CN109211847A - A kind of device and method of the chemical composition analysis for single suspended particulate - Google Patents
A kind of device and method of the chemical composition analysis for single suspended particulate Download PDFInfo
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- CN109211847A CN109211847A CN201811156273.XA CN201811156273A CN109211847A CN 109211847 A CN109211847 A CN 109211847A CN 201811156273 A CN201811156273 A CN 201811156273A CN 109211847 A CN109211847 A CN 109211847A
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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
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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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
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
Abstract
The invention discloses a kind of devices of chemical composition analysis for single suspended particulate, including pulse laser, further include hollow beam trapped particle system, atomic emission spectrum acquisition system, Raman spectrum acquisition system and imaging system；Hollow beam trapped particle system includes continuous wave laser, hollow beam generation device, beam-expanding collimation device, high reflection mirror, the first convergent lens and sample cell, is provided with sample particle in sample cell；Atomic emission spectrum acquisition system includes the first coupled lens and laser induced breakdown spectrograph；Raman spectrum acquisition system includes the second coupled lens and Raman spectrometer.In addition, the present invention also provides the methods for the chemical component for analyzing single suspended particulate using above-mentioned apparatus.The present invention captures sample particle with hollow beam and ionizes the sample particle with pulse laser, acquires the atomic emission spectrum information and Raman spectral information of sample particle, realizes the in-situ study to the element composition and material composition of single suspended particulate.
Description
Technical field
The invention belongs to nonlinear optics application fields, and in particular to a kind of chemical component for single suspended particulate point
The device and method of analysis.
Background technique
Have at present for the detection method of particulate in air: infrared absorption spectroscopy, ultraviolet absorption spectroscopy, ultraviolet glimmering
Light method, chemoluminescence method, nephelometry and scattering method etc., however these methods can not be to fine particulates in air (aerosol, charcoal
Black, trace heavy metal etc.) ingredient and structure detected.Laser induced breakdown spectroscopy is as a kind of emerging survey in situ
Amount technology, both can analyze solid sample, can also analyze liquid and gaseous sample, have quickly, in real time, can be distant
It surveys, without pre-processing and analysis while can realize multielement, has been used successfully to material at present, metallurgy, burning, environment, has examined
The numerous areas such as Gu, space exploration, medicine and military affairs.
Laser induced breakdown spectrograph (Laser-Induced Breakdown Spectroscopy, abbreviation LIBS) utilizes
Plasma ablation that pulse laser generates simultaneously excites substance in sample, and by spectrometer acquisition by plasma exciatiaon
The spectrum that atom is emitted identifies the element constituent in sample with this, and then material can be identified, be classified,
Qualitative and quantitative analysis.Laser-induced breakdown Raman spectrum (Laser-induced breakdown Raman
Spectroscopy, LIBRAS) technology is the atom spectrum for obtaining substance simultaneously in same loci by LIBS and Raman spectrum
With the in situ measurement spectral technique of molecular spectrum, by by the data dissection process of the two, can be completed at the same time atom spectrum and point
The micro-zone in situ measurement of sub-light spectrum, so that the element and molecular composition to sample carry out fast quantitative analysis and identification.But just
The report being currently known, LIBS is only limitted to carry out online in situ detection to the sample particle being attached on some solids, for stream
The detection of the particle to suspend in body such as air or liquid still can not carry out, and since LIBS system can puncture object,
Solid accompanying by sample particle inevitably makes spectrometer generate noise, to influence the accurate analysis of particle components.
In optical field, hollow beam refers to that lateral amplitude of vibration distribution meets the light beam of high-order Bessel function, transverse direction
It is a series of dark concentric loops that light distribution, which shows as a center,.According to photophoresis power principle, hollow beam can be by light absorptive
Particle capture is to be currently known most stable of dress using the light absorptive particle in hollow beam capture air in its dark region
It sets, while can realize the three-dimensional manipulating of particle by the size or power for adjusting hollow beam.The unique light of hollow beam
Strong distribution makes it have important application value in the fields such as particle manipulation and nonlinear optics.
Currently, can be realized the real-time in-situ analysis method of particle constituent in air, there is not been reported, main former
Because having two: the detection method being currently known can not analyze the chemical component of particulate matter in fluid (such as air)；It is based on
The laser capture technology of photophoresis power is not yet organically combined with spectroscopic analysis system.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of for single
The analytical equipment and method of the chemical composition analysis of suspended particulate, the device and method will by setting hollow beam generation device
The Gaussian beam that continuous wave laser generates is changed into hollow beam, captures to the sample particle in sample cell, passes through simultaneously
Pulse laser is set, the sample particle captured is ionized, is realized to the single fine particulates to suspend in air
The in-situ study of element composition and material composition.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of chemistry for single suspended particulate
The device of constituent analysis, including pulse laser, it is characterised in that: further include hollow beam trapped particle system, atomic emissions
Spectra collection system, Raman spectrum acquisition system and imaging system；
The hollow beam trapped particle system include continuous wave laser, hollow beam generation device, beam-expanding collimation device,
High reflection mirror, the first convergent lens and the sample cell in changeable hollow beam direction；The continuous wave laser, hollow beam generate
Device, beam-expanding collimation device, high reflection mirror and the first convergent lens are set in turn in same optical path, setting in the sample cell
There is sample particle；
The atomic emission spectrum acquisition system includes the first coupled lens and the laser that connect with the first coupled lens
Induced breakdown spectrograph is provided between first coupled lens and laser induced breakdown spectrograph and couples for connecting first
First optical fiber of lens and laser induced breakdown spectrograph；
The Raman spectrum acquisition system includes the second coupled lens and the Raman spectrum that connect with the second coupled lens
Instrument is provided with for connecting the second coupled lens and Raman spectrometer between second coupled lens and Raman spectrometer
Two optical fiber；
The hollow beam that the pulsed light that the pulse laser generates is reflected perpendicular to high reflection mirror；
The imaging system includes imaging device and microcobjective, and the microcobjective is arranged in the imaging device and institute
It states between sample cell.
The device of above-mentioned a kind of chemical composition analysis for single suspended particulate, it is characterised in that: described continuous sharp
Light device is 532nm continuous conductor laser or all solid state tunable Ti:Sapphire laser dyestuff continuous wave laser.
A kind of device of above-mentioned chemical composition analysis for single suspended particulate, it is characterised in that: the hollow light
Beam generation device includes that can produce modulating from phase space beam modulation system, cross-phase spatial beam for hollow beam to be
System, bipyramid lens, spatial light modulator or phase-plate.
The device of above-mentioned a kind of chemical composition analysis for single suspended particulate, it is characterised in that: described from phase
Spatial beam modulating system includes the first convex lens and non-linear absorption medium being successively set in same optical path.
The device of above-mentioned a kind of chemical composition analysis for single suspended particulate, it is characterised in that: described to expand standard
Straight device includes the second convergent lens and third convergent lens in same optical path, and second convergent lens is located at described
Between hollow beam generation device and third convergent lens.
A kind of device of above-mentioned chemical composition analysis for single suspended particulate, it is characterised in that: the imaging dress
It sets including CCD camera, ICCD camera or CMOS camera.
A kind of device of above-mentioned chemical composition analysis for single suspended particulate, it is characterised in that: first meeting
Poly- lens are between the high reflection mirror and the sample cell.
A kind of device of above-mentioned chemical composition analysis for single suspended particulate, it is characterised in that: the imaging dress
It sets, laser induced breakdown spectrograph and the Raman spectrometer side that be located at sample cell different.
In addition, the present invention also provides a kind of sides of chemical composition analysis for carrying out single suspended particulate using above-mentioned apparatus
Method, which comprises the following steps:
Step 1: the continuous laser beam of a branch of Gaussian Profile is obtained from continuous wave laser, by continuous laser beam obtained
A branch of hollow beam is shaped to by hollow beam generation device；
Step 2: the obtained hollow beam of step 1 is adjusted by being incident on high reflection mirror after beam-expanding collimation device
High reflection mirror makes the hollow beam of reflection be incident on the first convergent lens and forms the hollow beam assembled, the hollow beam of convergence
It is incident in sample cell；
Step 3: obtaining the pulsed light of a branch of convergence from pulse laser and making convergence center and the imaging of the pulsed light
The imaging center of device is overlapped, and closes pulse laser；
Step 4: spraying into sample particle into sample cell, the hollow beam capture sample for being incident on the convergence of sample cell is micro-
For grain in ligh trap position, the light intensity and size for adjusting hollow beam are overlapped ligh trap position with the imaging center of imaging device；
Step 5: the scattering light that the second coupled lens acquisition sample particle generates, Raman spectrometer show Raman spectrum letter
Breath；
Make the pulsed light assembled by the sample corpuscular ionization of capture Step 6: opening pulse laser, closes pulse laser
Device；
Step 7: the atomic emission spectrum that the first coupled lens acquisition sample corpuscular ionization generates, laser-induced breakdown light
Spectrometer shows the information of atomic emission spectrum.
Compared with the prior art, the present invention has the following advantages:
1, the Gaussian beam that continuous wave laser generates is changed into hollow by the present invention by setting hollow beam generation device
Light beam captures the sample particle in sample cell, at the same by setting pulse laser, to the sample particle captured into
The online in-situ study to the element composition and material composition of the single fine particulates to suspend in air is realized in row ionization.
2, the present invention can get the atomic emission spectrum letter of ionized sample by setting spectra collection system and imaging device
Breath, Raman spectral information and sample motion situation, realize the purpose of quantitative determination, are real-time online Pollution Study particle
Object provides a kind of new thinking.
3, analytical equipment structure of the invention is simple, and design is rationally, at low cost easy to spread.
4, analysis method of the invention is easily operated, can the continually changing suspended particulate of catch position, and to suspended particulate
Spectrum resolution is carried out, realizes the on-line checking of single suspended matter.
With reference to the accompanying drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the device of the chemical composition analysis for single suspended particulate of the invention.
Fig. 2 is pulse laser, the hollow light of the device of the chemical composition analysis for single suspended particulate of the invention
Beam trapped particle system, the positional diagram of atomic emission spectrum acquisition system and imaging system.
Fig. 3 is the structural schematic diagram of hollow beam generation device of the invention.
Fig. 4 is the Raman spectrogram of individual particle aluminium oxide measured by the present invention.
Fig. 5 is aluminium oxide standard Raman spectroscopy figure.
Fig. 6 is the laser induced breakdown spectroscopy figure of individual particle aluminium oxide measured by the present invention.
Fig. 7 is aluminium element standard laser induced breakdown spectroscopy figure.
Description of symbols:
1-continuous wave laser；2-hollow beam generation devices；The first convex lens of 2-1-；
2-2-non-linear absorption medium；3-the second convergent lens；4-third convergent lenses；
5-high reflection mirrors；6-the first convergent lens；7-sample cells；
8-sample particles；9-pulse lasers；10-microcobjectives；
11-imaging devices；12-the first coupled lens；13-the first optical fiber；
14-laser induced breakdown spectrographs；15-the second coupled lens；16-the second optical fiber；
17-Raman spectrometers.
Specific embodiment
Embodiment 1
As depicted in figs. 1 and 2, the device of the chemical composition analysis for single suspended particulate of the present embodiment, including arteries and veins
Rush laser 9, further include hollow beam trapped particle system, atomic emission spectrum acquisition system, Raman spectrum acquisition system and
Imaging system；
The hollow beam trapped particle system includes continuous wave laser 1, hollow beam generation device 2, beam-expanding collimation dress
It sets, high reflection mirror 5, the first convergent lens 6 and the sample cell 7 in changeable hollow beam direction；It is the continuous wave laser 1, hollow
Beam generated device 2, beam-expanding collimation device, high reflection mirror 5 and the first convergent lens 6 are set in turn in same optical path, described
Sample particle 8 is provided in sample cell 7；
The atomic emission spectrum acquisition system includes the first coupled lens 12 and connect with the first coupled lens 12
Laser induced breakdown spectrograph 14 is provided between first coupled lens 12 and laser induced breakdown spectrograph 14 for connecting
Connect the first optical fiber 13 of the first coupled lens 12 and laser induced breakdown spectrograph 14；
The Raman spectrum acquisition system includes the second coupled lens 15 and the Raman that connect with the second coupled lens 15
Spectrometer 17 is provided with for connecting the second coupled lens 15 and drawing between second coupled lens 15 and Raman spectrometer 17
Second optical fiber 16 of graceful spectrometer 17；
The hollow beam that the pulsed light that the pulse laser 9 generates is reflected perpendicular to high reflection mirror 5；The pulse laser
9 are placed perpendicular to the direction of propagation of hollow beam of the reflection of high reflection mirror 5 and in the same plane with sample cell 7；
The imaging system includes imaging device 11 and microcobjective 10, and the setting of microcobjective 10 is filled in the imaging
It sets between 11 and the sample cell 7；In the present embodiment, microcobjective 10 be amplification factor be 10 ×, N.A. be 0.25 it is micro-
Object lens.
The continuous wave laser 1 is 532nm continuous conductor laser, it is also possible to which all solid state tunable Ti:Sapphire laser dyestuff connects
Continuous laser substitution.
The hollow beam generation device 2 include can produce hollow beam from phase space beam modulation system, hand over
Pitch phase space beam modulation system, bipyramid lens, spatial light modulator or phase-plate.
Such as Fig. 3, it is described from phase space beam modulation system include the first convex lens being successively set in same optical path
2-1 and non-linear absorption medium 2-2, and can be used to detect the CCD camera of the hollow beam, which receives by non-
The light beam of linear absorption medium 2-2, and be movably arranged in the optical path.
Further, it is also possible to using cross-phase spatial beam modulating system, the cross-phase spatial beam modulating system
For application No. is " 2016109453059 ", patent name is a kind of " acquisition side of the bessel beam based on Cross-phase Modulation
The device of bessel beam is obtained disclosed in the patent of invention of method and device ", the outgoing wave that laser is arranged is a length of
780.2100nm obtaining hollow beam；
Additionally hollow beam can be obtained by bipyramid lens, spatial light modulator or phase-plate.
The beam-expanding collimation device includes the second convergent lens 3 and third convergent lens 4 in same optical path, described
Second convergent lens 3 is between the hollow beam generation device 2 and third convergent lens 4；In the present embodiment, second is assembled
The focal length of lens 3 is 100mm, and the focal length of third convergent lens 4 is 200mm；Further, it is also possible to pass through other beam-expanding collimation dresses
Set and be replaced, for example, beam expander, collimator and other the optical system of laser bundle-enlarging collimation may be implemented.
The imaging device 11 includes CCD camera, ICCD camera or CMOS camera；Imaging device in the present embodiment is
CCD camera, it is also possible to ICCD camera or the replacement of CMOS camera.
First convergent lens 6 is between the high reflection mirror 5 and the sample cell 7, in the present embodiment, the first meeting
The focal length of poly- lens 6 is 30mm, additionally can be 10 with amplification factor ×, the replacement such as microcobjective that N.A. is 0.25.
The imaging device 11, laser induced breakdown spectrograph 14 and the Raman spectrometer 17 are located at sample cell 7
Different sides；In the present embodiment, imaging device 11, laser induced breakdown spectrograph 14, pulse laser 9, sample cell 7 and
Raman spectrometer 17 is in same plane, the hollow beam which reflects perpendicular to high reflection mirror 5.
Embodiment 2
The method that the chemical composition analysis of single suspended particulate is carried out using the device of embodiment 1, specific steps include:
Step 1: the continuous laser beam of a branch of Gaussian Profile is obtained from continuous wave laser 1, by continuous laser beam obtained
A branch of hollow beam is shaped to by hollow beam generation device 2；Hollow beam is generated with from phase space beam modulation system,
The continuous laser beam of the Gaussian Profile obtained from continuous wave laser 1 first passes through the first convex lens 2-1 and focuses on non-linear absorption Jie
It can produce hollow beam in matter 2-2, which is detected by CCD camera；Non-linear absorption medium 2-2 is rubidium atom pond,
It can also be substituted with lead glass or sodium atom pond；
Step 2: the obtained hollow beam of step 1 is adjusted by being incident on high reflection mirror 5 after beam-expanding collimation device
High reflection mirror 5 makes the hollow beam of reflection be incident on the first convergent lens 6 and forms the hollow beam assembled, the hollow light of convergence
Beam is incident in sample cell 7；The process of beam-expanding collimation is that the obtained hollow beam of step 1 is first passed through the second convergent lens
3 carry out beam-expanding collimation by third convergent lens 4 again；
Step 3: obtaining the pulsed light of a branch of convergence from pulse laser 9, adjusting pulse laser 9 makes the meeting of pulsed light
Poly- center is overlapped with the imaging center of imaging device 11, closes pulse laser 9；
Step 4: spraying into sample particle 8 into sample cell 7, it is incident on the hollow beam capture sample of the convergence of sample cell 7
For particle 8 in ligh trap position, the light intensity and size for adjusting hollow beam are overlapped ligh trap position and the imaging center of imaging device 11；
Sample used particle 8 is aluminium oxide in the present embodiment, and particle size is 2~10 μm, it is also possible to the replacement of other light-absorbing compounds；
In the present embodiment using from phase space beam modulation system generate hollow beam, by adjust continuous wave laser 1 power come
The light intensity for adjusting the hollow beam obtained changes the size of hollow beam by changing the focal length of the first convex lens 2-1, makes to obtain
The ligh trap position of the hollow beam capture sample particle 8 obtained is overlapped with imaging center shown by imaging device 11；
Hollow beam is generated by cross-phase spatial beam modulating system, the angle of rotation half wave plate can be passed through
It spends to change the light intensity and size of hollow beam；
Hollow beam is obtained by bipyramid lens, sky can be changed by setting half wave plate and polarization splitting prism
The light intensity of heart light beam；Change the size of hollow beam by changing the corner angle of bipyramid lens；
Hollow beam is obtained by spatial light modulator or phase-plate, the output of adjusting spatial light modulator can be passed through
Electric current adjusts the phase information of phase-plate to change the light intensity and size of hollow beam；
Imaging system is adjusted, amplifies the motion conditions of sample particle 8 through microcobjective 10 and imaging device 11 is recorded
On；Imaging is shot with CCD camera, it is also possible to ICCD camera or the replacement of CMOS camera；
Step 5: adjusting the position of the second coupled lens 15, generate the second coupled lens 15 acquisition sample particle 8 scattered
Light is penetrated, the Raman spectrometer 17 connecting with the second coupled lens 15 shows Raman spectral information；
The pulsed light assembled is ionized by the sample particle 8 of capture Step 6: opening pulse laser 9, is closed pulse and is swashed
Light device 9；
Step 7: adjusting the position of the first coupled lens 12, generate the acquisition ionization of sample particle 8 of the first coupled lens 12
Atomic emission spectrum, the laser induced breakdown spectrograph 14 that connect with the first coupled lens 12 shows the letter of atomic emission spectrum
Breath.
It sprays into sample particle again into sample cell 7 to carry out repeating detection, the spectrogram repeatedly obtained is compared, it will be true
Fixed spectrogram is compared with standard spectrogram.
Above-mentioned steps, which can according to need, to be adjusted.
According to Fig. 4 and Fig. 5, in the Raman spectrogram (Fig. 4) of individual particle aluminium oxide measured by the present invention, peak position difference
For 378cm-1、578-1And 645-1, shown 376.9cm in corresponding aluminium oxide standard Raman spectroscopy (Fig. 5)-1、575.9cm-1And 643.9cm-1, can determine whether to show that captured sample particle includes alumina species accordingly.
According to Fig. 6 and Fig. 7, in the laser induced breakdown spectroscopy figure (Fig. 6) of individual particle aluminium oxide measured by the present invention,
Wavelength is to have peak at 308.24nm and 309.31nm, passes through the laser induced breakdown spectroscopy standard database with element in figure (7)
It compares, it may be determined that include aluminium element in the sample captured.
The principle of analysis method of the invention are as follows:
The present invention is based on the basic principles of photophoresis power optical tweezer.Specifically: when light beam is radiated at light absorptive microparticle surfaces
Microparticle surfaces irradiated area temperature can be caused to increase, irradiated area temperature increases the heat motion of gas molecules of rear surface attachment
Aggravation, gas molecule bounce off microparticle surfaces, molecule of the plane of illumination heat motion of gas molecules than non-plane of illumination with bigger speed
Acutely, particle generates the net effort that non-plane of illumination is directed toward by shadow surface under comprehensive function.According to aerodynamics original
Reason, molecular action can be indicated in the pressure F of microparticle surfaces are as follows:
Wherein, ρaFor the density of air, kg/m3；B is pervasive air constant, J/ (molK)；T is particle surface temperature,
K；M is the molal weight of air molecule, kg/mol.
For hollow beam, the power acted on microparticle surfaces can be indicated are as follows:
Wherein, ρaFor the density of air, kg/m3；B is pervasive air constant, J/ (molK)；T is particle surface temperature,
K；M is the molal weight of air molecule, kg/mol；S is the area of particle glazing irradiation area, m2。
For irregular particle:
Wherein,For the average speed of air molecule, m/s；γ=cp/cvFor specific heat ratio；PlFor the function of incident hollow beam
Rate, W；P is pressure of ambient gas, N/m2；P* is characterized pressure, N/m2；α is the thermal accommodation coefficient of microparticle surfaces, Δ α=α1-
α2,
In gravity, FΔTAnd FΔαUnder the action of, particle can be captured in focus area, and can be by adjusting hollow light
The size of beam changes FΔTThe size of power, and then particle is manipulated.
Captured particle is ionized by the pulsed light that pulse laser generates, by LIBS technology and Raman spectrum to electricity
The spectrum of power particle is analyzed, while obtaining the material composition information and element information of particle.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (9)
1. a kind of device of the chemical composition analysis for single suspended particulate, including pulse laser (9), it is characterised in that:
It further include hollow beam trapped particle system, atomic emission spectrum acquisition system, Raman spectrum acquisition system and imaging system；
The hollow beam trapped particle system includes continuous wave laser (1), hollow beam generation device (2), beam-expanding collimation dress
It sets, high reflection mirror (5), the first convergent lens (6) and the sample cell (7) in changeable hollow beam direction；The continuous wave laser
(1), hollow beam generation device (2), beam-expanding collimation device, high reflection mirror (5) and the first convergent lens (6) are set in turn in together
In one optical path, sample particle (8) are provided in the sample cell (7)；
The atomic emission spectrum acquisition system includes the first coupled lens (12) and connect with the first coupled lens (12)
Laser induced breakdown spectrograph (14) is provided between first coupled lens (12) and laser induced breakdown spectrograph (14)
For connecting the first optical fiber (13) of the first coupled lens (12) and laser induced breakdown spectrograph (14)；
The Raman spectrum acquisition system includes the second coupled lens (15) and the Raman connecting with the second coupled lens (15)
Spectrometer (17) is provided with for connecting the second coupled lens between second coupled lens (15) and Raman spectrometer (17)
(15) and the second optical fiber (16) of Raman spectrometer (17)；
The hollow beam that the pulsed light that the pulse laser (9) generates is reflected perpendicular to high reflection mirror (5)；
The imaging system includes imaging device (11) and microcobjective (10), and the microcobjective (10) is arranged in the imaging
Between device (11) and the sample cell (7).
2. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
The continuous wave laser (1) is 532nm continuous conductor laser or all solid state tunable Ti:Sapphire laser dyestuff continuous wave laser.
3. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
The hollow beam generation device (2) include can produce hollow beam from phase space beam modulation system, cross-phase
Spatial beam modulating system, bipyramid lens, spatial light modulator or phase-plate.
4. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
It is described from phase space beam modulation system include the first convex lens (2-1) being successively set in same optical path and non-linear suction
It receives medium (2-2).
5. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
The beam-expanding collimation device includes the second convergent lens (3) and third convergent lens (4) in the same optical path, and described second
Convergent lens (3) is between the hollow beam generation device (2) and third convergent lens (4).
6. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
The imaging device (11) includes CCD camera, ICCD camera or CMOS camera.
7. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
First convergent lens (6) is between the high reflection mirror (5) and the sample cell (7).
8. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 1, it is characterised in that:
The imaging device (11), laser induced breakdown spectrograph (14) and the Raman spectrometer (17) are located at sample cell (7)
Different sides.
9. a kind of method for the chemical composition analysis for carrying out single suspended particulate using device as described in claim 1, special
Sign is, comprising the following steps:
Step 1: obtaining the continuous laser beam of a branch of Gaussian Profile from continuous wave laser (1), continuous laser beam obtained is led to
It crosses hollow beam generation device (2) and is shaped to a branch of hollow beam；
Step 2: adjustment is high by the obtained hollow beam of step 1 by being incident on high reflection mirror (5) after beam-expanding collimation device
Reflecting mirror (5), make reflection hollow beam be incident on the first convergent lens (6) formed assemble hollow beam, convergence it is hollow
Light beam is incident in sample cell (7)；
Step 3: obtaining the pulsed light of a branch of convergence from pulse laser (9) and making convergence center and the imaging of the pulsed light
The imaging center of device (11) is overlapped, and is closed pulse laser (9)；
Step 4: spraying into sample particle (8) into sample cell (7), it is incident on the hollow beam capture sample of the convergence of sample cell (7)
In ligh trap position, the light intensity and size for adjusting hollow beam make in the imaging of ligh trap position and imaging device (11) product particle (8)
The heart is overlapped；
Step 5: the scattering light that the second coupled lens (15) acquisition sample particle (8) generates, Raman spectrometer (17) shows Raman
Spectral information；
The pulsed light assembled is ionized by the sample particle (8) of capture Step 6: opening pulse laser (9), is closed pulse and is swashed
Light device (9)；
Step 7: the atomic emission spectrum that the first coupled lens (12) acquisition sample particle (8) ionization generates, laser-induced breakdown
Spectrometer (14) shows the information of atomic emission spectrum.
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| CN111077060A (en) * | 2019-12-31 | 2020-04-28 | 天津大学 | Single particle detection system based on Raman and laser-induced breakdown spectroscopy integration |
| CN111366510A (en) * | 2020-03-02 | 2020-07-03 | 清华大学深圳国际研究生院 | Suspended particulate matter flux measuring device utilizing synchronous polarization and fluorescence |
| CN111855505A (en) * | 2020-07-07 | 2020-10-30 | 浙江大学 | Microsphere cluster state detection device and detection method applied to vacuum optical trap system |
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