CN108663145A - The quasi- profile fiber pressure sensor of sensitizing type - Google Patents
The quasi- profile fiber pressure sensor of sensitizing type Download PDFInfo
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- CN108663145A CN108663145A CN201810865498.6A CN201810865498A CN108663145A CN 108663145 A CN108663145 A CN 108663145A CN 201810865498 A CN201810865498 A CN 201810865498A CN 108663145 A CN108663145 A CN 108663145A
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- 230000001235 sensitizing effect Effects 0.000 title claims abstract description 44
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/247—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet using distributed sensing elements, e.g. microcapsules
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
Abstract
Temperature-insensitive is multiplexed the invention discloses a kind of, forced area, measurement sensitivity, measurement range are adjustable, of low cost, and performance is stablized, the quasi- profile fiber pressure sensor of sensitizing type being easily changed.The pressure sensor includes pressure panels, winds elastic cylinder, reference optical fiber fixing groove, bottom shell, limit telescopic bar, the fiber adapter of optical fiber；The elastic cylinder of the winding optical fiber is located in bottom shell；The pressure panels are located above the elastic cylinder of winding optical fiber；It is provided with rectangular through-hole among the elastic cylinder of the winding optical fiber；It is provided with reference optical fiber in the reference optical fiber fixing groove；It is provided with sensor fibre on the elastic cylinder of the winding optical fiber；The reference optical fiber is electrically connected with fiber adapter with the input of sensor fibre with output end；The limit telescopic bar is arranged between pressure panels and bottom shell.Scientific research, the gauge checks such as power plant, Fuel Gas Plant can be applied to using pressure sensor.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, especially a kind of quasi- profile fiber pressure sensor of sensitizing type.
Background technology
It is well-known：With the rapid development of science and technology, the electronic scale made by pressure sensor is also widely
All trades and professions are applied to, realize the fast and accurately weighing to pressure, however institute is widely used based on electromagnetic technique at present
Pressure sensor stringent, the environment of complicated condition that is dfficult to apply to such as power plant, substation, oil/gas well, chemical plant requirement
In.Since fibre optical sensor has high sensitivity, small, electrical insulating property is good, high temperature resistant, electromagnetism interference, bandwidth, can be real
The advantages that existing uncharged full photosensitiveness probe.It is raw that optical fiber sensing technology is widely used in forceful electric power magnetic environment and oil, gas, chemical industry etc.
Produce merchandising location.Electromagnetic technique can effectively be overcome by efficiently using the pressure sensor that this class feature of fibre optical sensor is developed
The deficiency of pressure sensor provides strong support for Accelerating The Construction intelligence chemical plant, oil/gas well, power station.
The fibre optic compression sensor of most study can be divided mainly into Fabry-Perot interference formula and fiber Bragg grating type at present.
Both fibre optic compression sensors all have higher sensitivity, and the preferable linearity, however Fabry-Perot-type cavity is to environment
Humidity, purity requirements it is higher, rugged environment condition can not be adapted to, and cost of manufacture and required precision are all very high, it is more difficult to
Realize quasi- distribution and large-scale use.Fiber Bragg grating type pressure sensor is primarily present that measurement range is smaller, and temperature is affected
The problem of.
Invention content
Technical problem to be solved by the invention is to provide a kind of to temperature-insensitive, multiplexing, forced area, measurement
Sensitivity, measurement range are adjustable, of low cost, and performance is stablized, the quasi- profile fiber pressure sensor of sensitizing type being easily changed.
The technical solution adopted by the present invention to solve the technical problems is：The quasi- profile fiber pressure sensor of sensitizing type, packet
Elastic cylinder, reference optical fiber fixing groove, bottom shell, limit telescopic bar, the fiber adapter for including pressure panels, winding optical fiber；
The elastic cylinder of the winding optical fiber is located in bottom shell；The pressure panels are located at the elastic of winding optical fiber
Above body；It is provided with rectangular through-hole among the elastic cylinder of the winding optical fiber；The upper surface of the bottom shell and pressure
The lower surface of panel is both provided with and the matched boss of rectangular through-hole；It is provided with reference optical fiber in the reference optical fiber fixing groove；
It is provided with sensor fibre on the elastic cylinder of the winding optical fiber；The fiber adapter is arranged in bottom shell；The ginseng
Optical fiber is examined to be electrically connected with fiber adapter with the input of sensor fibre with output end；The limit telescopic bar is arranged in pressure face
Between plate and bottom shell.
Preferably, the material of the elastic cylinder can be one kind in rubber, silica gel, resin elasticity material.
Further, the fibre optic compression sensor includes one or more pressure panels, winds the elasticity of optical fiber
Cylinder, reference optical fiber fixing groove；And the pressure panels, the elastic cylinder for winding optical fiber, reference optical fiber fixing groove are mutually one by one
It is corresponding；It is provided with sensor fibre on the elastic cylinder of the winding optical fiber；It is provided with reference light in the reference optical fiber fixing groove
It is fine；The fiber adapter is arranged in bottom shell；The input of the reference optical fiber and sensor fibre with output end and light
Fine adapter electrical connection；The limit telescopic bar is arranged between pressure panels and bottom shell.
Specifically, the limit telescopic bar includes top mounting flange, motion bar, movable chamber, bottom mounting flange；It is described
It is provided with support column on the mounting flange of bottom；The support column is provided with movable chamber；Described motion bar one end is provided with top
Mounting flange；The motion bar other end is inserted into movable chamber, and is adapted to movable chamber.
Further, the elastic cylinder outer surface is designed with screw thread, and induction optical fiber is threadingly wrapped in damaged surface, and
One layer of silica gel is brushed on the outside of induction light.
Further, the reference optical fiber length in each reference optical fiber fixing groove is different.
The beneficial effects of the invention are as follows：The quasi- profile fiber pressure sensor of sensitizing type of the present invention has following excellent
Point：
(1) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, be used only a set of light source, photodetector,
Light path scanning system realizes the quasi- distribution measuring of multiple spot.
(2) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, it is small, light weight and cost is cheap, geometry
Shape-plastic.
(3) the quasi- profile fiber pressure sensor of sensitizing type of the present invention only needs to change different measurement demands
The pressure sensing case of dimension, it is convenient and efficient without needing to change other devices such as light source, photodetector.
Further in use, it has the following advantages：
(4) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, it is active to be separated from each other design with passive device
Telemeasurement, which not only may be implemented, to work under strong electromagnetic, inflammable and explosive, hot humid environment.
(5) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, during use in pressure sensing case
Portion is provided with temperature-compensating measure, can reduce influence of the temperature change to measurement data.
(6) the quasi- profile fiber pressure sensor of sensitizing type proposed by the present invention, can be effective using push-pull type scanning system
It improves the utilization rate of scanning mirror displacement distance and facilitates the fibre optic compression sensor for distinguishing two different regions.
Description of the drawings
Fig. 1 is the stereogram of the quasi- profile fiber pressure sensor of sensitizing type in the embodiment of the present invention；
Fig. 2 is in the embodiment of the present invention for limit telescopic rod sectional view；
Fig. 3 is quasi- profile fiber pressure sensor fractionation structural representation in the embodiment of the present invention；
Fig. 4 is the measuring system figure of the quasi- profile fiber pressure sensor of sensitizing type in the embodiment of the present invention；
It is indicated in figure：1- broad spectrum light sources；2- photodetectors；3- fiber couplers；41- senses light path input optical fibre；
42- reference path input optical fibres；43- senses light path output optical fibre；44- reference path output optical fibres；5-1 × n fiber optic splitters；
The quasi- profile fiber pressure sensor of 6- sensitizing types；7- double mirrors；8- optical fiber GRIN Lens；9- scanning shift platforms；10- is pushed away
Pull light path scanning system, 11- pressure panels；12- winds the elastic cylinder of optical fiber；13- reference optical fiber fixing grooves；The bottoms 14-
Shell；15- limit telescopic bars；16- fiber adapter；Mounting flange at the top of 17-；18- motion bars；19- movable chambers；The bottoms 20-
Mounting flange.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1 to Figure 3, the quasi- profile fiber pressure sensor of sensitizing type of the present invention, including pressure panels 11,
Wind elastic cylinder 12, reference optical fiber fixing groove 13, bottom shell 14, limit telescopic bar 15, the fiber adapter 16 of optical fiber；
The elastic cylinder 12 of the winding optical fiber is located in bottom shell 14；The pressure panels 11 are located at winding optical fiber
12 top of elastic cylinder；It is provided with rectangular through-hole among the elastic cylinder 12 of the winding optical fiber；The bottom shell 14 it is upper
Surface and the lower surface of pressure panels 11 are both provided with and the matched boss of rectangular through-hole；In the reference optical fiber fixing groove 13
It is provided with reference optical fiber；It is provided with sensor fibre on the elastic cylinder 12 of the winding optical fiber；The fiber adapter 16 is arranged
In bottom shell 14；The reference optical fiber is electrically connected with fiber adapter 16 with the input of sensor fibre with output end；Institute
Limit telescopic bar 15 is stated to be arranged between pressure panels 11 and bottom shell 14.
Specifically, pressure is born at 11 top of pressure panels, and by pressure transmission to the elastic cylinder 12 of winding optical fiber, winding
It is provided with rectangular through-hole among the elastic cylinder 12 of optical fiber, coordinates the rectangular boss at 13 top of 11 bottom of pressure panels and bottom shell
Three is locked, avoids rotating the measurement of pressure sensor is impacted.Reference optical fiber fixing groove 13 is provided in bottom shell
For placing reference optical fiber, and then reduce temperature error.Reference optical fiber and be wrapped on elastic cylinder sensor fibre input with
Output end is connect with fiber adapter 16.Pressure panels 11 are fixedly connected with bottom shell 13 and play guarantor by limit telescopic bar 15
The internal light path sensor-based system effect of shield, and pressure panels 11 is made to generate slight squeeze to the elastic cylinder 12 for winding optical fiber, it plays
The fixed effect with enhanced sensitivity.
During application：
The measuring system of the quasi- profile fiber pressure sensor of the sensitizing type includes：Broad spectrum light source 1, pushes away photodetector 2
It is the quasi- profile fiber pressure sensor 6 of pull light path scanning system 3, fiber coupler 4,1 × n optical fiber splitters 5, sensitizing type, double
Face speculum 7；Optical fiber GRIN Lens 8；Scanning shift platform 9；Specific attachment structure schematic diagram, as shown in Figure 4.
The broad spectrum light source 1, push-pull type light path scanning system 3, sensing light path input optical fibre 41 and 1 × n optical fiber
Splitter 5 is sequentially connected；
The broad spectrum light source 1, push-pull type light path scanning system 3, reference path input optical fibre 42 and 1 × n optical fiber
Splitter 5 is sequentially connected；
The photodetector 2, push-pull type light path scanning system 3, sensing light path input optical fibre 41 and 1 × n optical fiber
Splitter 5 is sequentially connected；
The photodetector 2, push-pull type light path scanning system 3, reference path input optical fibre 42 and 1 × n optical fiber
Splitter 5 is sequentially connected；
The quasi- profile fiber pressure sensor of sensitizing type 6 is connected on every fiber optic splitter of 1 × n optical fiber splitters 5；
The sensing light path output optical fibre and 1 × n optical fiber splitter of the quasi- profile fiber pressure sensor of the sensitizing type 6
5 connections；Then the reference path output optical fibre 44 of 1 × n optical fiber splitters 5 successively with optical fiber GRIN Lens 8, scanning shift platform
9 connections, final directive double mirror 7；
The reference path output optical fibre and 1 × n optical fiber splitter of the quasi- profile fiber pressure sensor of the sensitizing type 6
5 connections；Then the sensing light path output optical fibre 43 of 1 × n optical fiber splitters 5 connects with optical fiber GRIN Lens 8, scanning shift platform 9
It connects, final directive double mirror 7.
A kind of quasi- profile fiber pressure sensor of sensitizing type, it is characterised in that：The wide spectrum that the system uses
Light source is one kind in LED light source, SLD light sources, ASE light sources.
Specifically, the push-pull type light path scanning system 10 is by double mirror 7, optical fiber GRIN Lens 8, scanning position
Moving stage 9 is constituted.
Specifically, the configuration design of the quasi- profile fiber pressure sensor of the sensitizing type 6 can be rectangular configuration, rectangular knot
Structure, cylindrical structure or other shapes structure.
Specifically, the material of the elastic cylinder 12 can be one in rubber, silica gel, resin elastomeric material
Kind.The different model elastic cylinder 12 can according to demands such as the range of testing pressure, required sensitivity, forced areas and
It formulates.Depending on the fiber lengths for being wound in elastic cylinder 12 can be according to measurement demand.Further, 1 × n light
Fine beam splitter 5 can be integrated in inside the quasi- profile fiber pressure sensor of sensitizing type 6.
The measuring system of the quasi- profile fiber pressure sensor of the sensitizing type introduces push-pull type light path scanning system 10, i.e., will pass
The output of photosensitive road and reference path is connected on the both ends of scan table respectively, is beaten two-way beam orthogonal using optical fiber GRIN Lens
It, will be in backtracking to respective light path by reflection effect two-beam on the two sides of duplex scanning mirror.The introducing of the structure can
Effectively to substitute optical fiber faraday rotation mirror, sensor cost is reduced.
The light that broad spectrum light source is sent out respectively enters the distribution of sensitizing type quasi- by fiber coupler and 1 × n optical fiber splitters 5
Sensing light paths and reference path at different levels in fibre optic compression sensor 6, by 1 × n optical fiber splitters 5 by sensing light paths at different levels with
The emergent light of reference path is respectively synthesized the two sides that biplane speculum is output to for light beam and by optical fiber GRIN Lens
And it is detected by photodetector after being reflected back respective light path.Since reference path light path at different levels is different, pass through double flat
Face speculum continually scans for, and a series of corresponding interference fringes can be detected from photodetector.When there is pressure effect
Corresponding elastic cylinder deforms upon when pressure panels, makes to be wrapped in the sensing light path light path on elastic cylinder and becomes
Change, corresponding interference fringe is made to move, quasi- distribution pressure may be implemented in the displacement distance by reading interference fringe at different levels
Power measures.
The quasi- profile fiber pressure sensor of sensitizing type proposed by the present invention based on optical fiber white light interference principle mainly according to
According to the linear relationship of the pressure and white-light fringe displacement distance born in pressure panels, the measurement of pressure is realized with this.
The measurement method in order to better understand, we for duplex scanning mirror scanning displacement distance X with individually wait pressing
The linear relationship of power, which is made, to be explained in detail and illustrates.
When applying pressure to the elastic cylinder 12 in sensing light path, 12 lateral expansion of elastic cylinder is wrapped in
Optical fiber on elastic is generated stretching by axial force, and the light path for sensing light path is caused to increase, to make sensing light path and ginseng
The light path for examining light path is again at equivalent state, and duplex scanning mirror moves the distance of X to sensing optical path direction.
If being wrapped in the fiber-draw of elastic 12, variations in refractive index at this time.
Then：
Δ (Ln)=2X (1)
Now define：
Δ S=2X (2)
Formula 1 is merged to obtain with formula 2：
Δ S=Δs (nL)=n Δ L+L Δs n (3)
The stretching of optical fiber can consider optical fiber only by axial strain εz, to which Δ L can be expressed as:
Δ L=L εz (4)
The variation of refractive index can be expressed as：
By formula 4, formula 5 substitutes into formula 3：
Here,Indicate the equivalent refractive index of optical fiber.For silica-base material, in wave
At long λ=1300nm, parameter n=1.46, ν=0.25, ρ11=0.12, ρ12=0.27.It can be calculated using these data equivalent
Refractive index is ne=1.19.
4 substitution formula 6 of formula can be obtained：
Δ S=neΔL (7)
If axial compressive force m suffered by elastic cylinder and its perimeter C has linear relationship C=f (m) in a certain range, then twine
The fiber-draw being wound on elastic cylinder：
Δ L=[f (m)-f (0)] a (8)
Wherein a is that the sensor fibre that length is L is wrapped in the number of turns on the elastic of (0) Zhou Changwei f：
By formula 2, formula 8,9 substitution formula 7 of formula can obtain the pass of elastic pressure m and duplex scanning mirror displacement distance X
It is formula：
Therefore, according to formula 10, we can obtain testing pressure by duplex scanning mirror displacement distance X.
It for using multiple pressure sensing light paths, is attached using 1 × n optical fiber splitters, and each light
The sensing light path of fine pressure sensor inside is in increasing trend with the absolute value of the difference of reference path light path, to realize each confession
The differentiation of interference of light striped realizes that quasi- distribution pressure measures.
In conclusion the quasi- profile fiber pressure sensor of sensitizing type of the present invention, has the following advantages：
(1) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, be used only a set of light source, photodetector,
Light path scanning system realizes the quasi- distribution measuring of multiple spot.
(2) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, it is small, light weight and cost is cheap, geometry
Shape-plastic.
(3) the quasi- profile fiber pressure sensor of sensitizing type of the present invention only needs to change different measurement demands
The pressure sensing case of dimension, it is convenient and efficient without needing to change other devices such as light source, photodetector.
Further in use, it has the following advantages：
(4) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, it is active to be separated from each other design with passive device
Telemeasurement, which not only may be implemented, to work under strong electromagnetic, inflammable and explosive, hot humid environment.
(5) the quasi- profile fiber pressure sensor of sensitizing type of the present invention, during use in pressure sensing case
Portion is provided with temperature-compensating measure, can reduce influence of the temperature change to measurement data.
(6) the quasi- profile fiber pressure sensor of sensitizing type proposed by the present invention, can be effective using push-pull type scanning system
It improves the utilization rate of scanning mirror displacement distance and facilitates the fibre optic compression sensor for distinguishing two different regions.
Reduce cost to simplify structure, specifically, the material of the elastic cylinder 12 can be rubber, silica gel,
One kind in resin elasticity material.
In order to improve measurement accuracy, the interference to measurement of extraneous factor is avoided, further, the optical fiber pressure passes
Sensor includes one or more pressure panels 11, the elastic cylinder 12 for winding optical fiber, reference optical fiber fixing groove 13；And the pressure
Power panel 11, the elastic cylinder 12 for winding optical fiber, reference optical fiber fixing groove 13 mutually correspond；The elasticity of the winding optical fiber
It is provided with sensor fibre on cylinder 12；It is provided with reference optical fiber in the reference optical fiber fixing groove 13；The fiber adapter 16
It is arranged in bottom shell 14；The input of the reference optical fiber and sensor fibre is electrically connected with fiber adapter 16 with output end
It connects；The limit telescopic bar 15 is arranged between pressure panels 11 and bottom shell 14.
In order to simplify structure, and convenient for the flexible limit of limit telescopic bar 15, specifically, the limit telescopic bar 15 wraps
Include top mounting flange 17, motion bar 18, movable chamber 19, bottom mounting flange 20；It is provided on the bottom mounting flange 20
Support column；The support column is provided with movable chamber 19；18 one end of the motion bar is provided with top mounting flange 17；The work
18 other end of lever is inserted into movable chamber 19, and is adapted to movable chamber 19.
For the ease of fixation of the optical fiber on elastic cylinder 12, further, 12 outer surface of the elastic cylinder is designed with
Screw thread, induction optical fiber is threadingly wrapped in damaged surface, and brushes one layer of silica gel on the outside of induction light.
For quasi- distribution measuring, to realize that interference fringe must be distinguished, further, each reference optical fiber fixing groove 13
In reference optical fiber length it is different.Fiber lengths inside fibre optic compression sensor in each reference optical fiber fixing groove are not
Together, specific length difference can be depending on measurement demand.
Embodiment
The present invention constructs a kind of fibre optic compression sensor realized using optical fiber white light interference principle.In the process of application
The middle measuring system using the quasi- profile fiber pressure sensor of corresponding sensitizing type, the measuring system include broad spectrum light source 1, light
Electric explorer 2, push-pull type light path scanning system 10, fiber coupler 3,1 × n optical fiber splitters 5, pressure sensing case constitute 6, such as
Shown in Fig. 4, wherein push-pull type light path scanning system is by scanning shift platform 9, duplex scanning mirror 7, the composition of optical fiber GRIN Lens 8.
The quasi- profile fiber pressure sensor 6 of sensitizing type includes pressure panels 11, winds elastic cylinder 12, the reference light of optical fiber
Fine fixing groove 13, limit telescopic bar 15, fiber adapter 16, bottom shell 14；Bear pressure, elastic in 11 top of pressure panels
Body 12 is pressure enhanced sensitivity device, is wound in the optical fiber on elastic cylinder as sensing light path, bottom shell is interior to be equipped with reference optical fiber
Fixing groove 13 can with fixed reference light path optical fiber, the input of sensor fibre light path and reference optical fiber light path and output end with installation
Fiber adapter 16 on bottom package shell connects, pressure panels 11 and bottom shell 14 by the gag lever post 15 that stretches connect into
And entire internal pressure sensor-based system is fixed and protected.
The pressure panels 11 with bottom shell 14 of fibre optic compression sensor 6 are formed by 3D printing in the present embodiment.Elastic
Body 12 is cast by mold silica gel, and specific production method is：
(1) it is 80mm that radius is made by way of 3D printing, and height 30mm, for inner wall with spiral groove, center is side
The casting die of long 30mm square columns；
(2) releasing agent is coated uniformly on inside casting die, pours into the mold silica gel mixed up, after its solidification completely i.e.
Required elastic cylinder can be obtained；
(3) single mode optical fiber of 2m long is wrapped in the spiral groove of elastic cylinder, optical fiber is avoided mutually to squeeze；
(4) elastic rubber outer surface of column is brushed with identical mold silica gel again, to which optical fiber to be fixed
With protection.
The measurement process of the present embodiment is：
(1) each device is connected according to design light path；
(2) system initialization；
(3) method for using light path scanning is believed by a series of white light interferences that continually scan for obtaining of duplex scanning mirror 7
Number, and the initial position for recording each white-light fringe center primary maximum is a1, a2, a3 ... an.
(4) pressure is applied to the center of pressure panels 11, the method for using light path scanning again after the system stabilizes,
It obtains a series of white light interference signals and marks the position of central primary maximum interference fringe at this time to be b1, b2, b3 ... bn；
(5) gradually increase pressure and the displacement distance of recording interference fringe, obtain pressure and moving interference fringes distance
Linear relationship, to be demarcated, you can measured to be measured.
It is 0.05N, maximum inspection for the minimum detection pressure in the single point pressure the data obtained range of linearity in the present embodiment
Measuring pressure is 1000N, and resolution ratio is 0.05N/ μm.
The present invention provides a kind of quasi- profile fiber pressure sensor of sensitizing type based on optical fiber white light interference principle, the pressures
Force snesor can not only work under strong electromagnetic and inflammable and explosive environment, also have to temperature-insensitive, multiplexing,
Forced area, measurement sensitivity, measurement range are adjustable, of low cost, and performance is stablized, the advantages of being easily changed.It can be applied to section
Learn the gravity measurement to anisotropic quantity of material in research, the oil such as power plant, Fuel Gas Plant, gas, the metering of Chemical Manufacture merchandising location
Detection.
Claims (6)
1. the quasi- profile fiber pressure sensor of sensitizing type, it is characterised in that：Elastic including pressure panels (11), winding optical fiber
Body (12), reference optical fiber fixing groove (13), bottom shell (14), limit telescopic bar (15), fiber adapter (16)；
The elastic cylinder (12) of the winding optical fiber is located in bottom shell (14)；The pressure panels (11) are located at winding optical fiber
Elastic cylinder (12) above；It is provided with rectangular through-hole among the elastic cylinder (12) of the winding optical fiber；The bottom shell
(14) lower surface of upper surface and pressure panels (11) is both provided with and the matched boss of rectangular through-hole；The reference optical fiber
It is provided with reference optical fiber in fixing groove (13)；It is provided with sensor fibre on the elastic cylinder (12) of the winding optical fiber；The light
Fine adapter (16) is arranged in bottom shell (14)；The input of the reference optical fiber and sensor fibre with output end and optical fiber
Adapter (16) is electrically connected；The limit telescopic bar (15) is arranged between pressure panels (11) and bottom shell (14).
2. the quasi- profile fiber pressure sensor of sensitizing type as described in claim 1, it is characterised in that：The elastic cylinder
(12) material can be one kind in rubber, silica gel, resin elasticity material.
3. the quasi- profile fiber pressure sensor of sensitizing type as described in claim 1, it is characterised in that：The optical fiber pressure passes
Sensor includes one or more pressure panels (11), the elastic cylinder (12) for winding optical fiber, reference optical fiber fixing groove (13)；And
The pressure panels (11), the elastic cylinder (12) for winding optical fiber, reference optical fiber fixing groove (13) mutually correspond；It is described to twine
It is provided with sensor fibre on the elastic cylinder (12) of optical fiber；It is provided with reference optical fiber in the reference optical fiber fixing groove (13)；
The fiber adapter (16) is arranged in bottom shell (14)；The input of the reference optical fiber and sensor fibre and output end are equal
It is electrically connected with fiber adapter (16)；The limit telescopic bar (15) setting pressure panels (11) and bottom shell (14) it
Between.
4. the quasi- profile fiber pressure sensor of sensitizing type as described in claim 1, it is characterised in that：The limit telescopic bar
(15) include top mounting flange (17), motion bar (18), movable chamber (19), bottom mounting flange (20)；The bottom is fixed
Flange is provided with support column on (20)；The support column is provided with movable chamber (19)；Described motion bar (18) one end is provided with
Top mounting flange (17)；Motion bar (18) other end is inserted into movable chamber (19), and is adapted to movable chamber (19).
5. the quasi- profile fiber pressure sensor of sensitizing type as described in claim 1, it is characterised in that：The elastic cylinder (12)
Outer surface is designed with screw thread, and induction optical fiber is threadingly wrapped in damaged surface, and brushes one layer of silica gel on the outside of induction light.
6. the quasi- profile fiber pressure sensor of sensitizing type as claimed in claim 3, it is characterised in that：Each reference optical fiber is fixed
Reference optical fiber length in slot (13) is different.
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| CN114370927A (en) * | 2022-01-12 | 2022-04-19 | 福州大学 | Differential pressure type optical fiber hydrophone sensing element |
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| CN114674349A (en) * | 2022-03-14 | 2022-06-28 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbend |
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