CN107238580A - Self-calibration gas chamber and distributed optical fiber methane sensing system - Google Patents
Self-calibration gas chamber and distributed optical fiber methane sensing system Download PDFInfo
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- CN107238580A CN107238580A CN201710418792.8A CN201710418792A CN107238580A CN 107238580 A CN107238580 A CN 107238580A CN 201710418792 A CN201710418792 A CN 201710418792A CN 107238580 A CN107238580 A CN 107238580A
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- fiber collimator
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- housing
- collimator
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 149
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims description 14
- 239000003822 epoxy resin Substances 0.000 claims description 14
- 229920000647 polyepoxide Polymers 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 5
- 238000004382 potting Methods 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 36
- 238000000034 method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a self-calibration air chamber which comprises a potting box, a shell, an optical fiber collimator I and an optical fiber collimator II, wherein the shell, the optical fiber collimator I and the optical fiber collimator II are fixed in the potting box in a potting mode; the tail fiber I of the optical fiber collimator I and the tail fiber II of the optical fiber collimator II are respectively led out from optical fiber outlets at two sides of the encapsulating box; the device has the advantages of simple structure, convenience in manufacturing and processing, simple light path adjusting mode, high sealing performance and higher measurement precision; meanwhile, the invention also discloses a distributed optical fiber methane sensing system applying the self-calibration gas chamber.
Description
Technical field
The present invention relates to coal mine gas monitoring technical field, more particularly to a kind of self calibration air chamber and distribution type fiber-optic methane
Sensor-based system.
Background technology
Safety problem is to perplex the major issue of coal production at this stage, and wherein Gas Disaster is the primary disaster in colliery,
Account for more than the 70% of national colliery major accident sum.Gas monitor occupies protrusion in underground coal mine monitoring and controlling system always
Position.Existing gas monitor technology, carrier catalysis principle methane transducer exist measurement not accurate enough, the adjustment cycle it is short,
Measurement range is narrow, the problems such as easily disturbed by environmental gas；Infrared methane based on " NDIR detection " (NDIR) technology is passed
Sensor, overcomes most of problem therein, but there is also be relatively vulnerable to the interference of other alkanes gases, be difficult to carry out it is long away from
The problems such as from, distributed measurement.It is excellent that distribution type fiber-optic methane sensing system is using LASER Light Source spectral line is narrow, energy density is high
Point, with reference to existing ripe optical fiber sensing network technology, high with measurement accuracy and the degree of accuracy, strong antijamming capability can be completed
Over long distances, the application characteristic such as Distributed Detection, is significant for lifting coal mine gas monitoring validity.Self calibration air chamber
It is the important component of distribution type fiber-optic methane sensing system, coordinates corresponding signal processing method, LASER Light Source can be achieved
Spectral line and the self-calibration function that matches of methane adsorption spectral line, improve the stability of sensor-based system longtime running.
Existing self calibration air chamber structure is complicated, and the closed gas for being used for accommodating self-calibration gas is provided with generally in housing
Body container, injection window and injection window of the wall provided with least one pair of printing opacity of container, laser beam passes through incidence window
Into container, in a reservoir with leaving container by exit window after sealing gas effect and carrying out photodetection.This method swashs
Light light beam passes in and out container, and light path Adjustment precision requires high, and light interference phenomena easily occur in two optical windows, and it is reliable that reduction is detected
Property, and cost is higher.
Existing self calibration air chamber independently of Measurement channel outside, individually take optical path signal all the way, reduce power system capacity,
Add system cost.In addition, the self-calibration function of multiple Measurement channels, is adjusted, nothing using same calibration signal source is unified
Method realizes the accurate calibration function to single-measurement passage.
The content of the invention
In view of this, it is an object of the invention to provide a kind of self calibration air chamber, its is simple in construction, be easy to manufacture to process,
Light path adjustment mode is simple, and sealing is high, it is ensured that with higher measurement accuracy；Meanwhile, the present invention also provides a kind of application
The distribution type fiber-optic methane sensing system of the self calibration air chamber.
The self calibration air chamber of the present invention, including embedding box and embedding are fixed on housing, the and of optical fiber collimator I in embedding box
Optical fiber collimator II, the housing is provided with the gas held chamber for being used for accommodating self-calibration gas and its left and right sides is arranged with admittedly
Reservation I and fixed seat II, the optical fiber collimator I being fixed in fixed seat I and the optical fiber collimator II being fixed in fixed seat II
Align；The fiber outlet of the tail optical fiber I of optical fiber collimator I and the tail optical fiber II of optical fiber collimator II respectively from embedding box both sides draws
Go out.
Further, in the embedding box by filling epoxy resin to housing, optical fiber collimator I and optical fiber collimator II
Embedding is carried out to fix.
Further, the fixed seat I and fixed seat II include the heavy platform being recessed by housing side and are located at heavy platform
Make the intercommunicating pore that the two is connected between gas held chamber, at least three symmetrically arranged lock-screw spirals penetrate heavy platform and propped up
Support corresponding optical fiber collimator.
Further, the bottom of the heavy platform is provided with limited block, and the limited block is enclosed on outside corresponding optical fiber collimator and shape
Radially support.
Further, the housing is made of stainless steel material, and the fixed seat I and fixed seat II are integrally formed setting
In housing.
The present invention distribution type fiber-optic methane sensing system, including for launch laser laser and along laser optical path according to
Self calibration air chamber, beam splitter and the Measurement channel of secondary connection, the Measurement channel are set up in parallel at least two-way, and each measurement is led to
Road includes measurement air chamber and photodetector, and laser beam enters photodetector by measuring after air chamber；The self calibration
Air chamber is fixed on housing, optical fiber collimator I and optical fiber collimator II in embedding box including embedding box and embedding, and the housing is set
There is the gas held chamber for accommodating self-calibration gas and its left and right sides is arranged with fixed seat I and fixed seat II, be fixed on
Optical fiber collimator I in fixed seat I and the optical fiber collimator II being fixed in fixed seat II are aligned；Optical fiber collimator I
The tail optical fiber II of tail optical fiber I and optical fiber collimator II is drawn from the fiber outlet of embedding box both sides respectively.
Further, in the embedding box by filling epoxy resin to housing, optical fiber collimator I and optical fiber collimator II
Embedding is carried out to fix.
Further, the fixed seat I and fixed seat II include the heavy platform being recessed by housing side and are located at heavy platform
Make the intercommunicating pore that the two is connected between gas held chamber, at least three symmetrically arranged lock-screw spirals penetrate heavy platform and propped up
Support corresponding optical fiber collimator.
Further, the bottom of the heavy platform is provided with limited block, and the limited block is enclosed on outside corresponding optical fiber collimator and shape
Radially support.
Further, the housing is made of stainless steel material, and the fixed seat I and fixed seat II are integrally formed setting
In housing.
The present invention has the advantages that：
The self calibration air chamber of the present invention, fixed seat I and fixed seat II are symmetrically arranged on housing, only need to protect during manufacture processing
The machining accuracy of card fixed seat I and fixed seat II can be that optical fiber collimator I and aligning for optical fiber collimator II provide well
Basis, it is simple in construction, be easy to manufacture process；Carried out by way of adjusting optical fiber collimator I and the position degree of optical fiber collimator II
Light path is adjusted, simple possible；Housing, optical fiber collimator I and the embedding of optical fiber collimator II are fixed in embedding box, and sealing is high,
Sealing means are simple, it is ensured that seal tight when using, so as to ensure there is higher measurement accuracy.
The distribution type fiber-optic methane sensing system of the present invention applies above-mentioned self calibration air chamber, with above-mentioned beneficial effect
While, because self calibration air chamber is located between laser and Measurement channel, power system capacity is improved, system cost is reduced,
The accurate calibration function to single-measurement passage can be achieved.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the structural representation of the self calibration air chamber of the present invention；
Fig. 2 is the structural representation of the distribution type fiber-optic methane sensing system of the present invention.
Embodiment
Embodiment one
As shown in Figure 1：The self calibration air chamber of the present embodiment, including embedding box 1 and embedding are fixed on the housing in embedding box 1
2nd, optical fiber collimator I 3 and optical fiber collimator II 4, the housing 2 be provided be used for accommodate self-calibration gas gas held chamber 2a and
Its left and right sides is arranged with fixed seat I 21 and fixed seat II 22, the optical fiber collimator I 3 being fixed in fixed seat I 21 and fixation
Optical fiber collimator II 4 in fixed seat II 22 is aligned；The tail optical fiber I 31 of optical fiber collimator I 3 and optical fiber collimator II 4
Tail optical fiber II 41 is drawn from the fiber outlet 1a of the both sides of embedding box 1 respectively；Housing 2 is cylindrical, and its middle part is provided with passage；Optical fiber
Collimater I 3 is identical with the structure of optical fiber collimator II 4, and simply when in use, laser beam is entered by the optical fiber collimator I 3 of side
Penetrate, by the outgoing of opposite side optical fiber collimator II 4；Fixed seat I 21 and fixed seat II 22 also have identical structure, in a symmetrical
It is located at the axial both sides of housing 2, the installation that the structure of fixed seat I 21 and fixed seat II 22 is suitable to optical fiber collimator is fixed；Embedding box 1
It is interior to be provided with the location structure of housing 2, it is easy to the placement of housing 2；Fiber outlet 1a is symmetrically arranged at the both sides of embedding box 1；In embedding box 1
Embedding can be carried out to housing 2, optical fiber collimator I 3 and optical fiber collimator II 4 and fixed by filling epoxy resin 5；Due to fixation
Seat I 21 and fixed seat II 22 are symmetrically arranged on housing 2, only need to ensure fixed seat I 21 and fixed seat II 22 during manufacture processing
Machining accuracy can provide good basis for aligning for optical fiber collimator I 3 and optical fiber collimator II 4, simple in construction, be easy to system
Make processing；Light path adjustment, simple possible are carried out by way of adjusting optical fiber collimator I 3 and the position degree of optical fiber collimator II 4；
Housing 2, optical fiber collimator I 3 and the embedding of optical fiber collimator II 4 are fixed in embedding box 1, and sealing is high, and sealing means are simple, are protected
Card seals tight when using, so as to ensure there is higher measurement accuracy.
In the present embodiment, the fixed seat I 21 and fixed seat II 22 include the heavy platform that is recessed by the side of housing 2 and
Be located at the intercommunicating pore for the two being connected between heavy platform and gas held chamber 2a, at least three symmetrically arranged spirals of lock-screw 6
Penetrate heavy platform and support corresponding optical fiber collimator；It is heavy to be connected between platform and gas held chamber 2a by intercommunicating pore；Optical fiber is accurate
Straight device (including optical fiber collimator I 3 and optical fiber collimator II 4) insertion intercommunicating pore is simultaneously fixed by lock-screw 6；Meanwhile, lead to
The position degree for overregulating each lock-screw 6 can adjust the position of optical fiber collimator, so as to realize the three axles regulation of light path；Fixed seat
I 21, the screw of correlation is equipped with fixed seat II 22, to be connected with lock-screw 6；In fixed seat I 21, fixed seat II 22
It is preferably provided with three lock-screws 6, three lock-screws 6 in the way of 120 ° of interval to be arranged circumferentially.
In the present embodiment, the bottom of the heavy platform is provided with limited block 7, and the limited block 7 is enclosed on corresponding optical fiber collimator
It is outer and form radial support；Limited block 7 for example can be rubber block structure, and limited block 7 has certain support and sealing simultaneously
Energy.
In the present embodiment, the housing 2 is made of stainless steel material, and the fixed seat I 21 and fixed seat II 22 are homogeneous
It is body formed to be arranged at housing 2；Fixed seat I 21 and fixed seat II 22 are set using integrally formed mode, be easy to machine-shaping and
Onsite application, and can effectively ensure that the symmetry of fixed seat I 21 and fixed seat II 22, it is ensured that optical fiber collimator I 3 and optical fiber are accurate
The alignment of straight device II 4, while the structural strength of housing 2 can also be improved, extends the service life of self calibration air chamber.
The self calibration air chamber of the present embodiment can be assembled by following step：
Step one, optical fiber collimator I 3 and optical fiber collimator II 4 are respectively placed in the fixed seat I of the left and right sides of housing 2
21 and fixed seat II 22 in, optical fiber collimator is sent to behind fixed seat inside to be coordinated with limited block 7, makes optical fiber collimator beam exit
Mouth is stretched into inside gas held chamber 2a；
Step 2, preliminary to be fixed using lock-screw 6, each fixed seat has three lock-screws 6, by locking screw
Nail 6 is threaded to be contacted with optical fiber collimator metal shell, optical fiber collimator is substantially remained on self calibration air chamber axis.
Step 3, the side of optical fiber collimator I 3 is connected to by red laser light source, light beam after the output of optical fiber collimator I 3,
The opposite side of self calibration gas chamber shell 2 is irradiated to, the lock-screw 6 of optical fiber collimator I 3 is adjusted, light beam is irradiated to optical fiber accurate
The beam exit mouthful of straight device II 4；
Step 4, the side of optical fiber collimator II 4 is connected to by red laser light source, and light beam is exported from optical fiber collimator II 4
Afterwards, the opposite side of housing 2 is irradiated to, the lock-screw 6 of optical fiber collimator II 4 is adjusted, light beam is irradiated to optical fiber collimator I 3
Beam exit mouthful；
Step 5, the side of optical fiber collimator I 3 is connected to by CH_4 detection LASER Light Source, and light beam is defeated from optical fiber collimator I 3
Go out to be irradiated to the center of optical fiber collimator II 4, light power meter is connected into optical fiber collimator II 4, adjust optical fiber collimator I 3
Lock-screw 6 until light power meter be shown as maximum；
Step 6, the side of optical fiber collimator II 4 is connected to by CH_4 detection LASER Light Source, and light beam is from optical fiber collimator II 4
Light power meter is connected optical fiber collimator II 4 by output irradiation to the center of optical fiber collimator I 3, adjusts optical fiber collimator II
4 lock-screw 6 is until light power meter is shown as maximum；
Step 7, repeat step five, six, until light power meter show value reaches qualified index；
Step 8, carries out embedding to optical fiber collimator I 3 and optical fiber collimator II 4 using epoxy resin and fixes, by self calibration
Air chamber is disposed vertically, at the upper side of epoxy resin encapsulated to self calibration air chamber, when after epoxy resin solidification, rotating self calibration
180 ° of air chamber, makes below original side upward, using epoxy resin encapsulated and treats that epoxy resin solidifies；
Step 9, the housing 2 for being provided with optical fiber collimator is positioned in embedding box 1, is positioned with the inner housing 2 of embedding box 1
Respective outer side edges, optical fiber collimator tail optical fiber is drawn from the fiber outlet 1a of the both sides of embedding box 1；
Step 10, the methane gas that concentration is 100% is passed through into gas held chamber 2a using breather pipe by passage,
After methane gas is full of in gas held chamber 2a, takes out breather pipe and temporary sealing is carried out to passage using fluid sealant；
Step 11, embedding is carried out to embedding box 1 using epoxy resin, and epoxy resin should be full of embedding box 1, be completely covered
Internal self calibration air chamber, and install additional and treat that epoxy resin solidifies after lid.
Embodiment two
As depicted in figs. 1 and 2, the distribution type fiber-optic methane sensing system of the present embodiment, including for launching swashing for laser
Light device and self calibration air chamber, beam splitter and the Measurement channel being sequentially connected along laser optical path, the Measurement channel are set up in parallel
At least two-way (shown in figure be eight tunnels), each Measurement channel includes measurement air chamber and photodetector, and laser beam passes through
Measure and enter photodetector after air chamber；The self calibration air chamber is fixed on the housing in embedding box 1 including embedding box 1 and embedding
2nd, optical fiber collimator I 3 and optical fiber collimator II 4, the housing 2 be provided be used for accommodate self-calibration gas gas held chamber 2a and
Its left and right sides is arranged with fixed seat I 21 and fixed seat II 22, the optical fiber collimator I 3 being fixed in fixed seat I 21 and fixation
Optical fiber collimator II 4 in fixed seat II 22 is aligned；The tail optical fiber I of optical fiber collimator I 3 and the tail of optical fiber collimator II 4
Fibre II is drawn from the fiber outlet 1a of the both sides of embedding box 1 respectively；Laser, self calibration air chamber, beam splitter, measurement gas during connection
Room, photodetector are attached using FC/APC fibre-optical splices by fiber adapter；Housing 2 is cylindrical, its middle part
It is provided with passage；Optical fiber collimator I 3 is identical with the structure of optical fiber collimator II 4, and simply when in use, laser beam is by side
Optical fiber collimator I 3 it is incident, by the outgoing of opposite side optical fiber collimator II 4；Fixed seat I 21 and fixed seat II 22 also have identical
Structure, be located at the axial both sides of housing 2 in a symmetrical, the structure of fixed seat I 21 and fixed seat II 22 is suitable to optical fiber collimator
Installation fix；The location structure of housing 2 is provided with embedding box 1, is easy to the placement of housing 2；Fiber outlet 1a is symmetrically arranged at embedding
The both sides of box 1；Housing 2, optical fiber collimator I 3 and optical fiber collimator II 4 can be entered by filling epoxy resin in embedding box 1
Row embedding is fixed；Because fixed seat I 21 and fixed seat II 22 are symmetrically arranged on housing 2, only need to ensure to fix during manufacture processing
The machining accuracy of seat I 21 and fixed seat II 22 can be that optical fiber collimator I 3 and aligning for optical fiber collimator II 4 provide well
Basis, it is simple in construction, be easy to manufacture process；Entered by way of adjusting optical fiber collimator I 3 and the position degree of optical fiber collimator II 4
Row light path is adjusted, simple possible；Housing 2, optical fiber collimator I 3 and the embedding of optical fiber collimator II 4 are fixed in embedding box 1, sealing
Property it is high, sealing means are simple, it is ensured that seal tight when using, so as to ensure there is higher measurement accuracy；Further, since self-correcting
Quasi- air chamber is located between laser and Measurement channel, improves power system capacity, reduces system cost, can be achieved to single-measurement
The accurate calibration function of passage.
In the present embodiment, the fixed seat I 21 and fixed seat II 22 include the heavy platform that is recessed by the side of housing 2 and
Be located at the intercommunicating pore for the two being connected between heavy platform and gas held chamber 2a, at least three symmetrically arranged spirals of lock-screw 6
Penetrate heavy platform and support corresponding optical fiber collimator；It is heavy to be connected between platform and gas held chamber 2a by intercommunicating pore；Optical fiber is accurate
Straight device (including optical fiber collimator I 3 and optical fiber collimator II 4) insertion intercommunicating pore is simultaneously fixed by lock-screw 6；Meanwhile, lead to
The position degree for overregulating each lock-screw 6 can adjust the position of optical fiber collimator, so as to realize the three axles regulation of light path；Fixed seat
I 21, the screw of correlation is equipped with fixed seat II 22, to be connected with lock-screw 6；In fixed seat I 21, fixed seat II 22
It is preferably provided with three lock-screws 6, three lock-screws 6 in the way of 120 ° of interval to be arranged circumferentially.
In the present embodiment, the bottom of the heavy platform is provided with limited block 7, and the limited block 7 is enclosed on corresponding optical fiber collimator
It is outer and form radial support；Limited block 7 for example can be rubber block structure, and limited block 7 has certain support and sealing simultaneously
Energy.
In the present embodiment, the housing 2 is made of stainless steel material, and the fixed seat I 21 and fixed seat II 22 are homogeneous
It is body formed to be arranged at housing 2；Fixed seat I 21 and fixed seat II 22 are set using integrally formed mode, be easy to machine-shaping and
Onsite application, and can effectively ensure that the symmetry of fixed seat I 21 and fixed seat II 22, it is ensured that optical fiber collimator I 3 and optical fiber are accurate
The alignment of straight device II 4, while the structural strength of housing 2 can also be improved, extends the service life of self calibration air chamber.
The following method for self-calibrating of use of the system：Concentration known C is full of in calibration gas chamber0Methane gas, laser light
After beam is by self calibration air chamber, absorption is produced, it is the methane concentration C ' in self calibration air chamber that it, which measures concentration value,0, surveying
In the case of air chamber is measured without methane gas, laser beam is by measuring air chamber, no absorption, if C '0≠C0, then by swashing
Light device temperature-control circuit adjusts laser output wavelength, until C '0=C0, adjustment terminates.
Each Measurement channel is carried out after calibration operation using above-mentioned method for self-calibrating, you can carry out normal methane survey
Amount.
In the case that measurement air chamber has methane gas, laser beam is produced by measuring air chamber and self calibration air chamber
Absorption, it is measurement air chamber methane concentration C that it, which measures concentration value,1' and self calibration air chamber methane concentration C '0Sum C ', measures gas
Room methane concentration can be calculated by below equation：C′1=C '-C '0。
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to skill of the invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (10)
1. a kind of self calibration air chamber, it is characterised in that：Housing, fiber optic collimator in embedding box are fixed on including embedding box and embedding
Device I and optical fiber collimator II, the housing is provided with the gas held chamber for being used for accommodating self-calibration gas and its left and right sides is symmetrical
Provided with fixed seat I and fixed seat II, the optical fiber collimator I being fixed in fixed seat I and the optical fiber being fixed in fixed seat II are accurate
Straight device II is aligned；The tail optical fiber I of optical fiber collimator I and the tail optical fiber II of optical fiber collimator II are respectively from the optical fiber of embedding box both sides
Draw outlet.
2. self calibration air chamber according to claim 1, it is characterised in that：By filling epoxy resin in the embedding box
Embedding is carried out to housing, optical fiber collimator I and optical fiber collimator II to fix.
3. self calibration air chamber according to claim 1, it is characterised in that：The fixed seat I and fixed seat II include by
Heavy platform and be located at the intercommunicating pore for connecting the two between heavy platform and gas held chamber that housing side is recessed, at least three right
The lock-screw spiral set is claimed to penetrate heavy platform and support corresponding optical fiber collimator.
4. self calibration air chamber according to claim 3, it is characterised in that：The bottom of the heavy platform is provided with limited block, described
Limited block is enclosed on outside corresponding optical fiber collimator and forms radial support.
5. self calibration air chamber according to claim 3, it is characterised in that：The housing is made of stainless steel material, institute
State fixed seat I and fixed seat II is integrally formed and is arranged at housing.
6. a kind of distribution type fiber-optic methane sensing system, it is characterised in that：Including for launching the laser of laser and along laser
Self calibration air chamber, beam splitter and Measurement channel that light path is sequentially connected, the Measurement channel are set up in parallel at least two-way, each
Measurement channel includes measurement air chamber and photodetector, and laser beam enters photodetector by measuring after air chamber；It is described
Self calibration air chamber is fixed on housing, optical fiber collimator I and optical fiber collimator II in embedding box including embedding box and embedding, described
Housing is provided with the gas held chamber for being used for accommodating self-calibration gas and its left and right sides is arranged with fixed seat I and fixed seat II,
The optical fiber collimator I being fixed in fixed seat I and the optical fiber collimator II being fixed in fixed seat II are aligned；Fiber optic collimator
The tail optical fiber I of device I and the tail optical fiber II of optical fiber collimator II are drawn from the fiber outlet of embedding box both sides respectively.
7. distribution type fiber-optic methane sensing system according to claim 6, it is characterised in that：By filling out in the embedding box
Fill epoxy resin and embedding is carried out to housing, optical fiber collimator I and optical fiber collimator II and fixed.
8. distribution type fiber-optic methane sensing system according to claim 6, it is characterised in that：The fixed seat I and fixation
Seat II includes the heavy platform being recessed by housing side and is located at the connection for connecting the two between heavy platform and gas held chamber
Hole, at least three symmetrically arranged lock-screw spirals penetrate heavy platform and support corresponding optical fiber collimator.
9. distribution type fiber-optic methane sensing system according to claim 8, it is characterised in that：The bottom of the heavy platform is provided with
Limited block, the limited block is enclosed on outside corresponding optical fiber collimator and forms radial support.
10. distribution type fiber-optic methane sensing system according to claim 8, it is characterised in that：The housing is using stainless
Steel material is made, and the fixed seat I and fixed seat II are integrally formed and are arranged at housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710418792.8A CN107238580A (en) | 2017-06-06 | 2017-06-06 | Self-calibration gas chamber and distributed optical fiber methane sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710418792.8A CN107238580A (en) | 2017-06-06 | 2017-06-06 | Self-calibration gas chamber and distributed optical fiber methane sensing system |
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| Publication Number | Publication Date |
|---|---|
| CN107238580A true CN107238580A (en) | 2017-10-10 |
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ID=59984935
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710418792.8A Pending CN107238580A (en) | 2017-06-06 | 2017-06-06 | Self-calibration gas chamber and distributed optical fiber methane sensing system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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