CN208780590U - A kind of device of the chemical composition analysis for single suspended particulate - Google Patents
A kind of device of the chemical composition analysis for single suspended particulate Download PDFInfo
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- CN208780590U CN208780590U CN201821595635.0U CN201821595635U CN208780590U CN 208780590 U CN208780590 U CN 208780590U CN 201821595635 U CN201821595635 U CN 201821595635U CN 208780590 U CN208780590 U CN 208780590U
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- hollow beam
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- suspended particulate
- chemical composition
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Abstract
The utility model 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 the laser induced breakdown spectrograph that connect with the first coupled lens；The Raman spectrum acquisition system includes the second coupled lens and the Raman spectrometer that connect with the second coupled lens.The utility model simultaneously acquires atomic emission spectrum and Raman spectrum, realizes the in-situ study to the element composition and material composition of single suspended particulate by setting hollow beam generation device and spectra collection device, the sample particle of ionization hollow beam capture.
Description
Technical field
The utility model belongs to nonlinear optics application field, and in particular to it is a kind of for single suspended particulate chemistry at
The device 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) benefit
The plasma ablation that is generated with pulse laser simultaneously excites substance in sample, and by spectrometer acquisition by plasma exciatiaon
The atom spectrum that is emitted, the element constituent in sample is identified with this, so material can be identified, point
Class, 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 single particle in fluid (such as air)；
Laser capture technology based on photophoresis power is not yet organically combined with spectroscopic analysis system.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiency of the prior art, provide one kind to be used for
The device of the chemical composition analysis of single suspended particulate, the device are produced continuous wave laser by setting hollow beam generation device
Raw Gaussian beam is changed into hollow beam, captures to the sample particle in sample cell, while passing through setting pulse laser
Device ionizes the sample particle captured, realizes element composition and object to the single fine particulates to suspend in air
The online in-situ study of matter ingredient.
In order to solve the above technical problems, the technical solution adopted in the utility model is: a kind of for single suspended particulate
The device of chemical composition analysis, including pulse laser, it is characterised in that: further include hollow beam trapped particle system, atom
Emission spectrum acquisition 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 device of above-mentioned a kind of chemical composition analysis for single suspended particulate, it is characterised in that: the pulse swashs
The hollow beam that the pulsed light that light device generates is reflected perpendicular to high reflection mirror.
A kind of device of above-mentioned chemical composition analysis for single suspended particulate, it is characterised in that: the imaging system
System includes imaging device and microcobjective, and the microcobjective is arranged between the imaging device and the 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 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.
Compared with the prior art, the utility model has the following advantages:
1, the Gaussian beam that continuous wave laser generates is changed by the utility model by setting hollow beam generation device
Hollow beam captures the sample particle in sample cell, while by setting pulse laser, micro- to the sample captured
Grain is ionized, and realizes the online in-situ study to the single fine particulates element composition and material composition that suspend in air.
2, the utility model can get the atomic emissions light of ionized sample by setting spectra collection system and imaging device
Spectrum information, Raman spectral information and sample motion situation, realize the purpose of quantitative determination, are real-time online Pollution Study
Particulate matter provides a kind of new thinking.
3, the analytical equipment structure of the utility model is simple, and design is rationally, at low cost easy to spread.
Below by drawings and examples, the technical solution of the utility model is 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 utility model.
Fig. 2 is pulse laser, the sky of the device of the chemical composition analysis for single suspended particulate of the utility model
The positional diagram of heart beam-capturing particIe system, atomic emission spectrum acquisition system and imaging system.
Fig. 3 is the structural schematic diagram of the hollow beam generation device of the utility model.
Fig. 4 is the Raman spectrogram of the individual particle aluminium oxide measured using utility model device.
Fig. 5 is aluminium oxide standard Raman spectroscopy figure.
Fig. 6 is the laser induced breakdown spectroscopy figure of the individual particle aluminium oxide measured using utility model device.
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 utility model, including
Pulse laser 9 further includes 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.
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.
It is described from phase space beam modulation system (such as Fig. 3) 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；Further, it is also possible to pass through other
Beam-expanding collimation device be replaced, such as beam expander, collimator and other the optical system of laser bundle-enlarging collimation may be implemented
System.
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.
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.
Carrying out the chemical composition analysis of single suspended particulate using the device of the utility model, detailed process is as follows:
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 the individual particle aluminium oxide measured, peak position is respectively 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 the individual particle aluminium oxide measured, it is in wavelength
There is peak at 308.24nm and 309.31nm, it, can be true by being compared with the laser induced breakdown spectroscopy standard database of element in Fig. 7
It include aluminium element in fixed captured sample.
The above is only the preferred embodiment of the utility model, not imposes any restrictions to the utility model, all
According to any simple modification to the above embodiments of the utility model technical spirit, change and equivalent structural changes, still
Belong in the protection scope of technical solutions of the utility model.
Claims (10)
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).
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 hollow beam that the pulsed light that the pulse laser (9) generates is reflected perpendicular to high reflection mirror (5).
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 imaging system includes imaging device (11) and microcobjective (10), and the microcobjective (10) is arranged in the imaging device
(11) between the sample cell (7).
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:
The continuous wave laser (1) is 532nm continuous conductor laser or all solid state tunable Ti:Sapphire laser dyestuff continuous wave laser.
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 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.
6. a kind of device of the chemical composition analysis for single suspended particulate according to claim 5, it is characterised in that:
Described from phase space beam modulation system includes that the first convex lens (2-1) being set in same optical path and non-linear absorption are situated between
Matter (2-2).
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:
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).
8. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 3, it is characterised in that:
The imaging device (11) includes CCD camera, ICCD camera or CMOS camera.
9. 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).
10. a kind of device of chemical composition analysis for single suspended particulate described in accordance with the claim 3, feature exist
In: the imaging device (11), laser induced breakdown spectrograph (14) and the Raman spectrometer (17) are located at sample cell
(7) different side.
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| CN201821595635.0U CN208780590U (en) | 2018-09-29 | 2018-09-29 | A kind of device of the chemical composition analysis for single suspended particulate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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