Orthogonal DP-LIBS spectrum collection device

Abstract

The utility model discloses an orthogonal DP-LIBS spectrum collecting device which comprises a laser, a spectroscope, a light path adjusting device, a lens I, a lens II, a lens III and a spectrum collector, laser emitted by the laser is divided into a laser beam I and a laser beam II after passing through the spectroscope, the laser beam I is focused and bombarded on a target material to generate plasma plume after passing through the lens I, and the laser beam II is focused and bombarded on the target material to generate laser plume. The laser beam II passes through the optical path adjusting device to generate an optical path difference between the laser beam II and the laser beam I, the laser beam II can be focused and bombarded on the generated plasma plume after passing through the lens II, and the optical axis of the laser beam I after passing through the lens I is orthogonal to the optical axis of the laser beam II after passing through the lens II; the lens III is arranged on one side of the generated plasma plume, and the collecting end of the spectrum collector is arranged on one side, opposite to the generated plasma plume, of the lens III and located on the focusing point of the lens III. According to the utility model, the stability of spectral signals is ensured, and the signal-to-noise ratio of the orthogonal DP-LIBS spectrum is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical detection technology, specifically to an orthogonal DP-LIBS spectral collection device. Background Technology

[0002] Laser-induced breakdown spectroscopy (LIBS) is an emerging photochemical analysis technique for material composition. Compared with other detection methods, LIBS offers advantages such as no sample pretreatment required, online, in-situ, rapid, and non-contact simultaneous multi-element analysis. Currently, it has significant application value in industries such as agriculture, aerospace, and materials science, and is therefore attracting increasing attention. While LIBS has significant advantages, the low plasma temperature of single-pulse LIBS excitation results in limited emission spectral intensity, leading to poor signal-to-noise ratio, which has become a key bottleneck restricting its development. This results in relatively low spectral analysis sensitivity and relatively high detection limits. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide an orthogonal DP-LIBS spectral collection device that can improve the signal-to-noise ratio of the detection spectrum and increase the spectral detection capability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An orthogonal DP-LIBS spectral collection device includes a laser, a beam splitter, an optical path adjustment device, lens I, lens II, lens III, and a spectral collector. The laser emitted by the laser is split into laser beam I and laser beam II after passing through the beam splitter. Laser beam I is focused after passing through lens I and bombards a target to generate a plasma plume. Laser beam II is adjusted by the optical path adjustment device to create an optical path difference between laser beam II and laser beam I. Laser beam II with the optical path difference is focused after passing through lens II and bombards the generated plasma plume. The optical axis of laser beam I after passing through lens I is orthogonal to the optical axis of laser beam II after passing through lens II. Lens III is disposed on one side of the generated plasma plume and can focus the generated LIBS spectrum. The collecting end of the spectral collector is disposed on the side of lens III opposite to the generated plasma plume and is located at the focusing point of lens III.

[0006] As an optimization, a target translation device is also included. The target translation device is used to install the target and enables the target to move in a plane perpendicular to the optical axis of the laser beam I after passing through lens I. The focal point of the laser beam I after passing through lens I is located on the moving plane on which the target is moved by the target translation device.

[0007] As an optimization, the optical path adjustment device includes an incident mirror, a movable mirror, an exit mirror, and a movement driving device. The laser beam II can be reflected sequentially by the incident mirror, the movable mirror, and the exit mirror before being directed toward the lens II. The movement driving device acts on the movable mirror and can drive the movable mirror to move, thereby changing the optical path between the movable mirror and the incident mirror and the exit mirror, respectively.

[0008] As an optimization, the incident mirror, the moving mirror, and the exit mirror are all total reflection mirrors.

[0009] As an optimization, the spectral collector includes an optical fiber probe, an ICCD device, and a computer. The optical fiber probe is used to collect spectral information, and the output end of the optical fiber probe is connected to the input end of the ICCD device via an optical fiber. The output end of the ICCD device is electrically connected to the input end of the computer.

[0010] As an optimization, an aperture is also provided in the optical path between the laser and the beam splitter.

[0011] As an optimization, a high-reflection mirror is also provided in the optical path between the laser and the beam splitter. The laser emitted by the laser can be reflected by the high-reflection mirror and then directed to the beam splitter. A power meter for measuring the power of the transmission optical path of the high-reflection mirror is provided at the transmission optical path end of the high-reflection mirror.

[0012] Compared with the prior art, in this invention, the laser emits pulsed laser light, which is split into two pulsed laser beams by a beam splitter. One beam is directly incident on the surface of the target material to generate a plasma plume. The other beam passes through an optical path adjustment device, and the pulsed laser beam with movable optical path can be orthogonally incident into the first LIBS plasma plume to heat the plasma plume and maximize the signal-to-noise ratio of the LIBS spectrum.

[0013] By placing the target on a target translation device that moves radially in two dimensions in the direction of incident light, the target can move slowly along an S-shaped path, ensuring that each laser pulse bombards the fresh target surface and is not affected by the ablation holes left after the previous laser pulse bombardment, thus ensuring the stability of the spectral signal. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0016] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1As shown, the orthogonal DP-LIBS spectral collection device in this specific embodiment includes a laser 1, a beam splitter 2, an optical path adjustment device, lens I 3, lens II 4, lens III 5, and a spectral collector. The laser emitted by the laser 1 can be split into laser beam I and laser beam II after passing through the beam splitter 2. Laser beam I can be focused and bombarded on the target material 15 after passing through lens I 3 to generate a plasma plume. Laser beam II can be adjusted by the optical path adjustment device to generate an optical path difference between laser beam II and laser beam I. Laser beam II with optical path difference can be focused and bombarded on the generated plasma plume after passing through lens II 4. The optical axis of laser beam I after passing through lens I 3 is orthogonal to the optical axis of laser beam II after passing through lens II 4. Lens III 5 is set on one side of the generated plasma plume. Lens III 5 can focus the generated LIBS spectrum. The collecting end of the spectral collector is set on the side of lens III 5 that is away from the generated plasma plume and is located at the focusing point of lens III 5.

[0018] In this specific embodiment, a target translation device is also included. The target translation device is used to install the target 15 and can move the target 15 in a plane perpendicular to the optical axis of the laser beam I after passing through the lens I3. The focal point of the laser beam I after passing through the lens I3 is located on the moving plane on which the target 15 is moved by the target translation device.

[0019] In this specific embodiment, the optical path adjustment device includes an incident reflector 6, a movable reflector 7, an exit reflector 8, and a movement driving device. The laser beam II can be reflected sequentially by the incident reflector 6, the movable reflector 7, and the exit reflector 8 before being directed toward the lens II 4. The movement driving device acts on the movable reflector 7 and can drive the movable reflector 7 to move, thereby changing the optical path between the movable reflector 7 and the incident reflector 6 and the exit reflector 8, respectively.

[0020] In this specific embodiment, the incident reflector 6, the movable reflector 7, and the exit reflector 8 are all total reflection mirrors.

[0021] In this specific embodiment, the spectral collector includes an optical fiber probe 9, an ICCD device 10, and a computer 11. The optical fiber probe 9 is used to collect spectral information. The output end of the optical fiber probe 9 is connected to the input end of the ICCD device 10 via an optical fiber. The output end of the ICCD device 10 is electrically connected to the input end of the computer 11.

[0022] In this specific embodiment, an aperture stop 12 is also provided in the optical path between the laser 1 and the beam splitter 2.

[0023] In this specific embodiment, a high-reflection mirror 13 is also provided in the optical path between the laser 1 and the beam splitter 2. The laser emitted by the laser 1 can be reflected by the high-reflection mirror 13 and then directed to the beam splitter 2. A power meter 14 for measuring the power of the transmission optical path of the high-reflection mirror 13 is provided at the transmission optical path end of the high-reflection mirror 13.

[0024] This invention ensures spectral signal stability by moving the target material to bombard the surface of a fresh target with laser pulses. Furthermore, by orthogonally incident two pulsed laser beams with staggered phase differences, one beam, whose optical path can be adjusted via an optical path adjustment device, is orthogonally incident into the first LIBS plasma plume, heating the plasma plume and significantly improving the signal-to-noise ratio of the orthogonal DP-LIBS spectrum. Real-time, rapid, and micro-volume detection of aerosol samples ensures the reliability and efficiency of the entire system.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A orthogonal DP-LIBS spectrum collection device, characterized in that: The laser, the beam splitter, the light path adjusting device, the lens I, the lens II, the lens III and the spectrum collector are included, the laser emitted by the laser can be divided into laser beam I and laser beam II after passing through the beam splitter, the laser beam I can be focused on the target material to generate a plasma plume after passing through the lens I, the laser beam II can pass through the light path adjusting device to generate an optical path difference between the laser beam II and the laser beam I, the laser beam II with the optical path difference can be focused on the generated plasma plume after passing through the lens II, the optical axis of the laser beam I after passing through the lens I is orthogonal to the optical axis of the laser beam II after passing through the lens II, the lens III is arranged on one side of the generated plasma plume, the lens III can collect the generated LIBS spectrum, and the collecting end of the spectrum collector is arranged on the side of the lens III opposite to the generated plasma plume and located on the focusing focal point of the lens III.

2. The orthogonal DP-LIBS spectrum collection apparatus of claim 1, wherein: The target material translation device is further included, the target material translation device is used for mounting the target material and can move the target material in a plane perpendicular to the optical axis of the laser beam I after passing through the lens I, and the focusing focal point of the laser beam I after passing through the lens I is located on the moving plane of the target material translation device.

3. The orthogonal DP-LIBS spectrum collection apparatus of claim 1, wherein: The light path adjusting device includes an incident mirror, a moving mirror, an emission mirror and a moving driving device, the laser beam II can be reflected by the incident mirror, the moving mirror and the emission mirror in sequence and then emitted to the lens II, the moving driving device acts on the moving mirror and can drive the moving mirror to move, so as to change the optical path between the moving mirror and the incident mirror and the emission mirror.

4. The orthogonal DP-LIBS spectrum collection apparatus of claim 3, wherein: The incident mirror, the moving mirror and the emission mirror are all total reflection mirrors.

5. The orthogonal DP-LIBS spectrum collection apparatus of claim 1, wherein: The spectrum collector includes a fiber probe, an ICCD device and a computer, the fiber probe is used for collecting spectrum information, the output end of the fiber probe is connected to the input end of the ICCD device through an optical fiber, and the output end of the ICCD device is electrically connected to the input end of the computer.

6. The orthogonal DP-LIBS spectrum collection apparatus of claim 1, wherein: A diaphragm is further arranged on the optical path between the laser and the beam splitter.

7. The orthogonal DP-LIBS spectrum collection apparatus of claim 1, wherein: A high reflection mirror is further arranged on the optical path between the laser and the beam splitter, the laser emitted by the laser can be reflected by the high reflection mirror and then emitted to the beam splitter, and the transmission optical path end of the high reflection mirror is provided with a power meter used for measuring the power of the transmission optical path of the high reflection mirror.

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