CN110044875A - A kind of aerosol detection sighting device for laser induced breakdown spectroscopy - Google Patents
A kind of aerosol detection sighting device for laser induced breakdown spectroscopy Download PDFInfo
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- CN110044875A CN110044875A CN201910344042.XA CN201910344042A CN110044875A CN 110044875 A CN110044875 A CN 110044875A CN 201910344042 A CN201910344042 A CN 201910344042A CN 110044875 A CN110044875 A CN 110044875A
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- aerosol
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- 239000000443 aerosol Substances 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 title claims abstract description 17
- 230000005284 excitation Effects 0.000 claims abstract description 20
- 230000003595 spectral effect Effects 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 238000004611 spectroscopical analysis Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 11
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 230000035807 sensation Effects 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000001246 colloidal dispersion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- 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
- G01N21/62—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
Abstract
The present invention relates to aerosol detection fields, more particularly to a kind of aerosol for laser induced breakdown spectroscopy detects sighting device, the device includes: Laser Aiming Module, for two groups of right-angled intersection of scattering laser device and photomultiplier tube, the laser that scattering laser device generates after aerosol pipe by photomultiplier tube by being received, and the optical path crosspoint of the laser of generation is as checkpoint；Laser excitation module, the optical path crosspoint for focusing on two groups of scattering laser device transmitting laser in Laser Aiming Module make aerosol generate plasma；Spectral signal receiving module, the spectroscopic data for the plasma that detection aerosol generates.Solve the problems, such as that can high energy laser be correctly focused on particulate, the spectroscopic data intensity made is sufficiently large, is able to carry out the processing such as elemental recognition.
Description
Technical field
The present invention relates to aerosol detection field more particularly to a kind of aerosols for laser induced breakdown spectroscopy
Detect sighting device.
Background technique
Aerosol is to be dispersed by solid or liquid fine particle and be suspended in the colloidal dispersion system formed in gas medium,
Size is 0.001~100 μm.Aerosol is divided into cigarette, mist and dust, can generate naturally or be artificially formed.It can be floated with air
Far distance is moved to, atmosphere pollution is caused, tremendous influence is caused to the living environment of the mankind.
LIBS (Laser Induced Breakdown Spectroscopy), i.e. laser induced breakdown spectroscopy are
Sample surfaces are focused by ultra-short pulse laser and form plasma, and then plasma emission spectrum is analyzed with determination
The material composition and content of sample.Ultra-short pulse laser focus after energy density it is higher, can by any states of matter (solid-state, liquid,
Gaseous state) sample excitation form plasma, therefore can be used for the detection of aerosol.The advantage of the technology are as follows: can be polynary
Element is analyzed simultaneously, and sample pretreatment is simple, and detection rates are fast, there is less sample loss, high sensitivity.
Since the core of LIBS technology is that high energy laser focuses on sample surfaces progress ablation, how successfully to make
It is particularly critical that high energy laser is correctly focused on sample surfaces.When carrying out aerosol detection using LIBS technology, this point is more
It is prominent.It shows, aerosol small volume, in vaporous, is visually difficult to confirm whether laser accurately focuses.Also, due to LIBS
Technology is less reproducible, has very strong matrix effect, in LIBS experiment, to laser light incident direction and spectroscopic acquisition side
To control it is particularly critical, laser light incident direction and the available multiple groups sample data in spectroscopic acquisition direction are adjusted, in number
When according to processing, increase the accuracy of arithmetic result.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of aerosol for laser induced breakdown spectroscopy
Sighting device is detected, solves the problems, such as that can high energy laser be correctly focused on particulate, the spectroscopic data made is strong
Spend it is sufficiently large, be able to carry out elemental recognition etc. processing.
The invention is realized in this way
A kind of aerosol detection sighting device for laser induced breakdown spectroscopy, the device include:
Laser Aiming Module generates for two groups of right-angled intersection of scattering laser device and photomultiplier tube, scattering laser device
Laser after aerosol pipe by photomultiplier tube by being received, and the optical path crosspoint of the laser of generation is as checkpoint；
Laser excitation module, the optical path crosspoint for focusing on two groups of scattering laser device transmitting laser in Laser Aiming Module make
It obtains aerosol and generates plasma；
Spectral signal receiving module, the spectroscopic data for the plasma that detection aerosol generates.
Further, the laser excitation module is rotated around crosspoint, and the spectral signal receiving module is around intersection
Point rotation.
Further, the aerosol pipe is placed in transparent interior pony axle, and the both ends of the shaft passes through rotation axis respectively
It holds and is connected with the first rotating base and the second rotating base, the laser excitation module is placed in the first rotating base, the spectrum
Signal receiving module is placed in the second rotating base, is realized by the first rotating base and the second rotating base around the rotation of shaft
The excitation and detection of different directions.
Further, it is respectively arranged with a rotating bar on first rotating base and the second rotating base, by described
Rotating bar drives the first rotating base and the second rotating base to rotate around shaft.
Further, the middle layer between the first rotating base and the second rotating base is arranged in the Laser Aiming Module
In, the middle layer is fixed in the shaft.
Further, the shaft connects a locating module, is realized and is moved by locating module, changes the position of checkpoint
It sets.
Further, the locating module includes two vertical the first conveyer belts and the second transmission belt, passes through electricity respectively
Machine drives, and a deck is arranged on each conveyer belt, a strut is threadedly coupled on each deck, is fixed on by the other end of strut
It is to be able to drive the movement of branch rod adaptive screw thread in deck movement, realization can carry out in the horizontal direction in test point in shaft
The scanning of two axis.
Compared with prior art, the present invention beneficial effect is: the present invention is using laser induced breakdown spectroscopy to gas
Colloidal sol is detected, and there is multielement to identify, without the advantage of sample pretreatment simultaneously.And make arteries and veins using two-dimensional structure design
Impulse light accurately focuses on aerosol, significantly increases the hit rate and hit efficiency of pulse laser.It simultaneously can also be from
Sample does not have to orientation and is excited, and carries out spectrum data gathering from plasma different direction, greatly reduces LIBS technology
Repeated poorly problem increases detection ground accuracy.
Detailed description of the invention
General structure schematic diagram of the invention when Fig. 1；
Fig. 2 is the structural schematic diagram of the Laser Aiming Module in Fig. 1；
Fig. 3 is the structural schematic diagram of the laser excitation module in Fig. 1；
Fig. 4 is the structural schematic diagram of the spectrum receiving module in Fig. 1；
Fig. 5 is the structural schematic diagram of the locating module in Fig. 1；
Wherein, figure label are as follows: 1, laser excitation module, 2, Laser Aiming Module, 3, spectral signal receiving module, 4, fixed
Position module, 5, pulse laser, A is shaft, the 6, first rotating base, 7, scattering laser device group, 8, photomultiplier tube group, 9, light
Spectrometer CCD, the 10, second rotating base, 11, aerosol pipe, 12, test point, the 13, first scattering laser device, the 14, second scattering swash
Light device, the 15, first photomultiplier tube, the 16, second photomultiplier tube, the 17, first rotating bar, the 18, second rotating bar, 19, first
Motor, the 20, second motor, the 21, first conveyer belt, the 22, second conveyer belt, the 23, first deck, the 24, second deck, 25, first
Strut, the 26, second strut.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
As shown in Figure 1, a kind of aerosol for laser induced breakdown spectroscopy detects sighting device, taken aim at comprising laser
Quasi-mode block 2, laser excitation module 1, spectral signal receiving module 3 and locating module 4.
Laser Aiming Module, laser excitation module and spectral signal receiving module, distinguish from top to bottom on spatial position
It is arranged on a shaft A, is all coaxial circular ring structure, laser excitation module 1 and spectral signal receiving module 3 can be around axis
Rotation.
Shaft A is connect with locating module 4, can realize that shaft drives laser aiming mould by the control to locating module 4
Block, laser excitation module and spectral signal receiving module two axle movement in the horizontal direction, enable test point in the horizontal direction
Carry out two axis scannings.
The Laser Aiming Module 2, laser excitation module 1 and spectral signal receiving module 3 through a diameter be 150~
The shaft A connection of 200mm, one is divided into three layers in shaft, and first layer is laser excitation module, and the second layer is laser aiming mould
Block, third layer are spectral signal receiving module.The second layer is fixing layer, and the first third layer can be revolved via rotating base
Turn.Every layer of thickness is determined by the volume for the detection device installed on axis.Shaft is transparent material or is between each layer there branch
Frame structure.Gas hose is built in shaft.
As shown in Fig. 2, being Laser Aiming Module schematic diagram, detection is constituted by scattering laser device group 7 and photomultiplier tube group 8
Device, totally two groups, including the first scattering laser device 13 is corresponding with the first photomultiplier tube 15, the second scattering laser device 14 and second
Photomultiplier tube 16 is corresponding, and two groups form vertical 90 ° of structures, is fixed on the disk of middle layer, disk and the fixed company of shaft
It connects.The optical path crosspoint of two groups of scattering laser device transmitting laser, i.e. test point 12 in Laser Aiming Module.Scattering laser device continues
, since particulate has blocked laser, make to connect on photomultiplier tube when passing through aerosol to photomultiplier tube transmitting laser
It can not receive laser and produce light pulse.Pulse laser can be just successfully triggered since the voltage peak-to-peak value of electric pulse needs to reach 5V
Device, it is therefore desirable to keep the peak-to-peak value of light pulse sufficiently large, that is, the area for making laser be blocked is sufficiently large, i.e., aerosol is dense
It spends sufficiently large, can just successfully trigger pulse laser.Light pulse is converted electric pulse by photomultiplier tube.
The conversion time of the photomultiplier tube of selection is 36 μ s, and the flow distance of particulate can be within the response time
It ignores.The intersection point for the laser optical path that two groups of scattering laser devices and photomultiplier tube are constituted, i.e. test point.When two groups of photoelectricity times
When the electric pulse that increasing pipe generates is all sufficiently large, show that test point has the sufficiently high particulate of concentration, at this point, starting laser swashs
It sends out module and emits focusing laser pulses to test point, generate plasma.
As shown in figure 3, being laser excitation module diagram, laser excitation module includes a pulse laser 5 and focuses
Lens, pulse laser 5 are fixed on the first rotating base 6, and pulse laser 5 emits laser and is always after condenser lens
Test point position.The first rotating bar 17 is fixed on first rotating base 6, and the first rotation is driven by the first rotating bar 17
Pedestal 6 is rotated around shaft, and the function of being excited from different directions to particulate can be reached using this structure.
As shown in figure 4, being spectral signal receiving module schematic diagram, the spectral signal receiving module includes spectrometer
CCD9, the fibre-optical probe of spectrometer CCD9 are fixed on the second rotating base 10, and the second rotating base 10 can pass through second
Rotating bar 18 rotates, and optical fiber carries out spectral detection against test point plasma always.Using this structure can reach from
The function that different direction plasma is detected.
As shown in figure 5, being locating module schematic diagram.The locating module is connect with shaft, drives shaft horizontal movement.This
Matched 11 diameter of aerosol pipe is 50mm (so the dual-axle motor in locating module can move with the present invention in embodiment
Dynamic range is the square area that side length is 60mm, can satisfy detection needs.By first motor 19 and the second electricity in structure
20 controlled level direction two axle movement of machine is driven by the first conveyer belt 21 and the second conveyer belt 22 respectively, passes through first respectively
Deck 23 and the second deck 24 are separately fixed on the first conveyer belt 21 and the second conveyer belt 22, pass through the first strut 25 and second
Strut 26 is threadedly coupled with the first deck and the second deck respectively, is adaptively to move at two screw thread in deck movement
Strut is fixed in shaft.There is the thread spindle being attached with strut in deck center, it can be in strut direction or back
When mobile from deck, make strut rotation by deck using the rotation of thread spindle, play the role of adaptive with strut, guarantee
Free movement to a direction, calibration to another direction.Conveyer belt is driven by two motors on the whole, drives card
Seat, come control shaft horizontal direction position change, by control motor rotation can drive connection Laser Aiming Module, swash
The movement of light excitation module and the shaft of spectral signal receiving module makes the position of test point change, can be more accurate
Capture aerosol particle.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of aerosol for laser induced breakdown spectroscopy detects sighting device, which is characterized in that the device includes:
Laser Aiming Module is two groups of right-angled intersection of scattering laser device and photomultiplier tube, the laser that scattering laser device generates
By being received after aerosol pipe by photomultiplier tube, the optical path crosspoint of the laser of generation is as checkpoint；
Laser excitation module, the optical path crosspoint for focusing on two groups of scattering laser device transmitting laser in Laser Aiming Module make to bring about the desired sensation
Colloidal sol generates plasma；
Spectral signal receiving module, the spectroscopic data for the plasma that detection aerosol generates.
2. sighting device described in accordance with the claim 1, which is characterized in that the laser excitation module is rotated around crosspoint,
The spectral signal receiving module is rotated around crosspoint.
3. sighting device according to claim 1 or 2, which is characterized in that the aerosol pipe is placed in transparent interior idle running
In axis, the both ends of the shaft passes through rolling bearing respectively and is connected with the first rotating base and the second rotating base, and the laser swashs
Hair module is placed in the first rotating base, and the spectral signal receiving module is placed in the second rotating base, passes through the first rotating base
The excitation and detection of different directions are realized around the rotation of shaft with the second rotating base.
4. sighting device described in accordance with the claim 3, which is characterized in that on first rotating base and the second rotating base
It is respectively arranged with a rotating bar, drives the first rotating base and the second rotating base to rotate around shaft by the rotating bar.
5. sighting device described in accordance with the claim 3, which is characterized in that the Laser Aiming Module setting rotates bottom first
In middle layer between seat and the second rotating base, the middle layer is fixed in the shaft.
6. sighting device described in accordance with the claim 1, which is characterized in that the shaft connects a locating module, passes through positioning
Module realizes movement, changes the position of checkpoint.
7. sighting device according to claim 6, which is characterized in that the locating module includes two vertical first and passes
Band and the second transmission belt are sent, is driven respectively by motor, a deck is set on each conveyer belt, is threadedly coupled one on each deck
Strut is fixed in shaft by the other end of strut, is to be able to drive the movement of branch rod adaptive screw thread in deck movement, is realized
Two axis scannings can be carried out in the horizontal direction in test point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344042.XA CN110044875B (en) | 2019-04-26 | 2019-04-26 | Aerosol detection aiming device for laser-induced breakdown spectroscopy technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344042.XA CN110044875B (en) | 2019-04-26 | 2019-04-26 | Aerosol detection aiming device for laser-induced breakdown spectroscopy technology |
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| Publication Number | Publication Date |
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| CN110044875A true CN110044875A (en) | 2019-07-23 |
| CN110044875B CN110044875B (en) | 2024-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441288A (en) * | 2019-08-28 | 2019-11-12 | 南京信息工程大学 | A kind of multi-angle objective plasma collection device |
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| CN110044875B (en) | 2024-04-19 |
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