CN206208380U - A kind of optical fiber raster vibration sensor based on cantilever beam structure - Google Patents
A kind of optical fiber raster vibration sensor based on cantilever beam structure Download PDFInfo
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- CN206208380U CN206208380U CN201621261659.3U CN201621261659U CN206208380U CN 206208380 U CN206208380 U CN 206208380U CN 201621261659 U CN201621261659 U CN 201621261659U CN 206208380 U CN206208380 U CN 206208380U
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- cantilever beam
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Abstract
The utility model discloses a kind of optical fiber raster vibration sensor based on cantilever beam structure, by base, cantilever beam, screw, first FBG fiber gratings, 2nd FBG fiber gratings, three-dB coupler, spectrometer, ASE light sources, adhesive etc. is constituted, and cantilever beam one end is fixed on base, and fiber grating is pasted onto cantilever beam two surface symmetrical above and below.When vibration is measured, base is fixed on vibration source, cantilever beam can simultaneously vibrate with vibration source, cantilever beam can deform upon the elongation of drive fiber grating and shrink under force, so as to cause the change of its bragg reflection wavelength, the measurement of vibration is capable of achieving by the knots modification for measuring bragg wavelength, and two gratings for passing through symmetric position bragg wavelength movement in the same direction and the constant influence for almost eliminating temperature of relative position, the invention not only simple structure, and fiber grating sensitivity is high, do not receive electromagnetic interference, low cost, with very strong novelty and practical value, there is good application prospect.
Description
Technical field
A kind of technical field the invention belongs to measure vibration, and in particular to optical fiber raster vibration based on cantilever beam structure
Sensor.
Background technology
Fiber grating is the one kind for growing up the nineties in 20th century in optical-fibre communications, Fibre Optical Sensor and optical information processing neck
The basic optical fibre device of domain extensive application prospect.
Fiber grating sensing technology has turned into an important research direction of modern sensory field, and it is in vibrating sensing field
Application also achieve certain achievement.Fiber-optic grating sensor is mainly used in the Gernral Check-up of the heavy construction structure such as bridge
With the fault diagnosis system of various machineries.
Optical fiber raster vibration sensor based on cantilever beam structure, the invention not only simple structure, and one can be passed through
Fiber grating can be achieved with measurement and the temperature-insensitive of vibration, so as to save cost, with very strong novelty and practicality
Value, there is good application prospect.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to fiber grating is pasted onto into the upper of cantilever beam symmetric position
Lower two surfaces, when vibration is measured, cantilever beam can simultaneously be vibrated with vibration source, and optical fiber is caused so as to cause optical fiber to deform upon
The change of grating Bragg wavelength, the measurement to vibrating is realized by measuring the knots modification of bragg wavelength.
The present invention is achieved through the following technical solutions：Optical fiber raster vibration sensor based on cantilever beam structure, by base
(1), cantilever beam (2), screw (3), a FBG fiber gratings (4), the 2nd FBG fiber gratings (5), three-dB coupler (6), spectrum
Instrument (7), ASE light sources (8) composition；Cantilever beam (2) is fixed by screw (3) and base (1), a FBG fiber gratings (4) and the
Two FBG fiber gratings (5) are pasted onto the upper surface of cantilever beam (2) and the lower surface of symmetric position, spectrometer (7) by adhesive
It is connected with optical fiber by three-dB coupler (6) respectively with ASE light sources (8).When vibration is measured, base is fixed on vibration source,
Cantilever beam can simultaneously vibrate with vibration source, and cantilever beam can deform upon the elongation of drive fiber grating and receive under force
Contracting, so as to cause the change of its bragg reflection wavelength.If vibration is simple harmonic oscillation, the cycle of bragg wavelength can be caused
Property change, the measurement of vibration is capable of achieving by measuring the knots modification of bragg wavelength.Influence main source of the temperature to grating
The drift of fiber grating reflection wavelength, two light that the present invention passes through symmetric position caused by the metal cantilever beams swollen shrinkage of heat
Grid, metal heat-conducting is fast, and copper cantilever beam bulk temperature is consistent, and two gratings can be made to be always under identical temperature environment, when
During temperature change, the bragg wavelength movement in the same direction of two gratings and relative position is constant, so as to ensure that two fiber gratings
Wave spectrum location matches, almost eliminate the influence of temperature, and the sensitivity of vibrating sensor can be improved.
Described cantilever beam (2) uses isosceles structure design.
The material of described cantilever beam (2) is metal copper foil, and beam length is 100mm, and fixing end width is 30mm, and thickness is
2mm。
A described FBG fiber gratings (4) and the centre wavelength of the second fiber grating (5) are respectively 1550nm,
1570nm。
Operation principle of the invention is：For equi intensity cantilever, the width of cantilever beam is along length L0It is change, it is fixed
End width is b, and thickness is h, and top view cross section is isosceles triangle, and cross section is rectangle.Other load are not applied on cantilever beam, only
With its deadweight as load.
The Deflection Differential Equation of equal strength cantilever fine strain of millet structure is：
In formula (1), ω (x) is that M (x) is the moment of flexure at this, E apart from being the amount of deflection at z location on beam relative to fixing end
It is the elastic modelling quantity of material, IzX () is the moment of inertia of position centering axle z, m is cantilever beam quality, and g is acceleration of gravity.
The solution differential equation simultaneously can obtain deflection formula using boundary condition ω (0)=0 and ω ' (0)=0：
Barycenter without extra load equal strength fine strain of millet at fixing end, then the expression formula of resonant frequency：
According to the emergent property of mechanics of materials moderate strength beam, the strain stress of cantilever beam upper surface and beam end amount of deflection ω
(L0) relation be：
The relative drift value of grating Bragg centre wavelength that rigidity is pasted on cantilever beam is with the relation for straining：
ΔλBThe relative drift value of grating Bragg centre wavelength, KTAnd KtRespectively the strain sensitivity of fiber grating and
Temperature control.So deformation is produced when cantilever beam (2) is measured and vibrated, due to a FBG fiber gratings (4) and the 2nd FBG
Fiber grating (5) is rigidly pasted onto two surface up and down of the symmetric position of cantilever beam (2) respectively so that when the cantilever beam vibration time-division
The tensile and compressible strain of same degree is not experienced, causes both bragg wavelengths to there is a reverse knots modification, accomplish
Temperature-compensating.If vibration is simple harmonic oscillation, the cyclically-varying of bragg wavelength can be caused, by measuring bragg wavelength
Knots modification be capable of achieving vibration measurement.
The beneficial effects of the invention are as follows：Beam in design of the invention in cantilever beam structure sensor we use isosceles knot
Structure is designed, and fiber grating is pasted onto the upper surface of beam and symmetrical lower surface respectively, and cantilever beam will due to the vibration of vibration source
Can deform upon, its surface is rigidly pasted onto due to fiber grating, can together be deformed upon with beam, based on the spy that we design
The cantilever beam of different structure so that two fiber gratings are experienced the stretching of same degree and compressed and answer respectively when cantilever beam vibration
Become, when the temperature is changed, the bragg wavelength movement in the same direction of two gratings and relative position is constant, so as to ensure that two optical fiber
The wave spectrum location matches of grating, almost eliminate the influence of temperature, and can improve the sensitivity of vibrating sensor, with very
Strong novelty and practical value, there is good application prospect.
Brief description of the drawings
Fig. 1 is the optical fiber raster vibration sensor structural representation based on cantilever beam structure.
Specific embodiment
As shown in figure 1, by base (1), cantilever beam (2), screw (3), a FBG fiber gratings (4), the 2nd FBG optical fiber
Grating (5), three-dB coupler (6), spectrometer (7), ASE light sources (8) composition；Cantilever beam (2) is solid by screw (3) and base (1)
It is fixed, a FBG fiber gratings (4) and the 2nd FBG fiber gratings (5) by adhesive be pasted onto the upper surface of cantilever beam (2) with
The lower surface of symmetric position, spectrometer (7) and ASE light sources (8) are connected by three-dB coupler (6) with optical fiber respectively.It is of the invention
Operation principle is：Base is fixed on vibration source, cantilever beam can simultaneously vibrate with vibration source, cantilever beam meeting under force
Deform upon the elongation of drive fiber grating and shrink, so as to cause the change of its bragg reflection wavelength.By measuring Prague
The knots modification of wavelength is the measurement for being capable of achieving vibration.The cantilever beam of the special construction designed based on us so that when cantilever beam shakes
Two fiber gratings experience the tensile and compressible strain of same degree, when the temperature is changed, two Bradleys of grating respectively when dynamic
Lattice wave movement in the same direction long and relative position is constant, so as to ensure that two wave spectrum location matches of fiber grating, almost eliminate
The influence of temperature, and the sensitivity of vibrating sensor can be improved.
Claims (3)
1. the optical fiber raster vibration sensor of cantilever beam structure is based on, by base (1), cantilever beam (2), screw (3), a FBG
Fiber grating (4), the 2nd FBG fiber gratings (5), three-dB coupler (6), spectrometer (7), ASE light sources (8) composition；Cantilever beam
(2) fixed by screw (3) and base (1), a FBG fiber gratings (4) and the 2nd FBG fiber gratings (5) are by adhesive
The upper surface of cantilever beam (2) and the lower surface of symmetric position are pasted onto, spectrometer (7) and ASE light sources (8) pass through 3dB couplings respectively
Clutch (6) is connected with optical fiber.
2. the optical fiber raster vibration sensor based on cantilever beam structure according to claim 1, it is characterised in that：Described
The material of cantilever beam (2) is metal copper foil, and beam length is 100mm, and fixing end width is 30mm, and thickness is 2mm.
3. the optical fiber raster vibration sensor based on cantilever beam structure according to claim 1, it is characterised in that：Described
The centre wavelength of the first FBG fiber gratings (4) and the 2nd FBG fiber gratings (5) is respectively 1550nm, 1570nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621261659.3U CN206208380U (en) | 2016-11-18 | 2016-11-18 | A kind of optical fiber raster vibration sensor based on cantilever beam structure |
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| CN201621261659.3U CN206208380U (en) | 2016-11-18 | 2016-11-18 | A kind of optical fiber raster vibration sensor based on cantilever beam structure |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504988A (en) * | 2017-10-09 | 2017-12-22 | 曲阜师范大学 | Optical fiber optical grating sensing experiment system based on compound girder construction |
| CN107621328A (en) * | 2017-09-07 | 2018-01-23 | 南京溯极源电子科技有限公司 | A kind of atmospheric pressure measurement apparatus and method |
| CN107907205A (en) * | 2017-10-30 | 2018-04-13 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave vibrating sensor |
| 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 |
| CN109307482A (en) * | 2018-12-05 | 2019-02-05 | 重庆大学 | The optical fiber Shape Reconstruction system of temperature-insensitive |
| CN109520610A (en) * | 2018-12-27 | 2019-03-26 | 国网宁夏电力有限公司电力科学研究院 | A kind of adjustable optical fiber raster vibration sensor of frequency |
| CN111322966A (en) * | 2020-03-23 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber Bragg grating tilt angle sensor based on two equal-strength double-arm beams |
| CN111504220A (en) * | 2020-05-01 | 2020-08-07 | 西安交通大学 | Fiber grating temperature/vibration/strain composite sensor and working method thereof |
| CN111596345A (en) * | 2020-06-17 | 2020-08-28 | 防灾科技学院 | Optical fiber acceleration sensor for earthquake monitoring and preparation method thereof |
| CN111665375A (en) * | 2020-06-28 | 2020-09-15 | 深圳市繁华物创科技有限公司 | Atomic force microscope probe and system based on waveguide Bragg grating |
| CN111879970A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Temperature insensitive FBG acceleration sensor and method based on strain chirp effect |
| CN112304469A (en) * | 2019-12-10 | 2021-02-02 | 中国科学院合肥物质科学研究院 | FBG temperature sensor based on bimetal cantilever beam and application thereof |
| CN113080931A (en) * | 2021-03-10 | 2021-07-09 | 杭州澳芯科技有限公司 | BCG-based non-contact respiration monitoring method and system |
| CN113624324A (en) * | 2021-08-09 | 2021-11-09 | 西安石油大学 | Hollow triangle beam type fiber grating vibration sensor |
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- 2016-11-18 CN CN201621261659.3U patent/CN206208380U/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107621328A (en) * | 2017-09-07 | 2018-01-23 | 南京溯极源电子科技有限公司 | A kind of atmospheric pressure measurement apparatus and method |
| CN107504988A (en) * | 2017-10-09 | 2017-12-22 | 曲阜师范大学 | Optical fiber optical grating sensing experiment system based on compound girder construction |
| CN107504988B (en) * | 2017-10-09 | 2023-06-06 | 曲阜师范大学 | Fiber bragg grating sensing experiment system based on composite beam structure |
| CN107907205A (en) * | 2017-10-30 | 2018-04-13 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave vibrating sensor |
| 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 |
| CN109307482A (en) * | 2018-12-05 | 2019-02-05 | 重庆大学 | The optical fiber Shape Reconstruction system of temperature-insensitive |
| CN109520610A (en) * | 2018-12-27 | 2019-03-26 | 国网宁夏电力有限公司电力科学研究院 | A kind of adjustable optical fiber raster vibration sensor of frequency |
| CN112304469A (en) * | 2019-12-10 | 2021-02-02 | 中国科学院合肥物质科学研究院 | FBG temperature sensor based on bimetal cantilever beam and application thereof |
| CN111322966A (en) * | 2020-03-23 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber Bragg grating tilt angle sensor based on two equal-strength double-arm beams |
| CN111322966B (en) * | 2020-03-23 | 2021-12-07 | 贵州江源电力建设有限公司 | Optical fiber Bragg grating inclination angle sensor for two equal-strength double-arm beams of electric pole |
| CN111504220A (en) * | 2020-05-01 | 2020-08-07 | 西安交通大学 | Fiber grating temperature/vibration/strain composite sensor and working method thereof |
| CN111596345A (en) * | 2020-06-17 | 2020-08-28 | 防灾科技学院 | Optical fiber acceleration sensor for earthquake monitoring and preparation method thereof |
| CN111596345B (en) * | 2020-06-17 | 2023-12-29 | 防灾科技学院 | Optical fiber acceleration sensor for earthquake monitoring and preparation method thereof |
| CN111665375A (en) * | 2020-06-28 | 2020-09-15 | 深圳市繁华物创科技有限公司 | Atomic force microscope probe and system based on waveguide Bragg grating |
| CN111879970A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Temperature insensitive FBG acceleration sensor and method based on strain chirp effect |
| CN113080931A (en) * | 2021-03-10 | 2021-07-09 | 杭州澳芯科技有限公司 | BCG-based non-contact respiration monitoring method and system |
| CN113624324A (en) * | 2021-08-09 | 2021-11-09 | 西安石油大学 | Hollow triangle beam type fiber grating vibration sensor |
| CN113624324B (en) * | 2021-08-09 | 2023-10-13 | 西安石油大学 | Hollow triangle beam type fiber bragg grating vibration sensor |
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Granted publication date: 20170531 Termination date: 20191118 |