Multi-sample fish-mouth-shaped sample bin for laser ablation

Abstract

The utility model discloses a multi-sample fish-mouth-shaped sample bin for laser ablation. The multi-sample fish-mouth-shaped sample bin comprises a shell, an air inlet end, an air outlet end and a laser window, the shell comprises an upper shell and a lower shell, the air inlet end and the air outlet end are arranged on two opposite sides of the upper shell, and the laser window is arranged on the upper shell; the lower shell comprises a sample support, a sample placing area is formed in the middle of the sample support, and the sample placing area comprises at least one round sample placing area and at least one long-strip-shaped sample placing area; the width of the sample bracket is gradually reduced from the rear end of the sample placing area to the air outlet end to form a fish mouth shape. According to the utility model, samples with different shapes can be simultaneously subjected to laser ablation, so that subsequent detection and analysis results can be simultaneously displayed on a mass spectrum and can be intuitively displayed, and the fish-mouth-shaped arrangement enables carrier gas and aerosol generated after laser ablation to reach a constant-speed state when gas is discharged, so that the detection and analysis efficiency is greatly improved. And the error of a subsequent detection analysis result is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser ablation, and in particular relates to a multi-sample fish-mouth type sample bin for laser ablation. Background Art

[0002] Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a solid direct sampling, in-situ, micro-area, elemental analysis technology. With the gradual maturity of laser ablation systems, LA-ICP-MS has been widely used in geology, environment, archaeology, materials and other fields. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) uses a laser to emit a laser beam, uses an objective lens to focus the laser on a specific area of ​​the sample, and uses the energy of the pulsed laser to directly ablate the solid sample into tiny particles, forming an aerosol with the carrier gas, and then the particles are plasmatized by an inductively coupled plasma source (ICP) and enter the mass spectrometer for element detection.

[0003] Therefore, during laser ablation, if the gas flow rate is too high or uneven during gas outlet, the error of the analysis result of the subsequent detection and analysis device will be larger. In addition, in the test scenario where laser ablation is required for samples of different shapes at the same time, it is necessary to replace the sample chamber that is suitable for samples of different shapes before laser ablation can be performed, which greatly increases the test time. In addition, replacing the sample chamber will also waste the carrier gas. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a multi-sample fish-mouth type sample chamber for laser ablation to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a multi-sample fish-mouth type sample chamber for laser ablation, comprising a shell, an air inlet end, an air outlet end and a laser window;

[0006] The housing comprises an upper housing and a lower housing, the air inlet and the air outlet are arranged on two opposite sides of the upper housing, and the laser window is arranged on the upper housing;

[0007] The lower shell includes a sample holder, a sample placement area is provided in the middle of the sample holder, the position of the sample placement area corresponds to the laser window, and the sample placement area includes at least one circular sample placement area and at least one long strip sample placement area;

[0008] The width of the sample holder from the rear end of the sample placement area to the air outlet end gradually decreases, forming a fish mouth shape.

[0009] Preferably, an air passage is provided between the upper shell and the sample holder.

[0010] Preferably, the laser window is provided with a step-shaped structure inside the upper shell.

[0011] Preferably, a chamfer is provided at the end of the fish mouth connected to the air outlet.

[0012] Preferably, a gas homogenization device is further included, and the gas homogenization device is arranged on a side close to the gas inlet end.

[0013] Preferably, the gas homogenizing device is a gas path homogenizing baffle.

[0014] Preferably, fixed sealing devices are arranged around the upper shell and the lower shell in corresponding positions.

[0015] The beneficial effects of the utility model are:

[0016] The multi-sample fish-mouth type sample bin of the utility model is suitable for samples of different shapes. Samples of different shapes can be laser ablated simultaneously, so that the subsequent detection and analysis results can be displayed on a mass spectrum at the same time, which is intuitive. The fish-mouth type setting allows the carrier gas and aerosol generated after laser ablation to reach a uniform speed state when exhausting, which greatly reduces the error of the subsequent detection and analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 to Figure 2 It is a schematic diagram of a multi-sample fish-mouth type sample chamber for laser ablation disclosed in the utility model;

[0019] Figures 3 to 5 This is a schematic diagram of the gas homogenization baffle disclosed in the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 to Figure 2As shown, a multi-sample fish-mouth type sample chamber for laser ablation disclosed in this embodiment includes a housing 10, an air inlet end 20, an air outlet end 30 and a laser window 111;

[0022] The housing includes an upper housing 11 and a lower housing 12, an air inlet 20 and an air outlet 30 are arranged on opposite sides of the upper housing 10, and a laser window 111 is arranged on the upper housing 11;

[0023] The lower shell 12 is provided with a sample holder 122, and a sample placement area 124 is opened in the middle of the sample holder 122. The position of the sample placement area 124 corresponds to the laser window 111. The sample placement area 124 is used to place samples. The sample placement area includes at least one circular sample placement area 1241 and at least one long strip sample placement area 1242. The width of the sample holder 122 from the rear end part of the sample placement area 124 to the air outlet end 30 gradually decreases, forming a fish mouth shape.

[0024] The multi-sample fish-mouth type sample chamber for laser ablation disclosed in this embodiment further includes a gas homogenizing device 121, which is a gas homogenizing baffle. Figures 3 to 5 As shown, the gas homogenizing baffle includes a top surface 1211, a bottom surface 1212, a first side surface 1213 and a second side surface 1214 opposite to each other; a first groove 1215 is formed on the first side surface 1213, and the first groove 1215 is in an inverted trapezoidal shape, and the width of the upper opening of the first groove 1215 is greater than the width of the lower opening thereof, the upper opening of the first groove 1215 faces and extends to the top surface 1211, and the lower opening of the first groove 1215 faces and extends to the bottom surface 1212; the second side surface 121 4 is provided with a second groove 1216, which is trapezoidal, the width of the upper end of the second groove 1216 is smaller than the width of the lower end opening thereof, the upper end of the second groove 1216 faces the top surface 40, the upper end of the second groove 1216 is closed, and the lower end opening of the second groove 1216 faces the bottom surface 1212; an air path 1217 is provided on the bottom surface 1212, and the lower end opening of the first groove 11 is in air communication with the lower end opening of the second groove 1216 through the air path 1217.

[0025] In actual application scenarios, the gas first enters from the upper end of the second groove 1216, passes through the second groove 1216 and enters the gas path 1217 from its lower end opening; because the upper end of the second groove 1216 is blocked, the gas can only flow out to the lower end opening of the second groove 1216, and the second groove 1216 is trapezoidal in design, with the upper end narrower than the lower end opening, so when the gas flows to the lower part of the second groove 1216, the gas flow rate will slow down, achieving the first gas homogenization effect. Then, the gas passes through the gas path 1217, bypasses the bottom surface 1212, enters the first groove 1215 from the lower end opening of the first groove 1215, passes through the first groove 1215 and enters the subsequent device from its upper end opening; the upper end opening of the first groove 1215 extends to the top surface 1211, and the gas can enter the subsequent device from the top surface 1211; the first groove 1215 is designed to be an inverted trapezoid, and the lower end opening of the first groove 1215 is narrower than the upper end opening, so when the gas flows to the upper part of the first groove 1215, the gas flow rate will slow down, achieving a second gas homogenization effect.

[0026] In some other embodiments, such as Figure 4 As shown, the second groove 1216 also includes a flange 1218, which is arranged above the gas path channel 1217. The flange 1218 is close to the lower end opening of the second groove 1216. The flange 1218 reduces the space for gas to enter the gas path channel 31, further reducing the gas flow rate and once again achieving a gas homogenization effect.

[0027] In actual application scenarios, the sample is placed in the sample placement area 124, and the carrier gas enters from the air inlet 20, and flows to the air outlet 30 after completing the gas homogenization effect through the gas homogenization device 121; in this process, the laser is emitted to the sample placement area 124 through the laser window 111, and aerosol is generated after the sample is eroded. The carrier gas after the gas homogenization effect will flow to the air outlet 30 with the aerosol, and because the part from the rear end of the sample holder 122 to the air outlet 30 is arranged in a fish-mouth shape, the carrier gas flow rate is gradually slowing down, so that the gas finally flowing out of the air outlet 30 reaches a uniform speed effect, which greatly reduces the error of the analysis result when the subsequent device performs detection and analysis.

[0028] In this embodiment, if Figure 3As shown, a stepped structure 112 is provided inside the upper shell 11, and the stepped structure 112 is located at the edge of the laser window 111. Because the air inlet 20 of this embodiment is provided at the upper shell 11, the top of the gas homogenization device 121 must be higher than the top of the sample holder 122, and the top of the gas homogenization device 121 must abut against the inside of the upper shell 11, so that the gas can bypass the bottom of the gas homogenization device 121 after entering from the air inlet 20, and finally flow out from the upper end opening of the gas outlet end 1212 of the homogenization baffle, and then enter the sample placement area 124. When the upper shell 11 and the lower shell 12 are fixed and sealed, a gas path will be left between the laser window 111 and the sample holder 122 for the carrier gas to pass through. The use of the stepped structure 112 can further increase the space for gas flow in the gas path, further reduce the flow rate of the gas, and once again achieve the gas homogenization effect.

[0029] In this embodiment, fixed sealing devices 13 are arranged around the upper shell 11 and the lower shell 12 at corresponding positions, so that the upper shell 11 and the lower shell 12 are fixedly connected by screws, thereby further enhancing the sealing performance of the shell.

[0030] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-sample fish-mouth sample chamber for laser ablation, characterized in that: It includes a shell, an air inlet end, an air outlet end and a laser window; The housing comprises an upper housing and a lower housing, the air inlet and the air outlet are arranged on two opposite sides of the upper housing, and the laser window is arranged on the upper housing; The lower shell includes a sample holder, a sample placement area is provided in the middle of the sample holder, the position of the sample placement area corresponds to the laser window, and the sample placement area includes at least one circular sample placement area and at least one long strip sample placement area; The width of the sample holder from the rear end of the sample placement area to the air outlet end gradually decreases, forming a fish mouth shape.

2. The multi-sample fish-mouth type sample chamber according to claim 1, characterized in that: An air passage is arranged between the upper shell and the sample holder.

3. The multi-sample fish-mouth type sample chamber according to claim 2, characterized in that: The laser window is provided with a step-shaped structure inside the upper shell.

4. The multi-sample fish-mouth type sample chamber according to claim 1, characterized in that: It also includes a gas homogenizing device, which is arranged on a side close to the gas inlet end.

5. The multi-sample fish-mouth type sample chamber according to claim 4, characterized in that: The gas homogenizing device is a gas path homogenizing baffle.

6. The multi-sample fish-mouth type sample chamber according to claim 5, characterized in that: comprising a top surface, a bottom surface, and opposite first and second side surfaces; A first groove is formed on the first side surface, the first groove is in an inverted trapezoidal shape, the width of the upper opening of the first groove is greater than the width of the lower opening thereof, the upper opening of the first groove faces and extends to the top surface, and the lower opening of the first groove faces and extends to the bottom surface; A second groove is formed on the second side surface, the second groove is trapezoidal, the width of the upper end of the second groove is smaller than the width of the lower end opening thereof, the upper end of the second groove faces the top surface, and the lower end opening of the second groove faces and extends to the bottom surface; The bottom surface is provided with an air path passage, and the lower end opening of the first groove is in air communication with the lower end opening of the second groove through the air path passage.

7. The multi-sample fish-mouth type sample chamber according to claim 6, characterized in that: The second groove further comprises a flange, which is arranged above the air passage and close to the lower end opening of the second groove.

8. The multi-sample fish-mouth type sample chamber according to claim 1, characterized in that: The upper shell and the lower shell are provided with corresponding fixed sealing devices around their peripheries.

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