CN117054398A

CN117054398A - Device for enhancing laser-induced plasma

Info

Publication number: CN117054398A
Application number: CN202311023075.7A
Authority: CN
Inventors: 李欣; 温佳起; 豆贤安; 谢运涛; 卞进田
Original assignee: National University of Defense Technology
Current assignee: National University of Defense Technology
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2023-11-14

Abstract

The application belongs to the technical field of intelligent measurement and analysis of laser spectrum values, and discloses a device for enhancing laser-induced plasma, which comprises a frame body, wherein a base and a cavity are arranged on the frame body, the bottom of the cavity is attached to the top of the base, a first quartz window is arranged at the top of the cavity, a second quartz window is arranged on the side wall of the cavity, a laser is arranged above the first quartz window, an optical fiber probe is arranged at the second quartz window, a sample table is arranged on the base, a first focusing lens is arranged above the sample table in the cavity, and a second focusing lens is arranged between the sample table and an opening of the side wall on the cavity; a third quartz window is arranged on the other side wall of the cavity, a laser is also arranged outside the third quartz window, and a third focusing lens is arranged between the third quartz window and the sample table; the system also comprises a control analysis system, wherein the control analysis system is electrically connected with the laser and the optical fiber probe. The application can realize the enhancement of laser-induced plasma, thereby improving the detection stability and detection effect.

Description

Device for enhancing laser-induced plasma

Technical Field

The application belongs to the technical field of intelligent measurement and analysis of laser spectrum, and particularly relates to a device for enhancing laser-induced plasma.

Background

The Laser Induced Breakdown Spectroscopy (LIBS) technology is an analysis technology for rapidly and quantitatively detecting element components in a sample on site. The principle is that the method adopts high-energy density laser pulse to excite the analyzed substance to generate plasma, and simultaneously analyzes the energy level transition characteristic spectrum of atoms and ions in the plasma to obtain the variety and content of each element.

Along with the development of technology, the requirements of various industries are gradually increased, and laser-induced plasma is a complex process, and in the using process, the laser-induced plasma can be influenced by factors such as shaking of laser energy, characteristics of a sample, plasma temperature and the like, so that the detection stability can be influenced. It was found through research that the main factor that the stability of detection was affected was the signal attenuation of the plasma, and thus the inventors developed a device for enhancing laser-induced plasma.

Disclosure of Invention

The application aims to provide a device for enhancing laser-induced plasma, which aims to solve the technical problems in the prior art.

In order to achieve the above purpose, the application provides a device for enhancing laser-induced plasma, which comprises a frame body, wherein a base and a cavity are arranged on the frame body, the bottom of the cavity is attached to the top of the base, a first quartz window is arranged at the top of the cavity, a second quartz window is arranged on the side wall of the cavity, a laser is arranged above the first quartz window, an optical fiber probe is arranged at the second quartz window, the optical fiber probe is connected with a spectrometer, a sample table is arranged on the base, a first focusing lens is arranged above the sample table in the cavity, and a second focusing lens is arranged between the sample table and an opening of the side wall on the cavity; a third quartz window is arranged on the other side wall of the cavity, a laser is also arranged outside the third quartz window, and a third focusing lens is arranged between the third quartz window and the sample table; the system also comprises a control analysis system, wherein the control analysis system is electrically connected with the laser and the optical fiber probe.

In another preferred embodiment of the application, reflectors are arranged on the upper side and the lower side of the side, opposite to the second quartz window, of the cavity. The optical fibers can be reflected and then gathered, so that the effect of collecting the optical fibers is improved, and the detection effect and stability are improved.

In another preferred embodiment of the application, the interior of the cavity is hemispherical. The hemispherical constraint mode can improve the space constraint effect, and further enhance the laser-induced plasma.

In another preferred embodiment of the application, the cavity is communicated with an air inlet pipe and an air outlet pipe, the air inlet pipe is positioned at the lower part, the air outlet pipe is positioned at the upper part, and valves are arranged in the air inlet pipe and the air outlet pipe. High-temperature inert gas is led in through the air inlet pipe, and air in the cavity is discharged through the air outlet pipe, so that the interference of other ions in the air on the signal intensity of plasma can be reduced, and the stability and the effect of detection are improved.

In another preferred embodiment of the application, the base is vertically and slidably connected with the frame body, the cavity is fixed on the frame body, the bottom of the frame body is fixed with the air cylinder, and the pushing rod of the air cylinder is fixed with the bottom of the base. The cylinder can drive the base to vertically move, so that a sample to be measured can be conveniently placed on the sample table.

In another preferred embodiment of the application, the base is provided with a placing cavity, and the bottom of the cavity is positioned in the placing cavity; the inner vertical sliding connection of the placing cavity is provided with a driving plate, four communicating vessels are embedded in the base, the two ends of each communicating vessel are internally and slidably connected with sliding plates, and push rods are fixed on the sliding plates; one end of the communicating vessel faces upwards, the other end of the communicating vessel faces towards the four side walls of the cavity respectively, the push rod in the upward end is fixed with the driving plate, the push rod at the other end is fixed with a leakage-proof plate, and one side of the leakage-proof plate, which is close to the cavity, is provided with a leakage-proof layer.

The bottom of cavity sets up in placing the intracavity to through placing the bottom of cavity with the cavity and seal. When the cavity is positioned in the placing cavity, the driving plate in the placing cavity is extruded to move downwards, the driving plate extrudes the push rod, the other push rod can drive the anti-leakage plate to move through the linkage of the communicating vessel, the anti-leakage layer is tightly attached to the anti-leakage plate, the sealing effect is improved, and the leakage of inert gas is reduced.

In another preferred embodiment of the present application, the top of the leakage preventing plate is provided with a plurality of detection probes for detecting inert gas, and the leakage preventing plate further comprises an inert gas detector, and the detection probes are electrically connected with the inert gas detector; an expansion air bag is arranged between the leakage-proof plate and the leakage-proof layer, and an air pump is communicated with the expansion air bag. When debugging, if sealed effect is not good, inert gas in the cavity can leak, just can detect through detecting probe to guide in gas through the air pump to the gasbag in, gas expansion increases the effect of hugging closely between leak protection layer and the cavity outer wall, and then improves sealed effect.

In another preferred embodiment of the application, the cavity is an aluminum alloy cavity. The cavity of aluminum alloy can make the detection effect good.

In conclusion, the application has the beneficial effects that:

1. according to the application, the laser convergence effect can be improved through the gains of the first focusing lens and the second focusing lens, and the laser-induced plasma effect is further improved.

2. Through the synchronous action of space constraint and spectrum aggregation, the induction effect can be enhanced, and simultaneously, the hemispherical space constraint is used, so that the compression efficiency of plasma can be improved, and a better plasma spectrum enhancement effect is obtained.

3. According to the application, the joint of the base and the cavity is sealed, so that the leakage condition of high-temperature inert gas can be reduced; meanwhile, real-time detection is carried out by detection, so that when leakage occurs, remediation can be carried out, and the influence of detection is reduced.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a longitudinal cross-sectional view of an embodiment of the present application.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Reference numerals in the drawings of the specification include: the device comprises a base 1, a cavity 2, a cylinder 3, a first quartz window 4, a second quartz window 5, a third quartz window 6, a laser 7, a first focusing lens 8, a second focusing lens 9, a third focusing lens 10, a fiber probe 11, a spectrometer 12, a reflecting mirror 13, an air inlet pipe 14, an air outlet pipe 15, a placing cavity 16, a driving plate 17, a sealing layer 18, a communicating vessel 19, a sliding plate 20, a push rod 21, a leakage-proof plate 22, a leakage-proof layer 23, an expansion air bag 24, a control analysis system 25 and a sample stage 26.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "longitudinal," "transverse," "vertical," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the application.

In the description of the present application, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

The application provides a device for enhancing laser-induced plasma, which is shown in figure 1 and comprises a frame body, a base 1 and a cavity 2, wherein the base 1 and the cavity 2 are arranged on the frame body, the cavity 2 is fixed on the frame body, and the base 1 is vertically and slidably connected on the frame body. The bottom of the frame body is fixed with the cylinder 3, and the push rod of the cylinder 3 is fixed with the bottom of the base 1, so that the base 1 can be driven to vertically move.

The cavity 2 is rectangular, the inside of the cavity 2 is hemispherical, and the cavity 2 is an aluminum alloy cavity 2 made of aluminum alloy.

Openings are formed in the top, right side wall and rear side wall of the cavity 2, a first quartz window 4 is arranged on the opening in the top of the cavity 2, a second quartz window 5 is arranged on the opening in the right side wall of the cavity 2, and a third quartz window 6 is arranged on the opening in the rear side wall of the cavity 2. The laser 7 is arranged above the first quartz window 4 on the frame body, and the first focusing lens 8 is arranged below the first quartz window 4 in the cavity 2. The left side that is located second quartz window 5 in cavity 2 is provided with second focusing lens 9, is provided with fiber probe 11 on the right side that is located second quartz window 5 on the support body, is connected with spectrometer 12 on the fiber probe 11. The frame body is also provided with a laser 7 positioned at the rear side of the third quartz window 6, and a third focusing lens 10 is arranged at the front side of the third quartz window 6 in the cavity 2. The left side inside the cavity 2 is provided with two vertically overlapping mirrors 13.

The left side lower part of cavity 2 is provided with intake pipe 14, and right side upper portion is provided with outlet duct 15, intake pipe 14 and outlet duct 15 all communicate with cavity 2, and are provided with the valve on intake pipe 14 and the outlet duct 15.

A sample table 26 is fixed in the middle of the upper surface of the base 1, and the sample table 26 is positioned below the first quartz window 4; the sample stage 26 is located between the first focusing lens 8, the second focusing lens 9 and the third focusing lens 10. The upper surface of the base 1 is provided with a placing cavity 16 at the periphery of the sample table 26, and the bottom of the cavity 2 is positioned in the placing cavity 16.

As shown in fig. 2, a driving plate 17 is vertically and slidably connected in the placement cavity 16, and a sealing layer 18 is disposed on the upper surface of the driving plate 17. Four communicating vessels 19 are also included, the communicating vessels 19 being located at four sides of the cavity 2, respectively. One end of the communicating vessel 19 is arranged upward, and the other end of the communicating vessel 19 is arranged toward the cavity 2. Sliding plates 20 are slidably connected in the two ends of the communicating vessel 19, and communicating liquid is filled between the two sliding plates 20 in the communicating vessel 19. Push rods 21 are fixed on two sliding plates 20 in the communicating vessel 19, the push rods 21 in one end which is arranged upwards are fixed with the bottoms of the driving rods, leakage-preventing plates 22 are fixed on the push rods 21 of the other end, the four leakage-preventing plates 22 are respectively arranged in parallel with four side walls of the cavity 2, and the lengths of the four leakage-preventing plates are respectively consistent with the lengths of the corresponding side walls of the cavity 2.

The side of the leakage preventing plate 22 close to the cavity 2 is provided with a leakage preventing layer 23, and in this embodiment, the sealing layer 18 and the leakage preventing layer 23 are rubber layers. An inflatable airbag 24 is arranged between the leakage-proof plate 22 and the leakage-proof layer 23, and an air pump is further included, and four communicating pipes are arranged on the air pump and are respectively communicated with the four inflatable airbags 24. The four communicating pipes are provided with control valves.

The top of the leakage-proof plate 22 is uniformly provided with a plurality of detection probes along the length direction, and the number of the detection probes is set according to actual demands, and four detection probes are provided in this embodiment. The device also comprises an inert gas detector, wherein the inert gas detector is electrically connected with the detection probe. The detection probes and the inert gas detector are all existing equipment, and are not shown in the figure.

The control analysis system 25 is further included, and in this embodiment, a computer is used as the control analysis system 25, and the computer is electrically connected with the laser 7, the spectrometer 12, the inert gas detector and the air pump, and can control the opening and closing of the laser 7, analyze the spectrum collected by the optical fiber probe 11, and control the opening and closing of the air pump and the control valve according to the detection result of the inert gas detector.

The specific implementation process is as follows:

the sample to be measured is placed on the sample table 26, the air cylinder 3 is started, the air cylinder 3 drives the base 1 to move upwards until the cavity 2 is positioned in the placing cavity 16 on the base 1, the driving plate 17 is tightly attached to the bottom of the placing cavity 16, at the moment, the bottom of the cavity 2 is tightly attached to the sealing layer 18 on the upper surface of the driving plate 17, and a hemispherical cavity is formed inside the cavity 2.

In the process, the driving plate 17 moves downwards relative to the placing cavity 16, the push rod 21 is extruded, and under the action of the communicating vessel 19, the other push rod 21 drives the leakage-proof plate 22 to move towards the cavity 2 and cling to the outer side of the cavity 2, so that the sealing effect of the cavity 2 is improved.

And then the air inlet pipe 14 and the air outlet pipe 15 are opened, high-temperature inert gas is led into the cavity 2 through the air inlet pipe 14, the high-temperature inert gas extrudes air in the cavity 2, and the air is discharged through the air outlet pipe 15, so that the cavity 2 is filled with the high-temperature inert gas, and the influence of ions in the air on the signal intensity of plasma can be reduced. And then closing the valves on the air inlet pipe 14 and the air outlet pipe 15.

The laser 7 is controlled to emit laser through the control analysis system 25, the laser light is regulated and focused through the first focusing lens 8 and the third focusing lens 10, so that the laser light irradiates a sample to be detected, ion bodies are generated, the second focusing lens 9 focuses on the plasma spectrum, the optical fiber probe 11 is used for collecting data, the data are transmitted to the spectrometer 12, and after signal conversion is carried out through the spectrum, the data are transmitted to the control analysis system 25 for analysis processing, so that a result is obtained.

When the detection is carried out before preparation or in the detection process, if the high-temperature inert gas in the cavity 2 leaks, the detection can be carried out through the detection probe, signals are transmitted to the control analysis system 25, the control analysis system 25 controls the opening of the air pump and the control valve, and gas is introduced into the expansion air bag 24, so that the expansion air bag 24 is expanded, the anti-leakage layer 23 is driven to move and cling to the outer wall of the cavity 2, and the sealing effect is improved.

According to the application, the laser-induced plasma is enhanced by the synchronous action of space constraint and laser aggregation, so that the detection effect and stability can be improved.

In the description of the present specification, reference to the terms "preferred implementation," "one embodiment," "some embodiments," "example," "a particular example" or "some examples" and the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a device of reinforcing laser induction plasma, includes the support body, is provided with base and cavity on the support body, and the bottom of cavity pastes with the top of base mutually, and the cavity top is equipped with first quartz window, and the lateral wall of cavity is equipped with the second quartz window, and first quartz window top is equipped with the laser instrument, and second quartz window department is provided with fiber probe, and fiber probe is connected with the spectrum appearance, is provided with sample platform on the base, its characterized in that: a first focusing lens is arranged above the sample table in the cavity, and a second focusing lens is arranged between the sample table and the opening of the side wall on the cavity; a third quartz window is arranged on the other side wall of the cavity, a laser is also arranged outside the third quartz window, and a third focusing lens is arranged between the third quartz window and the sample table;

the system also comprises a control analysis system, wherein the control analysis system is electrically connected with the laser and the optical fiber probe.

2. The apparatus for enhancing a laser-induced plasma according to claim 1, wherein: and reflectors are arranged on the upper side and the lower side of one side, opposite to the second quartz window, of the cavity.

3. The apparatus for enhancing a laser-induced plasma according to claim 2, wherein: the interior of the cavity is hemispherical.

4. A device for enhancing a laser-induced plasma according to claim 3, wherein: the cavity is communicated with an air inlet pipe and an air outlet pipe, the air inlet pipe is positioned at the lower part, the air outlet pipe is positioned at the upper part, and valves are arranged in the air inlet pipe and the air outlet pipe.

5. The apparatus for enhancing a laser-induced plasma of claim 4 wherein: the base is vertically connected with the frame in a sliding way, the cavity is fixed on the frame, the bottom of the frame is fixed with a cylinder, and the push rod of the cylinder is fixed with the bottom of the base.

6. The apparatus for enhancing a laser-induced plasma of claim 5 wherein: the base is provided with a placing cavity, and the bottom of the cavity is positioned in the placing cavity; the inner vertical sliding connection of the placing cavity is provided with a driving plate, four communicating vessels are embedded in the base, the two ends of each communicating vessel are internally and slidably connected with sliding plates, and push rods are fixed on the sliding plates; one end of the communicating vessel faces upwards, the other end of the communicating vessel faces towards the four side walls of the cavity respectively, the push rod in the upward end is fixed with the driving plate, the push rod at the other end is fixed with a leakage-proof plate, and one side of the leakage-proof plate, which is close to the cavity, is provided with a leakage-proof layer.

7. The apparatus for enhancing a laser-induced plasma of claim 6 wherein: the top of the leakage-proof plate is provided with a plurality of detection probes for detecting inert gas, and the leakage-proof plate further comprises an inert gas detector, wherein the detection probes are electrically connected with the inert gas detector; an expansion air bag is arranged between the leakage-proof plate and the leakage-proof layer, and an air pump is communicated with the expansion air bag.

8. The apparatus for enhancing a laser-induced plasma of claim 7 wherein: the cavity is an aluminum alloy cavity.