CN108709895A - A kind of optical fiber acoustic detection probe for leakage monitoring system - Google Patents
A kind of optical fiber acoustic detection probe for leakage monitoring system Download PDFInfo
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- CN108709895A CN108709895A CN201810931546.7A CN201810931546A CN108709895A CN 108709895 A CN108709895 A CN 108709895A CN 201810931546 A CN201810931546 A CN 201810931546A CN 108709895 A CN108709895 A CN 108709895A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 123
- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 239000000523 sample Substances 0.000 title claims abstract description 44
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 229920001971 elastomer Polymers 0.000 claims abstract description 83
- 239000000806 elastomer Substances 0.000 claims abstract description 83
- 238000009434 installation Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims abstract description 5
- 238000004080 punching Methods 0.000 claims description 5
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 239000003921 oil Substances 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 210000004177 elastic tissue Anatomy 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 241000218300 Liriodendron Species 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003305 oil spill Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 210000004722 stifle Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
- G01N2021/9542—Inspecting the inner surface of hollow bodies, e.g. bores using a probe
- G01N2021/9546—Inspecting the inner surface of hollow bodies, e.g. bores using a probe with remote light transmitting, e.g. optical fibres
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to technical field of optical fiber sensing, and in particular to a kind of optical fiber acoustic detection probe for leakage monitoring system.The probe includes structure installation and optic fibre light path two parts, and structure installation section includes upper end cover, screw rod, No.1 II types gasket, No.1 elastomer, No.1 I types gasket, No. two elastomers, No. two I types gaskets, No. three elastomers, No. two II types gaskets, bottom end cover, inner sleeve, outer sleeve, sealing bucket, sealing bung, installation sleeve, mounting bracket；Optic fibre light path part includes 3 × 3 couplers, input optical fibre, reference arm optical fiber, detection arm optical fiber, emptying end optical fiber, No.1 FRM speculums, No. two FRM speculums, No.1 photodetector, No. two photodetectors, fiber laser light sources；The present invention does not use electric power, is integrally passive；Used optical device is polarization-maintaining device, to prevent the interference of effect of polarization reflected light；Elastomer high sensitivity；Optical fiber sensing technology is applied to station leakage monitoring for the first time.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, and in particular to a kind of optical fiber sonic detection for leakage monitoring system
Probe.
Background technology
Oil pipeline is the important system that oil company is used to convey crude oil, and pipeline oil transportation is also the main side of carried of crude oil
One of formula.
Thus crude oil pipeline is the lifeline of carried of crude oil, once occur oil spill disaster, caused by not only
Only it is the loss of economy and property.If leakage is happened at the intensive place of flow of the people, it will the life security of the people is threatened,
Cause serious environmental pollution simultaneously.After leakage accident generation need that the pipeline leaked is checked and repaired, from
And it is also a huge loss to stop production with paying for human and material resources.
If monitored in real time to petroleum pipeline using leakage monitoring system, once detect the generation of leakage event,
It is alarmed at the first time to related personnel by leakage monitoring system, and accurately judges the position that leakage occurs, this
Sample goes inspection to handle once can allow before relevant personnel's first time, excludes hidden danger before accident generation, oil is revealed
Accident stifles in the cradle.
Acoustic detection probe militarily has many applications, the sonic probe of many types to developed by people, wherein
Bobbin-type probe include single armed wound form, push-pull type, column type containing air chamber and rigidity wall type four kinds of structures.Push-pull biography
Arm Optical Fiber Winding is felt on the elastomer of outer layer, and reference arm optical fiber is wrapped on the elastomer of internal layer, but elastomer is made by sound wave
Used time, outer layer optical fiber shorten, and inner layer optical fiber is elongated, and compared to bobbin-type single armed wound form structure, the structure is complex, but
It is sensitivity higher.
Column type containing air chamber is designed using the double-deck chamber, and inner cavity winds reference arm optical fiber, and store extra optical fiber and
Coupler, exocoel wind pickup arm optical fiber, and Optical Fiber Winding is on acoustic elasticity body.Its structure is more complicated, and technological requirement is relatively high.
Rigid arm type structure is also cylindrical structure, but using rigid body, and reference optical fiber is wrapped on rigid body, just
It is elastomeric material except property body, sensor fibre is wrapped on this layer of elastomer.It is this relatively simple for structure, it is also easy to realize,
But sensitivity and stability be not high.
Invention content
The present invention provides a kind of optical fiber acoustic detection probe for leakage monitoring system, and inside uses optical fiber as sensitive
Element, using bobbin-type single armed wound form structure, bobbin-type probe mainly uses Michelson's interferometer or Liriodendron chinese
Instrument structure, wherein single armed wound form are pickup arm Optical Fiber Winding on elastomer, and reference arm is placed in rear end, and elastomer is in sound field
In deformed upon with acoustic pressure, cause the stress of pickup arm optical fiber and length to change.
The technical solution adopted by the present invention is：A kind of optical fiber acoustic detection probe for leakage monitoring system, the spy
Head includes structure installation and optic fibre light path two parts, and the structure installation section includes upper end cover 1, screw rod 2, No.1 II type gaskets
3a, No.1 elastomer 4a, No.1 I type gaskets 5a, No. two elastomer 4b, No. two I type gaskets 5b, No. three elastomer 4c, No. two II
Type gasket 3b, bottom end cover 6, inner sleeve 7, outer sleeve 8, sealing bucket 9, sealing bung 10, installation sleeve 11, mounting bracket 12；Institute
It includes 3 × 3 couplers 13, input optical fibre 14, reference arm optical fiber 15, detection arm optical fiber 16, emptying end light to state optic fibre light path part
20, No. two fibre 17,18, No. two FRM speculums 19 of No.1 FRM speculums, No.1 photodetector photodetectors 21, optical fiber swash
Radiant 22；
Wherein upper end cover 1 and bottom end cover 6 are for fixing and closing inner sleeve 7 and outer sleeve 8, and screw rod 2 is for fixed entire
Detection probe, is the skeleton of detection probe, and No.1 II type gasket 3a and No. two II type gaskets 3b are located at three elastomers two
Outermost is held, plays the role of fixed elastomer, No.1 elastomer 4a, No. two elastomer 4b and No. three elastomer 4c belong to sound wave
Elastomer, wound thereon have detection arm optical fiber, elastic deformation occur under sound wave effect, drive detection arm fibre strain and drawing
It stretches, No.1 I type gasket 5a and No. two I type gaskets 5b are located at No. two both ends elastomer 4b, play the role of connecting elastomer, simultaneously
So that three elastomers is kept coaxial by the through-hole at its center and screw rod 2 is made to be located on the central axes of elastomer, inner sleeve 7 and outside
Sleeve 8 has structural support effect for protect the detection arm optical fiber being wrapped on three elastomers, inner sleeve 7 and outside
The combination of sleeve 8, which makes entirely to pop one's head in, has enough structural strengths, and sealing bucket 9 is for placing 3 × 3 couplers 13, reference arm light
Fibre 15 and emptying end optical fiber 17 and No.1 FRM speculums 18, while detection arm optical fiber 16 being made to lead to inside inner sleeve 7, seal bucket
Lid 10 is closed for that will seal bucket 9, while being provided with aperture above and being passed through for input optical fibre 14, and installation sleeve 11 is for being fixedly mounted
Entire detection probe is fixed on above examined object by holder 12, mounting bracket 12；
The input optical fibre 14 of 3 × 3 coupler 13 has three, is introduced by the aperture sealed on bung 10, two defeated
Enter optical fiber connection No.1 20, No. two photodetectors 21 of photodetector, one inputs light wave by fiber laser light source 22；It is described
The output end of 3 × 3 couplers 13 is respectively reference arm optical fiber 15, detection arm optical fiber 16 and emptying end optical fiber 17, wherein reference arm
Optical fiber 15 and emptying end optical fiber 17 are placed on inside sealing bucket 9, and detection arm optical fiber 16 is wrapped on elastomer, the reference arm light
The end connection No.1 FRM speculums 18 of fibre 15, the end of the detection arm optical fiber 16 connects No. two FRM speculums 19, described
The return light of light wave of the FRM speculums for transmission and reflection to optical fiber connector, detection arm optical fiber 16 and reference arm optical fiber 15 is passed through
It is interfered after 3X3 couplers 13, the interference light is exactly the detectable signal popped one's head in；The light transmitted in the emptying end optical fiber 17
Wave does not reflect, and finally projects light path in optical fiber connector.
The assemble sequence entirely popped one's head in is as follows：
1. by No.1 II type gaskets 3a, No.1 elastomer 4a, No.1 I type gaskets 5a, No. two elastomer 4b, No. two I type pads
Piece 5b, No. three elastomer 4c, No. two II type gaskets 3b sequentially pass through screw rod 2, in No.1 II type gasket 3a and No. two II type gaskets
The both ends locking nut of 3b makes elastomer and gasket fix and is locked on screw rod 2.In upper end cover 1 and installation sleeve 12
Both ends split nut is that entire probe is fixed and is locked on screw rod.
2. detection arm optical fiber is wrapped in successively on No.1 elastomer 4a, No. two elastomer 4b and No. three elastomer 4c, bullet
Property body influenced by external sound wave after vibrate, drive length, the refractive index of detection arm optical fiber to change, that is, connect
Quiet down wave modulation.
3. being respectively locked at inner sleeve 7 and outer sleeve 8 on screw rod 2 by upper end cover 1 and bottom end cover 6, pass through upper end cover 1
Inner sleeve 7 and outer sleeve 8 is set to keep concentric and 2 axis at its center of screw rod with the through-hole and assembly annulus at 6 center of bottom end cover.
4. sealing drum 9 and sealing cover 10 and installation sleeve 11 are fixed on screw rod 2, mounting bracket 12 is fixed on
In installation sleeve 11.
The outer wall of the elastomer is using being made after magnesium alloy fusion drawn, wall thickness 0.1mm.
The No.1 I type gasket 5a and No. two I type gaskets 5b all have I type gaskets assembly edge, the assembly edge with
The inside edge of elastomer is interference fit.
The No.1 II type gasket 3a and No. two II type gaskets 3b all have II type gaskets assembly edge, the assembly edge
Inside edge with elastomer is interference fit.
The outer sleeve is made using the punching net of aperture 1mm.
Optical fiber, 3 × 3 couplers and FRM speculums used in the present invention are all designed using polarization-maintaining device, to prevent partially
Polarization state impacts the interference of reflected light.
The invention has the advantages that：
1, the optical fiber acoustic detection probe provided by the present invention for leakage monitoring system uses fiber-optic probe technology, whole
It is integrally passive without using electric power in a probe；For the first time by optical fiber sensing technology, the probe application of bobbin-type single armed wound form
In the ultrasonic monitoring of oil station leakage.
2, optical fiber, the 3x3 used for the optical fiber acoustic detection probe of leakage monitoring system that this practical information is provided
Coupler and FRM speculums are all designed using polarization-maintaining device, can prevent polarization state from being impacted to the interference of reflected light；
3, the screw rod of the optical fiber acoustic detection probe provided by the present invention for leakage monitoring system and mounting bracket do not have
There are installation relation, mounting bracket to be fixed in examined object, the vibration generated by examined object is transmitted to mounting bracket not
It can continue to be transmitted on other components of probe by screw rod, increase the anti-seismic performance of probe；
4, the outer wall of the elastomer of the optical fiber acoustic detection probe provided by the present invention for leakage monitoring system is to make
With what is be made after magnesium alloy fusion drawn, wall thickness only has 0.1mm, has very high sensitivity；
5, the outer sleeve of the optical fiber acoustic detection probe provided by the present invention for leakage monitoring system uses aperture 1mm
Punching net be made, compared to the common mesh grid of popping one's head in, this punching net hardness higher, more resistant to impact.
Description of the drawings
Fig. 1 is the schematic diagram of the optical fiber acoustic detection probe of the present invention for leakage monitoring system；
Fig. 2 is the Structure explosion diagram of the optical fiber acoustic detection probe of the present invention for leakage monitoring system；
Fig. 3 show the structural schematic diagram of upper end cover；
Fig. 4 show the structural schematic diagram of II type gaskets；
Fig. 5 show the structural representation of I type gaskets；
Fig. 6 show the structural schematic diagram of sealing bucket；
Fig. 7 show the structural schematic diagram of sealing bung；
Fig. 8 show the structural schematic diagram of installation set bucket；
Fig. 9 show the structural schematic diagram of mounting bracket；
Figure 10 show the structural schematic diagram of optic fibre light path part.
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram of the optical fiber acoustic detection probe of the present invention for leakage monitoring system；Fig. 2 is the present invention
The Structure explosion diagram of the optical fiber acoustic detection probe for leakage monitoring system；Fig. 3 show the structural representation of upper end cover
Figure；Fig. 4 show the structural schematic diagram of II type gaskets；Fig. 5 show the structural representation of I type gaskets；Fig. 6 show sealing bucket
Structural schematic diagram；Fig. 7 show the structural schematic diagram of sealing bung；Fig. 8 show the structural schematic diagram of installation set bucket；Fig. 9 institutes
It is shown as the structural schematic diagram of mounting bracket；Figure 10 show the structural schematic diagram of optic fibre light path part.
The technical solution adopted by the present invention is：A kind of optical fiber acoustic detection probe for leakage monitoring system, the spy
Head includes structure installation and optic fibre light path two parts, and the structure installation section includes upper end cover 1, screw rod 2, No.1 II type gaskets
3a, No.1 elastomer 4a, No.1 I type gaskets 5a, No. two elastomer 4b, No. two I type gaskets 5b, No. three elastomer 4c, No. two II
Type gasket 3b, bottom end cover 6, inner sleeve 7, outer sleeve 8, sealing bucket 9, sealing bung 10, installation sleeve 11, mounting bracket 12；Institute
It includes 3 × 3 couplers 13, input optical fibre 14, reference arm optical fiber 15, detection arm optical fiber 16, emptying end light to state optic fibre light path part
18, No. two fibre 17, No.1 FRM speculums FRM speculums 19, No.1 photodetector 20, No. two photodetectors 21, optical fiber swash
Radiant 22；
Wherein upper end cover 1 and bottom end cover 6 are for fixing and closing inner sleeve 7 and outer sleeve 8, and screw rod 2 is for fixed entire
Detection probe, is the skeleton of detection probe, and No.1 II type gasket 3a and No. two II type gaskets 3b are located at three elastomers two
Outermost is held, plays the role of fixed elastomer, No.1 elastomer 4a, No. two elastomer 4b and No. three elastomer 4c belong to sound wave
Elastomer, wound thereon have detection arm optical fiber, elastic deformation occur under sound wave effect, drive detection arm fibre strain and drawing
It stretches, No.1 I type gasket 5a and No. two I type gaskets 5b are located at No. two both ends elastomer 4b, play the role of connecting elastomer, simultaneously
So that three elastomers is kept coaxial by the through-hole at its center and screw rod 2 is made to be located on the central axes of elastomer, inner sleeve 7 and outside
Sleeve 8 has structural support effect for protect the detection arm optical fiber being wrapped on three elastomers, inner sleeve 7 and outside
The combination of sleeve 8, which makes entirely to pop one's head in, has enough structural strengths, and sealing bucket 9 is for placing 3 × 3 couplers 13, reference arm light
Fibre 15 and emptying end optical fiber 17 and No.1 FRM speculums 18, while detection arm optical fiber 16 being made to lead to inside inner sleeve 7, seal bucket
Lid 10 is closed for that will seal bucket 9, while being provided with aperture above and being passed through for input optical fibre 14, and installation sleeve 11 is for being fixedly mounted
Entire detection probe is fixed on above examined object by holder 12, mounting bracket 12；
The input optical fibre 14 of 3 × 3 coupler 13 has three, is introduced by the aperture sealed on bung 10, two defeated
Enter optical fiber and be separately connected 20, No. two photodetectors 21 of No.1 photodetector, one inputs light wave by fiber laser light source 22；
The output end of 3 × 3 coupler 13 is respectively reference arm optical fiber 15, detection arm optical fiber 16 and emptying end optical fiber 17, wherein joining
It examines arm optical fiber 15 and emptying end optical fiber 17 is placed on inside sealing bucket 9, detection arm optical fiber 16 is wrapped on elastomer, the reference
The end connection No.1 FRM speculums 18 of arm optical fiber 15, the end of the detection arm optical fiber 16 connect No. two FRM speculums 19,
Light wave of the FRM speculums for transmission and reflection to optical fiber connector, the return light of detection arm optical fiber 16 and reference arm optical fiber 15
It is interfered after 3 × 3 couplers 13, the interference light is exactly the detectable signal popped one's head in；It is passed in emptying end optical fiber 17
Defeated light wave does not reflect, and finally projects light path in optical fiber connector.
The assemble sequence entirely popped one's head in is as follows：
1. by No.1 II type gaskets 3a, No.1 elastomer 4a, No.1 I type gaskets 5a, No. two elastomer 4b, No. two I type pads
Piece 5b, No. three elastomer 4c, No. two II type gaskets 3b sequentially pass through screw rod 2, in No.1 II type gasket 3a and No. two II type gaskets
The both ends locking nut of 3b makes elastomer and gasket fix and is locked on screw rod 2.
2. detection arm optical fiber is wrapped in successively on No.1 elastomer 4a, No. two elastomer 4b and No. three elastomer 4c, bullet
Property body influenced by external sound wave after vibrate, drive length, the refractive index of detection arm optical fiber to change, that is, connect
Quiet down wave modulation.
3. being respectively locked at inner sleeve 7 and outer sleeve 8 on screw rod 2 by upper end cover 1 and bottom end cover 6, pass through upper end cover 1
Inner sleeve 7 and outer sleeve 8 is set to keep concentric and 2 axis at its center of screw rod with the through-hole and assembly annulus at 6 center of bottom end cover.
4. sealing drum 9 and sealing cover 10 and installation sleeve 11 are fixed on screw rod 2, mounting bracket 12 is fixed on
In installation sleeve 11.
The outer wall of the elastomer after magnesium alloy fusion drawn using being made, wall thickness 0.1mm.
The No.1 I type gasket 5a and No. two I type gaskets 5b all have I type gaskets assembly edge, the assembly edge with
The inside edge of elastomer is interference fit.
The No.1 II type gasket 3a and No. two II type gaskets 3b all have II type gaskets assembly edge, the assembly edge
Inside edge with elastomer is interference fit.
The outer sleeve is made using the punching net of aperture 1mm.
Optical fiber, 3x3 couplers and FRM speculums used in the present invention are all designed using polarization-maintaining device, to prevent partially
Polarization state impacts the interference of reflected light.
Claims (6)
1. a kind of optical fiber acoustic detection probe for leakage monitoring system, it is characterised in that：The probe includes structure installation
With optic fibre light path two parts, the structure installation section includes upper end cover (1), screw rod (2), No.1 II types gasket (3a), No.1
Elastomer (4a), No.1 I types gasket (5a), No. two elastomers (4b), No. two I types gaskets (5b), No. three elastomers (4c), No. two
II types gasket (3b), bottom end cover (6), inner sleeve (7), outer sleeve (8), sealing bucket (9), sealing bung (10), installation sleeve
(11), mounting bracket (12)；The optic fibre light path part includes 3 × 3 couplers (13), input optical fibre (14), reference arm optical fiber
(15), detection arm optical fiber (16), emptying end optical fiber (17), No.1 FRM speculums (18), No. two FRM speculums (19)；
Wherein upper end cover (1) and bottom end cover (6) are for fixing and closing inner sleeve (7) and outer sleeve (8), and screw rod (2) is for solid
Fixed entire detection probe, is the skeleton of detection probe, No.1 II types gasket (3a) and No. two II types gaskets (3b) are located at three
A elastomer both ends outermost plays the role of fixed elastomer, No.1 elastomer (4a), No. two elastomers (4b) and No. three bullets
Property body (4c) belong to acousto-elastic body, wound thereon has detection arm optical fiber, and elastic deformation occurs under sound wave effect, drives detection
Arm fibre strain and stretching, No.1 I types gasket (5a) and No. two I types gaskets (5b) are located at No. two elastomer (4b) both ends, play
The effect of elastomer is connected, while so that three elastomers is kept coaxial by the through-hole at its center and screw rod (2) is made to be located at elasticity
On the central axes of body, inner sleeve (7) and outer sleeve (8) are used to protect the detection arm optical fiber being wrapped on three elastomers, and
With structural support effect, the combination of inner sleeve (7) and outer sleeve (8), which makes entirely to pop one's head in, has enough structural strengths, sealing
Bucket (9) is for placing 3 × 3 couplers (13), reference arm optical fiber (15) and emptying end optical fiber (17) and No.1 FRM speculums
(18), while detection arm optical fiber (16) being made to lead to inner sleeve (7) inside, sealing bung (10) will be for that will seal bucket (9) closing, together
When above be provided with aperture and passed through for input optical fibre (14), installation sleeve (11) is used for mounting bracket (12), mounting bracket
(12) entire detection probe is fixed on above examined object；
The input optical fibre (14) of 3 × 3 coupler (13) has three, is introduced by the aperture sealed on bung (10), two
Input optical fibre is separately connected No.1 photodetector (20), No. two photodetectors (21), and one by fiber laser light source (22)
Input light wave；The output end of 3 × 3 coupler (13) is respectively reference arm optical fiber (15), detection arm optical fiber (16) and emptying
Optical fiber (17), wherein reference arm optical fiber (15) and emptying end optical fiber (17) is held to be placed on sealing bucket (9) inside, detect arm optical fiber
(16) it is wrapped on elastomer, the end connection No.1 FRM speculums (18) of the reference arm optical fiber (15), the detection arm light
No. two FRM speculums (19) of end connection of fine (16), light wave of the FRM speculums for transmission and reflection to optical fiber connector,
The return light of detection arm optical fiber (16) and reference arm optical fiber (15) interferes after 3 × 3 couplers (13), the interference light
The detectable signal exactly popped one's head in；The light wave transmitted in the emptying end optical fiber (17) does not reflect, and is finally projected in optical fiber connector
Light path；
The assemble sequence entirely popped one's head in is as follows：
1) is by No.1 II types gasket (3a), No.1 elastomer (4a), No.1 I types gasket (5a), No. two elastomers (4b), No. two I
Type gasket (5b), No. three elastomers (4c), No. two II types gaskets (3b) sequentially pass through screw rod (2), in No.1 II types gasket (3a)
With the both ends locking nut of No. two II types gaskets (3b), so that elastomer and gasket is fixed and be locked on screw rod (2)；
2) will detect arm optical fiber (16) and be wrapped in No.1 elastomer (4a), No. two elastomers (4b) and No. three elastomers successively
On (4c), elastomer vibrates after being influenced by external sound wave, and length, the refractive index of detection arm optical fiber is driven to become
Change, that is, reception sound wave modulation；
3) inner sleeve (7) and outer sleeve (8) are locked at by upper end cover (1) and bottom end cover (6) on screw rod (2) by respectively, are passed through
The through-hole and assembly annulus at upper end cover (1) and bottom end cover (6) center make inner sleeve (7) and outer sleeve (8) keep concentric and screw rod
(2) axis at its center；
4) sealing drum (9) and sealing cover (10) and installation sleeve (11) are fixed on screw rod (2) by, by mounting bracket
(12) it is fixed in installation sleeve (11).
2. being used for the optical fiber acoustic detection probe of leakage monitoring system according to claim 1, it is characterised in that：The elasticity
The outer wall of body after magnesium alloy fusion drawn using being made, wall thickness 0.1mm.
3. being used for the optical fiber acoustic detection probe of leakage monitoring system according to claim 1, it is characterised in that：The No.1
I types gasket (5a) and No. two I types gaskets (5b) all have I type gaskets assembly edge, the inner edge at the assembly edge and elastomer
Edge is interference fit.
4. being used for the optical fiber acoustic detection probe of leakage monitoring system according to claim 1, it is characterised in that：The No.1
II types gasket (3a) and No. two II types gaskets (3b) all have II type gaskets assembly edge, it is described assembly edge and elastomer it is interior
Edge is interference fit.
5. being used for the optical fiber acoustic detection probe of leakage monitoring system according to claim 1, it is characterised in that：The housing
Cylinder (8) is made using the punching net of aperture 1mm.
6. according to the optical fiber acoustic detection probe for being used for leakage monitoring system described in claim 1 to 5 any bar, feature exists
In：Used optical fiber, 3x3 couplers and FRM speculums are all designed using polarization-maintaining device, to prevent polarization state to reflected light
Interference impact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931546.7A CN108709895A (en) | 2018-08-16 | 2018-08-16 | A kind of optical fiber acoustic detection probe for leakage monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931546.7A CN108709895A (en) | 2018-08-16 | 2018-08-16 | A kind of optical fiber acoustic detection probe for leakage monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108709895A true CN108709895A (en) | 2018-10-26 |
Family
ID=63873398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810931546.7A Pending CN108709895A (en) | 2018-08-16 | 2018-08-16 | A kind of optical fiber acoustic detection probe for leakage monitoring system |
Country Status (1)
| Country | Link |
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| CN (1) | CN108709895A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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