CN117825357A - Filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and system - Google Patents
Filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and system Download PDFInfo
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- CN117825357A CN117825357A CN202211201917.9A CN202211201917A CN117825357A CN 117825357 A CN117825357 A CN 117825357A CN 202211201917 A CN202211201917 A CN 202211201917A CN 117825357 A CN117825357 A CN 117825357A
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- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 title claims abstract description 51
- 238000004458 analytical method Methods 0.000 title claims abstract description 18
- 208000028659 discharge Diseases 0.000 claims abstract description 92
- 239000007788 liquid Substances 0.000 claims abstract description 73
- 238000001228 spectrum Methods 0.000 claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 25
- 239000013307 optical fiber Substances 0.000 claims description 23
- 238000013519 translation Methods 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 16
- 238000000608 laser ablation Methods 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 14
- 239000007787 solid Substances 0.000 abstract description 6
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- 210000002381 plasma Anatomy 0.000 description 45
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- 230000003595 spectral effect Effects 0.000 description 9
- 239000010687 lubricating oil Substances 0.000 description 6
- 238000004445 quantitative analysis Methods 0.000 description 6
- 238000010183 spectrum analysis Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
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- 238000004451 qualitative analysis Methods 0.000 description 3
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- 238000000295 emission spectrum Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 239000010937 tungsten Substances 0.000 description 1
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Abstract
The invention relates to a filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and a system; the method solves the problems that in the prior art, a direct measurement method is adopted for LIBS detection of a liquid sample, plasma is easy to quench, and the spectrum intensity is low; and the problem that coffee ring effect is easy to generate by adopting a method of converting liquid into solid; the method comprises the following steps: step 1: uniformly dripping the liquid sample on the filter paper to realize enrichment of the filter paper on the liquid sample, so as to form a sample layer on the surface of the filter paper; step 2: opening a laser, converging laser emitted by the laser, then incident into a sample layer, exciting to generate liquid sample plasma, and performing secondary discharge excitation on the liquid sample plasma; step 3: collecting a spectrum signal generated after secondary discharge excitation of plasma of a liquid sample, and analyzing the spectrum signal to obtain a plasma spectrogram of the liquid sample; the invention also provides a system based on the method.
Description
Technical Field
The invention relates to a spectrum analysis system and a spectrum analysis method, in particular to a filter paper enrichment and high-voltage discharge laser-induced breakdown spectrum analysis method and a filter paper enrichment and high-voltage discharge laser-induced breakdown spectrum analysis system.
Background
The Laser-induced breakdown spectroscopy (Laser-Induced Breakdown Spectroscopy, LIBS for short) is a novel element analysis technique based on atomic emission spectroscopy, and has important application value in the aspects of qualitative identification and quantitative detection because the technique has the advantages of quick in-situ multi-element real-time online detection, no need of complex pretreatment on samples and the like.
LIBS can realize the omnibearing detection of gas, liquid and solid, and is widely applied to the fields of geological detection, cultural relic identification, archaeology, deep space and deep sea detection, environment detection and the like at present. However, compared with other detection technologies, the LIBS technology has low spectral intensity, large signal fluctuation, poor detection sensitivity and high detection limit aiming at qualitative and quantitative analysis of trace elements in a liquid sample, and the defects become bottlenecks for restricting the development of the LIBS technology, so that the LIBS technology is highly valued by wide LIBS researchers.
At present, for detection of liquid samples, the LIBS technology often has two ideas:
1) Direct measurement of liquid samples: generating plasma directly in the liquid sample by utilizing single or multiple pulses, and realizing qualitative and quantitative analysis by collecting spectrum information of the plasma;
2) Converting the liquid to a solid: after a liquid sample is converted into a solid sample by electrochemical deposition, graphene sheet adsorption, freezing and other methods, high-energy laser is utilized to excite plasma, so that detection and analysis of elements in the liquid are realized.
Although the above two methods achieve LIBS detection of liquid samples to some extent, there are still certain problems:
in the first scheme, the liquid sample is directly measured, the plasma is easy to quench, the spectrum intensity is low, and the analysis capability of LIBS technology is limited; meanwhile, the laser irradiates the liquid to generate sputtering of the liquid level, which is very easy to pollute an optical system;
in the second approach, a long sample pretreatment process is often required, and a coffee ring effect is easily generated, which affects the accuracy and sensitivity of quantitative analysis of the LIBS technology, and is also contrary to the original purpose of rapid, real-time and efficient LIBS.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, a direct measurement method is adopted for LIBS detection of a liquid sample, plasma is easy to quench, the spectrum intensity is low, the analysis capability of the LIBS technology is limited, and an optical system is extremely easy to pollute; and a method of converting liquid into solid is adopted, so that the coffee ring effect is easy to generate, the accuracy and the sensitivity of quantitative analysis of the LIBS technology are affected, and the filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and system are provided.
The technical scheme adopted by the invention is as follows:
the filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method is characterized by comprising the following steps of:
step 1: uniformly dripping the liquid sample on the filter paper to realize enrichment of the filter paper on the liquid sample, so as to form a sample layer on the surface of the filter paper;
step 2: opening a laser, converging laser emitted by the laser, then incident into a sample layer, exciting to generate liquid sample plasma, and performing secondary discharge excitation on the liquid sample plasma;
step 3: and collecting a spectrum signal generated after the plasma of the liquid sample is excited by secondary discharge, and analyzing the spectrum signal to obtain a plasma spectrum diagram of the liquid sample.
Further, the step 1 further includes: placing the filter paper enriched with the liquid sample on a three-dimensional translation stage;
the step 2 further includes: the three-dimensional translation stage is controlled to drive the filter paper enriched with the liquid sample to move, so that laser emitted by the laser is incident on different positions of the sample layer.
Further, in order to improve the laser ablation efficiency and avoid the interference of gas above a breakdown sample on plasma, the energy of the laser is 10-100mJ, and the focus of the laser is arranged at a position 2-6mm vertically below the filter paper.
The invention also provides a filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis system, which is used for realizing the filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method, and is characterized in that:
the device comprises a laser ablation module, a spectrum acquisition module, a discharge module and a data analyzer;
the laser ablation module comprises a laser, a reflecting mirror, a dichroic mirror and a first converging lens; the reflecting mirror is positioned on an emergent light path of the laser, laser reflected by the reflecting mirror is incident on an incident surface of the dichroic mirror and is transmitted to the first converging lens through the dichroic mirror, emergent light of the first converging lens is vertically incident on filter paper for enriching the liquid sample, and the liquid sample plasma is generated by excitation; spectral signals generated by the liquid sample plasma are reflected by the dichroic mirror after passing through the first converging lens;
the spectrum acquisition module comprises a second converging lens, an optical fiber detector and a spectrum analyzer connected with the optical fiber detector, wherein the second converging lens and the optical fiber detector are sequentially arranged on a reflecting light path of the dichroic mirror; the spectrum signals reflected by the dichroic mirror are converged by the second converging lens and then enter an optical fiber detector, and the optical fiber detector transmits the optical signals to a spectrum analyzer through an optical fiber;
the discharging module comprises a direct current power supply, a charging circuit and a discharging circuit, wherein the discharging circuit is arranged above the filter paper, the charging circuit is connected with the direct current power supply and used for realizing charging, and the discharging circuit is connected with the charging circuit and used for discharging;
the data analyzer is connected with the spectrum analyzer and is used for receiving the spectrum signals collected by the spectrum analyzer and generating a plasma spectrogram.
Further, the charging circuit comprises an inductor, a diode and a capacitor;
one end of the inductor is connected with the grounding end of the direct current power supply, the other end of the inductor is connected with the cathode of the diode, the anode of the diode is connected with the cathode of the capacitor, and the anode of the capacitor is connected with the anode of the direct current power supply;
the discharging circuit is connected with two ends of the capacitor.
Further, the discharge circuit comprises a discharge cathode and a discharge anode;
the discharge cathode is connected with the negative electrode of the capacitor, and the discharge anode is connected with the positive electrode of the capacitor;
the discharge cathode and the discharge anode are oppositely arranged parallel to the filter paper; the distance between the discharge cathode and the discharge anode is 3-6mm, and the vertical distance between the discharge cathode and the discharge anode and the surface of the filter paper is 2-3mm.
Further, in order to be able to reduce the errors of the measurements, a three-dimensional translation stage is included;
the filter paper is arranged on the three-dimensional translation table, and the discharge cathode and the discharge anode are fixed on the three-dimensional translation table.
Further, the inductance is 5-40mH, and the capacitance is 10-100nF;
the output voltage of the direct current power supply is 1000-5000V.
Further, the energy of the laser is 10-100mJ, and the laser focus is arranged at a position 2-6mm vertically below the filter paper.
The beneficial effects of the invention are as follows:
1. in the invention, the method of exciting the plasma by secondary discharge is adopted, so that the spectrum signal intensity of the plasma can be greatly enhanced.
2. According to the method for enriching the sample by using the filter paper, the sample is not required to be subjected to complex pretreatment, so that the influence of the matrix effect of the liquid on the plasma spectrum signal can be reduced, and the accuracy of quantitative analysis can be improved.
3. In the invention, the total cost of the experimental device is low, the light path is simple, and complex light path calibration is not required.
4. In the invention, the advantage of advanced charging by adopting the charging circuit is that: direct contact of the direct current power supply with the discharge loop can be avoided; and the capacitor stores electric energy, which is more beneficial to stabilizing secondary excitation plasma.
5. In the invention, the three-dimensional translation stage is arranged, so that the serious ablation of the laser on the same part of the sample layer can be avoided, and the laser ablation can be performed on different positions of the sample layer by controlling the three-dimensional translation stage to average the emission spectra of different areas of the sample layer, so that the measurement error can be reduced.
6. In the invention, the energy of the laser is 10-100mJ, and the laser focus is arranged at the position of 2-6mm vertically below the filter paper, which has the advantages that: the laser ablation efficiency is improved, and the interference of gas above a breakdown sample on plasma is avoided.
7. In the invention, the distance between the discharge cathode and the discharge anode is 3-6mm, and the vertical distance between the discharge cathode and the discharge anode and the surface of the filter paper is 2-3mm, which has the advantages that: the coupling efficiency of the discharge energy and the plasma is improved, the secondary excitation of the plasma is facilitated, and therefore a plasma spectrum with higher strength is obtained.
Drawings
FIG. 1 is a system schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a discharge module (including filter paper, a three-dimensional translation stage, and a first converging lens) according to an embodiment of the present invention;
FIG. 3 is a chart showing the plasma spectrum of the lubricating oil obtained by combining the filter paper enrichment with the high-voltage discharge auxiliary LIBS technology, a chart showing the plasma spectrum of the lubricating oil obtained by combining the filter paper enrichment with the traditional LIBS technology, and a chart showing the plasma spectrum of the lubricating oil obtained by combining the silicon-based method with the traditional LIBS technology in the embodiment of the invention.
In the figure, 1, a laser; 2. a spectrum analyzer; 3. an optical fiber detector; 5. a data analyzer; 6. a data line; 7. a first laser beam; 8. a reflecting mirror; 9. a dichroic mirror; 10. a first converging lens; 11. converging excitation laser; 12. a three-dimensional translation stage; 13. a second converging lens; 14. collecting light in a converging way; 15. a discharge cathode; 16. a discharge anode; 17. a direct current power supply; 18. an inductance; 19. a diode; 20. a capacitor; 21. an electric wire; 22. and (3) filtering paper.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis system, which is shown in figures 1 and 2 and comprises a laser ablation module, a spectrum acquisition module, a discharge module and a data analyzer 5;
the filter paper 22 enriched with the liquid sample is arranged on the laser emergent light path of the laser ablation module;
the function of each module is as follows:
the laser ablation module is used for ablating the liquid sample on the filter paper 22; the discharging module is used for enhancing the spectrum of the liquid sample through discharging, the spectrum collecting module is used for collecting the spectrum information of the liquid sample and sending the spectrum information to the data analyzer 5 for analysis, and the data analyzer 5 generates a spectrogram from the received spectrum information;
the arrangement mode of each module is as follows:
as shown in fig. 1, the laser ablation module comprises a laser 1, a mirror 8, a dichroic mirror 9, a first converging lens 10; the reflecting mirror 8, the dichroic mirror 9, the first converging lens 10 and the filter paper 22 are sequentially arranged along the outgoing path of the laser 1, the reflecting mirror 8 and the dichroic mirror 9 are parallel to each other, the incident surface of the dichroic mirror 9 is positioned on the outgoing light path of the reflecting mirror 8, the outgoing surface of the dichroic mirror 9 is positioned on the incident light path of the first converging lens 10, and the filter paper 22 is used for enriching the liquid sample;
the laser emitted by the laser 1 is reflected by the reflecting mirror 8, then enters the incident surface of the dichroic mirror 9, is transmitted to the first converging lens 10 through the dichroic mirror 9, and the emergent light of the first converging lens 10 vertically enters the filter paper 22 for enriching the liquid sample, so as to excite and generate the liquid sample plasma; the spectral signal generated by the plasma of the liquid sample is reflected by the dichroic mirror 9 after passing through the first converging lens 10.
The spectrum acquisition module comprises a second converging lens 13, an optical fiber detector 3 and a spectrum analyzer 2 connected with the optical fiber detector 3; the second converging lens 13 and the optical fiber detector 3 are sequentially arranged along the reflection path of the emergent surface of the dichroic mirror 9, the spectrum signal reflected by the dichroic mirror 9 is converged by the second converging lens 13 and then enters the optical fiber detector 3, and the optical fiber detector 3 transmits the optical signal to the spectrum analyzer 2 through the optical fiber.
As shown in fig. 2, the discharging module includes a dc power supply 17, a charging circuit, and a discharging circuit, the charging circuit includes an inductor 18, a diode 19, and a capacitor 20; one end of the inductor 18 is connected with the grounding end of the direct current power supply 17, the other end of the inductor is connected with the cathode of the diode 19, the anode of the diode 19 is connected with the cathode of the capacitor 20, and the anode of the capacitor 20 is connected with the anode of the direct current power supply 17; the discharge circuit comprises a discharge cathode 15 and a discharge anode 16; the positive electrode of the direct current power supply 17 is connected with the positive electrode of the capacitor 20, the discharge cathode 15 is connected with the negative electrode of the capacitor 20 through a wire 21, the discharge anode 16 is connected with the positive electrode of the capacitor 20 through the wire 21, and the output voltage of the direct current power supply 17 is 1000-5000V;
the spectrum analyzers 2 are all connected with the data analyzer 5 through data lines 6, and are used for sending the spectrum data analyzed by the spectrum analyzers 2 to the data analyzer 5 for spectrum analysis.
In this embodiment, the medium speed filter paper 22 is used to enrich the liquid sample, and microliter of the liquid sample is dripped into the dry filter paper 22, and a sample layer is formed on the surface of the filter paper 22 after the filter paper 22 absorbs and enriches the liquid.
To avoid severe laser ablation of the same portion of the sample layer and to reduce measurement errors, filter paper 22 is mounted on the three-dimensional translation stage 12.
The inductance 18 is 5-40mH and the capacitance 20 is 10-100nF.
The energy of the laser is 10-100mJ, and the laser focus is arranged at a position 2-6mm vertically below the filter paper 22.
The laser 1 adopts a Nd-YAG solid laser.
The electrode material should have the characteristics of good conductivity and simple element types.
Before testing, the filter paper enrichment method is combined with the high-voltage discharge auxiliary laser-induced breakdown spectroscopy analysis system to assemble, when the filter paper enrichment method is assembled, the discharge cathode 15 and the discharge anode 16 are arranged on the three-dimensional translation table 12 and are positioned above the filter paper 22, the control of the discharge cathode 15 and the discharge anode 16 is realized by adjusting the three-dimensional translation table 12, the interval between the discharge cathode 15 and the discharge anode 16 is 3-6mm, the discharge cathode 15 and the discharge anode 16 are parallel to the filter paper 22 and are perpendicular to incident laser of the filter paper 22, and the vertical distance between the discharge cathode 15 and the discharge anode 16 and the surface of the filter paper 22 to be placed is 2-3mm.
The working principle of the invention is as follows:
the direct current power supply 17 is connected with an alternating current power supply with 220V and 50Hz frequency to charge the capacitor 20;
after laser passes through the reflecting mirror 8 and the dichroic mirror 9, the laser is focused on the surface of the filter paper 22 through the first converging lens 10, liquid sample plasmas are excited and generated, the liquid sample plasmas generated by laser induction contain a large amount of free charges, the charges exist between the discharge cathode 15 and the discharge anode 16 as seed charges, the discharge cathode 15 and the discharge anode 16 are conducted, the charges stored in the capacitor 20 are injected into the liquid sample plasmas, the liquid sample plasmas are excited again, and the spectral line intensity of the liquid sample plasmas is enhanced.
The characteristic spectrum emitted by the plasma of the liquid sample is collected through the optical fiber detector 3, the optical fiber detector 3 is connected with the spectrum analyzer 2, the characteristic spectrum is coupled into the spectrum analyzer 2, the collection of spectrum data is completed, and the spectrum signal obtained through the identification and measurement of the data analyzer 5 is used for realizing the qualitative and quantitative analysis of the target element.
The invention also provides an analysis method based on the system, which comprises the following steps:
step 1: uniformly dripping a trace amount of liquid sample on the filter paper 22 by using a dropper to realize enrichment of the filter paper 22 on the liquid sample, so that a sample layer is formed on the surface of the filter paper 22, and horizontally placing the filter paper 22 enriched with the liquid sample on the three-dimensional translation table 12;
step 2: opening the laser 1, converging the laser emitted by the laser 1 and then making the laser enter the sample layer to excite the liquid sample plasma, and carrying out secondary discharge excitation on the generated sample of the liquid sample plasma;
specific:
2.1, externally connecting a direct current power supply 17 with an alternating current power supply with 220V and 50Hz frequency to charge a capacitor 20, and after the capacitor 20 is charged, storing a large amount of charges;
2.2 after the first beam of laser 7 emitted by the laser 1 passes through the reflecting mirror 8, the dichroic mirror 9 and the first converging lens 10, the first beam of laser is focused on the surface of the filter paper 22, and the liquid sample plasma is excited, at this time, a large amount of free electrons and ions in the liquid sample plasma exist between the discharge cathode 15 and the discharge anode 16 as seed charges, so that a circuit is communicated and a spark discharge process is generated, a large amount of charges are injected into the liquid sample plasma from the capacitor 20, the reheating and excitation of the liquid sample plasma are realized, so that the spectrum of the liquid sample plasma is greatly enhanced, as shown in fig. 3, in the experiment, in order to avoid serious ablation of the same part of the sample surface by a laser beam, the three-dimensional translation table 12 is controlled to enable the laser ablation to be carried out on different positions on the surface of the filter paper 22, and the emission spectra of different areas on the surface of the filter paper 22 are averaged, so that the measured errors can be reduced to a certain extent;
step 3: as shown in fig. 1, a spectrum signal generated by the plasma of the liquid sample returns along the original path of the converged excitation laser 11, is reflected by the dichroic mirror 9 after passing through the first converging lens 10, forms converged collected light 14 after passing through the second converging lens 13, enters the optical fiber detector 3, and the optical fiber detector 3 transmits the optical signal to the spectrum analyzer 2 through an optical fiber;
the data analyzer 5 receives the spectrum signals collected by the spectrum analyzer 2, performs spectrum analysis, namely, converts the measured spectrum signals into a spectrum pattern, the abscissa is a pattern of light wavelength, the ordinate is an intensity value, and compares the wavelength and the relative intensity of each spectrum peak in the obtained spectrum pattern with the wavelength and the relative intensity of each element in the standard database, so as to obtain the element composition and the relative content of each element in the measured sample.
As shown in fig. 3, a spectrum of lubricating oil plasma using filter paper enrichment combined with high-voltage discharge assisted LIBS technology, a spectrum of lubricating oil plasma using filter paper enrichment combined with conventional LIBS technology, and a spectrum of lubricating oil plasma using silicon-based method combined with conventional LIBS technology are shown, wherein the abscissa represents spectral line wavelength in nm (nanometers), the ordinate represents measured spectral intensity, and the unit a.u. (arc unit) represents relative value units measured by an instrument. Filter paper & D-LIBS means that Filter paper enrichment is combined with discharge-assisted laser induced breakdown spectroscopy, filter paper & C-LIBS means that Filter paper enrichment is combined with traditional laser induced breakdown spectroscopy, and silicon substrate & C-LIBS means that silicon-based method is combined with traditional laser induced breakdown spectroscopy; ca. W, CN represent calcium element, tungsten element and carbon-nitrogen molecule, respectively.
From fig. 3, it can be derived that, in the conventional LIBS, compared with the silicon-based method, the filter paper enrichment can improve the spectral intensity of the plasma, and, on the basis of the filter paper enrichment, the use of the high-voltage discharge-assisted LIBS can further greatly improve the spectral intensity of the sample plasma, and can measure more spectral lines with high ionization energy, which are difficult to detect by the conventional LIBS technology.
Claims (9)
1. The filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method is characterized by comprising the following steps of:
step 1: uniformly dripping the liquid sample on the filter paper (22) to realize enrichment of the filter paper (22) on the liquid sample, so as to form a sample layer on the surface of the filter paper (22);
step 2: opening a laser (1), converging laser emitted by the laser (1) and then entering a sample layer, exciting to generate liquid sample plasma, and performing secondary discharge excitation on the liquid sample plasma;
step 3: and collecting a spectrum signal generated after the plasma of the liquid sample is excited by secondary discharge, and analyzing the spectrum signal to obtain a plasma spectrum diagram of the liquid sample.
2. The filter paper enrichment combined high-voltage discharge laser-induced breakdown spectroscopy method according to claim 1, wherein the method comprises the following steps of:
the step 1 further includes: placing a filter paper (22) enriched with a liquid sample on a three-dimensional translation stage (12);
the step 2 further includes: the three-dimensional translation stage (12) is controlled to drive the filter paper (22) enriched with the liquid sample to move, so that laser emitted by the laser (1) is incident on different positions of the sample layer.
3. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy method according to claim 1 or 2, wherein:
the energy of the laser is 10-100mJ, and the focus of the laser is arranged at a position which is 2-6mm below the filter paper (22) vertically.
4. A filter paper enrichment-combined high-voltage discharge laser-induced breakdown spectroscopy analysis system for realizing the filter paper enrichment-combined high-voltage discharge laser-induced breakdown spectroscopy analysis method according to any one of claims 1 to 3, characterized in that:
comprises a laser ablation module, a spectrum acquisition module, a discharge module and a data analyzer (5);
the laser ablation module comprises a laser (1), a reflecting mirror (8), a dichroic mirror (9) and a first converging lens (10); the reflecting mirror (8) is positioned on an emergent light path of the laser (1), laser light reflected by the reflecting mirror (8) is incident on an incident surface of the dichroic mirror (9) and is transmitted to the first converging lens (10) through the dichroic mirror (9), and emergent light of the first converging lens (10) is vertically incident on filter paper (22) for enriching a liquid sample, so that liquid sample plasma is excited and generated; the spectrum signal generated by the liquid sample plasma is reflected by the dichroic mirror (9) after passing through the first converging lens (10);
the spectrum acquisition module comprises a second converging lens (13), an optical fiber detector (3) and a spectrum analyzer (2) connected with the optical fiber detector (3), which are sequentially arranged on a reflecting light path of the dichroic mirror (9); the spectrum signals reflected by the dichroic mirror (9) are converged by the second converging lens (13) and then enter the optical fiber detector (3), and the optical fiber detector (3) sends the optical signals to the spectrum analyzer (2) through the optical fiber;
the discharging module comprises a direct current power supply (17), a charging circuit and a discharging circuit, wherein the discharging circuit is arranged above the filter paper (22), the charging circuit is connected with the direct current power supply (17) and used for realizing charging, and the discharging circuit is connected with the charging circuit and used for discharging;
the data analyzer (5) is connected with the spectrum analyzer (2) and is used for receiving the spectrum signals collected by the spectrum analyzer (2) and generating a plasma spectrogram.
5. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy system of claim 4, wherein:
the charging circuit comprises an inductor (18), a diode (19) and a capacitor (20);
one end of the inductor (18) is connected with the grounding end of the direct current power supply (17), the other end of the inductor is connected with the cathode of the diode (19), the anode of the diode (19) is connected with the cathode of the capacitor (20), and the anode of the capacitor (20) is connected with the anode of the direct current power supply (17);
the discharging circuit is connected with two ends of the capacitor (20).
6. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy system of claim 5, wherein:
the discharge circuit comprises a discharge cathode (15) and a discharge anode (16);
the discharge cathode (15) is connected with the negative electrode of the capacitor (20), and the discharge anode (16) is connected with the positive electrode of the capacitor (20);
the discharge cathode (15) and the discharge anode (16) are oppositely arranged parallel to the filter paper (22); the distance between the discharge cathode (15) and the discharge anode (16) is 3-6mm, and the vertical distance between the discharge cathode (15) and the discharge anode (16) and the surface of the filter paper (22) is 2-3mm.
7. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy system of claim 6, wherein:
also comprises a three-dimensional translation stage (12);
the filter paper (22) is arranged on the three-dimensional translation table (12), and the discharge cathode (15) and the discharge anode (16) are fixed on the three-dimensional translation table (12).
8. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy system of claim 7, wherein:
the inductance (18) is 5-40mH, and the capacitance (20) is 10-100nF;
the output voltage of the direct current power supply (17) is 1000-5000V.
9. The filter paper enrichment combined with high-voltage discharge laser induced breakdown spectroscopy system according to any one of claims 4-8, wherein:
the energy of the laser is 10-100mJ, and the laser focus is arranged at a position which is 2-6mm below the filter paper (22) vertically.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211201917.9A CN117825357A (en) | 2022-09-29 | 2022-09-29 | Filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and system |
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| CN202211201917.9A CN117825357A (en) | 2022-09-29 | 2022-09-29 | Filter paper enrichment and high-voltage discharge laser-induced breakdown spectroscopy analysis method and system |
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| CN117825357A true CN117825357A (en) | 2024-04-05 |
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