CN212341016U - Breakdown Spectroscopy Detection System Based on Ring Magnetic Confinement Technology - Google Patents
Breakdown Spectroscopy Detection System Based on Ring Magnetic Confinement Technology Download PDFInfo
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Abstract
本实用新型提供了一种基于环状磁约束技术的击穿光谱检测系统，所述系统包括激光发射机构、环状磁场机构、检测机构、信号采集机构和计算机；所述检测机构包括用于放置被测样品的置物台，所述环状磁场机构包括环绕所述置物台设置的N极大磁铁、S极大磁铁、第一N极小磁铁、第二N极小磁铁、第一S极小磁铁和第二S极小磁铁；本实用新型将激光诱导击穿光谱技术与环状磁场约束组合测量具有更高的灵敏度和准确度，本实用新型采用的是环状磁场，为激光诱导击穿光谱技术的谱线增强方法提供了新的思路，在该领域具有广阔的应用前景。
The utility model provides a breakdown spectrum detection system based on annular magnetic confinement technology. The system includes a laser emission mechanism, an annular magnetic field mechanism, a detection mechanism, a signal acquisition mechanism and a computer; the detection mechanism includes a device for placing A stage for the sample to be tested, and the annular magnetic field mechanism includes an N-maximum magnet, an S-maximum magnet, a first N-miniature magnet, a second N-miniature magnet, a first S-miniature magnet, and a first S-miniature magnet arranged around the object table A magnet and a second S-miniature magnet; the utility model combines the laser-induced breakdown spectroscopy technology with the annular magnetic field to constrain the measurement to have higher sensitivity and accuracy, and the utility model adopts the annular magnetic field, which is the laser-induced breakdown The spectral line enhancement method provides a new idea and has broad application prospects in this field.
Description
Technical Field
The utility model belongs to the technical field of the spectrum detection technique and specifically relates to a puncture spectrum detecting system based on cyclic annular magnetic confinement technique is related to.
Background
Laser induced breakdown spectroscopy is a common technique for atomic emission spectroscopy. The technology focuses high-power laser pulses on the surface of a sample to generate plasma, a spectrum detector detects a spectrum signal emitted by the plasma, and the high-power laser pulses can be used for qualitative and quantitative analysis of the sample by analyzing the intensity of a characteristic peak corresponding to an element in a spectrogram. The laser-induced breakdown spectroscopy technology has the characteristics of no need of pretreating a sample and detection of various elements, is extremely low in sample consumption and small in destructiveness, realizes micro-loss and even nearly nondestructive detection, and has wide application prospects in the analysis fields of metallurgy, soil and the like.
Recent studies have shown that laser-induced breakdown spectroscopy is still lacking. Such as poor reproducibility, poor accuracy of quantitative analysis, etc. Poor repeatability is usually compensated by adopting a method of taking an average value through multiple tests; the problem of poor accuracy of quantitative analysis often needs to be improved by adding constraints in the laser-induced breakdown spectroscopy technical system. If magnetic field constraint and cavity constraint are increased, double-pulse excitation is adopted, nano metal particles are added, preheating is carried out and the like, the signal-to-noise ratio of spectral signals can be improved, and the accuracy of quantitative analysis is improved.
As a result of investigations, spatial constraints, preheating, magnetic field constraints, and the like are typical of the laser-induced breakdown spectroscopy enhancement technique. Space constraints are widely used by virtue of the advantages of simple operation, easy implementation and the like. But the maximum spectral enhancement rate cannot be obtained due to the compression nonuniformity; preheating is an important method for influencing the LIBS line intensity, the line emission intensity is enhanced along with the increase of the temperature of a sample by changing the initial temperature of the sample, so that the characteristic line emission intensity is enhanced, but the instability of the contact of the front edge of the plasma and air is caused by the variability of the environment; the magnetic field constraint is to place the sample to be measured at the center of the magnetic field, focus the incident laser on the surface of the sample, and generate plasma in the magnetic field. The collision probability of particles in the plasma is increased under the action of magnetic lines of force, so that the signal intensity of atomic spectral lines and ion spectral lines is enhanced. Meanwhile, the confinement effect of the magnetic force lines can limit the expansion and diffusion speed of the plasma, so that the retention time of the plasma is prolonged, and the collision probability under the confinement of the magnetic field is enhanced, thereby increasing the electron temperature and the electron density.
When the laser-induced breakdown spectroscopy detection system carries out magnetic field restraint, two permanent magnets with opposite magnetism are placed on the left and right of a detected object, and a non-magnetic-conductive bracket is fixedly placed on the left and right of a sample to form a stable magnetic field. The confinement effect of the magnetic force lines can limit the expansion and diffusion speed of the plasma, so that the collision probability of particles in the plasma is increased under the action of the magnetic force lines, and the signal intensity of atomic spectral lines and ion spectral lines is enhanced.
In order to better enhance the effect of the magnetic field on the plasma confinement, prolong the retention time of the plasma in the magnetic field and enhance the collision probability of electrons and ions. The utility model discloses place two opposite big magnets of magnetism about the sample, place four opposite little magnets of magnetism from top to bottom, six magnets make and form an annular magnetic field around the sample. The system is built by combining the annular magnetic field and the laser-induced breakdown spectroscopy technology, the spectral intensity of heavy metal elements in a sample can be better improved, the detection limit is reduced, the spectral characteristic of plasma is more effectively enhanced, and the measurement result is more accurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a puncture spectrum detecting system based on cyclic annular magnetic confinement technique to solve current measurement system and to plasma confinement effect relatively weaker, the unsatisfactory problem of measuring effect.
The utility model adopts the technical proposal that: a breakdown spectrum detection system based on an annular magnetic confinement technology comprises a laser emission mechanism, an annular magnetic field mechanism, a detection mechanism, a signal acquisition mechanism and a computer;
the laser emission mechanism includes an Nd: YAG laser, reflector and focusing lens, the Nd: the YAG laser is used for emitting pulse laser, the reflecting mirror is used for changing the transmission direction of the pulse laser, the focusing lens is used for converging the pulse laser, and the converged pulse laser is emitted into the detection mechanism;
the detection mechanism comprises a placing table for placing a sample to be detected, and the annular magnetic field mechanism comprises an N-maximum magnet, an S-maximum magnet, a first N-minimum magnet, a second N-minimum magnet, a first S-minimum magnet and a second S-minimum magnet which are arranged around the placing table; the N-maximum magnet is positioned on the left side of the object placing table, the S-maximum magnet is positioned on the right side of the object placing table, the first N-minimum magnet and the first S-minimum magnet are positioned on the upper side of the object placing table, the second N-minimum magnet and the second S-minimum magnet are positioned on the lower side of the object placing table, the first N-minimum magnet is vertically opposite to the second S-minimum magnet, and the first S-minimum magnet is vertically opposite to the second N-minimum magnet;
the signal acquisition mechanism comprises an optical fiber and a spectrometer connected with the optical fiber, and the spectrometer is connected with a computer; the optical fiber is arranged close to the object placing table and used for collecting plasma generated by a tested sample and transmitting the plasma to the spectrometer; the computer is used for processing and analyzing the data of the signals input by the spectrometer.
The spectrometer is a marine optical Maya2000 fiber spectrometer.
And the Nd: the YAG laser can emit pulse laser with the wavelength of 1064 nm.
And a rotary platform is arranged at the center of the object placing platform, and the sample to be measured is arranged on the rotary platform.
The central axes of the N-maximum magnet, the S-maximum magnet, the first N-minimum magnet, the second N-minimum magnet, the first S-minimum magnet and the second S-minimum magnet are all in the same plane with the central axis of the rotary platform.
The laser emission mechanism includes a laser controller for controlling the Nd: YAG laser output energy.
The utility model combines the breakdown spectrum technology with the annular magnetic field constraint, takes an Nd pulse laser with the emission wavelength of 1064nm as a light source, changes the propagation direction after the laser emission pulse laser passes through the reflector, and is incident on a measured object after passing through the focusing lens. Under the natural environment, the surface of the object to be measured can be burned by laser to generate plasma, the number of the induced plasma can be increased under the constraint action of the annular magnetic field, the plasma is collected by one-to-two optical fibers and transmitted to the ocean optical Maya2000 optical fiber spectrometer, and finally the spectral data is processed and analyzed by a computer. The utility model discloses combine together laser-induced breakdown spectroscopy technique and cyclic annular magnetic field restraint and realize heavy metal element's in the soil detection. Compared with the existing measuring system and measuring method, the method has the following outstanding advantages:
1. the laser-induced breakdown spectroscopy technology and annular magnetic field constraint combined measurement method is provided, high-sensitivity and high-resolution measurement can be realized, the system detection capability is improved, and the reliability of the measurement result is ensured.
2. The laser-induced breakdown spectroscopy technology and the annular magnetic field constraint combination measurement can improve the emission spectrum signal of the laser-induced plasma, lower the detection limit of trace elements and improve the detection precision.
3. Laser-induced breakdown spectroscopy technique and cyclic annular magnetic field restraint combination measurement have higher sensitivity and the degree of accuracy, the utility model discloses a cyclic annular magnetic field provides new thinking for laser-induced breakdown spectroscopy's spectral line reinforcing method, has wide application prospect in this field.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Wherein, 1, laser controller, 2, Nd: YAG laser, 3, reflector, 4, spectrometer, 5, optical fiber, 6, focusing lens, 7, computer, 8, object placing table, 9, rotary platform, 10, sample to be measured, 11, first N minimum magnet, 12, first S minimum magnet, 13, second S minimum magnet, 14, second N minimum magnet, 15, N maximum magnet, 16, S maximum magnet.
Detailed Description
The present invention is further illustrated by the following examples, which are given by way of illustration only and are not to be construed as limiting the invention in any way.
As shown in fig. 1, the system of the present invention includes a laser emitting mechanism, an annular magnetic field mechanism, a detecting mechanism, a signal collecting mechanism and a computer 7.
The laser emission mechanism comprises a laser controller 1, an Nd: YAG laser 2, mirror 3 and focusing lens 6, laser controller 1 is used to control Nd: YAG laser 2 output energy, Nd: the YAG laser 2 is used for emitting pulse laser with the wavelength of 1064nm, the reflector 3 is used for changing the propagation direction of the pulse laser, and the focusing lens 6 is used for converging the pulse laser, so that the signal intensity is increased, the signal-to-noise ratio is improved, and the detection is convenient. The converged pulse laser is injected into a detection mechanism.
The detection mechanism comprises an object placing table 8 and a rotary platform 9 arranged on the object placing table 8, and a sample 10 to be detected is arranged on the rotary platform 9. The annular magnetic field mechanism comprises an N-maximum magnet 15, an S-maximum magnet 16, a first N-minimum magnet 11, a second N-minimum magnet 14, a first S-minimum magnet 12 and a second S-minimum magnet 13 which are arranged around the object placing table 8; the N-maximum magnet 15 is positioned on the left side of the object placing table 8, the S-maximum magnet 16 is positioned on the right side of the object placing table 8, the first N-minimum magnet 11 and the first S-minimum magnet 12 are positioned on the upper side of the object placing table 8, the second N-minimum magnet 14 and the second S-minimum magnet 13 are positioned on the lower side of the object placing table 8, the first N-minimum magnet 11 is vertically opposite to the second S-minimum magnet 13, and the first S-minimum magnet 12 is vertically opposite to the second N-minimum magnet 14; six magnets form an annular magnetic field around the object placing table 8, and the central axes of the six magnets and the central axis of the rotating platform 9 are in the same plane.
The signal acquisition mechanism comprises an optical fiber 5 and a spectrometer 4 connected with the optical fiber, and the laser controller 1 is connected with the spectrometer 4 and used for adjusting the time for acquiring signals by the spectrometer and emitting laser by the laser and determining the optimal delay time. The spectrometer 4 is an ocean optical Maya2000 optical fiber spectrometer, and the spectrometer 4 is connected with the computer 7; the optical fiber 5 is arranged close to the object placing table 8 and used for collecting plasma generated by the tested sample 10 and transmitting the plasma to the spectrometer 4; the computer 7 is used for data processing and analysis of the signals input by the spectrometer 4.
The steps of measuring by using the system are as follows:
1. constructing a breakdown spectrum and magnetic field constraint combined measurement system;
2. placing a tested sample on a placing table, placing a magnet as required, opening a laser, adjusting a reflector and a focusing lens to ensure that a light beam smoothly irradiates the tested sample, and carrying out an experiment on the basis of the light beam;
3. the tested sample and the light beam emitted by the laser perform a series of optical reactions and generate plasma in the reaction process;
4. the probe of the optical fiber receives the plasma, transmits data to the computer for processing and analysis after passing through the spectrometer.
YAG pulse laser with the emission wavelength of 1064nm is used as a light source in the laser induced breakdown spectroscopy technology, the laser emission pulse laser changes the propagation direction after passing through a reflector, the light intensity is increased through a focusing lens and then the laser emission pulse laser is applied to a sample to be detected, the surface of the sample to be detected is burnt by the laser to generate plasma under the natural environment, the number of the plasma is increased under the constraint action of an annular magnetic field, the plasma is collected by a one-to-two optical fiber and then transmitted to a marine optical Maya2000 optical fiber spectrometer, and finally data are processed and analyzed by a computer.
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| CN111879756A (en) * | 2020-08-28 | 2020-11-03 | 河北大学 | Breakdown spectrum detection system and method based on annular magnetic confinement technology |
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| CN111879756A (en) * | 2020-08-28 | 2020-11-03 | 河北大学 | Breakdown spectrum detection system and method based on annular magnetic confinement technology |
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