CN108663158A - Push-pull type optical fiber differential pressure pickup - Google Patents
Push-pull type optical fiber differential pressure pickup Download PDFInfo
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- CN108663158A CN108663158A CN201810865473.6A CN201810865473A CN108663158A CN 108663158 A CN108663158 A CN 108663158A CN 201810865473 A CN201810865473 A CN 201810865473A CN 108663158 A CN108663158 A CN 108663158A
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- optical fiber
- differential pressure
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- fixing device
- pull type
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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
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
-
- 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
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of to temperature-insensitive, and measurement range is adjustable, anti-strong electromagnetic, burn-proof and explosion prevention, multiplexing, remotely measures, is of low cost, the push-pull type optical fiber differential pressure pickup that performance is stablized.The push-pull type optical fiber differential pressure pickup, including fiber adapter, optical fiber GRIN Lens fixing device, plane mirror fixing device, support column, equalizer bar, driving column, encapsulating shell, elastic metallic bellows, ring flange, logical pressure conduit；It is of low cost, performance is stable, is easily changed and repairs using the push-pull type optical fiber differential pressure pickup.In use, multiple sensors can be used in conjunction with a set of broad spectrum light source, photodetector, realize the quasi- distribution measuring of multiple spot；Telemetry network can be formed with fibre-optic transmission system (FOTS), realize remote real time monitoring and measure.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, especially a kind of push-pull type optical fiber differential pressure pickup.
Background technology
It is well-known：Differential pressure pick-up is a kind of sensor being used for measuring difference between two pressure, is commonly used in
Measure the pressure difference of a certain equipment or component rear and front end.Differential pressure pick-up micro-flow measurement, leak-testing, clean room monitoring,
Many high-acruracy survey occasions such as environmental sealing detection, gas flow measurement, height of liquid level measurement, which suffer from, to be widely applied.
For example, in sealing element detection field, engine nozzle sealing propertytest, vapour are applied to differential pressure pick-up
The sealing propertytest etc. of vehicle master cylinder is studied；The field in fluid flowing research and fluid conveying engineering, differential pressure pass
It is poor that sensor can be used for the slight pressure that accurate measurement fluid flows through between 2 points；And it is accurately measured in the liquid level of liquid
In field, differential pressure pick-up can be applied to the measurement and control such as tap water water level, oil field, the oil tank of oil plant and oil storage tank
Oil-level measurement etc..
Currently, differential pressure pick-up mainly has two kinds of pressure resistance type and condenser type, the advantage that piezoresistive transducer protrudes is structure
Simply, operative end surface is smooth.But this sensor also has many deficiencies, between sensitivity and frequency response there is compared with
Contradiction outstanding, and temperature is also bigger on the influence of the performance of such sensor.Capacitance type sensor have it is simple in structure, it is sensitive
Degree is high, and dynamic response characteristic is good, and anti-overload ability is strong, adaptable to mal-conditions such as high temperature, radiation and judders etc. excellent
Point has made it a kind of promising sensor.But the shortcomings that there are problems that due to it and, it is non-thread such as output characteristics
The influence to sensitivity and measurement accuracy of property, parasitic capacitance and distribution capacity and the circuit being connect with sensor are more complicated
Deng influencing its application reliability, need to take certain compensation and corrective action, therefore limit its extensive use.
Since optical fiber sensing technology has, fire prevention, explosion-proof, precision is high, loss is low, small, light weight, long lifespan, sexual valence
Than high, durability is good, fast response time, electromagnetism interference, frequency range is wide, dynamic range is big, easily with fibre-optic transmission system (FOTS) group
Many advantages, such as at telemetry network, the differential pressure pick-up based on optical fiber sensing technology also expand corresponding research.Japan
Seiichiro KINUGASA propose a kind of optical fiber differential pressure pickup KINUGASA based on intensity modulated
Seiichiro.Fringe Amplitude Modulation Method for Differential Pressure Sensor
[C] //IEEE SENSORS, EXCO Daegu, Korea, 2006:22-25..The principle of such sensor is penetrated for incident optical
The light direct irradiation gone out on reflector, reflected light signal that reception optical fiber is received with reflector and reception optical fiber end spacing
From variation and change, thus the displacement of reflector or the size of corner can be received the power of light by detection and determined.It is this
There are two major defects for fibre optical sensor：First, the fluctuation of the intensity of light source can bring larger error to measuring, second is that reflector
The reflectivity on surface also leads to the inaccuracy measured with the variation of use environment at any time.The Hao-Jan of TaiWan, China
SHENG et al. designs a kind of differential pressure pick-up SHENG Hao-Jan, LIU Wen-Fung based on fiber bragg grating,
LIN Kuei-Ru, et al.High-sensitivity Temperature-independent Differential
Pressure Sensor using Fiber Bragg Gratings [J] .Optics Express, 2008,16 (20):
16014-16018. and applicant a kind of optical fiber differential pressure air velocity transducer Chinese patent disclosed in 2016：
201620800354.9 mainly according to fiber bragg grating stress axial strain occurs for fiber bragg grating differential pressure pick-up
To make the wavelength of output light change, the reflecting light long value by comparing two sections of gratings derives pressure difference.Due to this
Class sensor is to realize pressure measurement according to simple optical fiber axial strain, although sensitivity is very high, measurement range is smaller, and
Easy vibrated interference.
Invention content
Technical problem to be solved by the invention is to provide a kind of to temperature-insensitive, and measurement range is adjustable, anti-strong electromagnetic
The push-pull type optical fiber differential pressure pickup that interference, burn-proof and explosion prevention, multiplexing, long-range measurement, of low cost, performance are stablized.
The technical solution adopted by the present invention to solve the technical problems is：Push-pull type optical fiber differential pressure pickup, including optical fiber
Adapter, optical fiber GRIN Lens fixing device, plane mirror fixing device, support column, equalizer bar, driving column, encapsulating shell,
Elastic metallic bellows, ring flange, logical pressure conduit；
The encapsulating shell has inner cavity；The fiber adapter is arranged at the top of encapsulating shell；The optical fiber self-focusing is saturating
The top in encapsulating shell inner cavity is arranged in mirror fixing device；The fiber adapter passes through light with optical fiber GRIN Lens fixing device
Fibre connection；The support column is vertically provided at the interior intracavitary of encapsulating shell, and the lower end of the support column is located at inner cavity lower surface
Centre position；The upper end of the support column is provided with equalizer bar, and the centre position of the equalizer bar and support are column articulated；
The both sides of the support column are both provided with elastic metallic bellows；It is provided with biography at the top of the elastic metallic bellows
Dynamic column, the upper end of the driving column and one end of equalizer bar connect；The upper end of the driving column is provided with plane mirror and fixes
Device；The plane mirror fixing device is located at the underface of optical fiber GRIN Lens fixing device；
The elastic metallic ripple bottom of the tube is fixed on inner cavity lower surface by ring flange；Elastic metallic bellows bottom
Portion is provided with logical pressure conduit.
Further, the plane mirror fixing device include stud, angle modulation screw, rubber ring, plane mirror with
And upper mounting plate and lower installation board；
The stud is arranged at the top of upper mounting plate；The rubber ring is arranged between upper mounting plate and lower installation board；
It is provided with transverse groove on the upper mounting plate；Two angle modulation screws, two angle modulation are provided on the upper mounting plate
Screw is located at the both sides of stud；A wherein angle modulation screw is extended to by upper mounting plate insertion in lower installation board, and under
Mounting plate screw-thread fit；One end of another angle modulation screw is inserted by transverse groove in mounting plate, and with lower installation board screw thread
Cooperation；The plane mirror is mounted on the bottom surface of lower installation board.
Further, the optical fiber GRIN Lens fixing device include optical fiber GRIN Lens, the second angle modulation screw,
Rubber ring, fixed seat；Condenser lens mounting base is provided in the fixed seat, the rubber ring is located at fixed seat and condenser lens
Between mounting base, the optical fiber GRIN Lens is mounted on condenser lens mounting base upper end, and the condenser lens mounting base has
Flange；The second angle modulation screw is arranged on flange, and at least has three；It wears successively one end of the second angle modulation screw
Cross flange, rubber ring is inserted into fixed seat, and with fixed seat screw-thread fit.
Further, it is provided with installation base in the condenser lens mounting base, installation is set on the installation base
Set；It is provided with fastening screw in the installation set；The optical fiber GRIN Lens is mounted at the top of installation base.
The beneficial effects of the invention are as follows：Push-pull type optical fiber differential pressure pickup of the present invention, has the following advantages：
1) a kind of push-pull type optical fiber differential pressure pickup of the present invention, active and passive device, which is separated from each other design, makes it
It can work under the adverse circumstances such as strong electromagnetic, inflammable and explosive.
2) a kind of push-pull type optical fiber differential pressure pickup of the present invention, elastic metallic bellows used in sensor can
It is replaced according to actual demand, realizes that measurement range and sensitivity are adjustable.
3) a kind of push-pull type optical fiber differential pressure pickup of the present invention, it is of low cost, performance is stable, is easily changed and ties up
It repaiies.
Further, in use：
4) a kind of push-pull type optical fiber differential pressure pickup of the present invention, multiple sensors can be used in conjunction with a set of wide spectrum
Light source, photodetector realize the quasi- distribution measuring of multiple spot.
5) a kind of push-pull type optical fiber differential pressure pickup of the present invention, the space propagation meeting of wide spectrum optical on scanning shift platform
Temperature error is brought, but its space propagation distance does not exceed 15cm, so the error that temperature band is come can be ignored.
6) a kind of push-pull type optical fiber differential pressure pickup of the present invention can form telemtry net with fibre-optic transmission system (FOTS)
Network, realizes remote real time monitoring and measures.
Description of the drawings
Fig. 1 is the structural schematic diagram of push-pull type optical fiber differential pressure pickup in the embodiment of the present invention；
Fig. 2 is the stereogram for optical fiber self-focusing fixing device in the embodiment of the present invention；
Fig. 3 is the front view that Reflecting mirror fixing device is pushed away in the embodiment of the present invention；
Fig. 4 is the vertical view that Reflecting mirror fixing device is pushed away in the embodiment of the present invention；
Fig. 5 is the measuring system figure of push-pull type optical fiber differential pressure pickup in the embodiment of the present invention；
Fig. 6 is experimental data figure in the embodiment of the present invention；
It is indicated in figure：1- broad spectrum light sources；2- photodetectors；3- fiber couplers；The first optical patchcords of 4-；5- second
Optical patchcord；6- scanning shift platforms；8- push-pull type optical fiber differential pressure pickups；9- fiber adapter；10- optical fiber GRIN Lens is solid
Determine device；11- plane mirror fixing devices；12- support columns；3- equalizer bars；14- driving columns；15- encapsulating shells；16- elasticity gold
Belong to bellows；17- ring flanges；The logical pressure conduits of 18-.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figures 1 to 6, push-pull type optical fiber differential pressure pickup of the present invention, including fiber adapter 9, optical fiber
GRIN Lens fixing device 10, plane mirror fixing device 11, support column 12, equalizer bar 13, driving column 14, encapsulating shell
15, elastic metallic bellows 16, ring flange 17, logical pressure conduit 18；
The encapsulating shell 15 has inner cavity；The fiber adapter 9 is arranged at the top of encapsulating shell 15；The optical fiber autohemagglutination
The top in 15 inner cavity of encapsulating shell is arranged in focus lens fixing device 10；The fiber adapter 9 is fixed with optical fiber GRIN Lens
Device 10 is connected by optical fiber；The support column 12 is vertically provided at the interior intracavitary of encapsulating shell 15, and under the support column 12
Centre position of the end positioned at inner cavity lower surface；The upper end of the support column 12 is provided with equalizer bar 13, in the equalizer bar 13
Between position and support column 12 it is hinged；
The both sides of the support column 12 are both provided with elastic metallic bellows 16；16 top of the elastic metallic bellows is set
It is equipped with driving column 14, the upper end of the driving column 14 is connect with one end of equalizer bar 13；The upper end of the driving column 14 is provided with
Plane mirror fixing device 11；The plane mirror fixing device 11 is being located at optical fiber GRIN Lens fixing device 10 just
Lower section；
16 bottom of elastic metallic bellows is fixed on inner cavity lower surface by ring flange 17；The elastic metallic ripple
16 bottom of pipe is provided with logical pressure conduit 18.
The measurement method in order to better understand, on our needle scanning shift platforms the displacement distance X of GRIN Lens 71 with
The linear relationship of testing pressure difference, which is made, to be explained in detail and illustrates.
As shown in Figure 1, the 16 input pressure F1 of metal bellows in the left side to the sensor, right side metal bellows 16 are defeated
Enter pressure F2, since the sensor uses a kind of full symmetric structure, and identical material is used, so the influence of temperature
It can cancel out each other and ignore.Assuming that pressure F1 be more than pressure F2, then under the collective effect of pressure F1 and pressure F2 left side
Metal bellows 16 is axially stretched, and right side metal bellows 16 is compressed axially, deformation quantity it is identical and with pressure F1 and
The pressure difference a of pressure F2 is in a linear relationship, is set as ax.Since the variation of metal bellows makes the sensor light path difference equally send out
Raw axn1Variation, wherein n1For the ambient refractive index residing for differential pressure pick-up.
To keep the two-arm light path of the sensor equal again, position of the mobile GRIN Lens 71 on scanning shift platform,
Until observing white-light fringe primary maximum again in photodetector 2, displacement distance is X, change in optical path length Xn at this time2,
Wherein n2For the refractive index of displacement platform local environment.
Then white light interference theory obtains：
axn1=Xn2
When sensor is identical as scanning shift platform local environment, obtain：
ax=X
Therefore, we can obtain testing pressure difference a according to the displacement distance X of scanning shift platform.
In the specific application process：
Step 1: system building.The measuring system that each device forms push-pull type optical fiber differential pressure pickup is connected by Fig. 5；It should
Measuring system include broad spectrum light source 1, photodetector 2, fiber coupler 3, the first optical patchcord 4, the second optical patchcord 5,
Scanning shift platform 6, optical fiber GRIN Lens 7, optical fiber differential pressure pickup 8；Broad spectrum light source 1 and photodetector 2 respectively with light
The ends a of fine coupler 3 are connected with the ends b, and the ends c and the ends d are separately connected the first optical patchcord 4 and the first GRIN Lens 71, and first
The other end of optical patchcord 4 is connected with the fiber adapter 9 in optical fiber differential pressure pickup 8.First GRIN Lens 71 and second
GRIN Lens 72 is aligned and on scanning shift platform 6, and 72 position of the second GRIN Lens is fixed, the first GRIN Lens 71
Position is adjustable, and the second GRIN Lens 72 is connected to fiber adapter 9 by the second optical patchcord 5.
Specifically, the broad spectrum light source 1 is one kind in LED light source, SLD/SLED light sources, ASE light sources.
In the state of the equilibrium, plane is arrived at the ends c, the ends d of fiber coupler 3 to the push-pull type optical fiber differential pressure pickup 8 respectively
The equivalent optical path of 114 minute surface of speculum, and at this time the first GRIN Lens 71 at the center of 6 effective displacement distance of scanning shift platform
Position or so.
The length of the optical patchcord 4 and optical patchcord 5 may be as little to several centimetres, can also grow to several kilometers or more
It is long.
Above-mentioned push-pull type optical fiber differential pressure pickup is mainly the measurement that pressure difference is realized using optical fiber white light interference principle,
Under different pressures effect corresponding axial deformation occurs for two bellowss 6 of sensor internal, and then leads to Michelson white lights
Interferometer two-arm light path light path changes, and interference fringe is obtained again by the movement of scanning shift platform 6 in measuring system, this
When displacement platform displacement distance there are linear relationships with pressure difference, the number of testing pressure difference can be obtained by data analysis
It is worth size.
The internal diameter of the elastic metallic bellows used in the present embodiment is 50mm, height 100mm.4 length of optical patchcord is
3m, it is contemplated that the mobile effective distance of scanning shift platform 6 is 0.2m, therefore the Design of length of wire jumper 5 is 2.9m.Optical fiber differential pressure senses
Optical fiber GRIN Lens inside device 8 is separately fixed at the same position of two optical fiber self-focusing fixing devices 10, ensures two thoroughly
Mirror minute surface height is identical, and tail end connects fiber adapter 9 respectively.Silver-plated plane mirror is pasted onto speculum by silicon rubber and fixes
On device 11, and it is silver-plated face-up.
Step 2: beam path alignment.By adjusting Reflecting mirror fixing device 11 and optical fiber GRIN Lens fixing device 10
Angle modulation screw ensures that plane reflection minute surface is horizontal and identical, GRIN Lens the minute surface of height is horizontal and identical, the light of height
To mirror surface center, simultaneously former road is reflected back GRIN Lens to vertical exit.By adjusting the first self-focusing on scanning shift platform 6
The angle of lens 71 and the second GRIN Lens 72 ensures substantially completely to be incident on the from the emergent light of the first GRIN Lens 71
In two GRIN Lens 72.
Step 3: measuring initialization.Second GRIN Lens 72 of optical fiber is fixed on 6 one end of scanning shift platform, and adjustment is swept
The position of the first GRIN Lens 71 on displacement platform 6 is retouched until showing the center pole of white-light fringe in photodetector
Big value records the position of the first GRIN Lens 71 at this time and is demarcated as zero.
Step 4: sensor measurement is tested.It will be one in threeway rubber tube one end and optical fiber differential pressure pickup 8 in the present embodiment
A conduit 181 is connected, and the other both ends of threeway rubber tube connect the air gauge of pressurised airbag and market purchase respectively, and optical fiber differential pressure passes
Another conduit of sensor 182 is communicated with atmospheric pressure.It gradually pressurizes after opening scanning shift platform 6, record occurs in white-light fringe
The position of first GRIN Lens 71 and corresponding pressure when heart primary maximum.Threeway rubber tube is connected to conduit 182, conduit 181
Logical atmospheric pressure repeats to obtain Fig. 6 after testing again.
In conclusion push-pull type optical fiber differential pressure pickup of the present invention, has the following advantages：
1) a kind of push-pull type optical fiber differential pressure pickup of the present invention, active and passive device, which is separated from each other design, makes it
It can work under the adverse circumstances such as strong electromagnetic, inflammable and explosive.
2) a kind of push-pull type optical fiber differential pressure pickup of the present invention, elastic metallic bellows used in sensor can
It is replaced according to actual demand, realizes that measurement range and sensitivity are adjustable.
3) a kind of push-pull type optical fiber differential pressure pickup of the present invention, it is of low cost, performance is stable, is easily changed and ties up
It repaiies.
Further, in use：
4) a kind of push-pull type optical fiber differential pressure pickup of the present invention, multiple sensors can be used in conjunction with a set of wide spectrum
Light source, photodetector realize the quasi- distribution measuring of multiple spot.
5) a kind of push-pull type optical fiber differential pressure pickup of the present invention, the space propagation meeting of wide spectrum optical on scanning shift platform
Temperature error is brought, but its space propagation distance does not exceed 15cm, so the error that temperature band is come can be ignored.
6) a kind of push-pull type optical fiber differential pressure pickup of the present invention can form telemtry net with fibre-optic transmission system (FOTS)
Network, realizes remote real time monitoring and measures.
Specifically, the plane mirror fixing device 11 includes stud 111, angle modulation screw 112, rubber ring 113, plane
Speculum 114 and upper mounting plate 115 and lower installation board；
The stud 111 is arranged at the top of upper mounting plate；The rubber ring 113 is arranged in upper mounting plate and lower installation board
Between；
For the ease of the adjusting of 114 angle of plane mirror, while simplifying structure, further, the upper mounting plate 115
On be provided with transverse groove 116；Two angle modulation screws 112 are provided on the upper mounting plate 115, two angle modulation screws 112 are distinguished
Positioned at the both sides of stud 111；A wherein angle modulation screw 112 is extended to by the insertion of upper mounting plate 115 in lower installation board, and under
Mounting plate screw-thread fit；One end of another angle modulation screw 112 is inserted by transverse groove 116 in mounting plate, and with lower installation
Plate screw-thread fit；The plane mirror 114 is mounted on the bottom surface of lower installation board.
For the ease of the adjusting of 101 angle of optical fiber GRIN Lens, while simplifying structure, further, the optical fiber
GRIN Lens fixing device 10 includes optical fiber GRIN Lens 101, the second angle modulation screw 103, rubber ring 104, fixed seat
105；Condenser lens mounting base is provided in the fixed seat 105, the rubber ring 104 is located at fixed seat 105 and condenser lens
Between mounting base, the optical fiber GRIN Lens 101 is mounted on condenser lens mounting base upper end, and the condenser lens installs seat tool
There is flange；The second angle modulation screw 103 is arranged on flange, and at least has three；The one of the second angle modulation screw 103
End sequentially pass through flange, rubber ring 104 is inserted into fixed seat 105, and with 105 screw-thread fit of fixed seat.
For the ease of the installation and replacement of optical fiber GRIN Lens 101, further, set in the condenser lens mounting base
It is equipped with installation base, installation set is set on the installation base；Fastening screw 102 is provided in the installation set；The light
Fine GRIN Lens 101 is mounted at the top of installation base.
Claims (4)
1. push-pull type optical fiber differential pressure pickup, it is characterised in that：Dress is fixed including fiber adapter (9), optical fiber GRIN Lens
Set (10), plane mirror fixing device (11), support column (12), equalizer bar (13), driving column (14), encapsulating shell (15), bullet
Property metal bellows (16), ring flange (17), logical pressure conduit (18)；
The encapsulating shell (15) has inner cavity；Top of fiber adapter (9) setting in encapsulating shell (15)；The optical fiber is certainly
Condenser lens fixing device (10) is arranged at the top of encapsulating shell (15) inner cavity；The fiber adapter (9) and optical fiber self-focusing
Lens fixing device (10) is connected by optical fiber；The support column (12) is vertically provided at the interior intracavitary of encapsulating shell (15), and institute
The lower end for stating support column (12) is located at the centre position of inner cavity lower surface；The upper end of the support column (12) is provided with equalizer bar
(13), the centre position of the equalizer bar (13) and support column (12) are hinged；
The both sides of the support column (12) are both provided with elastic metallic bellows (16)；At the top of the elastic metallic bellows (16)
It is provided with driving column (14), the upper end of the driving column (14) is connect with one end of equalizer bar (13)；The driving column (14)
Upper end is provided with plane mirror fixing device (11)；The plane mirror fixing device (11) is located at optical fiber GRIN Lens
The underface of fixing device (10)；
Elastic metallic bellows (16) bottom is fixed on inner cavity lower surface by ring flange (17)；The elastic metallic ripple
Pipe (16) bottom is provided with logical pressure conduit (18).
2. push-pull type optical fiber differential pressure pickup as described in claim 1, it is characterised in that：The plane mirror fixing device
(11) include stud (111), angle modulation screw (112), rubber ring (113), plane mirror (114) and upper mounting plate (115)
And lower installation board；
The stud (111) is arranged at the top of upper mounting plate；The rubber ring (113) is arranged in upper mounting plate and lower installation board
Between；
It is provided with transverse groove (116) on the upper mounting plate (115)；It is provided with two angle modulation spiral shells on the upper mounting plate (115)
Silk (112), two angle modulation screws (112) are located at the both sides of stud (111)；Wherein an angle modulation screw (112) is by upper peace
Loading board (115) insertion extend in lower installation board, and with lower installation board screw-thread fit；One end of another angle modulation screw (112)
Be inserted into mounting plate by transverse groove (116), and with lower installation board screw-thread fit；The plane mirror (114) is mounted on
The bottom surface of lower installation board.
3. push-pull type optical fiber differential pressure pickup as described in claim 1, it is characterised in that：The optical fiber GRIN Lens is solid
It includes optical fiber GRIN Lens (101), the second angle modulation screw (103), rubber ring (104), fixed seat (105) to determine device (10)；
Condenser lens mounting base is provided on the fixed seat (105), the rubber ring (104) is located at fixed seat (105) and focuses thoroughly
Between mirror mounting base, the optical fiber GRIN Lens (101) is mounted on condenser lens mounting base upper end, the condenser lens installation
Seat tool has flange；The second angle modulation screw (103) is arranged on flange, and at least has three；The second angle modulation screw
(103) one end sequentially passes through flange, rubber ring (104) is inserted into fixed seat (105), and matches with fixed seat (105) screw thread
It closes.
4. push-pull type optical fiber differential pressure pickup as claimed in claim 3, it is characterised in that：It is set in the condenser lens mounting base
It is equipped with installation base, installation set is set on the installation base；Fastening screw (102) is provided in the installation set；It is described
Optical fiber GRIN Lens (101) is mounted at the top of installation base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865473.6A CN108663158B (en) | 2018-08-01 | 2018-08-01 | Push-pull type optical fiber differential pressure sensor |
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| CN109443629A (en) * | 2018-10-29 | 2019-03-08 | 西安天舁敏道光电科技有限公司 | A kind of differential pressure fibre-optical probe structure and its differential pressure fibre optical sensor |
| CN109770854A (en) * | 2019-02-02 | 2019-05-21 | 东北大学秦皇岛分校 | Human body physical sign information monitoring system based on Fibre Optical Sensor |
| CN111337430A (en) * | 2020-03-13 | 2020-06-26 | 华太极光光电技术有限公司 | Transmission type terahertz probe adjusting device and positioning method |
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