CN107741255A - A kind of fiber grating flowmeter - Google Patents
A kind of fiber grating flowmeter Download PDFInfo
- Publication number
- CN107741255A CN107741255A CN201710816823.5A CN201710816823A CN107741255A CN 107741255 A CN107741255 A CN 107741255A CN 201710816823 A CN201710816823 A CN 201710816823A CN 107741255 A CN107741255 A CN 107741255A
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- floating member
- force measuring
- fixed component
- fiber grating
- measuring machine
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- 239000000835 fiber Substances 0.000 title claims abstract description 117
- 238000007667 floating Methods 0.000 claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 14
- 238000005457 optimization Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001661355 Synapsis Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013305 flexible fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
Abstract
The invention discloses a kind of fiber grating flowmeter, the flowmeter includes floating member, Transmission Fibers, fixed component, the data processing unit with optical fiber pigtail, the optical fiber pigtail is connected with Transmission Fibers, the Transmission Fibers pass through fixed component and floating member, are provided with mobile with floating member in the Transmission Fibers between the floating member and fixed component and change the sensor fibre grating of resonance wavelength.The advantages of flowmeter, is：The flowmeter realizes the measurement of flow velocity by Transmission Fibers, the simple combination can of floating member, simple and practical.
Description
Technical field
The present invention relates to the field of the measurement of rate of flow of fluid, more particularly to a kind of fiber grating flowmeter.
Background technology
Industry and people's lives many fields, be required for the flow of convection body to be monitored, and the flow of fluid with
The flow velocity of fluid is closely related, while flow velocity measurement and a hydromechanical fundamental measurement, currently used flow velocity measurement
Instrument has：Vortex-shedding meter, turbine flowmeter, target type meter etc., these instruments belong to electric sensor, electric sensor
Generally existing is perishable, easily by electromagnetic interference, sealing difference the shortcomings of.
Fiber-optic grating sensor in the absence of above mentioned problem, while has sensitivity due to being sensed using fiber grating
High, the advantages that linearity is good, increasingly it is valued by people.The flowmeter based on fiber grating reported both at home and abroad at present is big
All exist complicated.Therefore, it is high to be badly in need of a kind of stability, makes simple, flexible fiber grating flowmeter.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to solve sensor fibre grating in the prior art
It is complicated the problem of, therefore, the present invention provides a kind of fiber grating flowmeter.
To achieve the above object, the present invention uses following technical scheme：
A kind of fiber grating flowmeter, including floating member, Transmission Fibers, fixed component, electrically connected with Transmission Fibers
Data processing unit, the Transmission Fibers pass through fixed component and floating member, between the floating member and fixed component
It is provided with mobile with floating member in Transmission Fibers and changes the sensor fibre grating of resonance wavelength.
Optimization, force measuring machine is additionally provided between the floating member and fixed component, the force measuring machine includes bullet
Spring, the Transmission Fibers between the floating member and fixed component pass through spring inner, Transmission Fibers close to floating member one
End is moved with floating member, and one end away from floating member is fixed.
Optimization, the force measuring machine also includes sleeve, sliding block, and the sliding block includes fixing end and top, the sleeve
Lower ending opening, sleeve is enclosed on sliding block and moves up and down, and the outer surface of sleeve upper end is fixedly connected with floating member, the sliding block
Fixing end be fixed in fixed component, spring is arranged between the inner surface of the sleeve upper end and the top of sliding block, described
Sleeve through hole and slider throughbores that Transmission Fibers pass vertically through are respectively arranged with sleeve, sliding block.
Optimization, the top of the sliding block and the lower end of sleeve are provided with sliding-off proof mechanism.
Optimization, the fixed component includes upper fixed component and lower fixed component, and the force measuring machine is two, respectively
For the first force measuring machine and the second force measuring machine, the first force measuring machine both ends are separately fixed at fixed component and float portion
On the upper side of part, the second force measuring machine both ends are separately fixed on the downside of lower fixed component and floating member.
Optimization, the sensor fibre grating is in tension state all the time.
Optimization, spring and the second force measuring machine described in when fiber grating flowmeter is unmeasured in first force measuring machine
Interior spring is in pressured state or tension state simultaneously.
Optimization, the lower surface of the floating member is horizontal.
Optimization, the floating member is aerofoil profile balance.
Optimization, when fiber grating flowmeter is unmeasured, the resonance wavelength and sensor fibre of the sensor fibre grating
The ratio between maximum resonance wavelength of grating is (0.25-0.75):1.
The advantage of the invention is that：
(1) present invention is by the movement of floating member, can by the variable quantity of the resonance wavelength of sense light line grating, pass
Floated to calculate variable quantity and sense light line grating of the resonance wavelength on the direction of buoyancy at the angle of inclination for feeling fiber grating
Stressing conditions on the direction of power, then pass through formulaRate of flow of fluid to be measured is tried to achieve, wherein ρ is to treat fluid measured
Density, C are aerofoil profile balance lift coefficient, and s is the area that aerofoil profile balance is projected on horizontal plane, and v is rate of flow of fluid to be measured, according to
Above-mentioned formula and datum obtain v value.The flowmeter is realized by Transmission Fibers, the simple combination can of floating member
The measurement of flow velocity.
(2) in the present invention, force measuring machine is set, and force measuring machine can pass through the deformation quantity of spring and the deformation system of spring
Count to measure suffered buoyancy, and the Transmission Fibers between floating member and fixed component pass through spring inner, can to pass
It is equal with the deformation quantity of spring to feel fiber grating deformation quantity, is also effectively prevented in velocity measurement, fixed component and float portion
Transmission Fibers between part are curve states.
(3) in the present invention force measuring machine structure setting, floating member can be caused to move up and down, it is so convenient to count
Calculate.
(4) force measuring machine is two in the present invention, is separately positioned on the upper and lower side of floating member, accordingly, each to survey
The data measured by sensor fibre grating in force mechanisms are transferred to data processing unit, the deformation of upper and lower two force measuring machines
Measure and make the difference calculating, the data that the sensor fibre grating inside two force measuring machines measures also make the difference calculating, can be poor except temperature etc.
The influence that extraneous factor is brought, reduce the mechanism of temperature-compensating in the prior art and the calculating process of temperature-compensating, can also protect
Demonstrate,prove whole flow measurement accuracy of measurement.
(5) sensor fibre grating of the present invention is in tension state all the time, when fiber grating flowmeter is unmeasured, the biography
It is (0.25-0.75) to feel the ratio between fiber grating resonance wavelength size and the resonance wavelength of maximum sensor fibre grating:1, it is such
Setting ensure that sensor fibre grating will not be broken in the case of pulling force maximum, and variable quantity can be also measured in lowest pull.
(6) floating member in the present invention uses aerofoil profile balance, improves the lift coefficient of floating member, increases sense light
The deflection of fine grating, so reduce the coefficient of error.
Brief description of the drawings
Fig. 1 is a kind of structure chart of fiber grating flowmeter of the present invention.
Fig. 2 is the structure chart of force measuring machine in a kind of fiber grating flowmeter of the present invention.
Reference implication is in figure:
1-go up fixed component 2-lower fixed component 102- aerofoil profile balances
103- the first force measuring machine the second force measuring machines of 104-
105- the first sensor fibre grating 106- the second sensor fibre gratings
107- Transmission Fibers 108- data processing unit 109- aerofoil profile balance through holes
110- sleeve 111- sliding block 112- spring 113- sleeve through hole 114- slider throughbores
Embodiment
As shown in figure 1, a kind of fiber grating flowmeter, including floating member, Transmission Fibers 107, fixed component, with light
The data processing unit 108 of fine tail optical fiber, optical fiber pigtail are welded to connect by optical fiber splicer and Transmission Fibers 107, the transmission
Optical fiber 107 passes through fixed component and floating member, is provided with the Transmission Fibers 107 between the floating member and fixed component
Change the sensor fibre grating of resonance wavelength with floating member movement, be additionally provided between the floating member and fixed component
Force measuring machine.Sensor fibre grating is in tension state all the time.Force measuring machine is additionally provided between floating member and fixed component.
In order to improve the lift coefficient of floating member, the deflection of sensor fibre grating, the lower surface of floating member are increased
To be horizontal, in this programme, floating member is aerofoil profile balance 102, and Transmission Fibers 107 pass through the aerofoil profile on aerofoil profile balance 102
Balance through hole 109.
As shown in Fig. 2 force measuring machine include sleeve 110, sliding block 111, spring 112, the lower ending opening of the sleeve 110,
Sleeve 110 is enclosed on sliding block 111 and moved up and down, and the outer surface of the upper end of sleeve 110 is fixedly connected with aerofoil profile balance 102, the cunning
Block 111 includes fixing end and top, and the fixing end of the sliding block 111 is fixed in fixed component, and spring 112 is arranged on the set
Between the cylinder inner surface of 110 upper ends and the top of sliding block 111, Transmission Fibers are respectively arranged with the sleeve 110, sliding block 111
107 sleeve through hole 113 and slider throughbores 114 passed vertically through, wherein sleeve through hole 113, slider throughbores 114, the three of spring 112
The axis of length direction overlap, Transmission Fibers 107 between aerofoil profile balance 102 and fixed component are through spring 112, sleeve
Through hole 113 and slider throughbores 114.
Transmission Fibers 107 through force measuring machine close to one end of aerofoil profile balance 102 are tache motorice, and the tache motorice can be set
Put in aerofoil profile balance 102, tache motorice is fixed on force measuring machine in the present embodiment, is located proximate to aerofoil profile balance 102, specifically
, the tache motorice of Transmission Fibers 107 is fixed on the upper end of sleeve 110.One end away from aerofoil profile balance 102 is fixing end, fixed
End can be fixed in fixed component, and fixing end is fixed on force measuring machine in the present embodiment, is located proximate to fixed component, tool
Body, fixing end is fixed on the fixing end of sliding block 114.
The top of sliding block 114 and the lower end of sleeve 110 are provided with sliding-off proof mechanism 115, in the present embodiment, sliding block 114
The diameter at other positions, and more than the diameter of the lower ending opening of sleeve 110.Sliding block 114 can also be arranged to the post of variable cross-section
Body, it is allowed to which sleeve 110 is enclosed on the displacement having on sliding block 114 on certain vertical direction.
Force measuring machine is two in this programme, respectively the first force measuring machine 103 and the second force measuring machine 104, accordingly
, fixed component is also two, respectively upper fixed component 1 and lower fixed component 2, the both ends of the first force measuring machine 103 point
The upper side of fixed component 1 and floating member is not fixed on, and the both ends of the second force measuring machine 104 are separately fixed at lower fixed component
2 and floating member downside on, wherein the sensor fibre grating in the first force measuring machine 103 is the first sensor fibre grating
105, the sensor fibre grating in the second force measuring machine 104 is the first sensor fibre grating 106.
Wherein upper fixing element 1 and lower fixture 2 can connect into a framework 3 by montant, by force measuring machine and aerofoil profile
Balance 102 is all disposed within framework 3, and framework 3 is float shape in measurement, vertical with the flow direction of fluid.
Slider throughbores 114 are provided with sealing structure with fixed component contact position, and sleeve through hole 113 connects with aerofoil profile balance 102
Synapsis is also equipped with sealing structure.When treating that fluid measured is corrosive fluid, sealing structure can prevent corrosive fluid from entering
In sleeve 110, corrode the mechanical structure in sleeve 110.
Wherein data processing unit 108 includes LASER Light Source (not shown), fiber Bragg grating (FBG) demodulator (does not show in figure
Go out), LASER Light Source sends light and transmitted by Transmission Fibers, is then believed by fiber Bragg grating (FBG) demodulator to be received back to the light sent back
Number.
When fiber grating flowmeter is unmeasured, the force measuring machine 104 of spring 112 and second in the first force measuring machine 103
Interior spring 112 is in pressured state or tension state simultaneously, is pressured state in this embodiment.In fiber grating flow
When counting unmeasured, the resonance wavelength of the resonance wavelength and the maximum of a sensor fibre grating 105 of the first sensor fibre grating 105
The ratio between be 0.5:1, the resonance wavelength of the resonance wavelength and the maximum of the second sensor fibre grating 106 of the second sensor fibre grating 106
The ratio between be 0.5:1.
The operation principle of the fiber grating flowmeter is as follows：
When fluid is by aerofoil profile balance 102, aerofoil profile balance 102 will produce a upward lift, and lift F meets following
Formula：
Wherein ρ is the density for treating fluid measured, and C is aerofoil profile balance lift coefficient, and s is that aerofoil profile balance is projected on horizontal plane
Area, v are rate of flow of fluid to be measured.
Now aerofoil profile balance 102 will drive the sleeve 110 in force measuring machine to move upwards, wherein the first force measuring machine 105
The compressive deformation of spring 112 become big, the compressive deformation of spring 112 of the second force measuring machine 106 diminishes, corresponding first sensor fibre
The deformation quantity of grating 105 reduces, i.e. the resonance wavelength of the first sensor fibre grating 105 reduces, the deformation of the second sensor fibre grating 106
Amount increase, i.e. the resonance wavelength increase of the second sensor fibre grating 106, specifically, two grating resonance wavelength variable quantity difference
For：
Wherein λBThe center resonance wavelength of two gratings, K1ε, K1T, K2ε, K2TThe respectively He of the first sensor fibre grating 105
Strain-responsive coefficient, the temperature coefficient of second sensor fibre grating 106, Δ ε, Δ T are sensor fibre grating strain amount, outside
Boundary's temperature knots modification.
Because two grating strain response coefficients, temperature coefficients of use are identical, (1), (2) two formulas are subtracted each other, and are obtained
Entirely the deformation quantity Δ x of force measuring machine is with relation between producing lift：
F=2k Δs x (5)
K is this deformation coefficient of spring 112.
Δ x includes the deformation quantity Δ x of the Transmission Fibers 107 in force measuring structure1With the deformation quantity Δ x of sensor fibre grating2,
Because both material properties are similar, by taking the sensor fibre grating 105 of Transmission Fibers 107 and first in the first force measuring machine 103 as an example
It can obtain：
l1、l2The length of Transmission Fibers 107 and the length of the first sensor fibre grating 105 respectively in the first force measuring machine 103
Degree.
Sensor fibre grating deformation quantity Δ x2, sensor fibre grating raw footage l2, fiber grating strain amount Δ ε relations be
It is various more than to obtain
According to formula (8), it is possible to the quick flow velocity size for obtaining fluid.
When the spring original state in force measuring machine is extended state, Cleaning Principle is similar.
Embodiment 2
The difference of the embodiment and embodiment 1 is the resonance wavelength and a sensing of the first sensor fibre grating 105
The ratio between maximum resonance wavelength of fiber grating 105 is 0.25:1, the resonance wavelength of the second sensor fibre grating 106 senses with second
The ratio between maximum resonance wavelength of fiber grating 106 is 0.25:1..
Embodiment 3
The difference of the embodiment and embodiment 1 is that the resonance wavelength first of the first sensor fibre grating 105 senses
The ratio between maximum resonance wavelength of fiber grating 105 is 0.75:1, the resonance wavelength of the second sensor fibre grating 106 senses with second
The ratio between maximum resonance wavelength of fiber grating 106 is 0.75:1.
In above three embodiment, floating member can be not only aerofoil profile balance 102, can also any relocatable portion
Part.It is optimal technical scheme that this programme, which is,.
The preferred embodiment of the invention is these are only, is not intended to limit the invention creation, it is all in the present invention
All any modification, equivalent and improvement made within the spirit and principle of creation etc., should be included in the guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of fiber grating flowmeter, it is characterised in that including floating member, Transmission Fibers (107), fixed component, carry
The data processing unit (108) of optical fiber pigtail, the optical fiber pigtail are connected with Transmission Fibers (107), the Transmission Fibers (107)
Through fixed component and floating member, it is provided with the Transmission Fibers (107) between the floating member and fixed component with floating
Dynamic component is mobile and changes the sensor fibre grating of resonance wavelength.
2. a kind of fiber grating flowmeter according to claim 1, it is characterised in that the floating member and fixed component
Between be additionally provided with force measuring machine, the force measuring machine includes spring (112), the biography between the floating member and fixed component
Lose fine (107) to move with floating member close to one end of floating member through spring (112) inside, Transmission Fibers (107), far
One end from floating member is fixed.
3. a kind of fiber grating flowmeter according to claim 2, it is characterised in that the force measuring machine also includes sleeve
(110), sliding block (111), the sliding block (111) include fixing end and top, the lower ending opening of the sleeve (110), sleeve
(110) it is enclosed on sliding block (111) and moves up and down, the outer surface of sleeve (110) upper end is fixedly connected with floating member, the sliding block
(111) fixing end is fixed in fixed component, and spring (112) is arranged on the inner surface and sliding block of the sleeve (110) upper end
(111) between top, the set that Transmission Fibers (107) pass vertically through is respectively arranged with the sleeve (110), sliding block (111)
Cylinder through hole (113) and slider throughbores (114).
A kind of 4. fiber grating flowmeter according to claim 3, it is characterised in that the top of the sliding block (111) and
The lower end of sleeve (110) is provided with sliding-off proof mechanism (115).
A kind of 5. fiber grating flowmeter according to claim 2-4 any one, it is characterised in that the fixed component
Including upper fixed component (1) and lower fixed component (2), the force measuring machine is two, respectively the first force measuring machine (103) and
Second force measuring machine (104), the first force measuring machine (103) both ends are separately fixed at fixed component (1) and floating member
Upper side on, the second force measuring machine (104) both ends are separately fixed on lower fixed component (2) and the downside of floating member.
6. a kind of fiber grating flowmeter according to claim 2, it is characterised in that the sensor fibre grating is located all the time
In tension state.
7. a kind of fiber grating flowmeter according to claim 5, it is characterised in that unmeasured in fiber grating flowmeter
The spring (112) in spring (112) and the second force measuring machine (104) in the force measuring machines of Shi Suoshu first (103) is in simultaneously
Pressured state or tension state.
8. a kind of fiber grating flowmeter according to claim 1, it is characterised in that the lower surface of the floating member is
It is horizontal.
9. a kind of fiber grating flowmeter according to claim 8, it is characterised in that the floating member is aerofoil profile balance
(102)。
10. a kind of fiber grating flowmeter according to claim 1, it is characterised in that do not surveyed in fiber grating flowmeter
During amount, the ratio between the resonance wavelength of the sensor fibre grating and the maximum resonance wavelength of sensor fibre grating are (0.25-0.75):
1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710816823.5A CN107741255B (en) | 2017-09-12 | 2017-09-12 | A kind of fiber grating flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710816823.5A CN107741255B (en) | 2017-09-12 | 2017-09-12 | A kind of fiber grating flowmeter |
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| Publication Number | Publication Date |
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| CN107741255A true CN107741255A (en) | 2018-02-27 |
| CN107741255B CN107741255B (en) | 2019-10-08 |
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| CN201710816823.5A Active CN107741255B (en) | 2017-09-12 | 2017-09-12 | A kind of fiber grating flowmeter |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201155991Y (en) * | 2007-12-20 | 2008-11-26 | 武汉理工大学 | Optical fibre grating acceleration sensor |
| CN104197999A (en) * | 2014-09-26 | 2014-12-10 | 哈尔滨工业大学 | Optical fiber multiphase flowmeter |
-
2017
- 2017-09-12 CN CN201710816823.5A patent/CN107741255B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201155991Y (en) * | 2007-12-20 | 2008-11-26 | 武汉理工大学 | Optical fibre grating acceleration sensor |
| CN104197999A (en) * | 2014-09-26 | 2014-12-10 | 哈尔滨工业大学 | Optical fiber multiphase flowmeter |
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| Publication number | Publication date |
|---|---|
| CN107741255B (en) | 2019-10-08 |
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Address after: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Applicant after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Applicant after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE SPECIAL EQUIPMENT INSPECTION STATION Co.,Ltd. Address before: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Applicant before: HEFEI GENERAL MACHINERY Research Institute Applicant before: Special Equipment Inspection Station of Hefei General Machinery Research Institute |
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Effective date of registration: 20240407 Address after: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Country or region after: China Address before: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee before: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Country or region before: China Patentee before: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE SPECIAL EQUIPMENT INSPECTION STATION Co.,Ltd. |