Flow gas type aerosol LIBS spectrum collecting device

Abstract

The utility model discloses a gas flow type aerosol LIBS (Laser-induced Breakdown Spectroscopy) spectrum collecting device which comprises a laser, a condensing lens, an aerosol container and a spectrum collector, a vacuum target chamber is arranged in the aerosol container, a plane lens I and a plane lens II are arranged on the aerosol container, laser emitted by the laser device can be focused in the vacuum target chamber through the condensing lens, the aerosol container is further provided with a spraying air nozzle communicated with the interior of the vacuum target chamber, the outer opening end of the spraying air nozzle is used for being connected with an aerosol spraying device, and the spraying axis of the inner opening end of the spraying air nozzle is orthogonal to the focusing optical axis of the condensing lens. A focusing lens is further arranged in the vacuum target chamber, the focusing lens enables gathered LIBS spectrums to penetrate through the plane lens II to the outside of the aerosol container, the spectrum collector is located outside the aerosol container, and the focusing lens is arranged in the aerosol container. And the collecting end of the spectrum collector is positioned on the focusing point of the focusing lens.

Description

Technical Field

[0001] This utility model relates to the field of optical detection technology, specifically to a flow-type aerosol 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. However, during the spectral collection process, its detection accuracy is significantly affected by the composition and physical state of the ambient gas. The type, pressure, and temperature of the ambient gas directly influence the formation and evolution of the plasma: on the one hand, the interaction between the ambient gas and the laser-induced plasma alters key parameters such as electron density and excited-state particle lifetime, leading to spectral broadening, intensity fluctuations, and baseline drift; on the other hand, the selective absorption of specific wavelengths by different gas molecules generates additional spectral background, such as oxygen absorption of ultraviolet lines and water vapor interference in the near-infrared region. In high-pressure or high-humidity environments, the plasma quenching effect is exacerbated, significantly reducing the signal-to-noise ratio of characteristic spectral lines. Furthermore, plasma morphology disturbances caused by ambient gas flow and the secondary excitation effect of atmospheric suspended particulate matter introduce random noise. These factors pose stability challenges for LIBS applications in open environments, with environmental gas interference becoming a key factor limiting detection accuracy. 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 a gas-flow aerosol LIBS spectral collection device that reduces the influence of ambient gases on LIBS spectral noise and improves the signal-to-noise ratio of the detection spectrum.

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

[0005] A flow-through aerosol LIBS spectral collection device includes a laser, a focusing lens, an aerosol container, and a spectral collector. The aerosol container contains a vacuum target chamber. Plane lenses I and II, which allow light to pass through the vacuum target chamber, are mounted on the aerosol container. The laser emitted by the laser passes through the focusing lens, allowing the focused laser beam to pass through plane lens I and be focused within the vacuum target chamber. A jet nozzle, communicating with the vacuum target chamber, is also mounted on the aerosol container. The outer end of the jet nozzle is connected to an aerosol jetting device, and the jet axis of the inner end of the jet nozzle is orthogonal to the optical axis focused by the focusing lens. The focal point of the focused beam is located on the jet axis of the inner end of the jet nozzle. A focusing lens is also located within the vacuum target chamber, which focuses the generated LIBS spectrum and allows the focused LIBS spectrum to pass through plane lens II to the outside of the aerosol container. The spectral collector is located outside the aerosol container, and its collecting end is located at the focal point of the focusing lens.

[0006] As an optimization, the focusing lens is a concave mirror, and the concave mirror and the planar lens II are located on both sides of the focal point of the beam after the condenser lens has focused the light.

[0007] As an optimization, the focal point of the beam focused by the condenser lens is located on the optical axis focused by the concave reflector, and the optical axis focused by the concave reflector is perpendicular to the plane containing the injection axis of the inner end of the injection nozzle and the optical axis focused by the condenser lens.

[0008] As an optimization, the aerosol container is connected to a gas pipe that communicates with the vacuum target chamber, and a vacuum pump is connected to the end of the gas pipe away from the aerosol container.

[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 stop is also provided in the optical path between the laser and the focusing lens.

[0011] As an optimization, a high-reflection mirror is also provided in the optical path between the laser and the focusing lens. The laser emitted by the laser can be reflected by the high-reflection mirror and then directed to the focusing lens. 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 existing technologies, this invention reduces the influence of ambient gas on spectral noise by installing a high lens in the window of the vacuum target chamber, while also reducing the energy loss of the incident pulse laser, increasing the energy of the action area, increasing the signal intensity, and further improving the signal-to-noise ratio of the gas-flow aerosol LIBS spectrum. In addition, the large-aperture concave mirror placed in the vacuum target chamber increases the spectral collection area at a certain distance, enabling the collection of more plasma plume spectral information. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] like Figure 1 As shown, the airflow-type aerosol LIBS spectral collection device in this specific embodiment includes a laser 1, a focusing lens 2, an aerosol container 3, and a spectral collector. A vacuum target chamber is provided inside the aerosol container 3. Plane lenses I 4 and II 5, which allow light to penetrate into the vacuum target chamber, are installed on the aerosol container 3. The laser emitted by the laser 1 passes through the focusing lens 2, allowing the focused laser beam to pass through the plane lens I 4 and be focused within the vacuum target chamber. An injection nozzle, communicating with the vacuum target chamber, is also installed on the aerosol container 3. The outer end of the injection nozzle is used to connect to an aerosol injection device. The injection axis of the inner end of the injection nozzle is orthogonal to the optical axis focused by the focusing lens 2, and the focal point of the beam focused by the focusing lens 2 is located on the injection axis of the inner end of the injection nozzle. A focusing lens is also provided within the vacuum target chamber. The focusing lens can focus the generated LIBS spectrum and allow the focused LIBS spectrum to pass through the plane lens II 5 to the outside of the aerosol container 3. The spectral collector is located outside the aerosol container, and its collection end is located at the focal point of the focusing lens.

[0017] In this specific embodiment, the focusing lens is a concave mirror 6, and the concave mirror 6 and the planar lens II 5 are located on both sides of the focal point of the beam focused by the condenser lens 2.

[0018] In this specific embodiment, the focal point of the beam focused by the condenser lens 2 is located on the optical axis focused by the concave reflector 6, and the optical axis focused by the concave reflector 6 is perpendicular to the plane containing the injection axis of the inner end of the injection nozzle and the optical axis focused by the condenser lens 2.

[0019] In this specific embodiment, the aerosol container 3 is connected to a gas pipe that communicates with the vacuum target chamber, and a vacuum pump 7 is connected to the end of the gas pipe away from the aerosol container 3.

[0020] In this specific embodiment, the spectral collector includes an optical fiber probe 8, an ICCD device 9, and a computer 10. The optical fiber probe 8 is used to collect spectral information. The output end of the optical fiber probe 8 is connected to the input end of the ICCD device 9 via an optical fiber. The output end of the ICCD device 9 is electrically connected to the input end of the computer 10.

[0021] In this specific embodiment, an aperture stop 11 is also provided in the optical path between the laser 1 and the focusing lens 2.

[0022] In this specific embodiment, a high-reflection mirror 12 is also provided in the optical path between the laser 1 and the focusing lens 2. The laser emitted by the laser 1 can be reflected by the high-reflection mirror 12 and then directed to the focusing lens 2. A power meter 13 for measuring the power of the transmission optical path of the high-reflection mirror 12 is provided at the transmission optical path end of the high-reflection mirror 12.

[0023] This invention places a large-aperture concave mirror in the direction orthogonal to the laser pulse and the aerosol gas flow, installs a high lens in the window of the vacuum target chamber, and evacuates the vacuum target chamber, thereby greatly improving the signal-to-noise ratio of the gas flow aerosol LIBS spectrum. It enables real-time, rapid, and micro-volume detection of the aerosol sample to be tested, ensuring that the entire system can be carried out reliably and efficiently.

[0024] 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 flowing gas aerosol LIBS spectrum collection device, characterized in that: The application relates to a laser-induced breakdown spectroscopy (LIBS) device, which comprises a laser, a condenser lens, an aerosol container and a spectrum collector, wherein the inside of the aerosol container is provided with a vacuum target chamber, the aerosol container is provided with a plane lens I and a plane lens II capable of allowing light to penetrate into the vacuum target chamber, the laser emits laser light which can pass through the condenser lens to focus a focused laser beam on the vacuum target chamber through the plane lens I, the aerosol container is further provided with a jet nozzle which is in communication with the vacuum target chamber, the outer end of the jet nozzle is used for connecting an aerosol jet device, the jet axis of the inner end of the jet nozzle is perpendicular to the optical axis of the condenser lens, the focus point of the light beam focused by the condenser lens is located on the jet axis of the inner end of the jet nozzle, the vacuum target chamber is further provided with a focusing lens, the focusing lens can collect the generated LIBS spectrum and make the collected LIBS spectrum pass through the plane lens II to the outside of the aerosol container, and the spectrum collector is located outside the aerosol container and the collection end of the spectrum collector is located on the focus point of the focusing lens.

2. The flow-through aerosol LIBS spectrum collection device of claim 1, wherein: The focusing lens is a concave mirror, and the concave mirror and the plane lens II are located on the two sides of the focus point of the light beam focused by the condenser lens.

3. The flow-through aerosol LIBS spectrum collection device of claim 2, wherein: The focus point of the light beam focused by the condenser lens is located on the optical axis of the concave mirror, and the optical axis of the concave mirror is perpendicular to the plane formed by the jet axis of the inner end of the jet nozzle and the optical axis of the condenser lens.

4. The flow-through aerosol LIBS spectrum collection device of claim 1, wherein: The aerosol container is connected with an air pipe which is in communication with the vacuum target chamber, and the end of the air pipe away from the aerosol container is connected with a vacuum air pump.

5. The flow-through aerosol LIBS spectrum collection device of claim 1, wherein: The spectrum collector comprises 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 with the input end of the ICCD device through an optical fiber, and the output end of the ICCD device is electrically connected with the input end of the computer.

6. The flow-through aerosol LIBS spectrum collection device of claim 1, wherein: An aperture is further arranged on the light path between the laser and the condenser lens.

7. The flow-through aerosol LIBS spectrum collection device of claim 1, wherein: A high-reflection mirror is further arranged on the light path between the laser and the condenser lens, the laser emitted by the laser can be reflected by the high-reflection mirror and then shot towards the condenser lens, and the transmission light path end of the high-reflection mirror is provided with a power meter used for measuring the power of the transmission light path of the high-reflection mirror.

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