Miniaturized fish-mouth-shaped sample bin for laser ablation

Abstract

The utility model discloses a miniaturized fish-mouth-shaped sample bin for laser ablation. The miniaturized 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 bracket, and the width of the sample bracket is gradually reduced from the position corresponding to the laser window to the air outlet end to form a fish mouth shape. The miniaturized fish-mouth-shaped sample bin is suitable for miniaturized samples, the problem that carrier gas is wasted due to the fact that a sample bin with a large volume is used is solved, and particles generated after laser ablation and aerosol formed by the carrier gas are fully and evenly mixed and reach a constant-speed state during gas discharging due to the fish-mouth-shaped arrangement. 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 miniaturized 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 discharge, the error of the analysis result of the subsequent detection and analysis device will become larger. Moreover, when the sample volume is small, using a larger sample chamber will waste carrier gas and also increase the error of the analysis result. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a miniaturized 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 miniaturized 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 housing comprises a sample holder, a sample placement area is provided in the middle of the sample holder, and the position of the sample placement area corresponds to the laser window;

[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 miniaturized fish-mouth sample chamber of the utility model is suitable for miniaturized samples, avoiding the problem of wasting carrier gas caused by using a larger sample chamber. The fish-mouth setting allows the aerosol formed by the particles produced after laser ablation and the carrier gas to be fully mixed and reach a uniform speed state when the gas is discharged, greatly reducing the error of 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] Figures 1 to 3 It is a schematic diagram of a miniaturized fish-mouth-shaped sample chamber for laser ablation disclosed in the utility model;

[0019] Figure 4 and Figure 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 Figures 1 to 3 As shown, a miniaturized fish-mouth 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 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 miniaturized fish-mouth sample chamber for laser ablation disclosed in this embodiment also includes a gas homogenizing device 121, which is a gas homogenizing baffle. The gas homogenizing baffle includes a homogenizing baffle inlet end 1211, a homogenizing baffle outlet end 1212 and a bottom gas channel 1213. Figure 4 As shown, the homogenizing baffle inlet end 1211 is a trapezoidal groove, that is, the upper end is narrower than the lower end opening, and the upper end corresponds to the position of the inlet end 20, but the top of the upper end is closed, that is, the gas flows from the upper end of the gas homogenizing device 121 to the lower end opening, and then flows to the homogenizing baffle outlet end 1212 through the bottom gas channel 1213; Figure 5 As shown, the outlet end 1212 of the gas homogenizing baffle is an inverted trapezoidal groove, that is, its lower opening is narrower than its upper opening, and the upper opening of the outlet end extends to its top surface, and the gas flows out from the upper opening after passing through the outlet end 1212 of the homogenizing baffle. The trapezoidal and inverted trapezoidal settings both make the space from the gas inflow to the gas outflow gradually larger, reduce the gas flow rate, and thus achieve a gas homogenization effect.

[0025] In the actual application scenario, 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 set 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. In a preferred embodiment, a chamfer 123 is set at the end of the fish-mouth shape of the sample holder 122, and the chamfer 123 enlarges the space before the gas enters the air outlet 30, further reduces the flow rate of the gas, and completes the gas homogenization effect again.

[0026] 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.

[0027] In this embodiment, the upper shell 11 and the lower shell 12 are provided with corresponding fixed sealing devices 13 around the upper shell 11 and the lower shell 12, so that the upper shell 11 and the lower shell 12 are fixedly connected by screws, and the sealing of the shell is further enhanced. In a preferred embodiment, the upper and lower ends of the fixed sealing device 13 do not exceed the surface of the upper shell 11 and the lower shell 12, so that the miniaturized fish-mouth type sample chamber can be used in a limited space.

[0028] 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.

[0029] 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 miniaturized 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 housing comprises a sample holder, a sample placement area is provided in the middle of the sample holder, and the position of the sample placement area corresponds to the laser window; 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 miniaturized fish-mouth sample chamber according to claim 1, characterized in that: An air passage is arranged between the upper shell and the sample holder.

3. The miniaturized fish-mouth 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 miniaturized fish-mouth sample chamber according to claim 1, characterized in that: A chamfer is arranged at the end of the fish mouth shape.

5. The miniaturized fish-mouth 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.

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

7. The miniaturized fish-mouth 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.

8. The miniaturized fish-mouth sample chamber according to claim 7, characterized in that: The upper and lower ends of the fixed sealing device will not exceed the surfaces of the upper shell and the lower shell.

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