Pulse laser-induced breakdown spectroscopy breakdown point automatic correction device

Abstract

This invention relates to an automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum. It solves the problem of misalignment in laser-induced breakdown spectra and poor performance in existing technologies. It includes a detection stage, a vertically arranged pulsed laser lamp group that can be moved arbitrarily on top of the detection stage, and symmetrically arranged sample tray positioning mechanisms slidingly on the upper surface of the detection stage. A telescopic positioning component is located at one end of the sample tray positioning mechanism, opposite to the detection stage. The telescopic positioning component is electrically connected to a control module, and the control module is electrically connected to an infrared pointing structure vertically arranged on the sample tray positioning mechanism. A sample tray assembly for placing samples is plugged into the sample tray positioning mechanism. The advantages of this invention are: effectively improved breakdown accuracy and good practical performance.

Description

Technical Field

[0001] This invention relates to the field of laser spectroscopy technology, and more specifically to an automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum. Background Technology

[0002] Laser-induced breakdown spectroscopy (LASPS) is an atomic emission spectrometry method that uses laser-generated plasma as an atomizer and atomic excitation source. The basic process of LASPS measurement involves projecting a pulsed laser onto the target sample, ablating it to form a plasma. The emission from this plasma is collected using optical elements such as lenses, and elemental composition or concentration information is obtained from spectral analysis. Qualitative or quantitative elemental analysis is performed based on the position and intensity of the emission lines. Laser-induced plasma plays a central role in LASPS; since the formation of the plasma is a result of the breakdown of the medium by the laser electric field, it is called laser-induced breakdown spectroscopy.

[0003] Traditional laser-induced breakdown spectroscopy (LAS) uses a single nanosecond laser beam focused into the air to form a breakdown spectrum. However, as the focal length of the focusing lens increases, i.e., the distance to the breakdown point increases, the laser intensity at the focal point decreases until it can no longer form plasma in the air, affecting the breakdown effect. In addition, when the laser performs targeted breakdown on the target sample, misalignment often occurs, resulting in poor performance and easily affecting the detection results.

[0004] To address the shortcomings of existing technologies, researchers have conducted long-term research and proposed various solutions. For example, Chinese patent literature discloses a device and method for increasing the breakdown point distance of laser-induced air breakdown [CN201610524102.2]. This method involves first combining a femtosecond laser pulse and a nanosecond laser pulse using a beam combiner. By adjusting the delay between the two beams, the femtosecond laser precedes the nanosecond laser by a certain time. A concave mirror then focuses the two beams into the air to induce breakdown. This method differs from conventional laser-induced breakdown in that the first femtosecond laser beam is pre-focused, creating pre-ionization in the air. The generated electrons lower the breakdown threshold of the nanosecond laser in the air, resulting in a longer breakdown point distance than traditional methods. This longer breakdown point distance lays the foundation for the development of long-range atmospheric detection technology.

[0005] The above-mentioned solution has solved the problem to some extent that the increase in breakdown distance in laser-induced breakdown spectroscopy can easily affect the breakdown effect in the existing technology. However, the solution still has many shortcomings. For example, when laser-induced breakdown is performed on the target sample, misalignment often occurs, resulting in poor performance and easy to affect the detection results. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed and effective automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum.

[0007] To achieve the above objectives, the present invention employs the following technical solution: This pulsed laser-induced breakdown spectrum automatic correction device for breakdown points includes a detection stage, a vertically arranged pulsed laser lamp assembly that can be moved arbitrarily above the detection stage, a symmetrically arranged sample tray positioning mechanism that slides on the upper surface of the detection stage, and a telescopic positioning component located at one end of the sample tray positioning mechanism on one side of the detection stage. The telescopic positioning component is electrically connected to a control module, and the control module is electrically connected to an infrared pointing structure vertically arranged on the sample tray positioning mechanism. A sample tray assembly for placing samples is plugged into the sample tray positioning mechanism. The sample tray positioning mechanism automatically locks and positions the sample tray assembly, and the infrared pointing structure automatically points the sample on the sample tray assembly. The pulsed laser lamp assembly uses the pointing intersection of the infrared pointing structure to perform point correction of the breakdown point, effectively preventing misalignment caused by direct pulsed laser light, resulting in good performance.

[0008] In the aforementioned automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum, the bottom of the sample tray assembly has an illumination source, and the sample tray assembly end face is a transparent structure. Furthermore, the mounting frame for installing the pulsed laser lamp assembly is equipped with a photosensitive element for sensing the light source. This photosensitive element is connected to the display screen via a control module. The photosensitive element allows the infrared pointing structure to accurately point to the sample tray frame assembly position that is obscured by the sample, improving pointing accuracy.

[0009] In the aforementioned automatic pulsed laser-induced breakdown spectroscopy breakdown point correction device, the sample tray positioning mechanisms are arranged opposite each other, forming an insertion space for the sample tray assembly to be inserted. A push-button start switch is located on the side of the telescopic positioning component facing the insertion space. This push-button start switch is connected to a power supply via a control module, and the power supply is connected to a sliding drive motor located at the bottom of the sample tray positioning mechanism, capable of driving the mechanism to move axially along the detection stage. This arrangement enables the sample tray positioning mechanism to automatically position and clamp the sample tray assembly, maintaining sample stability.

[0010] In the aforementioned pulsed laser-induced breakdown spectrum automatic correction device, the sample tray positioning mechanism includes a sliding plate with a movable slider at the bottom. The movable slider is mounted on guide rails on both sides of the detection stage. The ends of the sliding plates that are far apart from each other are connected to the aforementioned sliding drive motor, which is fixed externally and electrically connected to the control module. The opposite ends of the sliding plates are provided with a sliding insertion structure, and the end of the sliding insertion structure near the telescopic positioning component is provided with a fixed connection part. The two ends of the telescopic positioning component are respectively fixedly mounted on the corresponding fixed connection parts.

[0011] In the aforementioned automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum, the sliding insertion structure includes a fixed slot at the end of the sliding horizontal plate. The end of the fixed slot away from the telescopic positioning component is open, while the other end is closed via the aforementioned fixed connection. The inner wall of the fixed slot has a locking groove, the length of which is less than the length of the fixed slot. The upper surface of the end of the sliding horizontal plate away from the fixed slot has a mounting hole for fixing the infrared pointing structure end. This design facilitates automatic locking after the sample tray assembly is inserted, improving the positioning effect.

[0012] In the aforementioned automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum, the infrared pointing structure includes a mounting post. The upper end of the mounting post is connected to a rotation adjustment unit via a rotation drive motor. The end of the rotation adjustment unit away from the mounting post has a rotation mounting slot. An infrared lamp holder with an infrared lamp assembly is rotatably connected within the rotation mounting slot. A pointing angle adjustment motor, capable of driving the infrared lamp holder to rotate circumferentially within the rotation mounting slot, is fixedly mounted on the outer wall of the rotation mounting slot. The output shaft of the pointing angle adjustment motor passes through the infrared lamp holder, and its end is located within the rotation bearing of the rotation adjustment unit. This infrared pointing structure allows for flexible adjustment of the pointing angle of the infrared lamp assembly, covering the area of ​​the sample disk assembly.

[0013] In the aforementioned pulsed laser-induced breakdown spectrum breakdown point automatic correction device, the sample disk assembly includes a sample placement disk body, which has insertion parts on both sides and a sample placement area on the inner circumferential side. The insertion parts are provided with insertion locking parts corresponding to locking grooves, and the inner wall of the insertion parts is provided with a telescopic cavity. A top pressure spring connected to one side of the insertion locking part is provided in the telescopic cavity.

[0014] In the aforementioned pulsed laser-induced breakdown spectrum breakdown point automatic correction device, a top pressure protrusion is provided on the side of the sample placement plate near the telescopic positioning component, and a disassembly handle is provided on the side of the sample placement plate away from the telescopic positioning component. The insertion part is slidably inserted into the fixed slot, and the depth of the fixed slot is less than the width of the top pressure protrusion.

[0015] In the aforementioned automatic correction device for breakdown points in pulsed laser-induced breakdown spectroscopy, the telescopic positioning assembly includes L-shaped positioning blocks that are fixedly connected to corresponding fixed connecting parts. The positioning blocks are connected by several telescopic blocks, and fixed insertion blocks are provided between the telescopic blocks. The bottom of each fixed insertion block is fixedly mounted on the detection stage, and a push-button start switch is located on one side of the fixed insertion block. The telescopic positioning assembly can flexibly adapt to sample placement trays of different sizes.

[0016] In the aforementioned automatic correction device for the breakdown point of pulsed laser-induced breakdown spectrum, the assembly frame is L-shaped and slidably mounted on one side of the detection stage. The upper end of the assembly frame extends horizontally upwards towards the detection stage to form a horizontal mounting section. The pulsed laser lamp assembly and photosensitive element are located below the horizontal mounting section. One side of the detection stage has a sliding adjustment groove, and the bottom of the assembly frame is mounted within the sliding adjustment groove via a position adjustment shaft that passes through it. One end of the position adjustment shaft is connected to an external telescopic cylinder. This configuration allows for flexible adjustment of the lateral position of the pulsed laser lamp assembly according to the specifications of the sample placement tray.

[0017] Compared with existing technologies, the advantages of this invention are: simple design, convenient operation and high degree of automation. When one end of the sample placement tray is pressed against the push-button start switch located on the fixed plug block, the sample tray positioning mechanism locks both sides of the sample placement tray. The sample position on the upper surface of the sample placement tray is detected by the photosensitive element. Since the sample blocks the light source, the position where the light source is not detected is regarded as the sample position. The position of the infrared lamp holder is adjusted by the control module so that the infrared lamp groups in different positions point to the corresponding sample positions. The intersection of the infrared light emitted by the infrared lamp groups on the sample is regarded as the corrected breakdown position. At this time, the control module controls the pulse laser lamp group to move above the breakdown position to break down the sample, which can effectively correct the breakdown point and has good performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the sliding cross plate structure in this invention;

[0021] Figure 4 This is a schematic diagram of the sample tray assembly structure in this invention;

[0022] Figure 5 This is a schematic diagram of the infrared pointing structure in this invention;

[0023] Figure 6This is a schematic diagram of the detection platform structure in this invention;

[0024] Figure 7 This is a schematic diagram of the telescopic positioning component structure in this invention;

[0025] Figure 8 This is a partial structural connection diagram of the present invention.

[0026] In the figure, the components are: 1. Detection platform; 11. Sliding adjustment groove; 12. Position adjustment shaft; 2. Sample tray positioning mechanism; 21. Insertion space; 22. Sliding horizontal plate; 23. Moving slider; 24. Guide rail; 25. Mounting hole; 3. Telescopic positioning assembly; 31. Press-type start switch; 32. Positioning block; 33. Telescopic block; 34. Fixed insertion block; 4. Control module; 41. Display screen; 42. Power supply; 5. Infrared pointing structure; 51. Mounting hole post; 52. Rotation drive motor; 53. Rotation adjustment part; 54. Rotation mounting through groove. 54. Infrared lamp holder; 55. Infrared lamp assembly; 56. Pointing angle adjustment motor; 57. Rotary bearing; 58. Sample tray assembly; 6. Sample placement tray body; 61. Insertion part; 62. Sample placement area; 63. Insertion locking part; 64. Telescopic cavity; 65. Top pressure spring; 66. Top pressure protrusion; 67. Disassembly handle; 68. Assembly frame; 7. Pulsed laser lamp; 71. Photosensitive element; 72. Horizontal mounting part; 73. Sliding drive motor; 8. Sliding insertion structure; 9. Fixed connection part; 91. Fixed slot; 92. Locking groove; 93. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-8 As shown, this pulsed laser-induced breakdown spectrum automatic correction device includes a detection stage 1. A vertically positioned, movable pulsed laser lamp group 71 is mounted on top of the detection stage 1. A symmetrically arranged sample tray positioning mechanism 2 is slidably mounted on the upper surface of the detection stage 1. A telescopic positioning component 3 is located at one end of the sample tray positioning mechanism 2, opposite to the detection stage 1. The telescopic positioning component 3 is electrically connected to a control module 4, and the control module 4 is electrically connected to an infrared pointing structure 5 vertically mounted on the sample tray positioning mechanism 2. A sample tray assembly 6 for placing samples is inserted and connected between the sample tray positioning mechanisms 2. A photosensitive area is formed on the upper surface of the sample tray assembly 6. When a sample is placed on the sample tray assembly 6, the photosensitive area is blocked, thus determining the initial breakdown position. The sample tray positioning mechanism 2 can automatically adjust to press the two sides of the sample tray assembly 6 according to its specifications. When the sample tray positioning mechanism 2 moves, the infrared pointing structure 5 moves synchronously, maintaining the coverage area of ​​the correction position.

[0029] The sample tray assembly 6 has an illumination source at its bottom end face, and the end face of the sample tray assembly 6 is a transparent structure. The mounting frame 7 for mounting the pulsed laser lamp assembly 71 is equipped with a photosensitive element 72 for sensing the light source. The photosensitive element 72 is connected to the display screen 41 via the control module 4. The sample position can be observed in real time through the display screen 41, thereby determining whether the pointing intersection position of the infrared pointing structure 5 is accurate. The laser bandwidth of the pulsed laser lamp assembly 71 can be adjusted via external equipment.

[0030] As can be seen, the sample tray positioning mechanism 2 is positioned opposite each other, forming an insertion space 21 for inserting the sample tray assembly 6. A push-button start switch 31 is provided on the side of the telescopic positioning component 3 facing the insertion space 21. The push-button start switch 31 is connected to the power supply 42 via the control module 4. The power supply 42 is connected to a sliding drive motor 8 located at the bottom of the sample tray positioning mechanism 2 and capable of driving the sample tray positioning mechanism 2 to move axially along the detection stage 1. When the push-button start switch 31 is subjected to pressure, the control module 4 connects the sample tray positioning mechanism 2 to the power supply 42, and the sample tray positioning mechanism 2 begins to move to lock the sample tray assembly 6.

[0031] Obviously, the sample tray positioning mechanism 2 includes a sliding plate 22, with a movable slider 23 at the bottom of the sliding plate 22. The movable slider 23 is mounted on guide rails 24 on both sides of the detection platform 1. The ends of the sliding plates 22 that are far apart from each other are connected to the aforementioned sliding drive motor 8, which is fixed externally and electrically connected to the control module 4. The opposite ends of the sliding plates 22 are provided with a sliding insertion structure 9, and the end of the sliding insertion structure 9 near the telescopic positioning component 3 is provided with a fixed connection part 91. The two ends of the telescopic positioning component 3 are respectively fixedly mounted on the corresponding fixed connection parts 91. The distance between the movable sliders 23 can be flexibly adjusted and fixed according to the width of the sample placement tray 61. In use, the sample placement tray 61 can be inserted and locked first, or the sample placement tray 61 can be placed directly into the sample placement area 63 and the press-type start switch 31 can be pressed to make the movable sliders 23 slide and lock the sides of the sample placement tray 61.

[0032] Furthermore, the sliding insertion structure 9 includes a fixing slot 92 disposed at the end of the sliding horizontal plate 22. The end of the fixing slot 92 away from the telescopic positioning component 3 is open, and the other end is closed through the aforementioned fixing connection part 91. The inner wall of the fixing slot 92 is provided with a locking groove 93, and the length of the locking groove 93 is less than the length of the fixing slot 92. The upper surface of the end of the sliding horizontal plate 22 away from the fixing slot 92 is provided with a mounting hole 25 for fixing and installing the end of the infrared pointing structure 5.

[0033] Specifically, the infrared pointing structure 5 includes a mounting post 51. A rotation adjustment part 53 is connected to the upper end of the mounting post 51 via a rotation drive motor 52. The end of the rotation adjustment part 53 away from the mounting post 51 has a rotation mounting slot 54. An infrared lamp holder 55 with an infrared lamp assembly 56 is rotatably connected within the rotation mounting slot 54. A pointing angle adjustment motor 57, capable of driving the infrared lamp holder 55 to rotate circumferentially within the rotation mounting slot 54, is fixedly mounted on the outer wall of the rotation mounting slot 54. The output shaft of the pointing angle adjustment motor 57 passes through the infrared lamp holder 55, and its end is located within a rotation bearing 58 of the rotation adjustment part 53. Using the rotation drive motor 52 and the pointing angle adjustment motor 57, the angle of the infrared lamp holder 55 can be flexibly adjusted to cover a sample placement area 63 of any size, and the pointing point of the infrared lamp assembly 56 can be adjusted to a fixed point according to external equipment.

[0034] Furthermore, the sample tray assembly 6 includes a sample placement tray body 61. The sample placement tray body 61 has insertion portions 62 on both sides and a sample placement area 63 on its inner circumferential side. The insertion portions 62 are provided with insertion locking portions 64 corresponding to locking grooves 93, and the inner wall of the insertion portions 62 is provided with a telescopic cavity 65. A top-pressure spring 66 connected to one side of the insertion locking portion 64 is located within the telescopic cavity 65. The sample placement area 63 is a photosensitive area. When a sample is placed in the photosensitive area, the photosensitive element performs detection. The obstructed area is considered the initial breakdown area. The sample placed on the sample placement tray body 61 here is a laboratory test sample, which is relatively small.

[0035] More specifically, the sample placement tray 61 has a top pressing protrusion 67 on the side near the telescopic positioning component 3, and a disassembly handle 68 on the side away from the telescopic positioning component 3. The insertion part 62 is slidably inserted into the fixing slot 92, and the depth of the fixing slot 92 is less than the width of the top pressing protrusion 67.

[0036] In detail, the telescopic positioning assembly 3 includes positioning blocks 32 arranged in an L-shape and fixedly connected to corresponding fixed connecting parts 91. The positioning blocks 32 are connected by several telescopic blocks 33, and fixed insertion blocks 34 are provided between the telescopic blocks 33. The bottom of the fixed insertion blocks 34 is fixedly mounted on the detection stage 1, and a push-button start switch 31 is located on one side of the fixed insertion blocks 34. The telescopic positioning assembly 3 allows the width of the insertion space 21 to be pre-adjusted according to the size of the sample placement tray 61.

[0037] Preferably, the assembly frame 7 is L-shaped and slidably mounted on one side of the testing platform 1. The upper end of the assembly frame 7 extends horizontally upward toward the testing platform 1 to form a horizontal mounting portion 73. The pulsed laser lamp assembly 71 and the photosensitive element 72 are mounted on the lower side of the horizontal mounting portion 73. One side of the testing platform 1 has a sliding adjustment groove 11, and the bottom of the assembly frame 7 is mounted in the sliding adjustment groove 11 via a position adjustment shaft 12 passing through the sliding adjustment groove 11. One end of the position adjustment shaft 12 is connected to an external telescopic cylinder. This arrangement facilitates the lateral position adjustment of the pulsed laser lamp assembly 71, and the horizontal mounting portion 73 is equipped with a longitudinal adjustment cylinder capable of longitudinally adjusting the pulsed laser lamp assembly 71.

[0038] In summary, the principle of this embodiment is as follows: During use, the insertion space 21 between the sliding cross plates 22 is pre-adjusted according to the width of the sample placement tray 61. After the adjustment is completed, the sample placement tray 61 is inserted into the fixing slot 92 and the plug-in locking part 64 is inserted into the locking groove 93 to achieve the final fixation of the sample placement tray 61. After positioning, the corresponding test sample is placed in, and the light is detected by the photosensitive element 72. The position where the photosensitive area is blocked by the test sample is regarded as the initial breakdown position. At this time, the pointing angle of the infrared pointing structure 5 is adjusted by the control module 4, and the pointing point is simultaneously pointed to the breakdown point position of the test sample. The intersection of the pointing positions of different infrared lamp groups 56 is determined as the final breakdown position. The final breakdown position can be observed in real time through the display screen 41 to see if there is a deviation between the final breakdown position and the marked breakdown position of the test sample. If there is a deviation, the pointing direction of the infrared lamp group 56 is adjusted by the external control device.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0040] Although this paper extensively uses the following components: detection platform 1, sliding adjustment groove 11, position adjustment shaft 12, sample tray positioning mechanism 2, insertion space 21, sliding cross plate 22, moving slider 23, guide rail 24, mounting hole 25, telescopic positioning assembly 3, push-button start switch 31, positioning block 32, telescopic block 33, fixed insertion block 34, control module 4, display screen 41, power supply 42, infrared pointing structure 5, mounting hole post 51, rotation drive motor 52, rotation adjustment part 53, rotation mounting through groove 54, infrared lamp The terms used include 55, infrared lamp assembly 56, pointing angle adjustment motor 57, rotating bearing 58, sample tray assembly 6, sample placement tray body 61, insertion part 62, sample placement area 63, insertion locking part 64, telescopic cavity 65, top pressure spring 66, top pressure protrusion 67, disassembly handle 68, assembly frame 7, pulse laser lamp 71, photosensitive element 72, horizontal mounting part 73, sliding drive motor 8, sliding insertion structure 9, fixed connection part 91, fixed slot 92, locking groove 93, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. An automatic correction device for the breakdown point of a pulsed laser-induced breakdown spectrum, comprising a detection platform (1), wherein a pulsed laser lamp group (71) that can be moved arbitrarily and is vertically arranged is provided above the detection platform (1), characterized in that, The upper surface of the detection platform (1) is slidably provided with a symmetrically arranged sample tray positioning mechanism (2), and a telescopic positioning component (3) is provided at one end of the sample tray positioning mechanism (2) opposite to it and located on one side of the detection platform (1). The telescopic positioning component (3) is electrically connected to a control module (4), and the control module (4) is electrically connected to an infrared pointing structure (5) vertically arranged on the sample tray positioning mechanism (2). A sample tray assembly (6) for placing samples is plugged into the sample tray positioning mechanism (2). The bottom end face of the sample tray assembly (6) has an illumination source, and the end face of the sample tray assembly (6) is a transparent structure. A photosensitive element (72) for sensing the light source is provided on the assembly frame (7) for mounting the pulsed laser lamp group (71). The photosensitive element (72) The control module (4) is connected to the display screen (41); the infrared pointing structure (5) includes a mounting post (51), the upper end of the mounting post (51) is connected to a rotation adjustment part (53) via a rotation drive motor (52), and the end of the rotation adjustment part (53) away from the mounting post (51) has a rotation mounting slot (54). An infrared lamp holder (55) with an infrared lamp group (56) is rotatably connected in the rotation mounting slot (54), and a pointing angle adjustment motor (57) that can drive the infrared lamp holder (55) to rotate circumferentially in the rotation mounting slot (54) is fixed on the outer wall of the rotation mounting slot (54). The output shaft of the pointing angle adjustment motor (57) passes through the infrared lamp holder (55) and its end is set in the rotation bearing (58) of the rotation adjustment part (53).

2. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 1, characterized in that, The sample tray positioning mechanism (2) is arranged opposite to each other to form an insertion space (21) for the sample tray assembly (6) to be inserted. The telescopic positioning assembly (3) is provided with a push-button start switch (31) on the side facing the insertion space (21). The push-button start switch (31) is connected to the power supply (42) through the control module (4). The power supply (42) is connected to the sliding drive motor (8) located at the bottom of the sample tray positioning mechanism (2) and capable of driving the sample tray positioning mechanism (2) to move axially along the detection platform (1).

3. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 2, characterized in that, The sample tray positioning mechanism (2) includes a sliding plate (22), the bottom of which has a movable slider (23), and the movable slider (23) is set on the guide rails (24) on both sides of the detection platform (1). The ends of the sliding plates (22) that are far apart from each other are connected to the sliding drive motor (8) mentioned above, and the sliding drive motor (8) is fixed to the outside and electrically connected to the control module (4). The sliding plate (22) has a sliding plug-in structure (9) at one end that is opposite to each other, and the end of the sliding plug-in structure (9) near the telescopic positioning component (3) has a fixed connection part (91). The two ends of the telescopic positioning component (3) are respectively fixedly set on the corresponding fixed connection parts (91).

4. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 3, characterized in that, The sliding plug-in structure (9) includes a fixed slot (92) provided at the end of the sliding horizontal plate (22). The fixed slot (92) is open at one end away from the telescopic positioning component (3), and closed at the other end through the fixed connection part (91). The inner wall of the fixed slot (92) is provided with a locking groove (93), and the length of the locking groove (93) is less than the length of the fixed slot (92). The upper surface of the sliding horizontal plate (22) away from the fixed slot (92) is provided with a mounting hole (25) for fixing and installing the infrared pointing structure (5).

5. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 4, characterized in that, The sample tray assembly (6) includes a sample placement tray body (61), which has insertion parts (62) on both sides and a sample placement area (63) on the inner side of the circumference. The insertion parts (62) are provided with insertion locking parts (64) corresponding to the locking groove (93), and the inner wall of the insertion parts (62) is provided with a telescopic cavity (65). The telescopic cavity (65) is provided with a top pressure spring (66) connected to one side of the insertion locking part (64).

6. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 5, characterized in that, The sample placement tray (61) has a top pressure protrusion (67) on the side near the telescopic positioning component (3), and a disassembly handle (68) on the side away from the telescopic positioning component (3). The insertion part (62) is slidably inserted into the fixed slot (92), and the depth of the fixed slot (92) is less than the width of the top pressure protrusion (67).

7. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 6, characterized in that, The telescopic positioning component (3) includes positioning blocks (32) that are fixedly connected to the corresponding fixed connecting parts (91) and arranged in an L-shape. The positioning blocks (32) are connected by a number of telescopic blocks (33). The telescopic blocks (33) are connected by fixed plug-in blocks (34). The bottom of the fixed plug-in blocks (34) is fixedly mounted on the detection platform (1). The push-button start switch (31) is located on one side of the fixed plug-in blocks (34).

8. The automatic correction device for breakdown point in pulsed laser-induced breakdown spectrum according to claim 1, characterized in that, The assembly frame (7) is L-shaped and slidably disposed on one side of the testing platform (1). The upper end of the assembly frame (7) extends horizontally above the testing platform (1) to form a horizontal mounting part (73). The pulsed laser lamp group (71) and the photosensitive element (72) are disposed on the lower side of the horizontal mounting part (73). The testing platform (1) has a sliding adjustment groove (11) on one side. The bottom of the assembly frame (7) is disposed in the sliding adjustment groove (11) through a position adjustment shaft (12) that passes through the sliding adjustment groove (11). One end of the position adjustment shaft (12) is connected to an external telescopic cylinder.

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