CN107314808A - A kind of two-dimension vibration sensor based on twisted fiber grating - Google Patents
A kind of two-dimension vibration sensor based on twisted fiber grating Download PDFInfo
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- CN107314808A CN107314808A CN201710696025.3A CN201710696025A CN107314808A CN 107314808 A CN107314808 A CN 107314808A CN 201710696025 A CN201710696025 A CN 201710696025A CN 107314808 A CN107314808 A CN 107314808A
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- torsion bar
- pedestal
- fiber grating
- vibration sensor
- fixed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The present invention relates to a kind of two-dimension vibration sensor based on twisted fiber grating, including the pedestal for being fixed on testee, two bearing blocks are installed on pedestal, two bearing blocks are respectively cooperating with a pair of parallel torsion bar by bearing, one end of two torsion bars is fixed on pedestal, the other end stretches out bearing block, two torsion bars correspond to two LPFGs respectively, LPFG is separately fixed on the external part of correspondence torsion bar and pedestal and concentric with corresponding torsion bar, tail optical fiber is drawn by the through hole on pedestal, the mass perpendicular to torsion bar and level is provided with the external part of one torsion bar, it is provided with the external part of another torsion bar perpendicular to torsion bar and vertical mass.The sensor obtains measurement signal using LPFG torque characteristic, improves sensitivity and measurement accuracy.
Description
Technical field
The invention belongs to vibration measurement field, and in particular to a kind of two-dimension vibration sensor based on twisted fiber grating.
Background technology
In recent years, fiber-optic grating sensor is with light and handy safety, and anti-electromagnetic interference capability is strong, and the advantage such as corrosion-and high-temp-resistant is obtained
Obtain and rapidly develop.The common main two categories below of fiber grating two-dimensional vibration acceleration sensor at present, one be using diaphragm,
The structure such as flexure strip or spring bears the external force that acceleration is brought, and measures the strain of elastic construction to measure by fiber grating
Acceleration, two be, as the elastomer for bearing the inertia force caused by acceleration, to pass through grating wavelength directly using fiber grating
Drift value obtains acceleration magnitude.The stress morphology of fiber grating is generally tension in this two type optical fibers grating acceleration transducer
Stretch or compress.
The acceleration synthetic method that most of fiber grating two-dimensional vibrating sensors pass through two vertical measurement directions
To obtain on two dimension acceleration, but two measurement directions of many sensors, sensitivity is different, this can cause it is synthesized total plus
Speed is not accurate enough.
The content of the invention
It is an object of the invention to provide a kind of two-dimension vibration sensor based on twisted fiber grating, the sensor utilizes length
Period optical fiber grating torque characteristic obtains measurement signal, improves sensitivity and measurement accuracy.
The technical solution adopted in the present invention is：
A kind of two-dimension vibration sensor based on twisted fiber grating, including the pedestal for being fixed on testee,
Two bearing blocks are installed, two bearing blocks are respectively cooperating with a pair of parallel torsion bar by bearing on pedestal, two torsion bars
One end is fixed on pedestal, the other end stretches out bearing block, and two torsion bars correspond to two LPFGs, long period light respectively
Fine grating is separately fixed on the external part of correspondence torsion bar and pedestal and, through hole that tail optical fiber pass through pedestal on concentric with corresponding torsion bar
Draw, be provided with and be provided with torsion bar and the mass of level, the external part of another torsion bar at the external part of a torsion bar
Perpendicular to torsion bar and vertical mass.
Further, mass is cylindrical.
Further, mass is fixed on clamping ring by connecting rod, and clamping ring is fixedly clamped in the external part of torsion bar.
Further, the two ends of connecting rod are connected with mass and clamping ring respectively by screw thread.
Further, optical fiber fixing groove is equipped with the external part end face of torsion bar and on pedestal, LPFG leads to
Glue is crossed to be fixed on optical fiber fixing groove.
Further, torsion bar is round straight bar.
Further, the fixing end of torsion bar is provided with torsion bar base, and torsion bar base is fixed by screws on pedestal.
Further, bearing block is fixed by screws on pedestal.
Further, bearing is rolling bearing.
The beneficial effects of the invention are as follows：
Base level is fixed on testee, when the vibration on perpendicular occurs for testee, due to inertia,
Mass produces torque and moment of flexure to torsion bar, and the bearing of torsion bar end limits action effect of the moment of flexure to torsion bar, and torsion bar is only sent out
Raw obvious torsional deflection, and cause LPFG to occur identical torsion, pass through the drift value of optic fiber grating wavelength
With the relation of the relation of fiber grating torsion rate, and vibration acceleration and torsion bar torsion angle, optic fiber grating wavelength can obtain
Thus drift value can obtain the vibration of testee with the relation of vibration acceleration by measuring optic fiber grating wavelength drift value
Amount.The grating form tension or in compression of present invention fiber-optic grating sensor different from the past, but utilize LPFG
Torque characteristic obtains measurement signal, improves sensitivity, the sensitivity of two measurement directions is identical, can guarantee that by vector rule
The acceleration of synthesis is more accurate, improves the precision of measurement.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the structural representation of torsion bar in the embodiment of the present invention.
Fig. 3 is the structural representation of inertial mechanism (clamping ring, connecting rod and mass) in the embodiment of the present invention.
In figure：1- pedestals；2- soket head cap screws；3- torsion bars；4- attachment screws；5- bearing blocks；6- clamping rings；7- connections
Bar；8- masses；9- glue；10- LPFGs；3-1. torsion bar bases；3-2. screw hole；3-3. round straight bar；3-4.
Optical fiber fixing groove.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is further illustrated.
As shown in figure 1, a kind of two-dimension vibration sensor based on twisted fiber grating, including for being fixed on testee
On pedestal 1, two bearing blocks 5 are installed on pedestal 1, two bearing blocks 5 are respectively cooperating with a pair of parallel torsion by bearing
Bar 3, one end of two torsion bars 3 is fixed on pedestal 1, the other end stretches out bearing block 5, and two torsion bars 3 correspond to two long weeks respectively
Phase fiber grating 10, LPFG 10 be separately fixed at correspondence torsion bar 3 external part and pedestal 1 on and with corresponding torsion bar
3 with one heart, and tail optical fiber is drawn by the through hole on pedestal 1, and the matter perpendicular to torsion bar 3 and level is provided with the external part of a torsion bar 3
It is provided with gauge block 8, the external part of another torsion bar 3 perpendicular to torsion bar 3 and vertical mass 8.
Pedestal 1 is horizontally fixed on testee, when the vibration on perpendicular occurs for testee, due to used
Property, mass 8 limits action effect of the moment of flexure to torsion bar 3 to the generation torque of torsion bar 3 and moment of flexure, the bearing of the end of torsion bar 3, turned round
Obvious torsional deflection occurs for 3, bar, and causes LPFG 10 to occur identical torsion, passes through optic fiber grating wavelength
Drift value and fiber grating torsion rate relation, and vibration acceleration and the torsion angle of torsion bar 3 relation, can obtain optical fiber light
Thus the drift value of lattice wave length can obtain measured object with the relation of vibration acceleration by measuring optic fiber grating wavelength drift value
The vibratory output of body.The grating form tension or in compression of present invention fiber-optic grating sensor different from the past, but utilize long period
The torque characteristic of fiber grating 10 obtains measurement signal, improves sensitivity, the sensitivity of two measurement directions is identical, can guarantee that
The acceleration synthesized by vector rule is more accurate, improves the precision of measurement.
As shown in figures 1 and 3, in the present embodiment, mass 8 is cylindrical.
As shown in figures 1 and 3, in the present embodiment, mass 8 is fixed on clamping ring 6 by connecting rod 7, clamping ring 6
It is fixedly clamped in the external part of torsion bar 3.The two ends of connecting rod 7 are connected with mass 8 and clamping ring 6 respectively by screw thread.
As depicted in figs. 1 and 2, in the present embodiment, optical fiber is equipped with the external part end face of torsion bar 3 and on pedestal 1 to consolidate
Determine groove 3-4, LPFG 10 is fixed on optical fiber fixing groove 3-4 by glue 9.
As shown in Fig. 2 in the present embodiment, torsion bar 3 is round straight bar 3-3.
As depicted in figs. 1 and 2, in the present embodiment, the fixing end of torsion bar 3 is provided with torsion bar base 3-1, torsion bar base 3-1
It is fixed on by screw 2 on pedestal 1.
As shown in figure 1, in the present embodiment, bearing block 5 is fixed by screws on pedestal 1.Bearing is rolling bearing.
The operation principle of the embodiment of the present invention is：
Sensor device is arranged on testee, when there is the vibration along horizontal inertial device direction, vertical
Mass 8 is by inertia force F：
F=ma (1)
Wherein, the vibration acceleration that m is the quality of mass 8, a is testee.
The torque T that torsion bar 3 is subject to is：
T=Fd=mad (2)
Wherein, d is distance of the center of gravity of mass 8 to the axis of torsion bar 3.
In the presence of moment of torsion, the torsion bar 3 being engaged with vertical mass 8 twists deformation, torsion angleFor：
Wherein, L is the length of torsion bar 3, and G is the shear modulus of the material of torsion bar 3, IpThe center of circle is faced for the rounded cross section of torsion bar 3
Polar moment of inertia, also,
D is the diameter of torsion bar 3. (4)
#1LPG (fiber grating, similarly hereinafter) generation torsional deflection under the driving of torsion bar 3 of the end of torsion bar 3 is fixed on,
Torsion angle is equal with the torsion angle of the end of torsion bar 3, then #1LPG torsion rate τ is：
Wherein, l is the fiber lengths between two optical fiber fixing points.
According to the torque characteristic of LPFG 10, wavelength shift Δ λ and the torsion rate of fiber grating have good
Good linear relationship, i.e.,
Δ λ=k τ (6)
Wherein, k is the torsion sensitivity of fiber grating, is the dispersion factor and optical fiber parameter with LPFG 10
Relevant constant.
Simultaneous (2) (3) (5) (6) can be obtained
For the mass 8 of level, when along during the vibration of vertical mass 8, the mass 8 of level is not due to weight
Power is acted on, and moment of torsion mgd is produced to torsion bar 3, with derivation above, it is known that, #2LPG (No. two fiber gratings, similarly hereinafter) is relative
It is in the wavelength shift of initial wavelength：
When existing along during the vibration of vertical mass 8, the mass 8 of level is mg+ma to the moment of torsion of torsion bar 3, this
When, #2LPG is relative to the wavelength shift of initial wavelength：
#2LPG wavelength shift is as caused by the vibration along vertical mass 8：
Contrast (7) (10) and understand that sensitivity is identical on two vibration measurement directions of sensor.According to (7)
(10) measurement to vibration acceleration can be realized by optic fiber grating wavelength drift value.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of two-dimension vibration sensor based on twisted fiber grating, it is characterised in that：Including for being fixed on testee
On pedestal, two bearing blocks are installed on pedestal, two bearing blocks are respectively cooperating with a pair of parallel torsion bar, two by bearing
One end of individual torsion bar is fixed on pedestal, the other end stretches out bearing block, and two torsion bars correspond to two LPFGs respectively,
LPFG be separately fixed at correspondence torsion bar external part and pedestal on and it is concentric with corresponding torsion bar, tail optical fiber passes through pedestal
On through hole draw, the stretching perpendicular to torsion bar and the mass, another torsion bar of level is provided with the external part of a torsion bar
It is provided with end perpendicular to torsion bar and vertical mass.
2. the two-dimension vibration sensor as claimed in claim 1 based on twisted fiber grating, it is characterised in that：Mass is in post
Shape.
3. the two-dimension vibration sensor as claimed in claim 1 or 2 based on twisted fiber grating, it is characterised in that：Mass
It is fixed on by connecting rod on clamping ring, clamping ring is fixedly clamped in the external part of torsion bar.
4. the two-dimension vibration sensor as claimed in claim 3 based on twisted fiber grating, it is characterised in that：The two of connecting rod
End is connected with mass and clamping ring respectively by screw thread.
5. the two-dimension vibration sensor as claimed in claim 1 based on twisted fiber grating, it is characterised in that：The stretching of torsion bar
Optical fiber fixing groove is equipped with the end face of end and on pedestal, LPFG is fixed on optical fiber fixing groove by glue.
6. the two-dimension vibration sensor as claimed in claim 1 based on twisted fiber grating, it is characterised in that：Torsion bar is straight to wait
Round bar.
7. the two-dimension vibration sensor based on twisted fiber grating as described in claim 1 or 6, it is characterised in that：Torsion bar
Fixing end is provided with torsion bar base, and torsion bar base is fixed by screws on pedestal.
8. the two-dimension vibration sensor as claimed in claim 1 based on twisted fiber grating, it is characterised in that：Bearing block passes through
Screw is fixed on pedestal.
9. the two-dimension vibration sensor as claimed in claim 1 based on twisted fiber grating, it is characterised in that：Bearing is rolling
Bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696025.3A CN107314808B (en) | 2017-08-14 | 2017-08-14 | Two-dimensional vibration sensor based on torsion fiber bragg grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696025.3A CN107314808B (en) | 2017-08-14 | 2017-08-14 | Two-dimensional vibration sensor based on torsion fiber bragg grating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107314808A true CN107314808A (en) | 2017-11-03 |
| CN107314808B CN107314808B (en) | 2020-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710696025.3A Expired - Fee Related CN107314808B (en) | 2017-08-14 | 2017-08-14 | Two-dimensional vibration sensor based on torsion fiber bragg grating |
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Citations (8)
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|---|---|---|---|---|
| GB972826A (en) * | 1960-07-28 | 1964-10-14 | Boelkow Ludwig | Accelerometer |
| US3559492A (en) * | 1967-01-30 | 1971-02-02 | Litton Systems Inc | Two-axes angular rate and linear acceleration multisensor |
| CN1477371A (en) * | 2003-07-09 | 2004-02-25 | 重庆大学 | Tortion absolute measurement method based on long-period optical fibre grating and its equipment |
| US20050132803A1 (en) * | 2003-12-23 | 2005-06-23 | Baldwin David J. | Low cost integrated MEMS hybrid |
| CN101191751A (en) * | 2007-12-13 | 2008-06-04 | 北京理工大学 | Torque optical fiber sensor |
| CN101210937A (en) * | 2007-12-21 | 2008-07-02 | 南开大学 | Optical fibre grating three-dimensional acceleration /vibration sensor |
| CN102602875A (en) * | 2011-01-24 | 2012-07-25 | 飞思卡尔半导体公司 | Mems sensor with folded torsion springs |
| US20150260751A1 (en) * | 2014-03-14 | 2015-09-17 | Samsung Electro-Mechanics Co., Ltd. | Detector module for mems sensor and mems sensor having the same |
-
2017
- 2017-08-14 CN CN201710696025.3A patent/CN107314808B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB972826A (en) * | 1960-07-28 | 1964-10-14 | Boelkow Ludwig | Accelerometer |
| US3559492A (en) * | 1967-01-30 | 1971-02-02 | Litton Systems Inc | Two-axes angular rate and linear acceleration multisensor |
| CN1477371A (en) * | 2003-07-09 | 2004-02-25 | 重庆大学 | Tortion absolute measurement method based on long-period optical fibre grating and its equipment |
| US20050132803A1 (en) * | 2003-12-23 | 2005-06-23 | Baldwin David J. | Low cost integrated MEMS hybrid |
| CN101191751A (en) * | 2007-12-13 | 2008-06-04 | 北京理工大学 | Torque optical fiber sensor |
| CN101210937A (en) * | 2007-12-21 | 2008-07-02 | 南开大学 | Optical fibre grating three-dimensional acceleration /vibration sensor |
| CN102602875A (en) * | 2011-01-24 | 2012-07-25 | 飞思卡尔半导体公司 | Mems sensor with folded torsion springs |
| US20150260751A1 (en) * | 2014-03-14 | 2015-09-17 | Samsung Electro-Mechanics Co., Ltd. | Detector module for mems sensor and mems sensor having the same |
Non-Patent Citations (2)
| Title |
|---|
| 张毅翔等: "扭转式光纤光栅加速度计的研究", 《计测技术》 * |
| 郭永兴等: "光纤光栅二维加速度传感器", 《中国激光》 * |
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| CN107314808B (en) | 2020-05-05 |
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