CN110108901A - Accelerate fiber grating acceleration sensor and the application of monitoring for hull - Google Patents
Accelerate fiber grating acceleration sensor and the application of monitoring for hull Download PDFInfo
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- CN110108901A CN110108901A CN201910520918.1A CN201910520918A CN110108901A CN 110108901 A CN110108901 A CN 110108901A CN 201910520918 A CN201910520918 A CN 201910520918A CN 110108901 A CN110108901 A CN 110108901A
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- outer housing
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- 230000001133 acceleration Effects 0.000 title claims abstract description 65
- 239000000835 fiber Substances 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims abstract description 14
- 230000009977 dual effect Effects 0.000 claims abstract description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 13
- 230000035945 sensitivity Effects 0.000 claims description 11
- 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 description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000003822 epoxy resin Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
Classifications
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The present invention relates to a kind of fiber grating acceleration sensor and applications for accelerating monitoring for hull, are mainly made of sensor outer housing, sensor outer housing lid, sensor sensing device, symmetrical dual hinge structure etc..Using epobond epoxyn, two grating regions of prestretching optical fiber are respectively adhered between the mass block of left and right ends, by watertight flanged joint to transmission cable, Ship Structure acceleration value is shown in the form of the wavelength change of fiber grating at (FBG) demodulator end optical fiber.The present invention utilizes watertight flange, is integrally formed aluminium alloy structure shell and casing cover, improves the watertightness and stability of system, can be used in severe use environment.The sensor can dynamically measure Ship Structure acceleration figure, and eliminate the influence of temperature on fiber grating, ensure that reliability and durability that sensor is applied in marine field.
Description
Technical field
The invention belongs to Fiber Grating Sensors Technology fields, are related to the measurement of marine ship structure acceleration.More specifically
Say it is a kind of fiber grating acceleration sensor and application for accelerating monitoring for hull.
Background technique
In navigational field, since there is too many uncertainty at sea, the impact of stormy waves is so that ship motion abnormal state is multiple
Miscellaneous, we also need to consider the impact of arm discharge, especially slamming load on naval vessels, this factor mainly causes ship to produce
Vertical direction acceleration is given birth to.The slamming vibration of hull is that ship is carrying out arm discharge, blast impulse, hull collision, wave
Caused by the reasons such as slamming, the seaway load of hull is one kind of slamming load, be ship in river or ocean navigation by
The load caused to water flow or stormy waves impact, seaway load randomness are stronger.Due to slamming load act on hull when
Between it is very short, hull, which has little time to be subjected to displacement load, just to be disappeared, and traditional acceleration transducer for being adapted to hull can not be straight
The vibratory response for detecting hull in the case where attacking load is connect, the use of acceleration transducer can count magnitude of vibrations and vibration frequency
The position that rate and vibration occur.
The fiber grating acceleration sensor for accelerating monitoring for hull is that optical fibre grating acceleration is arranged in Ship Structure
Sensor realizes the automatic monitoring of Ship Structure acceleration, true and reliable data is provided for policymaker on ship, to guarantee hull
Safety provides scientific basis, improves security performance.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of hulls, and the fiber grating of monitoring to be accelerated to accelerate to pass
Sensor design has preferable frequency response and higher sensitivity using the grating acceleration sensor of symmetrical dual-hinge design,
Realize the real-time monitoring of Ship Structure acceleration.
The present invention to achieve the goals above, adopts the following technical scheme that:
A kind of hull accelerates the fiber grating acceleration sensor of monitoring, it is characterised in that the sensing system includes: sensing
Device shell 8, sensor outer housing lid 3, acceleration sensor Sensitive Apparatus, symmetrical dual hinge structure.
Wherein sensor outer housing 8 be by aluminium alloy by cutting, polishing, oxidation and etc. be process, without splicing
The side of the process of welding, sensor outer housing 8 is equipped with watertight flange 2.Sensor outer housing lid 3 is surrounded by sealed groove, and
The nested installation sealing strip in sealed groove, is equipped with casing cover fixation hole 7 in sensor outer housing lid 3, by fixed screw and passes
Sensor shell 8 is sealed.
Acceleration sensor Sensitive Apparatus is by first grating 5 of two different wave lengths of a series connection and the prestretching of the second grating 10
The optical fiber 1 and temperature-compensating grating 12 for stretching 2nm are constituted.Two grating regions of fiber grating are distinguished using epobond epoxyn
It is pasted between left mass block 4 and the top and bottom of right mass block 6, transmission cable is connected to by watertight flange 2.
The symmetrical dual hinge structure is differential symmetry hinge arrangement, it is made of a monolith beryllium-bronze, by linear
Cutting and processing, are an overall models.Including pedestal 11, pedestal fixation hole 9, flexible hinge 13, mass block 4.Quality
Block 4 is connect by flexible hinge 13 with pedestal 11, and pedestal 11 is directly connected to sensor outer housing 8 by fixed screw.
Hull of the present invention accelerates the fiber grating acceleration sensor of monitoring to be characterized in that:
(1) hull, which accelerates the fiber grating acceleration sensor of monitoring, is fixed on ship by sensor outer housing 8, to surveying vessel
The hull acceleration value of body.
(2) transducer body portions such as acceleration sensor Sensitive Apparatus and symmetrical dual hinge structure by sensor outer housing lid 3,
The sealing device institute seal protection that sensor outer housing 8 forms improves the watertightness and anti-destructive of sensing system, and guaranteeing should
The stable work of optical fibre grating acceleration sensor.
It is special the present invention further discloses the application method that a kind of hull accelerates the fiber grating acceleration sensor of monitoring
Sign is:
(1) sensor being sealed is fixed on to the stem position of hull, the optical fiber of sensor internal is drawn by watertight flange 2
Out, it is connected to the transmission cable of hull, can finally observe the acceleration value of Ship Structure in real time at (FBG) demodulator end.
(2) sensor improves the watertightness and stability of system using aluminium alloy structure and sealing cover is integrally formed.Water
The use of close flange 2 can promote the corrosion resistance of sensor, and reducing short interruption, there is a situation where improve the measurement of system
Precision is convenient for later maintenance.
More detailed description of the present invention is as follows:
Acceleration sensor Sensitive Apparatus by one connect two different wave lengths the first grating 5 and the second grating 10 pre-stretching
The optical fiber 1 and temperature-compensating grating 12 of 2nm is constituted.Two grating regions of fiber grating (have city using epobond epoxyn
Sell) it is respectively adhered between left mass block 4 and the top and bottom of right mass block 6, transmission cable is connected to by watertight flange 2.
The deformation of fiber grating and the wavelength change of fiber grating are substantially linear relationship, by the backoff algorithm at (FBG) demodulator end, are obtained
Obtaining is to change between wavelength and the acceleration value of Ship Structure in ratio, and the acceleration value of final Ship Structure is with fiber grating
The form of wavelength change shown at (FBG) demodulator end.
Sensor outer housing lid 3 is surrounded by sealed groove, and the nested installation sealing strip in sealed groove, in sensor
Casing cover 3 is equipped with casing cover fixation hole 7, is connected and sealed by fixed screw and sensor outer housing 8, improves the water of system
Close property and stability.
The present invention further disclose for hull accelerate monitoring fiber grating acceleration sensor application method with
The application of aspect is monitored automatically in Ship Structure acceleration value.The simulation experiment result show the sensor frequency be 0-100 Hz
Sensitivity in range is 524 pm/g.
Present invention mainly solves the measurement problem of fiber-optic grating sensor acceleration value in the extreme circumstances, high spot reviews
The sensitivity and its frequency response of fiber-optic grating sensor, main difficult point are the stability of fiber Bragg grating sensor system
And watertightness.
The fiber grating acceleration sensor disclosed by the invention for accelerating monitoring for hull and application are compared with prior art
It is possessed to have the active effect that
(1) accelerate the fiber grating acceleration sensor design of monitoring for hull has good for hull operating environment requirements
Watertightness, preferable frequency response, higher sensitivity.
(2) use of symmetrical dual hinge structure can greatly enhance the sensitivity of sensor, promote sensor measurement hull
The range of acceleration.
(3) for poor working conditions such as ocean humidity, surges, the present invention utilizes aluminium alloy structure shell and casing cover,
It ensure that the durability and reliability that the fiber grating acceleration sensor of hull acceleration value measurement is applied in marine field.
Detailed description of the invention
Fig. 1 is the fiber grating acceleration sensor structural schematic diagram that the present invention accelerates monitoring for hull；
In figure: 1-optical fiber, 2-watertight flanges, 3-sensor outer housing lids, 4-left mass blocks, the 5-the first grating, 6-right matter
Gauge block, 7-casing cover fixation holes, 8-sensor outer housings, 9-pedestal fixation holes, the 10-the second grating, 11-pedestals, 12-temperature
Spend null grating, 13-flexible hinges.
Specific embodiment
The present invention is described below by specific embodiment.Unless stated otherwise, technological means used in the present invention
It is method known in those skilled in the art.In addition, embodiment is interpreted as illustrative, it is not intended to limit the present invention
Range, the spirit and scope of the invention are limited only by the claims that follow.To those skilled in the art, without departing substantially from this
Under the premise of invention spirit and scope, in these embodiments various changes or change also belong to protection model of the invention
It encloses.The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Embodiment 1
Accelerate the fiber grating acceleration sensor of monitoring for hull, it is characterised in that the sensor includes: outside sensor
Shell 8, sensor outer housing lid 3, acceleration sensor Sensitive Apparatus, symmetrical dual hinge structure.Wherein sensor outer housing 8 is by aluminium alloy
By cutting, polishing, oxidation and etc. be disposably process, without splicing welding process, the side of sensor outer housing 8
Equipped with watertight flange 2.Sensor outer housing lid 3 is surrounded by sealed groove, and the nested installation sealing strip in sealed groove,
Sensor outer housing lid 3 is equipped with casing cover fixation hole 7, is connected and sealed by fixed screw and sensor outer housing 8.
Acceleration sensor Sensitive Apparatus is by first grating 5 of two different wave lengths of a series connection and the prestretching of the second grating 10
The optical fiber 1 and temperature-compensating grating 12 for stretching 2nm are constituted.Two grating regions of fiber grating are distinguished using epobond epoxyn
It is pasted between left mass block 4 and the top and bottom of right mass block 6, transmission cable is connected to by watertight flange 2.
The symmetrical dual hinge structure is differential symmetry hinge arrangement, it is made of a monolith beryllium-bronze, by linear
Cutting and processing, are an overall models.The use of symmetrical dual hinge structure can greatly enhance the sensitivity of sensor, be promoted
The range of sensor measurement Ship Structure acceleration.
Embodiment 2
Application method includes:
(1) sensor being sealed is fixed on to the stem position of hull, the optical fiber of sensor internal is drawn by watertight flange 2
Out, it is connected to the transmission cable of hull, can finally observe the acceleration value of Ship Structure in real time at (FBG) demodulator end.
(2) sensor improves the watertightness and stability of system using aluminium alloy structure and sealing cover is integrally formed.Water
The use of close flange 2 can promote the corrosion resistance of sensor, and reducing short interruption, there is a situation where improve the measurement of system
Precision is convenient for later maintenance.
(3) acceleration value of Ship Structure is shown in the form of the wavelength change of fiber grating at (FBG) demodulator end, optical fiber light
The deformation of grid and the wavelength change of fiber grating are substantially linear relationship, final to obtain by the backoff algorithm at (FBG) demodulator end
The acceleration value of wavelength and Ship Structure.
Embodiment 3
Influence of the temperature to Ship Structure acceleration analysis is eliminated using reference grating method, with the grating of a not strained effect
It realizes temperature measurement, is fused to acceleration transducer Sensitive Apparatus, be placed in sensor.Sensor has once encapsulated
At fiber bragg grating center wavelength variable quantity will not be affected by temperature, and only change caused strain wave journey by raft down the Yangtze River with hull acceleration
Shifting amount is related, to realize the fiber-optic grating sensor of temperature self-compensation.
Embodiment 4
The invention belongs to hinge-L-type structures, it is assumed thatf 0For intrinsic frequency；For the angular frequency of vibration source；For intrinsic angular frequency
Rate；For frequency ratio；For damping ratio；A is vibration acceleration, then by principle of elasticity it is found that mass block vibrated
Amplitude are as follows:
According to the geometrical relationship of structure, it is when hard-over occurs under the action of external acceleration motivates for inertia mass part
Vibration when, the axial length variable quantity of the FBG pasted in structure are as follows:
The axial length variable quantity formula of FBG is substituted into the relative variation formula of fiber bragg grating center wavelength, opposite wave can be obtained
Long variable quantity are as follows:
Define the ratio that central wavelength is wavelength variable quantity and acceleration to the response sensitivity S of acceleration, it may be assumed that
Then under the effect of extraneous pumping signal, the sensitivity of sensor are as follows:
Assuming that acceleration transducer of the present invention is in ideal flat region acceleration responsive sensitivity when environmental stimuli f < < f0 are as follows:
Simulation result explanation:
It is 524 pm/g that the sensor can be obtained after calculating, which is sensitivity within the scope of 0-100 Hz in frequency,.
Claims (5)
1. a kind of fiber grating acceleration sensor for accelerating monitoring for hull, it is characterised in that it includes: sensor outer housing
(8), sensor outer housing lid (3), acceleration sensor Sensitive Apparatus, symmetrical dual hinge structure；
Wherein sensor outer housing (8) is by aluminium alloy one-pass molding, and the side of sensor outer housing is equipped with watertight flange (2), sensing
Device casing cover (3) is surrounded by sealed groove, and the nested installation sealing strip in sealed groove, and sensor outer housing is covered with outer
Cap fixation hole (7) is sealed by fixed screw and sensor outer housing (8)；
The acceleration sensor Sensitive Apparatus by one connect two different wave lengths the first grating (5) and the second grating (10)
Pre-stretching 2nm optical fiber (1) and temperature-compensating grating (12) constitute, two grating regions of optical fiber are bonded using epoxy resin
Agent is respectively adhered between left mass block (4) and the top and bottom of right mass block (6), is connected to transmission by watertight flange (2)
Optical cable；
The symmetrical dual hinge structure is differential symmetry hinge arrangement, is made up of a monolith beryllium-bronze of linear cutter
, it is an overall model；Including pedestal (11), pedestal fixation hole (9), flexible hinge (13), mass block (4)；Quality
Block (4) is connect by flexible hinge (13) with pedestal (11), and pedestal (11) is directly connected to sensor outer housing (3)；Symmetric double hinge
The use of chain structure can greatly enhance the sensitivity of sensor, promote the range of sensor measurement hull acceleration.
2. a kind of fiber grating acceleration sensor for accelerating monitoring for hull according to claim 1, it is characterised in that
The acceleration sensor Sensitive Apparatus, cooperates symmetrical dual hinge structure, can dynamically measure hull acceleration value.
3. the fiber grating acceleration sensor according to claim 1 for accelerating monitoring for hull, it is characterised in that described
Sensor outer housing (3) be by aluminium alloy by cutting, polishing, oxidation step is disposably process.
4. a kind of application method of fiber grating acceleration sensor for accelerating monitoring for hull according to claim 1,
It is characterized by: the sensor being sealed to be fixed on to the stem position of hull, the optical fiber of sensor internal passes through watertight flange
(2) it draws, is connected to the transmission cable of hull, can finally observe the acceleration value of Ship Structure in real time at (FBG) demodulator end.
5. as claimed in claim 4 accelerate the fiber grating acceleration sensor application method of monitoring for supervising automatically for hull
Survey the application in terms of hull acceleration value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910520918.1A CN110108901A (en) | 2019-06-17 | 2019-06-17 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910520918.1A CN110108901A (en) | 2019-06-17 | 2019-06-17 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077342A (en) * | 2020-01-21 | 2020-04-28 | 天津师范大学 | High-frequency acceleration sensor for ship sloshing response monitoring and use method thereof |
| CN111537119A (en) * | 2020-04-22 | 2020-08-14 | 国网电力科学研究院有限公司 | High-precision fiber grating displacement meter with temperature compensation |
| 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 |
| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077342A (en) * | 2020-01-21 | 2020-04-28 | 天津师范大学 | High-frequency acceleration sensor for ship sloshing response monitoring and use method thereof |
| CN111537119A (en) * | 2020-04-22 | 2020-08-14 | 国网电力科学研究院有限公司 | High-precision fiber grating displacement meter with temperature compensation |
| CN111537119B (en) * | 2020-04-22 | 2022-06-14 | 国网电力科学研究院有限公司 | High-precision fiber grating displacement meter with temperature compensation |
| 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 |
| 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 |
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Application publication date: 20190809 |