LIBS (Laser-induced Breakdown Spectroscopy) dual-channel optical path and handheld LIBS spectrograph

Abstract

The utility model discloses an LIBS dual-channel optical path and a handheld LIBS spectrograph, the handheld LIBS spectrograph comprises a shell, the LIBS dual-channel optical path is arranged in the shell, the LIBS dual-channel optical path comprises a laser, a laser focusing optical path module, two LIBS signal collection modules and two spectrographs, the spectrographs are connected with the LIBS signal collection modules, the laser focusing optical path module is connected with the laser focusing optical path module, and the two spectrographs are connected with the laser focusing optical path module. And the shell is used for analyzing the LIBS signals transmitted by the LIBS signal collection module, the shell is provided with a diaphragm for the laser and the LIBS signals to pass through, the bottom of the shell is provided with a handle, and one end, deviating from the shell, of the handle is provided with a base. According to the utility model, the handheld detection is facilitated, the placement is also convenient, and data can be collected from two different angles by using two different spectral ranges, so that the analysis accuracy and comprehensiveness are improved, the chromatic aberration during LIBS signal collection can be reduced, the broadband LIBS signal collection efficiency is improved, and the detection accuracy is improved. The device is suitable for multi-element detection requirements of a to-be-detected sample, and efficient collection is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of spectrometers, in particular to a LIBS dual-channel optical path and a handheld LIBS spectrometer. Background Art

[0002] Because light of different wavelengths has different refractive indices when passing through a lens, it results in different focal positions (i.e., the focal point is at different distances from the lens; the shorter the wavelength, the closer the focal point is). This phenomenon is called chromatic aberration. Traditional handheld LIBS spectrometers use a simple single-lens, single-channel collection optical path, which introduces chromatic aberration when collecting LIBS signals (for example, in the 200-800nm ​​range, the focal point of the 200nm signal is significantly different from the focal point of the 800nm ​​signal). This results in low acquisition efficiency for wide-band LIBS signals. However, in actual production applications, LIBS spectrometers often require multi-element detection, and traditional handheld LIBS devices cannot achieve efficient acquisition for such requirements. Utility Model Content

[0003] To address the deficiencies in the prior art, the present invention provides a LIBS dual-channel optical path and a handheld LIBS spectrometer, which can simultaneously collect LIBS signals from two different angles and using two different spectral ranges to improve the accuracy and comprehensiveness of the analysis. This can also reduce chromatic aberration when collecting LIBS signals and improve the efficiency of wide-band LIBS signal acquisition. This is suitable for the multi-element detection requirements of the sample to be tested, achieving efficient acquisition.

[0004] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] A LIBS dual-channel optical path includes a laser, a laser focusing optical path module, a LIBS signal collection module, and a spectrometer. The laser is used to emit laser light; the laser focusing optical path module focuses the laser light emitted by the laser onto a sample to be tested to generate plasma and radiate a LIBS signal; two LIBS signal collection modules are provided, which are used to collect the LIBS signals radiated by the plasma and transmit them to the spectrometer; and two spectrometers are provided, respectively connected to the two LIBS signal collection modules, to analyze the LIBS signals transmitted by the LIBS signal collection modules.

[0006] A first reflector and a first plano-convex lens are sequentially arranged on the optical path of the laser focusing optical path module.

[0007] A second plano-convex lens and a third plano-convex lens are sequentially arranged on the optical path of one of the LIBS signal collection modules; a fourth plano-convex lens, a second reflector, and a fifth plano-convex lens are sequentially arranged on the optical path of the other LIBS signal collection module.

[0008] A handheld LIBS spectrometer includes a housing, a LIBS dual-channel optical path is arranged in the housing, a window is provided on the housing for laser and LIBS signals to pass through, a handle is provided at the bottom of the housing, and a base is provided at the end of the handle facing away from the housing.

[0009] The laser and the two spectrometers are arranged in parallel inside the housing.

[0010] A heat dissipation fan is arranged in the shell, and heat dissipation holes are arranged on the shell.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The LIBS dual-channel optical path of this utility model can simultaneously collect data from two different angles and using two different spectral ranges to improve the accuracy and comprehensiveness of the analysis. It can also reduce chromatic aberration when collecting LIBS signals and improve the efficiency of wide-band LIBS signal acquisition. It is suitable for the detection requirements of multiple elements in the sample to be tested and realizes efficient acquisition.

[0013] 2. The handheld LIBS spectrometer of this utility model is convenient for handheld detection and is also easy to place, allowing users to easily perform on-site material analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attachment Figure 1 It is a structural diagram of the dual-channel optical path of the LIBS of the utility model.

[0015] Attachment Figure 2 This is a schematic diagram of the optical path structure of the LIBS dual-channel optical path of the utility model.

[0016] Attachment Figure 3 This is a schematic diagram of the external structure of the handheld LIBS spectrometer of the present invention.

[0017] Attachment Figure 4 This is a schematic diagram of the internal structure of the housing of the handheld LIBS spectrometer of the utility model.

[0018] Numbers shown in the accompanying drawings: 1. Laser; 2. Laser focusing optical path module; 21. First reflector; 22. First plano-convex lens; 3. LIBS signal collection module; 31. Second plano-convex lens; 32. Third plano-convex lens; 33. Fourth plano-convex lens; 34. Second reflector; 35. Fifth plano-convex lens; 4. Spectrometer; 5. Housing; 51. Window; 52. Cooling fan; 53. Cooling hole; 6. Handle; 7. Base. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the utility model specification and claims of the present utility model patent do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0021] like Figure 1 、 Figure 2 As shown, the utility model provides a LIBS dual-channel optical path, including a laser 1, a laser focusing optical path module 2, a LIBS signal collection module 3 and a spectrometer 4, wherein the laser 1 is used to emit laser light; the laser focusing optical path module 2 focuses the laser light emitted by the laser 1 onto the sample to be measured to generate plasma and radiate LIBS signals; two LIBS signal collection modules 3 are provided, which are used to collect the LIBS signals radiated by the plasma and transmit them to the spectrometer 4; two spectrometers 4 are provided, which are respectively connected to the two LIBS signal collection modules 3, and the spectrometer 4 and the LIBS signal collection module 3 can be connected through an optical fiber to analyze the LIBS signals transmitted by the LIBS signal collection module 3.

[0022] The principle of the present invention is as follows: laser light is emitted by a laser 1, then focused on the sample test point through a laser focusing optical path module 2, and bombards the surface of the sample to be tested. When the laser light exceeds the breakdown threshold of the sample, a small amount of sample material will be ablated and excited to generate plasma; when the laser pulse ends, the plasma rapidly diffuses and cools. During this period, atoms and ions in the excited state migrate from the high-energy state back to the low-energy state and radiate characteristic light radiation with a specific wavelength (LIBS signal) outward; the LIBS signal is collected by a dual-channel LIBS signal collection module 3 and transmitted to a spectrometer 4. The spectrometer 4 analyzes the peak position (qualitative) and peak intensity (quantitative) in the plasma emission spectrum (LIBS signal spectrum) to identify the type of elements in the sample and the corresponding content, thereby achieving the purpose of material detection.

[0023] Because light of different wavelengths has different refractive indices when passing through a lens system, the focal point is located at different distances from the lens. For shorter wavelengths, the focal point is located closer to the lens. Compared to a traditional single-channel, single-lens handheld LIBS spectrometer (4), the two LIBS signal collection modules (3) of the present invention can simultaneously collect data from two different angles and within two different spectral ranges, improving the accuracy and comprehensiveness of analysis. This reduces chromatic aberration when collecting LIBS signals and increases the efficiency of wide-band LIBS signal acquisition, making it suitable for multi-element detection in samples and enabling efficient acquisition.

[0024] In one embodiment, a first reflector 21 and a first plano-convex lens 22 are sequentially arranged on the optical path of the laser focusing optical path module 2. The first reflector 21 is used to reflect the laser light to adjust the direction of the laser light and ensure that the laser light can propagate along the predetermined path; the first plano-convex lens 22 is used to focus the parallel laser light, so that all the laser energy can be focused into a single point and hit the sample to be tested, thereby increasing the energy density, thereby generating a high-temperature and high-pressure plasma on the surface of the sample to be tested, and then emitting a LIBS signal; preferably, the surface of the first plano-convex lens 22 is coated with a laser anti-reflection film.

[0025] In one embodiment, a second plano-convex lens 31 and a third plano-convex lens 32 are sequentially arranged on the optical path of one of the LIBS signal collection modules 3; the second plano-convex lens 31 is used to collimate the LIBS signal emitted by the sample, and the third plano-convex lens 32 is used to focus the collimated LIBS signal onto the spectrometer. A fourth plano-convex lens 33, a second reflector 34, and a fifth plano-convex lens 35 are sequentially arranged on the optical path of the other LIBS signal collection module 3; the fourth plano-convex lens 33 is used to collimate the LIBS signal emitted by the sample, the second reflector 34 reflects the collimated LIBS signal, and the fourth plano-convex lens 33 focuses the reflected LIBS signal onto the spectrometer.

[0026] In this embodiment, the two LIBS signal collection modules are set up to collect data from two different angles and using two different spectral ranges, thereby optimizing the optical path, reducing the impact of chromatic aberration, and improving the collection efficiency and quality of LIBS signals.

[0027] like Figure 3 、 Figure 4 As shown, the present invention also provides a handheld LIBS spectrometer, comprising a housing 5, within which a dual-channel LIBS optical path is disposed. A window 51 is provided on the housing 5 for the passage of laser and LIBS signals. A handle 6 is provided at the bottom of the housing 5, and a base 7 is provided at the end of the handle 6 facing away from the housing 5. The handle 6 facilitates the handling of the spectrometer 4 for testing. The base 7 is an extension of the handle 6, providing a stable support point, allowing the handheld LIBS spectrometer 4 to be placed on a flat surface.

[0028] Furthermore, the laser 1 and the two spectrometers 4 are arranged in parallel inside the housing 5 to save space.

[0029] Furthermore, in order to improve the heat dissipation performance of the present invention, a heat dissipation fan 52 is provided in the housing 5 , and heat dissipation holes 53 are provided on the housing 5 .

[0030] Those skilled in the art should understand that the above-mentioned specific embodiments are merely examples and not limitations. Various modifications, combinations, partial combinations and replacements can be made to the embodiments of the present invention according to design requirements and other factors. As long as they are within the scope of the attached claims or their equivalents, they fall within the scope of rights to be protected by the present invention.

Claims

1. A LIBS dual-channel optical path, characterized in that: It includes a laser, a laser focusing optical path module, a LIBS signal collection module and a spectrometer. The laser is used to emit laser light; the laser focusing optical path module focuses the laser light emitted by the laser onto the sample to be tested to generate plasma and radiate LIBS signals; There are two LIBS signal collection modules for collecting the LIBS signals emitted by the plasma and transmitting them to the spectrometer; there are two spectrometers, which are respectively connected to the two LIBS signal collection modules to analyze the LIBS signals transmitted by the LIBS signal collection modules.

2. A LIBS dual-channel optical path according to claim 1, characterized in that: A first reflector and a first plano-convex lens are sequentially arranged on the optical path of the laser focusing optical path module.

3. A LIBS dual-channel optical path according to claim 1, characterized in that: A second plano-convex lens and a third plano-convex lens are sequentially arranged on the optical path of one of the LIBS signal collection modules; a fourth plano-convex lens, a second reflector, and a fifth plano-convex lens are sequentially arranged on the optical path of the other LIBS signal collection module.

4. A handheld LIBS spectrometer, characterized in that: The invention comprises a shell, wherein a LIBS dual-channel optical path according to any one of claims 1 to 3 is arranged in the shell, a window piece for passing laser and LIBS signals is arranged on the shell, a handle is arranged at the bottom of the shell, and a base is arranged at the end of the handle away from the shell.

5. A handheld LIBS spectrometer according to claim 4, characterized in that, The laser and the two spectrometers are arranged in parallel inside the housing.

6. A handheld LIBS spectrometer according to claim 4, characterized in that, A heat dissipation fan is arranged in the shell, and heat dissipation holes are arranged on the shell.

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