CN109406440A - Gas detection method based on chalcogenide glass suspention core fibre - Google Patents
Gas detection method based on chalcogenide glass suspention core fibre Download PDFInfo
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- CN109406440A CN109406440A CN201811380043.1A CN201811380043A CN109406440A CN 109406440 A CN109406440 A CN 109406440A CN 201811380043 A CN201811380043 A CN 201811380043A CN 109406440 A CN109406440 A CN 109406440A
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- 239000000835 fiber Substances 0.000 title claims abstract description 157
- 239000005387 chalcogenide glass Substances 0.000 title claims abstract description 110
- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 189
- 238000001228 spectrum Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000011265 semifinished product Substances 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 22
- 238000001157 Fourier transform infrared spectrum Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 3
- ZZIZZTHXZRDOFM-XFULWGLBSA-N tamsulosin hydrochloride Chemical compound [H+].[Cl-].CCOC1=CC=CC=C1OCCN[C@H](C)CC1=CC=C(OC)C(S(N)(=O)=O)=C1 ZZIZZTHXZRDOFM-XFULWGLBSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 36
- 238000012544 monitoring process Methods 0.000 abstract description 16
- 239000003245 coal Substances 0.000 abstract description 12
- 230000002269 spontaneous effect Effects 0.000 abstract description 5
- 231100001261 hazardous Toxicity 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004451 qualitative analysis Methods 0.000 abstract description 4
- 238000004445 quantitative analysis Methods 0.000 abstract description 4
- 231100000331 toxic Toxicity 0.000 abstract description 4
- 230000002588 toxic effect Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000004069 differentiation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010000372 Accident at work Diseases 0.000 description 1
- 229910017000 As2Se3 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052958 orpiment Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012360 testing method 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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Gas detection method disclosed by the invention based on chalcogenide glass suspention core fibre; gas detection is realized by building special gas detection platform; the gas detection platform structure is simple, is easy to build; it designs special gas compartment and carries out effective protection to chalcogenide glass suspention core fibre; according to the corresponding wave-length coverage difference in the corresponding strongly absorbing region domain of gas to be detected, it can be achieved that the type differentiation of gas and measurement of concetration；The gas detection platform is based on chalcogenide glass suspention core fibre gas sensor and builds, and detects the high sensitivity of optical signal, small spectrum change can be detected, and can express light with the curve image visualized through the variation of spectrum；The detection method can carry out qualitative and quantitative analysis and detection to the multiple gases including methane gas, can be widely applied to the fields such as coal mine gas monitoring and warning, coal mine spontaneous fire monitoring and warning, toxic and harmful gas or monitoring of hazardous gas early warning.
Description
Technical field
The present invention relates to gas sensing techniques field, specifically a kind of gas detection based on chalcogenide glass suspention core fibre
Method.
Background technique
The energy is the important material base of human survival and development, is related to national economy and national security.In the energy
During exploitation utilizes, safety in production becomes an important topic in economic development.In recent years, safety in production is given by country
Great attention, industrial accident total amount is on a declining curve, but severe and great casualty takes place frequently and endangers serious.
In coal in China field, gas and spontaneous fire are two kinds of major casualties in Safety of Coal Mine Production.For gas
Disaster, gas monitor monitoring system are the main means of monitoring and warning.The main problem of current Coalmine's Monitoring and Controlling System is
Catalytic combustion type sensor used there are poor reliability, frequent calibration, the service life is short, range is small the problems such as.Coal mine spontaneous fire
Prediction and warning mainly take gas index analysis and prediction method.Traditional natural ignition Trace gas detection equipment used is main
It is chromatographic analysis system, there is the device is complicated, complicated for operation, analysis speed is slow, can not achieve the problems such as on-line monitoring, limits
Its application range.With technological progress, improved beam tube system replaces part chromatograph using infrared spectrum analyser, adds
Fast detection speed, but have a defect that measurement gaseous species are few, it cannot achieve the olefines trace there are larger cross jamming
Measure gas detection.As it can be seen that the defect of existing detection technique limits coal mine gas inspection and control technique and fire prediction forecast skill
The development of art.
In mid and far infrared, there are a large amount of molecular fingerprint areas, among these just include the quite high methane of content in methane gas
The strongly absorbing region domain of equal gases.For example, penetrating spectrogram according to the mid-infrared light of gas, 3.3~3.6 mum wavelengths correspond to methane gas
Body strongly absorbing region domain infrared in, wherein the absorption intensity at 3.31 μm of wavelength is 1300 of the absorption intensity at 1.33 μm
More times, be more than 160 times of the absorption intensity at 1.66 μm.Fiber gas sensor mainly uses silica fibre for gas at present
What the spectral absorption of body substance (wavelength is less than 2 μm) in the near infrared region was designed, the wave-length coverage of detection is limited, and pole
The cross response between gas may be introduced, therefore limits the application of fiber gas sensor detection.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of outstanding based on chalcogenide glass
The gas detection method of suspended core optical fiber can carry out qualitative and quantitative analysis and inspection to the multiple gases including methane gas
It surveys, can be widely applied to coal mine gas monitoring and warning, coal mine spontaneous fire monitoring and warning, toxic and harmful gas or hazardous gas prison
Survey the fields such as early warning.
The technical scheme of the invention to solve the technical problem is: the gas based on chalcogenide glass suspention core fibre
Detection method, comprising the following steps:
(1) prepare a chalcogenide glass and suspend core fibre in midair, chalcogenide glass suspention core fibre includes the outer tube being wholely set, hangs
Core and multi-disc spacer, the suspended core are suspended at the inside of the outer tube, described in the suspended core and outer tube warp
The connection of multi-disc spacer, the multi-disc spacer is located at the inside of the outer tube and along the length direction of the outer tube
It is arranged, offers several emptying stomatas on the tube wall of the outer tube, airport described in every row is by the length along the outer tube
The spaced multiple airports in direction are spent to constitute；
(2) gas detection platform is built, which includes FTIR spectrum instrument, condenser lens, the first optical fiber
Fixture, chalcogenide glass suspention core fibre, gas compartment, detector, image intensifer and computer, are moved towards on optical platform along optical path
Successively build FTIR spectrum instrument, condenser lens, the first fiber clamp, gas compartment, detector and the image intensifer, and by institute
The output end for the image intensifer stated is connected with the FTIR spectrum instrument, by the FTIR spectrum instrument and the computer phase
Even, first fiber clamp is mounted on three-dimensional adjustable shelf, then fixes the chalcogenide glass suspention core fibre
On first fiber clamp, while the output end for making the chalcogenide glass suspend core fibre in midair passes through the gas
Room；
The gas compartment is hollow structure, and the two sides of the gas compartment offer fiber entrance respectively and optical fiber goes out
Mouthful, several gas accesses are offered on the side wall of the gas compartment, the output end of the chalcogenide glass suspention core fibre is worn
It crosses the fiber entrance and is pierced by from the fiber outlet, the output end face institute of the chalcogenide glass suspention core fibre
The output end for the condenser lens stated, the chalcogenide glass suspend the input of detector described in the output end face of core fibre in midair
It holds, LabVIEW software is installed on the computer；
(3) gas compartment is vacuumized, one group of normal mixture body is then passed through into several gas accesses
It is passed through the gas compartment, then the gas compartment is closed, containing known concentration and type in this group of normal mixture body
Multiple gases；The gas detection platform is opened, it is mixed using this group of standard of LabVIEW software records on the computer
The light of various gases in gas is closed through spectrum；
(4) step (3) are repeated, is penetrated by the light of various gases in other group of normal mixture body of LabVIEW software records
Spectrum, for other group of normal mixture body compared with one group of normal mixture body in step (3), the gaseous species contained are identical,
But the concentration of the various gases in every group of normal mixture body is different；
(5) LabVIEW software is established different according to the light of the various gases recorded in step (3) and step (4) through spectrum
The standard of concentration gas with various is through spectrum；
(6) gas to be detected is passed through the gas compartment by several gas accesses, by the computer
On the light of the LabVIEW software records gas to be detected compared through spectrum, and with the standard established in step (5) through spectrum
Gaseous species to be detected and concentration out.
Preferably, the pipe thickness of the outer tube of the chalcogenide glass suspention core fibre is 40~60 μm, the sky
The aperture of stomata is 50~80 μm, and the spacing between the airport described in adjacent two of length direction of the outer tube is
10~40 μm.
Preferably, four emptying stomatas are offered on the tube wall of the outer tube of the chalcogenide glass suspention core fibre, it is described
Four emptying stomatas along the equally circumferentially spaced of the outer tube.
Preferably, be connected with vacuum evacuation device on the gas compartment, at the fiber entrance of the gas compartment and light
Fine exit is separately installed with rubber seal, the chalcogenide glass suspention core fibre be threaded through two described in rubber seal
On circle；Rubber seal plug is separately installed at several gas accesses of the gas compartment.Rubber seal and rubber seal plug
Gas compartment can be closed, build closed gaseous environment in the case where detecting environment for calibrating gas gas known to concentration, not vulnerable to
To external interference, to facilitate standard through the foundation of spectrum.
Preferably, the MCT-A type HdCdTe that the detector is the manufacture of U.S. Thermo Scientific company is visited
Survey device.
Preferably, the LabVIEW software is the OMNIC image of U.S. Thermo Scientific company exploitation
Processing software.
Preferably, the preparation process of the chalcogenide glass suspention core fibre are as follows:
1. chalcogenide glass suspention core fibre semi-finished product are prepared using extrusion, it is spare；
2. meter calculates the pipe thickness of the outer tube of chalcogenide glass suspention core fibre semi-finished product；
3. building an airport processing platform, which includes femto-second laser, half-wave plate, Glan rib
Mirror, attenuator, electronic shutter, the first aperture, power meter, the first beam splitter, CCD, long cylinder eyepiece, dichroic mirror, luminaire,
Second beam splitter, second orifice diaphragm, focusing objective len, the second fiber clamp, three-dimensional mobile platform, the first naked fibre adapter,
Two naked fibre adapters, controller and computer successively build the femto-second laser, half-wave plate, Glan on optical platform
Prism, attenuator, electronic shutter, the first aperture, the first beam splitter, dichroic mirror, the second beam splitter, second orifice diaphragm,
Focusing objective len and three-dimensional mobile platform install second fiber clamp in the three-dimensional mobile platform, will be described
Electronic shutter is connect with the computer, and by the three-dimensional mobile platform through the controller and the computer
It is connected, while the power meter is connect with first beam splitter, by the dichroic mirror and the long cylinder eyepiece
It is sequentially connected with CCD, second beam splitter is connect with the luminaire；
4. by step, 1. the middle obtained chalcogenide glass suspention core fibre semi-finished product that squeeze are fixed on second fibre clip
On tool, then chalcogenide glass suspention core fibre semi-finished product both ends are fitted with the first naked fibre adapter and the second naked fibre respectively
Orchestration connection；Three-dimensional mobile platform is adjusted, so that chalcogenide glass suspention core fibre semi-finished product is in collimating status, then adjustment is three-dimensional
The pitching of mobile platform is in chalcogenide glass suspention core fibre semi-finished product on one burnishing surface, it is ensured that chalcogenide glass suspends core in midair
Fiber blank can be most clearly shown on the imaging screen of CCD；Start femto-second laser, adjust laser optical path, femtosecond swashs
The final line focus object lens of the center spot of light device focus and perpendicular acting is on the side wall of chalcogenide glass suspention core fibre semi-finished product,
Three-dimensional mobile platform is moved up and down simultaneously, until the side wall of chalcogenide glass suspention core fibre semi-finished product is punched, obtains a sky
Then stomata moves left and right three-dimensional mobile platform, the length direction along the side wall of chalcogenide glass suspention core fibre semi-finished product is continuous
Punching, obtains an emptying stomata；Chalcogenide glass suspention core fibre semi-finished product are rotated by a certain angle later, repeat above-mentioned beat
Hole operation obtains another emptying stomata；Rotation and punch operation are repeated, until obtaining chalcogenide glass suspention core fibre finished product.
Chalcogenide glass used in the present invention suspends core fibre in midair, and the selection of chalcogenide glass raw material used in semi-finished product uses existing skill
Art, suspended core select high-purity chalcogenide glass, such as As2S3、As2Se3, Ge-As-Se, Ge-As-S etc., the selection of outer tube can be with suspended core
It is identical or different, but outer tube is relatively low to purity requirement, can not carry out purification processes in advance.The chalcogenide glass suspends core fibre in midair
Semi-finished product are prepared by existing extrusion, will not be introduced impurity and be caused crystallization, while surface smoothness is high, can effectively drop
The scattering loss of low sensor.The chalcogenide glass suspends core fibre in midair during the preparation process, real by building airport processing platform
The punch operation of airport on the tube wall of present outer tube.The airport processing platform building method is simple, facilitates punching, and beat
It does not need to carry out optical fiber other additional processing when hole, while aperture, number of rows and the spacing of airport can be accurately controlled.
Compared with prior art, the present invention has the advantage that
1, the suspention core fibre of chalcogenide glass used in gas detection method of the present invention penetrates spectrum and superelevation with 1~20 μm of width
It is non-linear, can be realized to methane gas high sensitivity detection；The chalcogenide glass suspend in midair core fibre suspended core bare fibre by
Outer protection of pipe, good reliability, and the airport opened up on outer tube are conducive to gas to be detected and pass rapidly through in outer tube and outer tube
Bare fibre directly contact, guarantee highly sensitive, it is ensured that the accuracy of testing result；
2, gas detection method of the present invention realizes gas detection, the gas built by building special gas detection platform
Detection platform structure is simple, is easy to build, and designs special gas compartment and carries out effective protection to chalcogenide glass suspention core fibre,
It is different according to the corresponding wave-length coverage in the corresponding strongly absorbing region domain of gas to be detected, it can be achieved that being distinguished to the type of gas and dense
Degree measurement；The gas detection platform is based on chalcogenide glass suspention core fibre gas sensor and builds, and detects the sensitivity of optical signal
Height is able to detect that small spectrum change, and can be expressed light with the curve image visualized through the variation of spectrum；This
Invention gas detection method can carry out qualitative and quantitative analysis and detection to the multiple gases including methane gas, can be wide
It is general to be applied to coal mine gas monitoring and warning, coal mine spontaneous fire monitoring and warning, toxic and harmful gas or monitoring of hazardous gas early warning
Equal fields.
Detailed description of the invention
Fig. 1 suspends the appearance diagram of core fibre in midair for chalcogenide glass used in embodiment；
Fig. 2 suspends the schematic cross-section of core fibre in midair for chalcogenide glass used in embodiment；
Fig. 3 is the structure connection diagram for the gas detection platform built in embodiment；
Fig. 4 is the structure connection diagram for the airport processing platform built in embodiment；
Fig. 5 is the permeability curve of various concentration methane；
Fig. 6 is the relational graph of transmitance and methane concentration.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The gas detection method based on chalcogenide glass suspention core fibre of embodiment 1, comprising the following steps:
(1) prepare a chalcogenide glass and suspend core fibre 1 in midair, as depicted in figs. 1 and 2, chalcogenide glass suspention core fibre 1 includes
Outer tube 11, suspended core 12 and four spacers 13 being wholely set, in the present embodiment 1, outer tube 11 uses GeAs39Se60Sulphur system glass
Glass, suspended core 1212 use As40Se60Chalcogenide glass, the outer diameter of outer tube 11 is 320 μm, pipe thickness is 50 μm, and suspended core 12 is outstanding to be set
In the inside of outer tube 11, suspended core 12 is connect with outer tube 11 through four spacers 13, and four spacers 13 are located at the inside of outer tube 11
And be arranged along the length direction of outer tube 11, four emptying stomatas are offered on the tube wall of outer tube 11, four emptying stomatas are along outer tube 11
Equally circumferentially spaced, every emptying stomata is by being 50 μm of air along multiple apertures that the length direction of outer tube 11 is arranged at equal intervals
Hole 14 is constituted；Spacing between two adjacent airports 14 of the length direction of outer tube 11 is 20 μm；
(2) gas detection platform is built, as shown in figure 3, the gas detection platform includes FTIR spectrum instrument 61, focuses thoroughly
Mirror 62, the first fiber clamp 63, chalcogenide glass suspention core fibre 1, gas compartment 7, detector 81, image intensifer 82 and computer
83, FTIR spectrum instrument 61, condenser lens 62, the first fiber clamp 63, gas are successively built along optical path trend on optical platform
Room 7, detector 81 and image intensifer 82, and the output end of image intensifer 82 is connected with FTIR spectrum instrument 61, by FTIR spectrum
Instrument 61 is connected with computer 83, and the first fiber clamp 63 is mounted on three-dimensional adjustable shelf 64, then suspends chalcogenide glass in midair core
Optical fiber 1 is fixed on the first fiber clamp 63, while the output end of chalcogenide glass suspention core fibre 1 being made to pass through gas compartment 7；
Gas compartment 7 is hollow structure, the cylindric knot that in the present embodiment 1, gas compartment 7 is long 5cm, diameter of section is 2cm
Structure, the two sides of gas compartment 7 offer fiber entrance 71 and fiber outlet 72 respectively, and a gas is offered on the side wall of gas compartment 7
The output end of body entrance A, chalcogenide glass suspention core fibre 1 pass through fiber entrance 71 and are pierced by from fiber outlet 72, chalcogenide glass
Suspend the output end of the output end face condenser lens 62 of core fibre 1 in midair, chalcogenide glass suspends the output end face detection of core fibre 1 in midair
The input terminal of device 81 is equipped with LabVIEW software on computer 83；
(3) gas compartment 7 is vacuumized, one group of normal mixture body is then passed through gas compartment 7 by gas access A, then
Gas compartment 7 is closed, the multiple gases in this group of normal mixture body containing known concentration and type；It is flat to open gas detection
Platform, using the light of various gases in this group of normal mixture body of LabVIEW software records on computer 83 through spectrum；
(4) step (3) are repeated, is penetrated by the light of various gases in other group of normal mixture body of LabVIEW software records
Spectrum, for other group of normal mixture body compared with one group of normal mixture body in step (3), the gaseous species contained are identical,
But the concentration of the various gases in every group of normal mixture body is different；
(5) LabVIEW software is established different according to the light of the various gases recorded in step (3) and step (4) through spectrum
The standard of concentration gas with various is through spectrum；
(6) gas to be detected is passed through gas compartment 7 by gas access A, by the LabVIEW software records on computer 83
The light of the gas to be detected compares through spectrum with the standard established in step (5) through spectrum and obtains gaseous species to be detected
And concentration.
In the present embodiment 1, detector 81 is that the MCT-A type HdCdTe of U.S. Thermo Scientific company manufacture is visited
Device is surveyed, LabVIEW software is the OMNIC image processing software of U.S. Thermo Scientific company exploitation, condenser lens 62
For ZnS condenser lens.
The preparation process of chalcogenide glass used suspention core fibre 1 in the present embodiment 1 are as follows:
1. chalcogenide glass suspention core fibre semi-finished product 10 are prepared using extrusion, it is spare；
2. meter calculates the pipe thickness of the outer tube 11 of chalcogenide glass suspention core fibre semi-finished product 10；
3. build 14 processing platform of an airport, as shown in figure 4,14 processing platform of airport include femto-second laser 2,
Half-wave plate 31, Glan prism 32, attenuator 33, electronic shutter 34, the first aperture 35, power meter 37, the first beam splitter 36,
CCD 43, long cylinder eyepiece 42, dichroic mirror 41, luminaire 45, the second beam splitter 44, second orifice diaphragm 46, focusing objective len 47,
Two fiber clamps 51, three-dimensional mobile platform 5, the first naked fibre adapter 52, the second naked fibre adapter 53, controller 54 and computer
55, femto-second laser 2, half-wave plate 31, Glan prism 32, attenuator 33, electronic shutter 34, are successively built on optical platform
One aperture 35, the first beam splitter 36, dichroic mirror 41, the second beam splitter 44, second orifice diaphragm 46, focusing objective len 47 and three
Mobile platform 5 is tieed up, the second fiber clamp 51 is installed in three-dimensional mobile platform 5, electronic shutter 34 is connect with computer 55, and
5 via controller 54 of three-dimensional mobile platform is connected with computer 55, while power meter 37 being connect with the first beam splitter 36, it will be double
Look mirror 41 is sequentially connected with long cylinder eyepiece 42 and CCD 43, and the second beam splitter 44 is connect with luminaire 45；
4. by step, 1. the middle obtained chalcogenide glass suspention core fibre semi-finished product 10 that squeeze are fixed on the second fiber clamp 51
On, then by chalcogenide glass suspention 10 both ends of core fibre semi-finished product respectively with the first naked fibre adapter 52 and the second naked fibre adapter
53 connections；Three-dimensional mobile platform 5 is adjusted, so that chalcogenide glass suspention core fibre semi-finished product 10 is in collimating status, then adjusts three
The pitching for tieing up mobile platform 5 is in chalcogenide glass suspention core fibre semi-finished product 10 on a burnishing surface, it is ensured that chalcogenide glass is outstanding
Suspended core fiber blank 10 can be most clearly shown on the imaging screen of CCD 43；Start femto-second laser 2, adjusts laser light
Road, the final line focus object lens 47 of the center spot of femto-second laser 2 focus and perpendicular acting is in chalcogenide glass suspention core fibre half
On the side wall of finished product 10, three-dimensional mobile platform 5 is moved up and down simultaneously, until by the side of chalcogenide glass suspention core fibre semi-finished product 10
Wall is punched, and is obtained an airport 14, is then moved left and right three-dimensional mobile platform 5, suspends core fibre semi-finished product in midair along chalcogenide glass
The length direction of 10 side wall obtains an emptying stomata every 20 μm of constantly punchings；Later by chalcogenide glass suspention core fibre half
Finished product 10 is rotated by 90 °, and repeats above-mentioned punch operation, obtains another emptying stomata；Rotation and punch operation are repeated, until
1 finished product of core fibre is suspended in midair to chalcogenide glass, and appearance diagram is shown in that Fig. 1, schematic cross-section are shown in Fig. 2.
When above-mentioned airport processing platform works, pulsed laser energy passes through half-wave plate 31, Glan prism 32 first and declines
Subtract piece 33 and carry out power regulation, by the power regulation of laser pulse to 24MW；Subsequently into electronic shutter 34, when control exposes
Between, using stray light, the promotion beam quality in the first aperture 35 removal optical path；Subsequent femtosecond laser passes through first point
Beam mirror 36 divides for reflected light and transmitted light, wherein reflected light ingoing power meter 37, and the power of femtosecond laser is detected by power meter 37,
Transmitted light is transferred to dichroic mirror 41, and femtosecond laser is reflexed to the second beam splitter 44, while the light of luminaire 45 by dichroic mirror 41
Also it beats on the second beam splitter 44, femtosecond laser and illumination light are respectively divided into two beams, i.e., downward light beam by the second beam splitter 44
With the light beam upward through the second beam splitter 44, wherein downward light beam further increases light beam by second orifice diaphragm 46
Quality, using the effect of focusing objective len 47 to the chalcogenide glass suspention core fibre semi-finished product 10 being placed in three-dimensional mobile platform 5
Punch operation is carried out on side wall, chalcogenide glass suspends light line focus object lens 47, the second orifice light that core fibre semi-finished product 10 reflect in midair
Late 46, second beam splitter 44, together with through the upward light beam of the second beam splitter 44 through dichroic mirror 41 and long cylinder eyepiece 42 into
Enter CCD 43, by the drill process of 43 real-time monitoring femtosecond laser of CCD.
In the above-mentioned gas detection platform course of work, the broadband IR source that FTIR spectrum instrument 61 emits focuses saturating through ZnS
Mirror 62 focuses coupling, and the wide infrared light that ZnS condenser lens 62 exports collimatedly is input to inside chalcogenide glass suspention core fibre 1.
Gas to be detected suspends the airport 14 on core fibre 1 in midair by chalcogenide glass and penetrates into inside chalcogenide glass suspention core fibre 1, to
The gas of detection will generate the absorption of specific wavelength to the light transmitted in optical fiber 1, and the output end that chalcogenide glass suspends core fibre 1 in midair is defeated
Light out will be detected that detection signal returns to FTIR spectrum instrument 61, by computer 83 by amplification by detector 81
LabVIEW software records light is through spectrum.
Since the corresponding wave-length coverage in the corresponding strongly absorbing region domain of every kind of gas to be detected is different, so that above-mentioned gas is examined
Survey method can realize the differentiation to gaseous species, further, since gas concentration is different, it is also different to the trap of light, thus on
High-sensitivity measurement to gas concentration can be realized by stating gas detection method.The gas detection method can be to including methane gas
Multiple gases inside carry out qualitative and quantitative analysis and detection, can be widely applied to coal mine gas monitoring and warning, coal mine and send out naturally
The fields such as thermal monitoring early warning, toxic and harmful gas or monitoring of hazardous gas early warning.
The gas detection method based on chalcogenide glass suspention core fibre of embodiment 2, the difference from embodiment 1 is that, it is real
It applies in example 2, vacuum evacuation device (such as vacuum pump, be not shown in the figure), the fiber entrance 71 of gas compartment 7 is connected on gas compartment 7
Rubber seal (not shown) is separately installed at place and fiber outlet 72, chalcogenide glass suspention core fibre 1 is threaded through two
In a rubber seal, rubber seal plug 73 is installed at the gas access A of gas compartment 7.Rubber seal and rubber seal plug
73 can close gas compartment 7, build closed gaseous environment in the case where detecting environment for calibrating gas gas known to concentration, are not easy
By external interference, to facilitate standard through the foundation of spectrum.In step (3) and step (4), by vacuum evacuation device to gas
After body room 7 vacuumizes, normal mixture body is passed through gas compartment 7 by gas access A, then gas is closed by rubber seal plug 73
Body entrance A.It is worth noting that, only during establishing the standard of various concentration gas with various through spectrum, it is logical to gas compartment 7
After entering normal mixture body, gas compartment 7 need to just be closed.During atual detection (i.e. in step (6)), it is not necessarily to gas compartment
7 closings, but chalcogenide glass suspention core fibre is directly exposed in detection environment, so that gas to be detected is directly entered gas
Room is suspended the airport on core fibre in midair by chalcogenide glass and is penetrated into inside chalcogenide glass suspention core fibre, gas meeting to be detected
The absorption of specific wavelength is generated to the light transmitted in chalcogenide glass suspention core fibre, the output end that chalcogenide glass suspends core fibre in midair is defeated
Light out will be detected by the detector, and detection signal returns to FTIR spectrum instrument, by the LabVIEW on computer by amplification
Software records light compare through spectrum, with the various concentration gas standard that pre-establishes through spectrum obtain gaseous species to be detected and
Concentration.
In embodiment 2, step (3)~step (5) establishes the process that standard penetrates spectrum, by taking methane as an example, such as: by first
The gas that alkane volumetric concentration is 1.5% is passed through gas compartment 7 by gas access A, then with 73 sealing gas entrance of rubber seal plug
A is waited 10 minutes, using the light under the LabVIEW software records methane concentration on computer 83 through spectrum.Repeat above-mentioned behaviour
Make, detection records the light of (volume percent methane is respectively 6%, 10%, 14% in gas) under other different methane concentrations respectively
Through spectrum.Standard under the different methane concentrations of foundation is shown in Fig. 5 and Fig. 6 through spectrum, and wherein Fig. 5 is the transmission of various concentration methane
It writes music line, Fig. 6 is the relational graph of transmitance and methane concentration.In Fig. 6, the corresponding methane volumetric of top-down five curves is dense
Degree is respectively 0,1.5%, 6%, 10%, 14%.
Claims (7)
1. the gas detection method based on chalcogenide glass suspention core fibre, it is characterised in that the following steps are included:
(1) prepare a chalcogenide glass suspend in midair core fibre, the chalcogenide glass suspention core fibre include the outer tube being wholely set, suspended core and
Multi-disc spacer, the suspended core are suspended at the inside of the outer tube, the suspended core and the outer tube through described more
The connection of piece spacer, the multi-disc spacer are located at the inside of the outer tube and set along the length direction of the outer tube
It sets, several emptying stomatas is offered on the tube wall of the outer tube, airport described in every row is by the length along the outer tube
The spaced multiple airports in direction are constituted；
(2) build a gas detection platform, the gas detection platform include FTIR spectrum instrument, condenser lens, the first fiber clamp,
Chalcogenide glass suspends core fibre, gas compartment, detector, image intensifer and computer in midair, on optical platform successively along optical path trend
FTIR spectrum instrument, condenser lens, the first fiber clamp, gas compartment, detector and the image intensifer are built, and will be described
The output end of image intensifer is connected with the FTIR spectrum instrument, and the FTIR spectrum instrument is connected with the computer,
First fiber clamp is mounted on three-dimensional adjustable shelf, the chalcogenide glass suspention core fibre is then fixed on institute
On the first fiber clamp stated, while the output end for making the chalcogenide glass suspend core fibre in midair passes through the gas compartment；
The gas compartment is hollow structure, and the two sides of the gas compartment offer fiber entrance and fiber outlet respectively, institute
Several gas accesses are offered on the side wall for the gas compartment stated, the output end of the chalcogenide glass suspention core fibre passes through described
Fiber entrance and be pierced by from the fiber outlet, gather described in the output end face of the described chalcogenide glass suspention core fibre
The output end of focus lens, the chalcogenide glass suspends the input terminal of detector described in the output end face of core fibre in midair, described
Computer on LabVIEW software is installed；
(3) gas compartment is vacuumized, is then passed through one group of normal mixture body by several gas accesses
The gas compartment, then the gas compartment is closed, it is a variety of containing known concentration and type in this group of normal mixture body
Gas；The gas detection platform is opened, this group of normal mixture of LabVIEW software records on the computer is utilized
The light of various gases is through spectrum in body；
(4) step (3) are repeated, it, should by the light of various gases in other group of normal mixture body of LabVIEW software records through spectrum
For other group of normal mixture body compared with one group of normal mixture body in step (3), the gaseous species contained are identical, but every group
The concentration of various gases in normal mixture body is different；
(5) LabVIEW software establishes various concentration according to the light of the various gases recorded in step (3) and step (4) through spectrum
The standard of gas with various is through spectrum；
(6) gas to be detected is passed through the gas compartment by several gas accesses, by the computer
The light of the LabVIEW software records gas to be detected through spectrum, and compare through spectrum with the standard established in step (5) obtain to
The gaseous species and concentration of detection.
2. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
The pipe thickness of outer tube of chalcogenide glass suspention core fibre be 40~60 μm, the aperture of the airport is 50~80 μm,
Spacing between the airport described in adjacent two of length direction of the outer tube is 10~40 μm.
3. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
Chalcogenide glass suspention core fibre outer tube tube wall on offer four emptying stomatas, the four emptying stomatas are along described outer
Pipe it is equally circumferentially spaced.
4. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
Gas compartment on be connected with vacuum evacuation device, be separately installed with rubber at the fiber entrance of the gas compartment and at fiber outlet
Sealing ring, the described chalcogenide glass suspention core fibre be threaded through two described in rubber seal；If the gas compartment
Dry gas inlet is separately installed with rubber seal plug.
5. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
Detector be the U.S. Thermo Scientific company manufacture MCT-A type HdCdTe detector.
6. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
LabVIEW software be the U.S. Thermo Scientific company exploitation OMNIC image processing software.
7. the gas detection method according to claim 1 based on chalcogenide glass suspention core fibre, it is characterised in that described
Chalcogenide glass suspention core fibre preparation process are as follows:
1. chalcogenide glass suspention core fibre semi-finished product are prepared using extrusion, it is spare；
2. meter calculates the pipe thickness of the outer tube of chalcogenide glass suspention core fibre semi-finished product；
3. building an airport processing platform, which includes femto-second laser, half-wave plate, Glan prism, declines
Subtract piece, electronic shutter, the first aperture, power meter, the first beam splitter, CCD, long cylinder eyepiece, dichroic mirror, luminaire, second
It is beam splitter, second orifice diaphragm, focusing objective len, the second fiber clamp, three-dimensional mobile platform, the first naked fibre adapter, second naked
Fine adapter, controller and computer, successively built on optical platform the femto-second laser, half-wave plate, Glan prism,
Attenuator, electronic shutter, the first aperture, the first beam splitter, dichroic mirror, the second beam splitter, second orifice diaphragm, conglomeration
Mirror and three-dimensional mobile platform install second fiber clamp in the three-dimensional mobile platform, and the electronics is fast
Door is connect with the computer, and the three-dimensional mobile platform is connected through the controller with the computer,
The power meter is connect with first beam splitter simultaneously, by the dichroic mirror and the long cylinder eyepiece and CCD
It is sequentially connected, second beam splitter is connect with the luminaire；
4. by step, 1. the middle obtained chalcogenide glass suspention core fibre semi-finished product that squeeze are fixed on second fiber clamp,
Then by chalcogenide glass suspention core fibre semi-finished product both ends respectively with the first naked fibre adapter and the second naked fibre adapter
Connection；Three-dimensional mobile platform is adjusted, so that chalcogenide glass suspention core fibre semi-finished product is in collimating status, then adjustment is three-dimensional mobile
The pitching of platform is in chalcogenide glass suspention core fibre semi-finished product on one burnishing surface, it is ensured that chalcogenide glass suspends core fibre in midair
Semi-finished product can be most clearly shown on the imaging screen of CCD；Start femto-second laser, adjusts laser optical path, femto-second laser
The final line focus object lens of center spot focus and perpendicular acting is on the side wall of chalcogenide glass suspention core fibre semi-finished product, simultaneously
Three-dimensional mobile platform is moved up and down, until the side wall of chalcogenide glass suspention core fibre semi-finished product is punched, obtains an airport,
Then three-dimensional mobile platform is moved left and right, the length direction along the side wall of chalcogenide glass suspention core fibre semi-finished product constantly punches,
Obtain an emptying stomata；Chalcogenide glass suspention core fibre semi-finished product are rotated by a certain angle later, repeat above-mentioned punching behaviour
Make, obtains another emptying stomata；Rotation and punch operation are repeated, until obtaining chalcogenide glass suspention core fibre finished product.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02162244A (en) * | 1988-12-16 | 1990-06-21 | Hisankabutsu Glass Kenkyu Kaihatsu Kk | Infrared-ray spectrochemical analysis method using fiber |
| CN101042340A (en) * | 2007-04-30 | 2007-09-26 | 西安交通大学 | Detection method for Optical-fiber transmitting infrared absorption type methane gas |
| CN101825563A (en) * | 2010-04-23 | 2010-09-08 | 哈尔滨工程大学 | Distributed fiber-optic gas sensor based on suspension core optic fibers |
| CN202957448U (en) * | 2012-09-14 | 2013-05-29 | 北京工业大学 | Middle and far-infrared super-continuum spectrum fiber laser |
| CN105552699A (en) * | 2016-01-15 | 2016-05-04 | 宁波大学 | Generation method of far infrared super-continuum spectrum |
| CN205449790U (en) * | 2016-01-06 | 2016-08-10 | 内蒙古民族大学 | Spectral absorption type methane detector |
| CN107389597A (en) * | 2017-07-14 | 2017-11-24 | 山西大学 | A kind of highly sensitive gas-detecting device and method |
| CN107907239A (en) * | 2017-10-20 | 2018-04-13 | 宁波大学 | A kind of temperature sensing device and its building method based on chalcogenide glass material |
-
2018
- 2018-11-20 CN CN201811380043.1A patent/CN109406440B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02162244A (en) * | 1988-12-16 | 1990-06-21 | Hisankabutsu Glass Kenkyu Kaihatsu Kk | Infrared-ray spectrochemical analysis method using fiber |
| CN101042340A (en) * | 2007-04-30 | 2007-09-26 | 西安交通大学 | Detection method for Optical-fiber transmitting infrared absorption type methane gas |
| CN101825563A (en) * | 2010-04-23 | 2010-09-08 | 哈尔滨工程大学 | Distributed fiber-optic gas sensor based on suspension core optic fibers |
| CN202957448U (en) * | 2012-09-14 | 2013-05-29 | 北京工业大学 | Middle and far-infrared super-continuum spectrum fiber laser |
| CN205449790U (en) * | 2016-01-06 | 2016-08-10 | 内蒙古民族大学 | Spectral absorption type methane detector |
| CN105552699A (en) * | 2016-01-15 | 2016-05-04 | 宁波大学 | Generation method of far infrared super-continuum spectrum |
| CN107389597A (en) * | 2017-07-14 | 2017-11-24 | 山西大学 | A kind of highly sensitive gas-detecting device and method |
| CN107907239A (en) * | 2017-10-20 | 2018-04-13 | 宁波大学 | A kind of temperature sensing device and its building method based on chalcogenide glass material |
Non-Patent Citations (5)
| Title |
|---|
| TANYA M. MONRO ET AL: "Sensing with suspended-core optical fibers", 《OPTICAL FIBER TECHNOLOGY》 * |
| 李蓉蓉 等: "基于光谱吸收CH4传感器灵敏度的分析", 《现代电子技术》 * |
| 汪翠 等: "基于硫系玻璃光纤的红外超连续谱的研究进展", 《激光与光电子学进展》 * |
| 祝清德 等: "硫系As2S3悬吊芯光纤制备及其光谱性能研究", 《光学学报》 * |
| 褚状状 等: "有害气体检测的光纤传感技术发展", 《传感器与微系统》 * |
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