CN105806547B - Blade damp type optical fiber differential pressure sensor-based system and its detection method - Google Patents
Blade damp type optical fiber differential pressure sensor-based system and its detection method Download PDFInfo
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- CN105806547B CN105806547B CN201610363276.5A CN201610363276A CN105806547B CN 105806547 B CN105806547 B CN 105806547B CN 201610363276 A CN201610363276 A CN 201610363276A CN 105806547 B CN105806547 B CN 105806547B
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- optical fiber
- partition board
- reception
- rotation section
- differential pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention provides a kind of blade damp type optical fiber differential pressure sensor-based system and its detection method, rotation section is provided in housing, the opposite sides of rotation section is both provided with partition board, the inner cavity of housing is divided into two test chambers by rotation section and partition board, two test chambers are correspondingly arranged on detection fluid inlet, the side of one partition board is provided with damping spring, one end of damping spring is fixed, the other end is fixed on the partition board, through-hole is offered along the center of rotation of rotation section, anti-dazzling screen is fixedly installed in through-hole, the side of anti-dazzling screen is provided with incident optical, opposite side is provided with reception optical fiber, and the reception end face of reception optical fiber is divided into optical fiber receiving part and non-optical fiber receiving part.To solve that existing differential pressure pick-up practicability is not strong, limitation is larger or still in the concept phase, use can not be promoted, and relatively conventional resistance-type, capacitance differential pressure transducer be there is also the shortcomings that itself, the problem of in many occasions and not applying to, actual pressure differential measurement request can not be met.The invention belongs to pressure differential detection fields.
Description
Technical field
The present invention relates to a kind of sensor-based systems, belong to technical field of optical fiber sensing.
Background technology
Differential pressure pick-up is widely used in industry, is mainly used for the pressure of device measuring, component or fluid in different location
Force difference is widely used in the detection fields such as tail gas pressure difference, gas flow, height of liquid level, clean room monitoring.Now, occurred
Using the differential pressure pick-up of different principle, such as resistance-type, condenser type, inductance type, flow controller formula, magnetic liquid formula, MEMS formulas
Deng, wherein resistance-type, condenser type is relatively conventional, remaining type since practicability is not strong, limitation is larger or still in the concept phase,
It is not promoted, but resistance-type, capacitance differential pressure transducer cannot win well in many occasions there is also the shortcomings that itself
Appoint.Based on this, the present invention proposes a kind of novel fiber optic bundle differential pressure pick-up probe.
Invention content
It is an object of the invention to：A kind of blade damp type optical fiber differential pressure sensor-based system and its detection method are provided, with solution
Certainly existing differential pressure pick-up practicability is not strong, limitation is larger or still in the concept phase, can not be promoted uses, and more normal
The resistance-type seen, capacitance differential pressure transducer in many occasions and do not apply to there is also the shortcomings that itself, can not meet practical pressure
The problem of difference measurements require.
The solution of the present invention is as follows：A kind of blade damp type optical fiber differential pressure sensor-based system, including probe, photoelectric converter and
Signal processing system, probe include housing, rotation section are provided in housing, the shaft of rotation section is equal with the center line of housing
Row, the two are non-coaxial structure, i.e. relative eccentric, the opposite sides of rotation section is both provided with partition board, and partition board can be with rotation section
It is relatively rotated in housing, the inner cavity of housing is divided into two test chambers by rotation section and partition board, and two test chambers correspondence is set
Detection fluid inlet is equipped with, the side of a partition board is provided with damping spring, and one end of damping spring is fixed, and the other end is fixed on this
On partition board, through-hole is offered along the center of rotation of rotation section, anti-dazzling screen is fixedly installed in through-hole, the side of anti-dazzling screen is provided with
Incident optical, opposite side is provided with reception optical fiber, and the reception end face of reception optical fiber is divided into optical fiber receiving part and non-optical fiber receives
Portion, reception optical fiber are connected with photoelectric converter, and photoelectric converter is connected with signal processing system；
The sensing system further includes light source, Y types coupler and optical fiber, and light source is set to one end of optical fiber for generating light
Optical fiber signaling, the other end of optical fiber are divided into incident optical and reference optical fiber after the coupling of Y types coupler, and incident optical is set to shading
The side of piece, reference optical fiber is connected individually to a photoelectric converter, and photoelectric converter is connected with signal processing system, connects
The optical signal of optical fiber and reference optical fiber is received after opto-electronic conversion, then filtered, rectification and signal is carried out by signal processing system
Analyzing and processing.
The reception end face of reception optical fiber can by blocking parts carry out partial occlusion to form non-optical fiber receiving part, not by
The part blocked is that only partly there are optical fiber for the reception end face of optical fiber receiving part or reception optical fiber, then there are the portions of optical fiber
It is optical fiber receiving part to divide, and the part without optical fiber is non-optical fiber receiving part；
When detecting fluid pressure difference, after fluid flows into two test chambers, rotation section, which rotates, drives anti-dazzling screen rotation, so as to hide
Mating plate blocks position and changes, and the variation of signal is received by optical fiber receiving part in reception optical fiber and can extrapolate rotation section
Rotational angle, so that force size of the damping spring to partition board can be extrapolated, and then extrapolate two detection cavity fluids
Pressure difference；
The position that rotation section corresponds to partition board is provided with sliding slot, and one end of partition board is slideably positioned in corresponding sliding slot,
Pressure is equipped with spring between partition board and the bottom of sliding slot where it, and the other end of partition board held out against to the inner wall of housing, and partition board with
It is slidingly sealed between the inner wall of housing；
The damping spring is the stronger damping spring of rigidity, under free state, i.e. without fluid stream in two test chambers
Enter or two test chambers in fluid pressure it is identical when, the shape of damping spring becomes zero, and damping spring and corresponding partition board are perpendicular,
Salient point is provided at the inner wall of housing, one end of the damping spring is fixed on the salient point；
The through-hole, incident optical and reception optical fiber coaxial arrangement；
Detection fluid inlet is also correspondingly arranged on strainer；
The cross-sectional outer diameter of the reception optical fiber is identical with the internal diameter of through-hole, and the anti-dazzling screen is equal with the end face of reception optical fiber
Row, anti-dazzling screen is semicircular structure, and the diameter of anti-dazzling screen is identical with the internal diameter of through-hole, optical fiber receiving part and non-optical fiber receiving part
Be semicircular structure, and the two axial symmetry is set, i.e., the reception end face half of reception optical fiber can reception optical fiber signal, it is another
Half can not reception optical fiber signal, under original state, i.e. in two test chambers without fluid flow into or two test chambers in fluid pressure
When identical, the shield portions of anti-dazzling screen coincide just with non-optical fiber receiving part；
Housing has cylindrical cavity, and under original state, the rotary centerline of rotation section and the center line of housing cavity are equal
Same plane is in partition board；
To ensure that structure is more compact, space availability ratio higher, housing uses flat tubular construction；
Utilize the method for above-mentioned fiber optic bundle differential pressure sensor-based system detection fluid pressure difference
Fluid flows into two test chambers by detection fluid inlet respectively, if there are pressure between two detection cavity fluids
Difference, then the center of rotation in rotation section and the partition board relative rotation portion of rotation section opposite sides rotate, and be set to one every
Reach balance under the action of the damping spring of plate side, anti-dazzling screen also rotates during rotation, and makes anti-dazzling screen both sides
The optical fiber reception amount of reception optical fiber changes in the incident optical and the output optical fiber that are correspondingly arranged, and anti-dazzling screen is obtained so as to calculate
Rotational angle, i.e. rotation section rotational angle, so as to extrapolate force situation of the damping spring to partition board, and then calculate
Go out the pressure difference of two detection cavity fluids.
Compared with prior art, the present invention major advantage is as follows：It can by structure design, theoretical research and experimental analysis
Know, which has many advantages, such as smaller structure, higher accuracy and reliability, well adapting to property and interchangeability, real
Extremely strong with property, output signal output valve after opto-electronic conversion and signal processing calculate will change at double, so as to improve detection spirit
Sensitivity, the sensor can be suitably used for numerous pressure differential detection occasions.
Meanwhile the differential pressure pick-up uses rotational structure as pressure detection device, when encountering Fluid pressure, rotation
Portion and diaphragm excursion movement, it is only necessary to pressure differential can be calculated according to the deviation angle of rotation section, the requirement for Fibre Optical Sensor
It is lower, measure and calculate it is more simple, and detection be not easy, by external interference, to be hardly damaged, service life is more permanent so that pass
Reliability, adaptability and the interchangeability of sensor have compared with much progress, are suitable for use as the measurement of fluid differential pressure；The intensity of sensor
Compensation principle is more simple, and practicability is stronger.
Description of the drawings
Fig. 1 is the schematic diagram of the sensor-based system；
Fig. 2 is the sectional view popped one's head in the sensor-based system；
Fig. 3 be in the Fig. 2 A-A to sectional view；
Fig. 4 is optical fiber designs figure, wherein, a is the structure diagram of incident optical incident end face, and b is barn door
Structure diagram, c are the structure diagrams that reception optical fiber receives end face；
The functional image of Fig. 5 pressure differences and luminous flux.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below with reference to accompanying drawings
Step ground detailed description,
Embodiment：
Referring to figs. 1 to Fig. 4, the present embodiment provides a kind of blade damp type optical fiber differential pressure sensor-based system, including probe 1, light
Electric transducer 2 and signal processing system 3, signal processing system 3 include rectification circuit, filter circuit and computer (processor),
Probe 1 includes housing 11, and housing 11 uses flat tubular construction, and housing 11 has cylindrical cavity, is set in housing 11
There is rotation section 12, the shaft of rotation section 12 is parallel with the center line of housing 11, and the two is non-coaxial structure, i.e. relative eccentric,
The opposite sides of rotation section 12 is both provided with partition board 13, and partition board 13 can be relatively rotated with rotation section 12 in housing 11, initially
Under state, the center line of 11 inner cavity of rotary centerline and housing of rotation section 12 is in same plane with partition board 13, specially：
The position that rotation section 12 corresponds to partition board 13 is provided with sliding slot 121, and one end of partition board 13 is slideably positioned in corresponding sliding slot 121
Interior (being slidingly sealed between partition board 13 and sliding slot 121), pressure is equipped with spring 19 between partition board 13 and the bottom of sliding slot 121 where it,
The other end of partition board 13 is held out against to the inner wall of housing 11, and is slidingly sealed between the inner wall of partition board 13 and housing 11, housing 11
Inner cavity is divided into two test chambers by rotation section 12 and partition board 13, and two test chambers are correspondingly arranged on detection fluid inlet 14,
Strainer 141 is also correspondingly arranged at detection fluid inlet 14；
The side of one of partition board 13 is provided with damping spring 15, and salient point 111 is provided at the inner wall of housing 11, damping
One end of spring 15 is fixed on the salient point 111, and the other end is fixed on partition board 13, and damping spring 15 is the stronger damping of rigidity
Spring, under free state, i.e. in two test chambers without fluid flow into or two test chambers in fluid pressure it is identical when, damping spring
15 shape becomes zero, and damping spring 15 and corresponding partition board 13 are perpendicular；
Through-hole 122 is offered along the center of rotation of rotation section 12, anti-dazzling screen 16, anti-dazzling screen are fixedly installed in through-hole 122
16 side is provided with incident optical 17, and opposite side is provided with reception optical fiber 18, and the reception end face of reception optical fiber 18 is divided into light
Fine receiving part 181 and non-optical fiber receiving part 182, reception optical fiber 18 are connected with photoelectric converter 2, at photoelectric converter 2 and signal
Reason system 3 is connected, which further includes light source 4, Y types coupler 5 and optical fiber 6, light source 4 and be set to one end of optical fiber 6
For generating fiber-optic signal, the other end of optical fiber 6 is divided into incident optical 17 and reference optical fiber 61 after the coupling of Y types coupler 5, enters
The side that optical fiber 17 is set to anti-dazzling screen 16 is penetrated, reference optical fiber 61 is connected individually to a photoelectric converter 2, and photoelectric converter
2 are connected with signal processing system 3, and the optical signal of reception optical fiber 18 and reference optical fiber 61 is then filtered, whole after opto-electronic conversion
It flows and signal is analyzed and processed by signal processing system 3.
Through-hole 122, incident optical 17 and reception optical fiber 18 are coaxially disposed, cross-sectional outer diameter and the through-hole 122 of reception optical fiber 18
Internal diameter it is identical, the anti-dazzling screen 16 is parallel with the end face of reception optical fiber 18, and anti-dazzling screen 16 is semicircular structure, and anti-dazzling screen
16 diameter is identical with the internal diameter of through-hole 122, and optical fiber receiving part 181 and non-optical fiber receiving part 182 are semicircular structure, and two
Person's axial symmetry set, i.e., the reception end face half of reception optical fiber 18 can reception optical fiber signal, the other half can not reception optical fiber letter
Number, under original state, i.e. in two test chambers without fluid flow into or two test chambers in fluid pressure it is identical when, anti-dazzling screen 16
Shield portions coincide just with non-optical fiber receiving part 182；
The reception end face of reception optical fiber 18 can carry out partial occlusion to form non-optical fiber receiving part by blocking parts
182, the part not being blocked be the reception end face of optical fiber receiving part 181 or reception optical fiber 18 only partly there are optical fiber, then
Part there are optical fiber is optical fiber receiving part 181, and the part without optical fiber is non-optical fiber receiving part 182, detects fluid pressure
When poor, fluid flows into two test chambers by detection fluid inlet 14 respectively, if there are pressure difference between two detection cavity fluids,
Then the center of rotation in the 13 relative rotation portion 12 of partition board of 12 opposite sides of rotation section 12 and rotation section rotates, and be set to
Reach balance under the action of the damping spring 15 of one partition board, 13 side, anti-dazzling screen 16 also rotates during rotation, and makes
The optical fiber reception amount of reception optical fiber 18 changes in incident optical 17 and the output optical fiber 18 that 16 both sides of anti-dazzling screen are correspondingly arranged,
So as to calculate the rotational angle of the rotational angle for obtaining anti-dazzling screen 16, i.e. rotation section 12, so as to which damping spring 15 can be extrapolated
To the force situation of partition board 13, and then extrapolate the pressure difference of two detection cavity fluids.
The calculating of the sensor probe mathematical model
We set out the height value of 11 inner cavity of housing as 50mm in calculating process, radius R, 13 liang of side cavities of partition board
With pressure differential, and after reaching equilbrium position again, the variable quantity of the fiber strength that reception optical fiber 18 receives is Δ P, partition board
13 eccentricity apart from the center of housing 11 is e, and damping spring stiffness factor is k, damping spring and 12 axle center of rotation section away from
From for d, blade lateralarea (face area of 12 side partition board 13 of rotation section) is S1, lower blade lateralarea (rotation section
The face area of 12 opposite side partition boards 13) it is S2, blade length (length of one of partition board 13 shown in Fig. 1) is L1, inferior lobe
Leaf length (length of another partition board 13 shown in Fig. 1) is L2, blade deflection angle (deflection angle of partition board 13) θ, steamboat radius
(radius of rotation section 12) r2, steamboat pore radius (radius of through-hole 122) r1。
Fluid is into fashionable, and due to pressure differential, partition board generates different torques, wherein T1For the torque that fluid generates, T2For resistance
Torque is hindered to obtain formula (1)
T1-T2=dFBullet=kdx (1)
X can be obtained, and because of T=Δ P*T*L, transformation obtains (2)
So as to which variable quantity is obtained
It is known
Then
So the expression formula that can calculate thang-kng amount is：
Again
S1=50 (L1-R2) S2=50 (L2-R2) (8)
The expression formula that variation of light intensity can then be obtained is：
For ease of calculating, we take wherein R=50mm, ε=1, e=10mm, k=100d=40mm, and θ values are 0~1
Degree, θ=(0：0.1：1), due to θ angles very little, L1、L2、S1、S2It can be approximately considered constant, then enable S1=2000mm, S2=
1000mm,L1=60mm, L2=40mm, and draw (Δ P,) curve such as Fig. 5.When both sides pressure difference is 0, the light of reception leads to
It is 0 to measure, and blade (partition board 13) is in initial position at this time.And with both sides pressure difference increase when, blade balance is broken reality
It now deflects, luminous flux changes correspondingly, and with good linear relationship.
Claims (10)
1. a kind of blade damp type optical fiber differential pressure sensor-based system, including probe (1), photoelectric converter (2) and signal processing system
(3), it is characterised in that：Probe (1) includes housing (11), and rotation section (12) is provided in housing (11), and rotation section (12) turn
Axis is parallel with the center line of housing (11), and the opposite sides of rotation section (12) is both provided with partition board (13), and partition board (13) energy
It is relatively rotated in housing (11) with rotation section (12), the inner cavity of housing (11) is divided into two by rotation section (12) and partition board (13)
A test chamber, two test chambers are correspondingly arranged on detection fluid inlet (14), and the side of a partition board (13) is provided with damping bullet
Spring (15), one end of damping spring (15) are fixed, and the other end is fixed on the partition board (13), along the center of rotation of rotation section (12)
Through-hole (122) is offered, is fixedly installed anti-dazzling screen (16) in through-hole (122), the side of anti-dazzling screen (16) is provided with incident light
Fine (17), opposite side are provided with reception optical fiber (18), and the reception end face of reception optical fiber (18) be divided into optical fiber receiving part (181) and
Non- optical fiber receiving part (182), reception optical fiber (18) are connected with photoelectric converter (2), photoelectric converter (2) and signal processing system
(3) it is connected.
2. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：The sensing system
Light source (4), Y types coupler (5) and optical fiber (6) are further included, light source (4) is set to one end of optical fiber (6) for generating optical fiber letter
Number, the other end of optical fiber (6) is divided into incident optical (17) and reference optical fiber (61), incident optical after Y types coupler (5) coupling
(17) side of anti-dazzling screen (16) is set to, reference optical fiber (61) is connected individually to a photoelectric converter (2), and opto-electronic conversion
Device (2) is connected with signal processing system (3), the optical signal of reception optical fiber (18) and reference optical fiber (61) after opto-electronic conversion,
Filtered again, rectification simultaneously analyzes and processes signal by signal processing system (3).
3. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：Rotation section (12) is right
The position of partition board (13) is answered to be provided with sliding slot (121), one end of partition board (13) is slideably positioned in corresponding sliding slot (121)
Interior, pressure is equipped with spring (19) between partition board (13) and the bottom of sliding slot (121) where it, and the other end of partition board (13) is held out against to shell
At the inner wall of body (11), and it is slidingly sealed between the inner wall of partition board (13) and housing (11).
4. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：Under free state,
That is in two test chambers without fluid flow into or two test chambers in fluid pressure it is identical when, the shape of damping spring (15) becomes zero,
And damping spring (15) and corresponding partition board (13) are perpendicular, and salient point (111), the damping are provided at the inner wall of housing (11)
One end of spring (15) is fixed on the salient point (111).
5. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：The through-hole
(122), incident optical (17) and reception optical fiber (18) coaxial arrangement.
6. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：Detect fluid inlet
(14) strainer (141) is also correspondingly arranged at.
7. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：The reception optical fiber
(18) cross-sectional outer diameter is identical with the internal diameter of through-hole (122), and the anti-dazzling screen (16) is parallel with the end face of reception optical fiber (18),
Anti-dazzling screen (16) is semicircular structure, and the diameter of anti-dazzling screen (16) is identical with the internal diameter of through-hole (122), optical fiber receiving part
(181) and non-optical fiber receiving part (182) is semicircular structure, and the two axial symmetry is set, i.e. the reception of reception optical fiber (18)
End face half can reception optical fiber signal, the other half can not reception optical fiber signal, under original state, i.e. do not have in two test chambers
When fluid pressure is identical in fluid inflow or two test chambers, the shield portions of anti-dazzling screen (16) and non-optical fiber receiving part (182) phase
It overlaps.
8. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：Housing (11) has
Cylindrical cavity, under original state, the rotary centerline of rotation section (12) and the center line of housing (11) inner cavity are and partition board
(13) in same plane.
9. a kind of blade damp type optical fiber differential pressure sensor-based system according to claim 1, it is characterised in that：Housing (11) is flat
Flat tubular construction.
10. using the method for differential pressure sensor-based system detection fluid pressure difference described in any claim in claim 1-9, feature
It is, including：
Fluid flows into two test chambers by detection fluid inlet (4) respectively, if there are pressure difference between two detection cavity fluids,
Then the center of rotation in partition board (3) the relative rotation portion (2) of rotation section (2) and rotation section (2) opposite sides rotates, and setting
It is placed under the action of the damping spring (5) an of partition board (3) side and reaches balance, anti-dazzling screen (6) also occurs to turn during rotation
It is dynamic, and make the optical fiber reception of reception optical fiber (8) in incident optical (7) that anti-dazzling screen (6) both sides are correspondingly arranged and the output optical fiber (8)
Amount changes, so as to calculate the rotational angle of the rotational angle for obtaining anti-dazzling screen (6), i.e. rotation section (2), so as to calculate
Go out force situation of the damping spring (5) to partition board (3), and then extrapolate the pressure difference of two detection cavity fluids.
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| CN201610363276.5A CN105806547B (en) | 2016-05-30 | 2016-05-30 | Blade damp type optical fiber differential pressure sensor-based system and its detection method |
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| CN201610363276.5A CN105806547B (en) | 2016-05-30 | 2016-05-30 | Blade damp type optical fiber differential pressure sensor-based system and its detection method |
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| CN106500568B (en) * | 2016-12-16 | 2023-01-17 | 苏州美瑞时科技有限公司 | Adjustable height gauge measuring head |
| CN109026526B (en) * | 2018-06-28 | 2019-09-24 | 山东科技大学 | The calculation method of hydraulic air bullet pitch-controlled system and control method and control parameter based on distributed optical fiber sensing differential pressure feedback |
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| CN205655956U (en) * | 2016-05-30 | 2016-10-19 | 贵州大学 | Blade damping formula optic fibre differential pressure sensing system |
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| JP4312192B2 (en) * | 2005-11-02 | 2009-08-12 | ミネベア株式会社 | Optical displacement sensor and external force detection device |
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|---|---|---|---|---|
| US4899046A (en) * | 1985-12-24 | 1990-02-06 | Schlumberger Industries, S.A. | Optical sensor of physical magnitude |
| CN103557985A (en) * | 2013-11-04 | 2014-02-05 | 贵州大学 | Differential pressure sensing method and sensor thereof |
| CN103557984A (en) * | 2013-11-04 | 2014-02-05 | 贵州大学 | Method and structure for packaging probes of differential pressure sensor |
| CN104949793A (en) * | 2015-07-10 | 2015-09-30 | 贵州大学 | Damping type probe structure provided with single piston and used for optical fiber differential pressure sensor |
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| CN105806547A (en) | 2016-07-27 |
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