CN106814216A - The round flexible hinge optical fibre grating acceleration sensor of Integral direct - Google Patents
The round flexible hinge optical fibre grating acceleration sensor of Integral direct Download PDFInfo
- Publication number
- CN106814216A CN106814216A CN201710054036.1A CN201710054036A CN106814216A CN 106814216 A CN106814216 A CN 106814216A CN 201710054036 A CN201710054036 A CN 201710054036A CN 106814216 A CN106814216 A CN 106814216A
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- flexible hinge
- inertial mass
- optical fiber
- pedestal
- acceleration sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
- G01P15/032—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means by measuring the displacement of a movable inertial mass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses the round flexible hinge optical fibre grating acceleration sensor of Integral direct, constituted including sensor core and optical fiber, sensor core is by pedestal, two flexible hinges and two inertial mass are constituted, two inertial mass and two flexible hinges are symmetrically distributed in sensor core both sides, inertial mass is connected by flexible hinge with pedestal, optical fiber groove is arranged at two inertial mass tops, optical fiber passes through two optical fiber grooves of inertial mass, from the hole of both sides housing out, optical fiber is provided with fiber grating in the middle of two inertial mass, flexible hinge is straight round flexible hinge, there is relative displacement around flexible hinge in two inertial mass, so that fiber grating produces strain.The present invention is integrated, and small volume is easy to encapsulation, and simple structure reduces the encapsulation volume and packaging process of sensor, and with frequency measurement scope higher, integral structure increases the resonant frequency of sensor, improves the sensitivity of sensor.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, and in particular to the round flexible hinge optical fibre grating acceleration of Integral direct
Sensor.
Background technology
Optical fibre grating acceleration sensor is the drift that extraneous acceleration signal is converted to optic fiber grating wavelength, is passed through
The drift value of detection fiber raster center wavelength realizes the measurement to acceleration, and optical fibre grating acceleration sensor can be realized adding
The distributed measurement of rate signal, is not only able to electromagnetism interference compared with traditional sensors, and with explosion-proof, the resistance to height of essence
The advantages of temperature can work in the presence of a harsh environment, is widely used in the multiple fields such as Large-Scale Equipment, Aero-Space.
Existing sensor disclosure satisfy that engineering survey is used substantially within 1000Hz, and can meet in more than 1000Hz frequencies
The precision of the optical fibre grating acceleration sensor measured in the range of rate is too low, it is difficult to meet the measurement of high band acceleration signal,
And volume and weight is often excessive after encapsulation, it is impossible to apply in the field strict to volume and weight requirement such as space flight and aviation.
The acceleration transducer that Patent No. ZL200510019733.0 is previously mentioned, using cantilever beam structure, measurement frequency scope is small, very
Hardly possible realizes the acceleration signal measurement to high frequency.What Patent No. 200410232241.9 was previously mentioned is added based on flexible hinge high frequency
Velocity sensor sensor outer housing and core body are separated, and two flexible hinges for using are analogous to a straight round flexible hinge
Therefrom it is divided into two, using sunk screw by sensor core and cage connection, a large amount of spaces are left in inside, cause encapsulation volume
It is excessive.
The content of the invention
The technical problem to be solved in the present invention is, in view of the foregoing defects the prior art has, there is provided Integral direct is justified
Type flexible hinge optical fibre grating acceleration sensor, the present invention is integrated, and small volume is easy to encapsulation, simple structure, pole
The big encapsulation volume and packaging process that save space, reduce sensor, long-term reliability is high, is surveyed with frequency higher
Amount scope, integral structure increases the resonant frequency of sensor, improves the sensitivity of sensor.
The present invention is for the solution technical scheme that is used of above-mentioned technical problem：
A kind of round flexible hinge optical fibre grating acceleration sensor of Integral direct, including sensor core and optical fiber, pass
Sensor core body includes pedestal, two flexible hinges and two inertial mass, two flexible hinges and two inertial mass pair
Title is distributed in the both sides in pedestal, and inertial mass is connected by flexible hinge with pedestal, and inertial mass is provided with optical fiber ditch
Groove, pedestal both sides are provided with wire hole, and wire hole and optical fiber groove are located along the same line, and optical fiber is worn from the wire hole of pedestal one end
Enter by the optical fiber groove on two inertial mass, passed from the wire hole of the pedestal other end, optical fiber is provided with fiber grating,
Fiber grating is arranged between two inertial mass, and optical fiber and the optical fiber groove at fiber grating two ends are connected；
Described flexible hinge is straight round flexible hinge, and two inertial mass occur relative position around flexible hinge
Move, so that Fiber Bragg Grating FBG produces strain.
According to above-mentioned technical proposal, described fiber grating is Fiber Bragg Grating FBG.
According to above-mentioned technical proposal, within 5mm, centre wavelength is 1525nm- to the length of Fiber Bragg Grating FBG
1565nm。
According to above-mentioned technical proposal, optical fiber is pasted by cementing agent and is fixed in optical fiber groove.
According to above-mentioned technical proposal, pedestal, flexible hinge and inertial mass are processed by same elastomer.
According to above-mentioned technical proposal, the walled thickness of straight round flexible hinge is 0.5-2mm.
According to above-mentioned technical proposal, the material of whole sensor core is stainless steel or titanium alloy.
According to above-mentioned technical proposal, optical fiber groove is arranged at the top of inertial mass.
A rectangular through-hole is offered according to above-mentioned technical proposal, on inertial mass, different size is provided with rectangular through-hole
Intermediate mass block.
According to above-mentioned technical proposal, pedestal surrounding thickness between 3mm-5mm, intermediate mass block and flexible hinge width one
Sample, width is in 10mm-15mm.
The invention has the advantages that：
The present invention is integrated, and small volume is easy to encapsulation, and simple structure is greatly saved space, reduces biography
The encapsulation volume and packaging process of sensor, long-term reliability are high, with frequency measurement scope higher, by two inertia masses
The relative motion of block and the length of reduction fiber grating, are conducive to increasing transducer sensitivity, in the presence of driving source, two
There is micro breadth oscillation in inertial mass, the counter motion of fiber grating two ends is hauled, using right around the flexible hinge of respective connection
Title formula flexible hinge instead of traditional spring, cantilever beam or other elastomers structure, and quality-spring is constituted with inertial mass
System, integral structure increases the resonant frequency of sensor, and the relative motion of symmetrical expression flexible hinge is by the spirit of the sensor that doubles
Sensitivity, improves the sensitivity of sensor, is particularly suited for wide frequency domain scope acceleration analysis.
Brief description of the drawings
Fig. 1 is the structural representation of the round flexible hinge optical fibre grating acceleration sensor of Integral direct in the embodiment of the present invention
Figure；
In figure, 1- optical fiber, 2- wire holes, 3- optical fiber grooves, 4- Fiber Bragg Grating FBGs, 5- pedestals, 6- flexible hinges, 7-
Inertia mass is fast, 8- through holes.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
Shown in reference picture 1, the round flexible hinge optical fiber light of a kind of Integral direct in one embodiment that the present invention is provided
Grid acceleration transducer, including sensor core and optical fiber, sensor core include pedestal, two flexible hinges and two inertia
Mass, two flexible hinges and two inertial mass are symmetrically distributed in the both sides in pedestal, and inertial mass is by flexibility
Hinge is connected with pedestal, and inertial mass is provided with optical fiber groove, and pedestal both sides are provided with wire hole, wire hole and optical fiber groove position
In on same straight line, optical fiber is penetrated by the optical fiber groove on two inertial mass, from pedestal from the wire hole of pedestal one end
The wire hole of the other end is passed, and optical fiber is provided with fiber grating, and fiber grating is arranged between two inertial mass, optical fiber light
The optical fiber at grid two ends is connected with optical fiber groove；
Described flexible hinge is straight round flexible hinge, and two inertial mass occur relative position around flexible hinge
Move, so that Fiber Bragg Grating FBG produces strain；Inventive sensor core body is integrated, and pedestal is housing, shape
Integralization structure, small volume is easy to encapsulation, and simple structure is greatly saved space, reduces the encapsulation volume of sensor
And packaging process, long-term reliability is high, with frequency measurement scope higher, by two relative motions of inertial mass and
Reduce fiber grating length, be conducive to increase transducer sensitivity, in the presence of driving source, two inertial mass around
Each there is micro breadth oscillation in the flexible hinge of connection, haul the counter motion of fiber grating two ends, use symmetrical expression flexible hinge generation
Traditional spring, cantilever beam or other elastomers structure are replaced, mass-spring system, integration knot have been constituted with inertial mass
Structure increases the resonant frequency of sensor, and the sensitivity of the sensor that doubles is improve biography by the relative motion of symmetrical expression flexible hinge
The sensitivity of sensor, is particularly suited for wide frequency domain scope acceleration analysis, on this basis, by reducing between inertial mass
Distance and inertia grating distance by the sensitivity of greatly increase sensor, experiment test shows acceleration sensing of the present invention
Device sensitivity in measurement frequency 10-2000Hz can reach more than 20pm/g.
Further, described fiber grating is Fiber Bragg Grating FBG, and Fiber Bragg Grating FBG 4 is in two inertia masses
By after appropriate pre-stretching, pasting 353ND with cementing agent and being fixed in optical fiber groove 3 in the middle of block 7.
Further, within 5mm, centre wavelength is 1525nm-1565nm to the length of Fiber Bragg Grating FBG.
Further, optical fiber is pasted by cementing agent and is fixed in optical fiber groove.
Further, pedestal, flexible hinge and inertial mass are processed by same elastomer.
Further, the walled thickness of straight round flexible hinge is 0.5-2mm.
Further, both sides flexible hinge is consistent with inertial mass structural parameters, before and after sensor and symmetrical.
Further, the material of whole sensor core is stainless steel or titanium alloy.
Further, optical fiber groove is arranged at the top of inertial mass.
Further, the distance in the middle of two inertial mass 7 is not more than 5mm, the optical fiber ditch flute length on inertial mass
Degree is not less than 5mm, and depth is 0.5mm, and sticking area coat in two ends optical fiber is peeled off, and length 5mm or so is not exceeded
The length of gluing, is easy to paste firm, and long-term reliability is high.
Further, a rectangular through-hole is offered on inertial mass, the middle interstitial of different size is provided with rectangular through-hole
Gauge block；It is arranged in rectangular through-hole by selecting the intermediate mass block of different size, for adjusting inertial mass centroid distance
The horizontal range at flexible hinge center, and the most thin place of inertial mass should be greater than the walled thickness of flexible hinge.
Further, pedestal surrounding thickness is between 3mm-5mm, intermediate mass block as flexible hinge width, width
In 10mm-15mm, the width of pedestal is slightly lower than.
During work, acceleration transducer is fixed on object under test, when there is driving source in the external world, sensor is with to be measured
Object vibrates together, so as to cause two inertial mass 7 to occur to rotate a little relative to pedestal 5, and rotation direction conversely,
Fiber grating 4 is set axially to stretch, the change of axial strain makes the centre wavelength of fiber grating change, so that will
The signal of extraneous acceleration is converted to the drift value of fiber bragg grating center wavelength, by the drift for setting up fiber bragg grating center wavelength
Amount and the linear relationship of acceleration magnitude, dynamic excitation can be both determined when solution is transferred to the drift value of fiber bragg grating center wavelength
The value of the acceleration in source, while vibration frequency specturm analysis can be carried out.
The operation principle of the round flexible hinge optical fibre grating acceleration sensor of Integral direct of the present invention is：Acceleration is passed
Sensor is fixed on object under test, and when there is driving source in the external world, sensor vibrates together with object under test, so as to cause two
Inertial mass occurs to rotate a little relative to pedestal, and rotation direction is conversely, make fiber grating axially stretch,
The change of axial strain makes the centre wavelength of fiber grating change, so as to the signal of extraneous acceleration is converted into optical fiber light
The drift value of grid centre wavelength, by setting up the drift value of fiber bragg grating center wavelength and the linear relationship of acceleration magnitude, when
Solution can both determine the value of the acceleration in dynamic excitation source when being transferred to the drift value of fiber bragg grating center wavelength, while can carry out
Vibration frequency specturm analysis.
Only presently preferred embodiments of the present invention above, can not limit the interest field of the present invention with this certainly,
Therefore the equivalence changes made according to scope of the present invention patent, still belong to protection scope of the present invention.
Claims (10)
1. the round flexible hinge optical fibre grating acceleration sensor of a kind of Integral direct, it is characterised in that including sensor core
And optical fiber, sensor core includes pedestal, two flexible hinges and two inertial mass, two flexible hinges and two inertia
Mass is symmetrically distributed in the both sides in pedestal, and inertial mass is connected with pedestal by flexible hinge, is set on inertial mass
There is optical fiber groove, pedestal both sides are provided with wire hole, and wire hole and optical fiber groove are located along the same line, optical fiber is from pedestal one end
Wire hole is penetrated by the optical fiber groove on two inertial mass, is passed from the wire hole of the pedestal other end, and optical fiber is provided with
Fiber grating, fiber grating is arranged between two inertial mass, and the optical fiber at fiber grating two ends is connected solid with optical fiber groove
It is fixed；
Described flexible hinge is straight round flexible hinge, and two inertial mass occur relative displacement around flexible hinge, from
And Fiber Bragg Grating FBG is produced strain.
2. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
Described fiber grating is Fiber Bragg Grating FBG.
3. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 2, it is characterised in that
Within 5mm, centre wavelength is 1525nm-1565nm to the length of Fiber Bragg Grating FBG.
4. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
Optical fiber is pasted by cementing agent and is fixed in optical fiber groove.
5. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
Pedestal, flexible hinge and inertial mass are processed by same elastomer.
6. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
The walled thickness of straight round flexible hinge is 0.5-2mm.
7. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
The material of whole sensor core is stainless steel or titanium alloy.
8. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
Optical fiber groove is arranged at the top of inertial mass.
9. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, it is characterised in that
A rectangular through-hole is offered on inertial mass, the intermediate mass block of different size is provided with rectangular through-hole.
10. the round flexible hinge optical fibre grating acceleration sensor of Integral direct according to claim 1, its feature exists
In between 3mm-5mm, as flexible hinge width, width is in 10mm-15mm for intermediate mass block for pedestal surrounding thickness.
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| CN201710054036.1A CN106814216A (en) | 2017-01-24 | 2017-01-24 | The round flexible hinge optical fibre grating acceleration sensor of Integral direct |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860462A (en) * | 2017-12-19 | 2018-03-30 | 云南电网有限责任公司昭通供电局 | A kind of more cantilever beam all insulation material optical fiber raster vibration sensors |
| CN108663110A (en) * | 2018-04-28 | 2018-10-16 | 武汉理工大学 | Optical fibre grating acceleration sensor based on shaft flexible hinge and measurement method |
| 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 |
| CN109725174A (en) * | 2019-03-07 | 2019-05-07 | 中国船舶重工集团公司第七0四研究所 | Composite vibrating acceleration transducer |
| WO2019104771A1 (en) * | 2017-11-29 | 2019-06-06 | 武汉理工大学 | Small fiber grating two-dimensional vibration sensor |
| CN109856423A (en) * | 2019-02-28 | 2019-06-07 | 武汉理工大学 | Three-dimensional FBG accelerometer and its manufacturing process based on flexible hinge |
| CN110108901A (en) * | 2019-06-17 | 2019-08-09 | 天津师范大学 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
| CN110297106A (en) * | 2019-07-09 | 2019-10-01 | 武汉理工大学 | High-sensitivity optical fiber grating acceleration transducer based on rigid hinge |
| CN110531109A (en) * | 2019-08-14 | 2019-12-03 | 武汉理工大学 | A kind of optical fibre grating acceleration sensor and its measurement method of the hardened structure of mini elastic |
| CN111239438A (en) * | 2020-02-24 | 2020-06-05 | 山东省科学院激光研究所 | Optical fiber grating acceleration sensor |
| CN111505340A (en) * | 2020-04-30 | 2020-08-07 | 中山市精量光电子科技有限公司 | Fiber grating two-dimensional acceleration sensor with small structure |
| CN111693735A (en) * | 2020-04-30 | 2020-09-22 | 中山市精量光电子科技有限公司 | Two-dimensional FBG accelerometer with high sensitivity and high natural frequency |
| CN111879969A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Medium-high frequency elliptical hinge double-fiber grating acceleration sensor and measurement method |
| CN111982265A (en) * | 2019-05-21 | 2020-11-24 | 武汉理工大学 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
| CN112014594A (en) * | 2020-08-31 | 2020-12-01 | 中国地震局地球物理研究所 | Sensitivity-enhanced FBG acceleration sensor based on flexible hinge and measurement method |
| CN114217092A (en) * | 2021-12-15 | 2022-03-22 | 武汉理工大学 | FBG acceleration sensor based on diaphragm and elliptical hinge |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2019104771A1 (en) * | 2017-11-29 | 2019-06-06 | 武汉理工大学 | Small fiber grating two-dimensional vibration sensor |
| CN107860462A (en) * | 2017-12-19 | 2018-03-30 | 云南电网有限责任公司昭通供电局 | A kind of more cantilever beam all insulation material optical fiber raster vibration sensors |
| CN108663110A (en) * | 2018-04-28 | 2018-10-16 | 武汉理工大学 | Optical fibre grating acceleration sensor based on shaft flexible hinge and measurement method |
| CN109856423B (en) * | 2019-02-28 | 2021-06-04 | 武汉理工大学 | Three-dimensional FBG accelerometer based on flexible hinge and manufacturing process thereof |
| CN109856423A (en) * | 2019-02-28 | 2019-06-07 | 武汉理工大学 | Three-dimensional FBG accelerometer and its manufacturing process based on flexible hinge |
| CN109725174A (en) * | 2019-03-07 | 2019-05-07 | 中国船舶重工集团公司第七0四研究所 | Composite vibrating acceleration transducer |
| CN109725174B (en) * | 2019-03-07 | 2024-04-30 | 中国船舶重工集团公司第七0四研究所 | Composite vibration acceleration sensor |
| CN111982265A (en) * | 2019-05-21 | 2020-11-24 | 武汉理工大学 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
| CN110108901A (en) * | 2019-06-17 | 2019-08-09 | 天津师范大学 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
| CN110297106A (en) * | 2019-07-09 | 2019-10-01 | 武汉理工大学 | High-sensitivity optical fiber grating acceleration transducer based on rigid hinge |
| CN110297106B (en) * | 2019-07-09 | 2021-07-20 | 武汉理工大学 | High-sensitivity fiber bragg grating acceleration sensor based on rigid hinge |
| CN110531109A (en) * | 2019-08-14 | 2019-12-03 | 武汉理工大学 | A kind of optical fibre grating acceleration sensor and its measurement method of the hardened structure of mini elastic |
| CN110531109B (en) * | 2019-08-14 | 2022-01-04 | 武汉理工大学 | Fiber bragg grating acceleration sensor with small elastic plate structure and measuring method |
| CN111239438A (en) * | 2020-02-24 | 2020-06-05 | 山东省科学院激光研究所 | Optical fiber grating acceleration sensor |
| CN111693735B (en) * | 2020-04-30 | 2021-08-17 | 中山市精量光电子科技有限公司 | Two-dimensional FBG accelerometer with high sensitivity and high natural frequency |
| CN111693735A (en) * | 2020-04-30 | 2020-09-22 | 中山市精量光电子科技有限公司 | Two-dimensional FBG accelerometer with high sensitivity and high natural frequency |
| CN111505340A (en) * | 2020-04-30 | 2020-08-07 | 中山市精量光电子科技有限公司 | Fiber grating two-dimensional acceleration sensor with small structure |
| CN112014594A (en) * | 2020-08-31 | 2020-12-01 | 中国地震局地球物理研究所 | Sensitivity-enhanced FBG acceleration sensor based on flexible hinge and measurement method |
| CN111879969A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Medium-high frequency elliptical hinge double-fiber grating acceleration sensor and measurement method |
| CN114217092A (en) * | 2021-12-15 | 2022-03-22 | 武汉理工大学 | FBG acceleration sensor based on diaphragm and elliptical hinge |
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Application publication date: 20170609 |