CN103900756A - Fiber bragg grating pressure sensor capable of achieving positive and negative pressure monitoring and testing method - Google Patents
Fiber bragg grating pressure sensor capable of achieving positive and negative pressure monitoring and testing method Download PDFInfo
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- CN103900756A CN103900756A CN201410153179.4A CN201410153179A CN103900756A CN 103900756 A CN103900756 A CN 103900756A CN 201410153179 A CN201410153179 A CN 201410153179A CN 103900756 A CN103900756 A CN 103900756A
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Abstract
The invention discloses a fiber bragg grating pressure sensor capable of achieving positive and negative pressure monitoring and a testing method. The fiber bragg grating pressure sensor comprises a connector, a filter screen, a base, an outer shell, a corrugate pipe, a first fiber bragg grating, a second fiber bragg grating, an optical fiber, an optical cable connector, an armored optical cable, a brace, a flange plate, an outer shell cover and a strain beam, wherein the outer shell cover is used for protecting the optical fiber from a sealing glue sealing part to an optical cable connector part, and the strain beam is used for applying prestress. The fiber bragg grating pressure sensor capable of achieving the positive and negative pressure monitoring and the testing method are suitable for the monitoring of pressure safety of oil and gas pipelines, urban underground gas pipelines, heating power pipelines, water supplying pipelines, oil tank pipelines, oil conveying pipelines and other pipe networks, the potential safety hazards that an electronic sensor is electrified and is unsafe in nature are eliminated, and meanwhile the capacity of phases is also improved greatly; the fiber bragg grating pressure sensor is applied to the aspect of real-time online monitoring of coal and rock mass gas pressure, errors caused by single data monitoring are avoided, the sensitivity and the accuracy of the system are improved, manpower, material resources and time are saved, and meanwhile the danger probably brought by personnel on site can be avoided.
Description
Technical field
The present invention relates to a kind of sensor, relate in particular to a kind of high precision and can realize fiber bragg grating pressure sensor and the method for testing of the bellows structure of malleation, negative pressure monitoring, be specially adapted to the monitoring of coal mine safety monitoring gas pressure and chemical pipeline pressure monitoring.
Background technology
Along with the fast development of the industries such as China's oil, chemical industry, coal, metallurgy, be accompanied by commercial production and the various combustible and poisonous gas operations place that produces also in continuous increase.Especially all may there is leakage flammable, toxic gas in the link such as enterprise production process and accumulating such as oil, chemical industry, metallurgy, leak and have an accident for fear of inflammable and explosive gas (liquid) body, adopt electronic sensor monitoring early-warning system, with the maximum deficiency of the inflammable and explosive combustion gas of electronics Sensor monitoring (liquid) body be that sensor is short serviceable life, particularly electronic sensor does not belong to essential safe type, in monitoring hidden danger, is provided with again a hidden danger.
Aspect, colliery, also exists means single aspect gas pressure monitoring, need special personnel to patrol and examine to scene, and waste of manpower resource, has increased again danger when personnel patrol and examine simultaneously.Therefore, reliable, safe sensor aspect the ductwork pressure safety monitorings such as oil-gas pipeline, Urban Underground coal gas, heating power, water supply, oil tank, pipe laying and coal-mine gas pressure monitoring aspect more aobvious important.
In existing pressure transducer, the pressure transducer of Fabry Paro cavity configuration form, carries out pressure detection using F-P chamber as sensitive element.Wherein, capillary type structure exists glass welding difficulty large, drift value is large, poor repeatability, serviceable life poor shortcoming; Reed type exists that encapsulation difficulty is large, the homogeneity of poor repeatability, diaphragm is wayward, produces difficult shortcoming in batches; MEMS chip type exists coupling fiber difficulty large, encapsulates difficult shortcoming.
The pressure transducer of optical fiber grating structure form, using fiber grating as sensitive element, carries out pressure detection.Wherein, bowden tubular type exists and differentiates rate variance, the shortcoming that Bourdon tube requirement on machining accuracy is high, optical fiber Bragg grating encapsulation difficulty is large, drift value is large; Cylinder thin-wall construction exists to be differentiated rate variance, small-range sensor and has that size is too large, sensitivity is low, be difficult to realize the shortcomings such as negative pressure monitoring.
Summary of the invention
The object of the invention is in order to address the above problem, fiber bragg grating pressure sensor and method of testing that a kind of high precision can realize malleation, detection of negative pressure have been proposed, this fiber bragg grating pressure sensor, because itself is not charged, essential safety, can realize real time on-line monitoring, can be used for the inflammable and explosive pressure monitoring that waits the dangerous occasion of tool simultaneously.
To achieve these goals, the present invention adopts following technical scheme:
A fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring, comprising: joint, screen pack, base, shell, corrugated tube, fiber grating one, fiber grating two, optical fiber, fiber cable joint, armored optical cable, pillar, ring flange, for the protection of sealant sealing position to the casing cover of fiber cable joint position optical fiber and for bonding fiber grating and apply prestressed strain beam.
Described joint is connected with body seal; Screen pack, base, shell, corrugated tube, strain beam, fiber grating one, fiber grating two, optical fiber, pillar and ring flange are arranged on enclosure; Corrugated tube and ring flange pass through welded seal, and are fixed together, and ring flange is fixed on base, between base and ring flange, is tightly connected; Described base is connected with body seal, and screen pack is arranged between base openings end and joint inside, and fixes by joint.
Described fiber grating one is fixed on strain beam both sides with fiber grating two; Strain beam is fixed on pillar upper end; In the inserted base perforate of pillar lower end, between strain beam and pillar, fix by adjusting screw.
Optical fiber one end is fiber grating and is fixed on strain beam, and the other end enters armored optical cable through shell, fiber cable joint successively; The position that optical fiber is connected with shell sealant sealing fixing seal, casing cover is connected with body seal, and casing cover connects armored optical cable by fiber cable joint.
Described joint comprises three kinds of cutting ferrule interface type joints, normal formula joint, built-in type joint, replaceable as required.
The installation pipe fitting of described cutting ferrule interface type joint comprises: conical head, larynx hoop, Air Filter, antipriming pipe, connector, ferrule fitting, connecting pipe, cutting sleeve type three-way joint, stop valve, hydralic pressure gauge threeway and hydralic pressure gauge.
Conical head tail end inserts antipriming pipe, between antipriming pipe and Air Filter, fix by larynx hoop, antipriming pipe and connector weld together, connector is connected with connecting pipe by ferrule fitting, cutting sleeve type three-way joint one end is taken in succession, the other end connects stop valve, the 3rd end is connected to water delivering orifice through another stop valve, hydralic pressure gauge threeway one end is connected with stop valve, the other end is connected to sensor main body part, and hydralic pressure gauge and hydralic pressure gauge threeway are tightly connected.
Described connecting pipe is arranged to multistage, in order to air guide and draining.
Described corrugated tube material is 1C
r18N
i9T
i, beryllium-bronze, tin bronze or other material.
A kind of method of testing of the fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring, strain beam and pillar are in the time of assembling, in the inserted base perforate of pillar lower end, strain beam is fixed on pillar upper end by adjusting screw, strain beam head contacts with corrugated tube top, and strain beam and corrugated tube are applied to prestress, allows the further inserted base of pillar, make, between strain beam and corrugated tube contact portion and pillar, strain of flexure occurs, then will adjust screw tightening; By regulating the prestressed large I between strain beam and corrugated tube to change strain of flexure size, and then can regulate sensor negative pressure to measure range.
After sensor package, demarcate through high precision negative pressure transmitter and piston gage, obtain the linear relationship between wavelength and pressure, change by the direct monitoring pressure of demodulation wavelength variations.
After sensor package, through the concrete grammar of high precision negative pressure transmitter and piston gage demarcation be:
Wherein, λ
bfor FBG centre wavelength, Δ λ
b1with Δ λ
b2the variable quantity that is respectively fiber grating one and fiber grating two centre wavelengths, P is pressure; Calculate by above formula
can obtain the linear relationship between wavelength and pressure.
By adjusting corrugated tube thickness, the corrugated tube number of plies, corrugated tube Effective wave number or corrugated tube size, can change sensitivity and the malleation range of sensor.
By adjusting strain beam width, the initial prestressed size of thickness capable of regulating, in the time of assembling, pass through to adjust prestressed size, capable of regulating sensor negative pressure range.
Working sensor principle:
Pressure be on the occasion of time (malleation):
When gas or liquid are by joint inner passage, after filtering by screen pack, arrive bellows interior through base passages, pressure variation can make corrugated tube in axial direction generation deformation, corrugated tube deformation meeting promotes to be close to the strain beam generation flexural deformations on corrugated tube top, and when strain beam generation flexural deformations, deformation also can occur the FBG that is bonded in the upper and lower both sides of strain beam, thereby cause FBG centre wavelength generation deformation, due to demarcation before
known, can draw the force value (pressure values) of moment sensor inside.
When pressure is negative value (negative pressure):
When original pressure is zero, sensor internal original pressure is zero, in the time that sensor measurement device interior pressure is negative pressure, sensor internal confined space pressure reduces, due to when the sensor package, make its distortion in advance strain beam and prestress of corrugated tube, therefore script is at the corrugated tube of initial position (the deformation position after applying prestress), can because of internal pressure reduce height can decline thereupon, thereby cause FBG wavelength to change, and then can draw the force value (pressure values) of moment sensor inside.
The invention has the beneficial effects as follows:
1. the present invention is applicable to the ductwork pressure safety monitoring aspects such as oil-gas pipeline, Urban Underground coal gas, heating power, water supply, oil tank, pipe laying, eliminate electronic sensor itself charged, the unsafe hidden danger of essence, simultaneously relative electronic sensor has also had large lifting on capacity.
2. the present invention is applied to coal and rock gas pressure real time on-line monitoring aspect, avoid only monitoring the error that single data are brought, sensitivity and the accuracy of system are improved, the realization of remote online monitoring function, at saving human and material resources with in the time, avoid again personnel to monitor the Personal Risk that may bring to scene.
3. the present invention can be by selecting transducer sensitivity and range according to actual operation requirements.Change corrugated tube material, corrugated tube material thickness, corrugated tube diameter, the number of plies of corrugated tube, corrugated tube Effective wave number, can realize the adjustment to transducer sensitivity and malleation range, during by adjustment assembly to corrugated tube and the prestressed size of strain beam, the adjustment of capable of regulating sensor negative pressure range.
4. sensor measurement capacity of the present invention is large, requires the supporting jointing of capable of choosing multiple, to adapt to engineering demand according to actual installation; Sensor construction is relatively simple, and parts machining is convenient, cost-saving.
5. sensor, take light wave as information carrier, is not subject to electromagnetic interference (EMI), can data acquisition under strong-electromagnetic field environment; Signal is by optical cable transmission, and signal attenuation is little, long transmission distance.
6. sensor itself adopts fire prevention, resistant material, and intensity and toughness is high, not fragile.
Accompanying drawing explanation
Fig. 1 is the fiber bragg grating pressure sensor structural representation with cutting ferrule interface type joint;
Fig. 2 is the fiber bragg grating pressure sensor structural representation with modular connection;
Fig. 3 is the fiber bragg grating pressure sensor structural representation with built-in type joint;
Fig. 4 is sensor main body front section view;
Fig. 5 is the supporting syndeton integral installation of cutting ferrule interface type joint figure;
Fig. 6 is cutting ferrule interface type joint design schematic diagram;
Fig. 7 is modular connection structural representation;
Fig. 8 is built-in type joint design schematic diagram;
Fig. 9 (a) is that strain of flexure schematic diagram does not occur for sensing corrugated tube and strain beam assembling;
Fig. 9 (b) is that strain of flexure schematic diagram occurs for sensing corrugated tube and strain beam assembling;
Figure 10 is the poor linear relationship chart with force value of sensor wavelength.
Wherein, 1 '. cutting ferrule interface type joint, 1 ' '. modular connection, 1 ' ' '. built-in type joint, 2. screen pack, 3. base, 4. shell, 5. corrugated tube, 6. strain beam, 7. fiber grating one, 8. fiber grating two, 9. optical fiber, 10. casing cover, 11. fiber cable joints, 12. armored optical cables, 13. fluid sealants, 14. O-ring seals, 15. adjust screw, 16. pillars, 17. ring flanges, 18. fixed screws, 19. conical heads, 20. larynx hoops, 21. Air Filters, 22. antipriming pipes, 23. connectors, 24. ferrule fittings, 25. connecting pipes, 26. cutting sleeve type three-way joints, 27. stop valves, 28. hydralic pressure gauge threeways, 29. hydralic pressure gauges.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
As Figure 1-Figure 4, a kind of bellows structure fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring, sensor main body part comprises:
Cutting ferrule interface type joint 1 ', connects after its supporting syndeton, for detection of coal-bed gas pressure.
Normal formula joint 1 ' ', can be directly connected on the pressure pipeline that will measure.
Built-in type joint 1 ' ' ', can directly be positioned in the pressure-tight space that will measure.
Fiber grating 1 and fiber grating two 8(are designated hereinafter simply as FBG1, FBG2), centre wavelength difference, for laying respectively at the upper and lower both sides of strain beam.
Fiber cable joint 11, is used for being connected and fixed optical cable and sensor.
Armored optical cable 12, is used for connecting sensor and (FBG) demodulator.
14 4 of O-ring seals, are the o type circle of different model, and material is butyronitrile, for the sealing between each parts.
Adjusting screw 15, be used for fixing pillar, is standard component.
19 4 of fixed screws, for being connected and fixed of ring flange and base, are standard component.
Between corrugated tube 5 and ring flange 17 by being welded to connect and sealing.
Joint for being threaded, has O-ring seal to seal with shell 4 between the two; Screen pack 2, base 3, shell 4, corrugated tube 5, strain beam 6, fiber grating 1, fiber grating 28, optical fiber 9, fluid sealant 13, O-ring seal 14, adjustment screw 15, pillar 16, ring flange 17, fixed screw 18 are arranged on enclosure; Between corrugated tube 5 and ring flange 17, be welded to connect, the ring flange 17 after welding is fixed on base 3 by fixed screw 18, between base 3 and ring flange 17, has O-ring seal 14 to seal; Fiber grating 1 is fixed on strain beam 6 both sides with fiber grating 28; Strain beam 6 be fixed by screws in pillar 16 upper ends simultaneously strain beam 6 heads contact and passes through the degree of depth of adjustment pillar 16 inserted base 3 perforates with corrugated tube 5 tops, apply certain prestress compression corrugated tube 5; In pillar 16 lower end inserted base 3 perforates, by adjusting, screw 15 will apply prestressed strain beam 6 and pillar 16 is fixed; Base 3 is threaded connection and is fixed on shell 4, between base 3 and shell 4, has O-ring seal 14 to seal; Screen pack 2 is placed between base 3 openends and joint inside, and fixes by joint; Optical fiber 9 one end are fiber grating and are fixed on strain beam 6, and the other end enters armored optical cable 12 through shell 4, fiber cable joint 11 successively; The position fluid sealant 13 that optical fiber 9 is connected with shell 4 seals fixing seal, and casing cover 10 seals the optical fiber 9 of position to fiber cable joint 11 positions for the protection of fluid sealant 13; Casing cover 10 is threaded with shell 4, between have O-ring seal 14 to seal, casing cover 10 connects armored optical cable 12 by fiber cable joint 11.
Before being adhesively fixed between strain beam 6 and FBG, need strain beam 6 to carry out Ultrasonic Cleaning, to guarantee that gluing of surfaces is clean, thereby guarantee between strain beam 6 and FBG in conjunction with closely reliable.
When strain beam 6 assembles with corrugated tube 5 tops, need to apply prestress to strain beam 6, adjust distortion between strain beam 6 and corrugated tube 5 contact portions and pillar 16 by adjusting the degree of depth of perforate on pillar 16 inserted bases 3, make strain beam 6 and corrugated tube 5 contact portion generation strain of flexure.As shown in Fig. 9 (a) and Fig. 9 (b).
When strain beam 6 assembles with corrugated tube 5 tops, can be by regulating the prestress between strain beam 6 and corrugated tube 5 regulate negative pressure range.
As shown in Figure 5, the supporting erection joint pipe section of cutting ferrule interface type joint 1 ' is divided and is comprised: conical head 19, larynx hoop 20, Air Filter 21, antipriming pipe 22, connector 23, ferrule fitting 24, connecting pipe 25, cutting sleeve type three-way joint 26, stop valve 27, hydralic pressure gauge threeway 28, hydralic pressure gauge 29.
Wherein, conical head 19 plays guide effect in the time of mounting connection structure, and material is bakelite; Larynx hoop 20, is used for Air Filter to be tightly fixed on antipriming pipe, and material is 304 stainless steels; Air Filter 21, is 150 object steel meshes, is wrapped on antipriming pipe, plays dustproof effect, and material is 304 stainless steels; Antipriming pipe 22, is the stationary platform of Air Filter, plays the effect of supporting Air Filter simultaneously, and material is 304 stainless steels; Connector 23, is used for connecting antipriming pipe 22 and connecting pipe 25, and material is 304 stainless steels; Connecting pipe 25, is used for air guide or draining, and material is 304 gapless stainless steel tubes, and withstand voltage is more than 10MPa; More than 24 of ferrule fittings, are used for connecting and sealing each connector, and material is 304 stainless steels, and withstand voltage is more than 10MPa; Cutting sleeve type three-way joint 26, is used for connecting and shunting action, and material is 304 stainless steels, and withstand voltage is more than 10MPa; 27 two of stop valves, are used for controlling gas and liquid break-make, and material of main part is 304 stainless steels, and sealing load is more than 10MPa; Hydralic pressure gauge threeway 28, is used for connecting hydralic pressure gauge and wireway, and material is 304 stainless steels, and withstand voltage is more than 10MPa; Hydralic pressure gauge 29, is used for display pipes internal pressure, fiber Bragg grating type sensor is supplemented, for on-the-spot personnel in the pit provides information.
Between conical head 19 and antipriming pipe 22, be connected by screw; Fixing by three larynx hoops 20 between antipriming pipe 22 and Air Filter 21; Between antipriming pipe 22 and connector 23 by being welded to connect; Between hydralic pressure gauge 29 and hydralic pressure gauge threeway 28, be threaded connection, have O-ring seal to seal between the two;
For convenience of view, between A-B, Air Filter does not give picture; C end is freeing port; D end is sensor main body part.
Normal formula joint 1 ' ' can be connected with the modular connection such as equipment pipe, carry out pressure (malleation negative pressure) and detect.
Built-in type joint 1 ' ' ', after being connected with sensor main body, can entirety putting into and will measure confined space, carry out pressure (malleation negative pressure) and detect.
The structural representation of three kinds of joints as Figure 6-Figure 8,
Between cutting ferrule interface type joint 1 ' and supporting connection device, sealing means adopts metal conical surface seal, and its sealing principle is identical with ferrule fitting sealing principle, in high pressure and ultra-high vacuum environment, can obtain good sealing effectiveness.
Normal formula joint 1 ' ', screw thread can select the sealed tube screw thread of M20X1.5 or the each size of standard to make it supporting with most equipment jointing, convenient and fast connection, be connected seal form with relevant device and generally select o type circle sealing means or pipe thread seal mode.
Built-in type joint 1 ' ' ', be only connected with sensor main body, can entirety when sensor uses put into and will measure confined space, for example, in liquid or gas, carry out pressure monitoring, or put into liquid and carry out level monitoring.
Specific formula for calculation is as follows:
According to prior art and data known temperature and the wavelength variations Δ λ of strain to the common generation of strain beam
b=0.74 λ
bε
b, wherein λ
bfor FBG centre wavelength, ε
bfor strain.That is:
After deformation produces, the strain of two gratings is respectively:
ε
B1＝ε
T+ε
M （2）
ε
B2＝ε
T-ε
M （3）
Wherein ε
tfor temperature affects the strain causing, ε
mthe strain causing for deflection.
Obtained by formula (2) and formula (3):
Known by formula (1)
Optic fiber grating wavelength changes
with strain of flexure ε
mlinear and one-to-one relationship.
Meanwhile, the strain facies that temperature produces the grating under environment of the same race is same, is all ε
t, through type (1) formula (2) and formula (3) combination, we have eliminated ε
tthereby, eliminated temperature to required measurement result ε
mimpact.
Strain of flexure ε
mcan be reduced to liquid or gas sensor internal corrugated tube axial deformation amount is multiplied by a coefficient
ε
M＝k·X （6）
In formula, k is coefficient, and X is corrugated tube axial deformation amount
According to Hooke's law
F＝K·X （7）
K is stiffness (stubborn) coefficient of object, and X is elastic deformation value.Stiffness (stubborn) coefficient of object is relevant with material, thickness, the number of plies, diameter and the Effective wave number etc. of corrugated tube, and in the time determining corrugated tube model, its stiffness factor K also determines thereupon.
According to pressure pressure reduction formula
F＝P·S （8）
Wherein P is pressure, and S is lifting surface area
Drawn by formula (5), formula (6), formula (7), formula (8):
After sensor package, demarcate (P demarcates by pressure, and FBG wavelength and wavelength variations are by (FBG) demodulator demodulation), P, λ through high precision negative pressure transmitter and piston gage
b, Δ λ
b1, Δ λ
b2all known, therefore can obtain
and
for definite constant, therefore obtaining
after, we can change by the direct monitoring pressure of demodulation wavelength variations (pressure), meanwhile, further clear and definite sensitivity and the range that can change (comprising material, thickness, the number of plies, diameter and Effective wave number etc.) sensor by the model of change corrugated tube.The poor linear relationship chart with force value of sensor wavelength as shown in figure 10.
Sensor card socket formula joint 1 ' supporting syndeton is installed and used explanation:
When use, adopt standard " Direct Determination of the coal mine underground coal bed gas pressure of AQ/T1047-2007 ", adopt initiatively pressure testing method.
First punch, then the conical head assembling in advance 19, antipriming pipe 22, Air Filter 21, larynx hoop 20 etc. are sent in hole, then extend to correct position with connecting pipe 25 and ferrule fitting 24 successively, then by connector 23 with down to punching aperture seal with upper part, for building the space of a sealing between connector 23 upper ends and coal seam.Finally bite type threeway 26, stop valve 27, hydralic pressure gauge threeway 28, hydralic pressure gauge 29, sensor are carried out to corresponding connection.In the time that seal cavity has ponding, can discharge water to the water in seal cavity by the stop valve of dewatering outlet end 27, discharge hydraulic pressure, make to measure methane gas pressure more accurate.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. can realize the fiber bragg grating pressure sensor of positive/negative-pressure monitoring for one kind, it is characterized in that, comprising: joint, screen pack, base, shell, corrugated tube, fiber grating one, fiber grating two, optical fiber, fiber cable joint, armored optical cable, pillar, ring flange, for the protection of sealant sealing position to the casing cover of fiber cable joint position optical fiber and for bonding fiber grating and apply prestressed strain beam;
Described joint is connected with body seal; Screen pack, base, shell, corrugated tube, strain beam, fiber grating one, fiber grating two, optical fiber, pillar and ring flange are arranged on enclosure; Corrugated tube and ring flange pass through welded seal, and are fixed together, and ring flange is fixed on base, between base and ring flange, is tightly connected; Described base is connected with body seal, and screen pack is arranged between base openings end and joint inside, and fixes by joint;
Described fiber grating one is fixed on strain beam both sides with fiber grating two; Strain beam is fixed on pillar upper end; In the inserted base perforate of pillar lower end, between strain beam and pillar, fix by adjusting screw;
Optical fiber one end is fiber grating and is fixed on strain beam, and the other end enters armored optical cable through shell, fiber cable joint successively; The position that optical fiber is connected with shell sealant sealing fixing seal, casing cover is connected with body seal, and casing cover connects armored optical cable by fiber cable joint.
2. a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 1, is characterized in that, described joint comprises three kinds of cutting ferrule interface type joints, normal formula joint, built-in type joint, replaceable as required.
3. a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 1, it is characterized in that, the installation pipe fitting of described ferrule fitting comprises: conical head, larynx hoop, Air Filter, antipriming pipe, connector, ferrule fitting, connecting pipe, cutting sleeve type three-way joint, stop valve, hydralic pressure gauge threeway and hydralic pressure gauge;
Conical head tail end inserts antipriming pipe, between antipriming pipe and Air Filter, fix by larynx hoop, antipriming pipe and connector weld together, connector is connected with connecting pipe by ferrule fitting, cutting sleeve type three-way joint one end is taken in succession, the other end connects stop valve, the 3rd end is connected to water delivering orifice through another stop valve, hydralic pressure gauge threeway one end is connected with stop valve, the other end is connected to sensor main body part, and hydralic pressure gauge and hydralic pressure gauge threeway are tightly connected.
4. a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 1, is characterized in that, described connecting pipe is arranged to multistage, in order to air guide and draining.
5. a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 1, is characterized in that, described corrugated tube material is 1C
r18N
i9T
i, beryllium-bronze, tin bronze or other material.
6. the method for testing of a fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 1, it is characterized in that, strain beam and pillar are in the time of assembling, in the inserted base perforate of pillar lower end, strain beam is fixed on pillar upper end by adjusting screw, strain beam head contacts with corrugated tube top, strain beam and corrugated tube are applied to prestress, allow the further inserted base of pillar, make to deform between strain beam and corrugated tube contact portion and pillar, produce strain of flexure, then will adjust screw tightening; By regulating the prestressed size between strain beam and corrugated tube, can regulate sensor negative pressure to measure range;
After sensor package, demarcate through high precision negative pressure transmitter and piston gage, obtain the linear relationship between wavelength and pressure, change by the direct monitoring pressure of demodulation wavelength variations.
7. the method for testing of a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 6, is characterized in that, after sensor package, through the concrete grammar of high precision negative pressure transmitter and piston gage demarcation is:
Wherein, λ
bfor FBG centre wavelength, Δ λ
b1with Δ λ
b2the variable quantity that is respectively fiber grating one and fiber grating two centre wavelengths, P is pressure; Calculate by above formula
can obtain the linear relationship between wavelength and pressure.
8. the method for testing of a kind of fiber bragg grating pressure sensor of realizing positive/negative-pressure monitoring as claimed in claim 6, it is characterized in that, by adjusting corrugated tube thickness, the corrugated tube number of plies, corrugated tube Effective wave number or corrugated tube size, can change sensitivity and the malleation range of sensor; During by adjustment assembly, to corrugated tube and the prestressed size of strain beam, can change the negative pressure range of sensor.
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| CN110285915A (en) * | 2019-07-11 | 2019-09-27 | 武汉奥特多电子科技有限公司 | A kind of B/P EGR Back Pressure Transducer EGR that vacuum pump detection stability is good |
| CN114878038A (en) * | 2022-05-17 | 2022-08-09 | 武汉雷施尔光电信息工程有限公司 | Double-fiber grating diaphragm type pressure sensor and low-pressure calibration system and method thereof |
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| CN114878038A (en) * | 2022-05-17 | 2022-08-09 | 武汉雷施尔光电信息工程有限公司 | Double-fiber grating diaphragm type pressure sensor and low-pressure calibration system and method thereof |
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