CN108398421A - A kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope - Google Patents
A kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope Download PDFInfo
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- CN108398421A CN108398421A CN201810437422.3A CN201810437422A CN108398421A CN 108398421 A CN108398421 A CN 108398421A CN 201810437422 A CN201810437422 A CN 201810437422A CN 108398421 A CN108398421 A CN 108398421A
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000007423 decrease Effects 0.000 claims abstract description 14
- 238000002310 reflectometry Methods 0.000 claims description 4
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 abstract description 16
- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000000180 cavity ring-down spectroscopy Methods 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 12
- 238000001228 spectrum Methods 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
-
- 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
-
- 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
- G01N2021/391—Intracavity sample
-
- 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
- G01N2021/396—Type of laser source
- G01N2021/397—Dye laser
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The present invention relates to a kind of enhanced laser induced breakdown spectrographs of distinguishable carbon isotope, including optical cavity, laser and detector, it is equipped with to decline in the optical cavity and swings speculum and light focusing speculum, described decline swings speculum and is set to the both sides of optical cavity and is oppositely arranged, light focusing speculum is located at the bottom of optical cavity, the one side wall of optical cavity is equipped with laser port, the laser is located at laser port, another side wall of optical cavity and top are respectively equipped with the first detection mouth and the second detection mouth, the second detection mouth is oppositely arranged with light focusing speculum, first, it is equipped with a detector at second detection mouth, LIBS technologies and CRDS technologies are combined by the spectrometer, isotope can be distinguished and LIBS imaging effects can be enhanced.
Description
Technical field
The present invention relates to a kind of laser induced breakdown spectroscopy and cavity ring-down spectroscopy isotope imager, more particularly to one kind
The enhanced laser induced breakdown spectrograph of distinguishable carbon isotope.
Background technology
Laser induced breakdown spectroscopy（Laser-induced Breakdown Spectroscopy, LIBS technologies）It is a kind of
Laser ablation spectral analysis technique, laser focus on test site, when the energy density of laser pulse is more than breakdown threshold, i.e.,
Plasma can be generated.It is only respectively usually in atomic emission spectrum technology based on this special plasma Ablation Technique
Three vertical sampling, atomization, excitation steps can once be realized by pulsed laser excitation source.Energy of plasma degenerative process
The middle emission of ions line for generating continuous bremsstrahlung and inner element acquires spectral emissions signal by fiber spectrometer,
The corresponding feature peak intensity of element can be used for the qualitative and quantitative analysis of sample in analysis of spectra, but to be measured in the technology
Sample is generally atmospheric sample, and feature is that test substance content is thin, the LIBS weak output signals that single measures.
Cavity ring down spectroscopy technology（Cavity Ring Down Spectroscopy, CRDS technologies）It is rapid in recent years
A kind of absorption spectrum detection technique to grow up.Its principle is being 99% or more by two reflectivity using pulse laser
Speculum group at decline and swing intracavitary roundtrip, declining, to swing in chamber be tested gas, is connect using the detector of the high speed of response outside chamber
Receive the light intensity changed over time.Measurement result disposes the influence of pulse laser fluctuation, has high sensitivity, signal-to-noise ratio, highly resistance dry
Disturb the advantages that ability is strong.
Invention content
In order to solve the problems in the existing technology the present invention, is provided and a kind of being combined LIBS technologies and CRDS technologies
, isotope can be distinguished and the enhanced laser induced breakdown spectrograph of LIBS imaging effects can be enhanced.
In order to achieve the above object, technical solution proposed by the present invention is：A kind of the enhanced of distinguishable carbon isotope swashs
Photoinduction breakdown spectrograph, including optical cavity, laser and detector are equipped in the optical cavity to decline and swing speculum and light focusing is anti-
Penetrate mirror, described decline swings speculum and be set to the both sides of optical cavity and be oppositely arranged, and light focusing speculum is located at the bottom of optical cavity, light
The one side wall of chamber is equipped with laser port, and the laser is located at laser port, and another side wall of optical cavity and top are respectively equipped with the first spy
Mouth and the second detection mouth are surveyed, the second detection mouth is oppositely arranged with light focusing speculum, is all provided at the first, second detection mouth
There is a detector.
It is handy to above-mentioned technical proposal to be further designed to：Convex lens is equipped at the laser port, laser transmitting swashs
Light enters optical cavity after convex lens.
Described decline swings speculum and light focusing speculum is concave mirror, and two are declined and swing speculum and light focusing reflection
Form light focusing room among mirror, described decline swings the concave surface of speculum and light focusing speculum and both face towards light focusing room.
It is described to decline that swing speculum be the high reflection eyeglass that reflectivity is 99% or more.
The optical cavity is equipped with air inlet.
Beneficial effects of the present invention are：
1, the device of the invention is focused by multiple reflections of the laser in optical cavity, and each laser focusing can puncture to be measured big
Gas sample product, therefore, each focus can obtain a LIBS signal, and multiple focuses can obtain multiple LIBS signals, exist in this way
In the detection of Atmospheric particulates, LIBS signal strengths can be improved.
2, since atmospheric sample has unstability, signal has fluctuation, and multiple focuses will produce in the technical program
Multiple LIBS signals can measure the average value of data, improve stability, while enhancing signal-to-noise ratio, reduce distortion.
3, due to the limitation of LIBS spectrum, isotope cannot be distinguished, to trace to source, understand the source of carbon.
LIBS spectrum and CRDS spectrum are combined by the technical program, can be with atmospheric sounding CO2Relevant CRDS spectrum are vibrated, are passed through
The absorption peak of spectrum distinguishes isotope12C and13C makes device have more practicability.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is multiple reflections schematic diagram of the laser in optical cavity.
Fig. 3 is optical cavity cohesion focus schematic diagram.
In above-mentioned attached drawing：1- optical cavities, 11- laser ports, 12- air inlets, 13- first detect mouth, and 14- second detects mouth, 2-
It declines and swings speculum, 3- light focusing speculums, 4- lasers, the first detectors of 5-, the second detectors of 6-, 7- convex lenses, 8- is poly-
Focus.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in detail.
Shown in the enhanced laser induced breakdown spectrograph structure chart 1 of the distinguishable carbon isotope of the present invention, including optical cavity
1, laser 4, the first detector 5 and the second detector 6, optical cavity 1 is interior to swing speculum 2 and light focusing speculum 3 equipped with declining, and declines
It swings there are two speculum 2 sets, is the high reflection eyeglass that reflectivity is 99% or more, be respectively arranged at the both sides of optical cavity 1 and opposite set
It sets, light focusing speculum 3 is located at the bottom of optical cavity 1, and two are declined to swing and form light among speculum 2 and light focusing speculum 3
Line focus room, it is concave mirror to decline and swing speculum 2 and light focusing speculum 3, and concave surface both faces towards light focusing room；Optical cavity 1
One side wall be equipped with laser port 11, another side wall be equipped with department first detection mouth 13, top be equipped with second detection mouth 14, laser port 11
Place is equipped with convex lens 7, and laser 2 is located at laser port, and the laser emitted enters optical cavity 1, the second detection after convex lens
Mouth 14 is oppositely arranged with light focusing speculum 3, and the detection of the first detector 5 and second is respectively equipped at the first, second detection mouth
Device 6.
Air inlet 12 is additionally provided on optical cavity 1, air inlet may be disposed at any position for not blocking light path on optical cavity wall.
Embodiment
How above-mentioned enhanced laser induced breakdown spectrograph is specifically to isotope resolution imaging, and the present embodiment is with titanium dioxide
Isotope in carbon12CO2With13CO2For illustrate, if experiment in detect in carbon dioxide13CO2The information of ion,
Distinguish isotope12CO2.Enter sample to be tested in optical cavity inside-pumping first, after it enters detection system, chooses proper pulse width
Laser is tested.Absorption band that there are two the infrared spectrums of carbon dioxide molecule, a corresponding antisymmetric stretching vibration, one
Corresponding deformation is vibrated,12CO2The wave number of antisymmetric stretching vibration is 2369cm-1, and deformation vibration wave number is 667cm-1,13CO2Instead
The wave number of symmetrical stretching vibration is 2283cm-1 .Therefore the present embodiment generates tunable laser using laser pump (ing) dyestuff, obtains
Output wavelength be 4380nm laser beam (13CO2The absorption band of infrared spectrum）, in the 4380nm laser that pulse laser generates
Under 1 focussing force of beam so that sample particle object present plasmoid, at the same time, laser through setting there are two reflection
Rate is the roundtrip in optical cavity after 99% or more decline and swing the optical cavity of speculum（As shown in Figure 2）, formed after multi-focusing more
A focus point 8 is received by 3 collecting signal of light focusing speculum by the second detector 6（As shown in Figure 3）.
The laser pump (ing) that retunes obtain output wavelength be 4220nm (12CO2The absorption band of infrared spectrum）Laser beam, together
Sample carries out the step of previous step, and the light intensity changed over time is then received using the first detector 5 of the high speed of response, and data pass
Enter data processing system, it can be with the sample Isotope Information measured by quick discrimination.
Laser roundtrip focussing force in optical cavity, repeatedly punctures the plasma that sample generates, and the second detector 6 is received
Collect obtained LIBS spectrum, it can be contained13CO2It is realized in the case of concentration is extremely low and element in particulate matter accurately determine
Property and quantitative analysis.And the attenuation process that the information collected by the first detector 5 is laser pulse, recording laser is in intracavitary
Ring-down time, distinguish isotope.
Technical scheme of the present invention is not limited to the various embodiments described above, all technical solutions obtained using equivalent replacement mode
It all falls in the scope of protection of present invention.
Claims (5)
1. a kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope, it is characterised in that：Including optical cavity, laser
And detector, it is equipped with to decline in the optical cavity and swings speculum and light focusing speculum, described decline swings speculum and be set to optical cavity
It both sides and is oppositely arranged, light focusing speculum is located at the bottom of optical cavity, and the one side wall of optical cavity is equipped with laser port, the laser
At laser port, another side wall of optical cavity and top are respectively equipped with the first detection mouth and the second detection mouth, the second detection mouth
It is oppositely arranged with light focusing speculum, a detector is equipped at the first, second detection mouth.
2. the enhanced laser induced breakdown spectrograph of distinguishable carbon isotope according to claim 1, it is characterised in that：Institute
It states and is equipped with convex lens at laser port, the laser of laser transmitting enters optical cavity after convex lens.
3. the enhanced laser induced breakdown spectrograph of distinguishable carbon isotope according to claim 2, it is characterised in that：Institute
It states to decline and swings speculum and light focusing speculum is concave mirror, two are declined to swing and formed among speculum and light focusing speculum
Light focusing room, described decline swing the concave surface of speculum and light focusing speculum and both face towards light focusing room.
4. the enhanced laser induced breakdown spectrograph of distinguishable carbon isotope according to claim 3, it is characterised in that：Institute
It states and declines that swing speculum be the high reflection eyeglass that reflectivity is 99% or more.
5. the enhanced laser induced breakdown spectrograph of distinguishable carbon isotope according to claim 4, it is characterised in that：Institute
It states optical cavity and is equipped with air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810437422.3A CN108398421A (en) | 2018-05-09 | 2018-05-09 | A kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope |
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| CN201810437422.3A CN108398421A (en) | 2018-05-09 | 2018-05-09 | A kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297952A (en) * | 2018-11-09 | 2019-02-01 | 南京信息工程大学 | Rice paper quality evaluation system based on laser induced breakdown spectroscopy |
| CN109459396A (en) * | 2018-12-04 | 2019-03-12 | 南京信息工程大学 | The online laser acquisition analyzer of Atmospheric particulates carbon isotope and its application method |
| CN110806385A (en) * | 2019-09-25 | 2020-02-18 | 中国计量科学研究院 | Cavity ring-down spectroscopy measurement device and system |
| CN111912833A (en) * | 2020-07-20 | 2020-11-10 | 苏州星帆华镭光电科技有限公司 | Enhancement mode laser-induced breakdown spectroscopy appearance of distinguishable carbon isotope |
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| CN110806385A (en) * | 2019-09-25 | 2020-02-18 | 中国计量科学研究院 | Cavity ring-down spectroscopy measurement device and system |
| CN111912833A (en) * | 2020-07-20 | 2020-11-10 | 苏州星帆华镭光电科技有限公司 | Enhancement mode laser-induced breakdown spectroscopy appearance of distinguishable carbon isotope |
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Application publication date: 20180814 |