed according to the wavelength difference of the two-combined fiber grating pairs, 3D measurement and temperature compensation are performed, and the fiber bragg grating sensor has a simple structure and is convenient to use.
Description
Technical field
The present invention relates to a kind of optical fibre grating acceleration sensor, relate in particular to the fiber-optic grating sensor that a kind of three-dimensional acceleration is measured.Belong to field of sensing technologies.
Technical background
It is little that optical fiber grating sensing has size, in light weight, anti-electromagnetic interference (EMI), and the advantage that reusability waits other type sensor not possess well, development in recent years is rapid, and various optical fiber grating sensing products obtain exploitation and widespread use.Optical fiber raster vibration/acceleration transducer is at Aero-Space, giant mechanical and electrical equipment, and each engineering field widespread use such as bridge construction also plays a significant role.A kind of vibration transducer that is applied to " L " type of bridge health monitoring like people such as Sun Rujiao proposition; " L " type of utilization lever construction converts the mass vibration into to grating stretching; Sensor has very high sensitivity; But the direct stretching to grating can cause grating to be prone to broken, and sensor life-time can not get ensureing.The patent No. is 200720300082 Chinese patent " a kind of novel optical fiber and optical grating high frequency acceleration transducer "; With steel wire or steel pipe and mass composition elastic system; Along steel wire axial vibration; Overcome the low shortcoming of cantilever beam type vibration transducer frequency response speed, and realized temperature self-compensation.The Chinese patent of the patent No. 200710177787.9 " a kind of optical fibre vibration sensor " adopts traditional cantilever beam structure, the composed of external damping system; Under the high speed Dynamic Signal; Sensor can truly reflect measured signal, but damping system is prone to temperature influence, makes sensor parameters unstable.The Chinese patent of the patent No. 201010544589.3 " a kind of optical fibre grating acceleration sensor " based on the wavy metal tubular construction; A metallic bellows and a mass are encapsulated in the metallic cylinder; Very strong anti-horizontal interference performance and sensitivity have been obtained; But sensor is that grating is directly stretched equally, and the grating life-span can not get guaranteeing.Above-mentioned various structure sensor all can only be implemented in the measurement on the single direction, and needs to measure vibration and the amount of acceleration on the three-dimensional in a lot of actual engineering.Multi-dimensional vibration sensor in the market is main with piezoelectricity, condenser type mainly; Do not possess advantages such as the passive nothing electricity of Fibre Optical Sensor, anti-electromagnetic interference (EMI), distributed measurement; And mostly adopt fabricated structure, certainly will cause like this that sensor bulk is excessive, precision is low, processed complex.Propose in " Triaxial Bragg Grating Accelerometer " literary composition that it is delivered like people such as S.R.K.Morikawa; On three directions of cylinder mass, punch; Three pairs of fiber gratings are passed the glutinous agent of circular hole blended rubber to be fixed; Can realize that three-dimensional vibrating measures, equally directly fiber grating carried out tension and compression during this structure working sensor, highly sensitive but grating is easily broken.The Chinese patent of the patent No. 200710151178.6 " optical fibre grating three-dimensional acceleration/vibration sensor " adopts three semi-girders combinations to realize three-dimensional measurements, and this simple splicing structure poor stability, the scope of application are little, assembling trouble comparatively.The utility model of patent No. ZL200720021749.X " three-component optical fiber raster vibration sensor "; Three fiber gratings are pasted on respectively on three block rubbers; Through mass the acting force of rubber is changed grating wavelength, this structure rubber material temperature influence is bigger, does not possess the temperature self-compensation function; And the vibration on all directions of testee can not well pass to sensor, the easy distortion of sensor output signal.
Summary of the invention
The present invention proposes a kind of " elastic structure " and 5 fiber gratings that stick on the steel tube surface that utilize simple " steel pipe-mass " to form and realize the optical fibre grating acceleration sensor that three-dimensional acceleration is measured.
Technical scheme of the present invention is following: the fiber-optic grating sensor that a kind of three-dimensional acceleration is measured, mainly form by steel pipe, mass, five fiber gratings, package header and optical cable output protection joints; Its steel pipe two ends stretch-draw is fixed on the described package header; Described mass is fixed in described steel pipe centre position; Wherein four fiber gratings stick on the maximum of the steel tube surface strain of described mass one side; Be distributed in the described steel pipe circumference in edge and be on the azimuthal position of 90 degree, the stickup direction is axial along steel pipe; Another fiber grating sticks on the described mass opposite side steel tube surface, and is symmetrical with the some gratings in preceding four gratings, and two ends optical fiber was drawn from optical cable output protection joint after five fiber gratings were serially connected.
In the technical scheme of the present invention, described five gratings equate to the distance of mass.
In the technical scheme of the present invention, the two ends stretch-draw of described steel pipe is fixed, and mass is fixed on the elastic structure that the steel pipe pars intermedia is formed.Elastic structure is under the forced vibration effect; The strain of steel tube surface changes thereupon; The direction of vibration of the strain of diverse location and elastic structure is relevant with size on the steel tube surface circumference orientation, through the right wavelength difference of the fiber grating of combination in twos can the sensing different directions vibration acceleration.For ease of specifying the principle of work that the sensor three-dimensional acceleration detects, at first set up three-dimensional cartesian coordinate system: confirm as the Z axle with the steel pipe axis, X axle, Y axle are vertical with the Z axle, and it is consistent that Z-direction and fiber grating belong to direction.When elastic structure during along the vibration of X axle or Y direction; Be at the circumferential surface of steel pipe that corresponding two fiber gratings receive positive and negative effects of strain respectively simultaneously on X axle or the Y axle; The wavelength difference of the two is used for weighing the vibration acceleration of this direction, and is in the not variation of wavelength difference of two fiber gratings on Y axle or the X axle; When elastic structure when Z-direction is vibrated, the fiber grating of two symmetries consistent with Z-direction receives positive and negative effects of strain on steel pipe, the wavelength difference of the two is used for weighing the vibration acceleration of this direction, X axle and Y direction do not have strain variation.If elastic structure vibrates along any direction, the vector that can this vibration be decomposed into the vibration of three directions of X-Y-Z with, and detect respectively.Temperature variation causes that the change direction of grating wavelength is consistent, therefore, as detection signal, can eliminate influence of temperature variation with the wavelength difference of two fiber gratings.
The present invention has following technical advantage:
1, form the three dimension acceleration sensor of elastic structure and fiber grating composition with a steel pipe and mass, simple in structure;
2, with the wavelength difference of two fiber gratings as detection signal, have the temperature compensation ability.
The explanation of sensor one-piece construction
Accompanying drawing 2 is the mass axial view
Among the figure: 1---package header, 2---steel pipe, 3---mass, 4---a fiber grating, 5---No. two fiber gratings, 6---No. three fiber gratings, 7---No. four fiber gratings, 8---No. five fiber gratings, 9---optical cable output protection joint.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention and realization principle are further described.
The structure of three dimension acceleration sensor of the present invention is as shown in Figure 1, and sensor mainly is made up of steel pipe 2, mass 3, five fiber grating 4-8, package header 1 and optical cable output protection joints 9.Mass 3 is fixed in the steel pipe centre position with steel pipe 2 interference fit and with laser bonding.Steel pipe 2 two ends use laser bonding stretch-draw to be fixed on the U type groove of package header 1.One end of package header 1 leaves screw, is used for connecting optical cable output protection joint 9.Two ends optical fiber went out from optical cable output protection joint 9 after five fiber gratings were serially connected.
Five fiber grating distributing positions (combination Fig. 1); A fiber grating 4 and No. two fiber gratings 5 are pasted on the steel pipe upper and lower surfaces on the left of the mass respectively; No. four fiber gratings 7 and No. three fiber gratings 6 are pasted on former and later two sides of steel pipe on the left of the mass; No. five fiber gratings 8 are pasted on the steel tube surface on mass right side, and No. five fiber gratings 8 and No. four fiber grating 7 symmetries are pasted.Five fiber gratings are equal to the distance (about 2mm) of mass 3, to be eliminated cross interference after the wavelength generation difference that guarantees corresponding two fiber gratings.
The sensor three-dimensional measurement realizes that principle further specifies as follows: get λ
1, λ
2Be respectively the wavelength of fiber grating 4, No. two fiber gratings 5, Δ λ=λ
1-λ
2, when elastic structure vibrates along any direction, fiber grating 4, No. two fiber gratings 5 side direction (x direction), axially the wave length shift on (z direction) both direction in the same way and size identical, Δ λ=λ
1-λ
2Just eliminated this both direction and disturbed, Δ λ is along the output of the vibratory response on y direction signal.Same principle is got λ
3, λ
4, λ
5Be respectively the wavelength of No. three fiber gratings 6, No. four fiber gratings 7, No. five fiber gratings 8, then Δ λ '=λ
3-λ
4Be the measurement output signals of side direction (x direction), Δ λ "=λ
4-λ
5Be axial (z direction) measurement output signals.The wavelength of five gratings under temperature effect drifts about in the same way and after difference, is eliminated, and realizes the three-dimensional measurement of temperature self-compensation.
Claims (7)
1. the fiber-optic grating sensor that three-dimensional acceleration is measured is characterized in that sensor mainly is made up of steel pipe (2), mass (3), five fiber gratings, package header (1), optical cable output protection joints (9); Steel pipe (2) two ends stretch-draw is fixed on the package header (1); Mass (3) is fixed in steel pipe (2) centre position; Four fiber gratings stick on the maximum of steel pipe (2) surface strain of mass (3) one sides; Be distributed in the described steel pipe circumference in edge and be on the azimuthal position of 90 degree, the stickup direction is axial along steel pipe; Another fiber grating sticks on mass opposite side steel pipe (2) surface, and is symmetrical with the some gratings in preceding four gratings, and two ends optical fiber was drawn from optical cable output protection joint (9) after five fiber gratings were serially connected.
2. the fiber-optic grating sensor that a kind of three-dimensional acceleration according to claim 1 is measured is characterized in that: mass (3) is fixed in the steel pipe centre position with steel pipe (2) interference fit and with laser bonding.
3. the fiber-optic grating sensor that a kind of three-dimensional acceleration according to claim 1 is measured is characterized in that: steel pipe (2) two ends use laser bonding stretch-draw to be fixed on the U type groove of package header (1).
4. the fiber-optic grating sensor that a kind of three-dimensional acceleration according to claim 1 is measured, it is characterized in that: an end of package header (1) leaves screw, connects optical cable output protection joint (9).
5. the fiber-optic grating sensor of measuring according to the described a kind of three-dimensional acceleration of claim 1 is characterized in that: five gratings are equal to the distance of mass (3).
6. the fiber-optic grating sensor of measuring according to the described a kind of three-dimensional acceleration of claim 1 is characterized in that: five gratings are 2mm to the distance of mass (3).
7. the fiber-optic grating sensor of measuring according to the described a kind of three-dimensional acceleration of claim 1; It is characterized in that: five fiber grating distributing positions do; A fiber grating (4) and No. two fiber gratings (5) are pasted on steel pipe (2) upper and lower surfaces in mass (3) left side respectively; No. four fiber gratings (7) and No. three fiber gratings (6) are pasted on former and later two sides of steel pipe (2) in mass (3) left side; No. five fiber gratings (8) are pasted on steel pipe (2) surface on mass (3) right side, No. five fiber gratings (8) and No. four fiber gratings (7) symmetry.
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| CN2011103587023A CN102495235A (en) | 2011-11-14 | 2011-11-14 | Fiber bragg grating sensor for 3D acceleration measurement |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558416A (en) * | 2012-08-24 | 2014-02-05 | 李阔 | A method to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers |
| CN104483008A (en) * | 2014-12-09 | 2015-04-01 | 西安石油大学 | Fiber grating three-dimensional vibration sensor |
| CN105841796A (en) * | 2016-04-19 | 2016-08-10 | 西安石油大学 | Optical fiber grating three-dimensional vector vibration sensor |
| CN105974154A (en) * | 2016-06-14 | 2016-09-28 | 昆明理工大学 | High-frequency FBG acceleration sensor with stainless steel capillary and polymer sensitized structure and use method thereof |
| CN109387275A (en) * | 2017-08-04 | 2019-02-26 | 菲布雷格光电科技（湖北）有限公司 | Optical fibre grating acceleration sensor based on flexible hinge |
| CN109991443A (en) * | 2019-04-01 | 2019-07-09 | 东南大学 | A kind of high sensitivity temperature compensating type optical fibre grating acceleration sensor |
| CN110045149A (en) * | 2019-01-31 | 2019-07-23 | 哈工大机器人义乌人工智能研究院 | A kind of optical fibre grating acceleration sensor and acceleration detection method |
| CN110081839A (en) * | 2019-06-18 | 2019-08-02 | 武汉科技大学 | A kind of fiber grating wide range obliquity sensor of cam structure |
| CN110806258A (en) * | 2019-11-12 | 2020-02-18 | 山东省科学院激光研究所 | Three-component fiber grating vibration sensor |
| CN111397723A (en) * | 2020-04-27 | 2020-07-10 | 山东省科学院激光研究所 | Three-component optical fiber laser micro-vibration sensor with combined structure and application thereof |
| WO2020206836A1 (en) * | 2019-04-12 | 2020-10-15 | 山东科技大学 | Conical optical fiber acceleration sensor system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558416B (en) * | 2012-08-24 | 2016-08-17 | 李阔 | A kind of method of strain utilizing cross force to change rope and its application in fiber grating accelerometer |
| CN103558416A (en) * | 2012-08-24 | 2014-02-05 | 李阔 | A method to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers |
| CN104483008A (en) * | 2014-12-09 | 2015-04-01 | 西安石油大学 | Fiber grating three-dimensional vibration sensor |
| CN104483008B (en) * | 2014-12-09 | 2017-11-03 | 西安石油大学 | A kind of optical fibre grating three-dimensional vibrating sensor |
| CN105841796A (en) * | 2016-04-19 | 2016-08-10 | 西安石油大学 | Optical fiber grating three-dimensional vector vibration sensor |
| CN105841796B (en) * | 2016-04-19 | 2018-12-14 | 西安石油大学 | A kind of optical fibre grating three-dimensional vector vibration transducer |
| CN105974154A (en) * | 2016-06-14 | 2016-09-28 | 昆明理工大学 | High-frequency FBG acceleration sensor with stainless steel capillary and polymer sensitized structure and use method thereof |
| CN109387275A (en) * | 2017-08-04 | 2019-02-26 | 菲布雷格光电科技（湖北）有限公司 | Optical fibre grating acceleration sensor based on flexible hinge |
| CN110045149A (en) * | 2019-01-31 | 2019-07-23 | 哈工大机器人义乌人工智能研究院 | A kind of optical fibre grating acceleration sensor and acceleration detection method |
| CN109991443A (en) * | 2019-04-01 | 2019-07-09 | 东南大学 | A kind of high sensitivity temperature compensating type optical fibre grating acceleration sensor |
| WO2020206836A1 (en) * | 2019-04-12 | 2020-10-15 | 山东科技大学 | Conical optical fiber acceleration sensor system |
| CN110081839A (en) * | 2019-06-18 | 2019-08-02 | 武汉科技大学 | A kind of fiber grating wide range obliquity sensor of cam structure |
| CN110081839B (en) * | 2019-06-18 | 2024-02-20 | 武汉科技大学 | Fiber bragg grating wide-range inclination sensor with cam structure |
| CN110806258A (en) * | 2019-11-12 | 2020-02-18 | 山东省科学院激光研究所 | Three-component fiber grating vibration sensor |
| CN110806258B (en) * | 2019-11-12 | 2022-06-28 | 山东省科学院激光研究所 | Three-component fiber grating vibration sensor |
| CN111397723A (en) * | 2020-04-27 | 2020-07-10 | 山东省科学院激光研究所 | Three-component optical fiber laser micro-vibration sensor with combined structure and application thereof |
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Application publication date: 20120613 |