Coaxial DP-LIBS spectrum collection device

Abstract

The utility model discloses a coaxial DP-LIBS spectrum collecting device, which comprises a laser, a light path adjusting device, a spectroscope I, a spectroscope II, a lens and a scattered spectrum collecting device, laser emitted by the laser is divided into a laser beam I and a laser beam II through the spectroscope I. The light path adjusting device can generate light path difference between the laser beam I and the laser beam II. The laser beam I and the laser beam II can form coaxial laser beams through reflection and transmission of the spectroscope II, the coaxial laser beams are focused and bombarded on a target material through a lens to generate plasma plumes, and the scattered spectrum collecting device comprises a concave reflector and a spectrum collector. The concave reflecting mirror is arranged on one side of the generated plasma plume, and the collecting end of the spectrum collector is arranged on one side, back to the concave reflecting mirror, of the generated plasma plume and located on the focus of the concave reflecting mirror. According to the utility model, the plasma plume spectrum collection efficiency is improved, and the detection lower limit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical detection technical field, concretely relates to a coaxial DP-LIBS spectrum collection device. BACKGROUND

[0002] Double pulse laser excitation (DP-LIBS) refers to the action of two laser pulses, which are separated by several nanoseconds to several tens of microseconds, to the same position of the inspected substance. The double pulse technology has great advantages in spectral detection compared with the single pulse technology, such as greatly improving the ablation and excitation of laser on the material, enhancing the spectral line intensity of the plasma, and thus reducing the detection limit of spectral analysis. At present, for the DP-LIBS optical path, it is particularly urgent to increase the plasma plume spectrum collection efficiency and reduce the detection lower limit. However, for the existing lens collection of plasma plume spectrum by setting up beside the plasma plume, the collected spectral information is less, resulting in low spectral collection efficiency, thus reducing the spectral detection capability. SUMMARY

[0003] In view of the above technical problems of the prior art, the technical problem to be solved by the utility model is how to provide a lateral intersection DP-LIBS spectrum collection device capable of increasing spectral collection information and improving spectral detection capability.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A coaxial DP-LIBS spectrum collection device, comprising a laser, an optical path adjusting device, a beam splitter I, a beam splitter II, a lens and a scattered spectrum collection device, the laser emitted laser can be divided into laser beam I and laser beam II through the beam splitter I, the optical path adjusting device can produce an optical path difference between the laser beam I and the laser beam II, the laser beam I and the laser beam II with the optical path difference can form a coaxial laser beam through the reflection and transmission of the beam splitter II, the coaxial laser beam can be focused on the target material through the lens to produce a plasma plume, the scattered spectrum collection device comprises a concave mirror and a spectrum collector, the concave mirror is arranged on one side of the produced plasma plume, the concave mirror can collect the produced LIBS spectrum, and the collection end of the spectrum collector is arranged on the side of the produced plasma plume opposite to the concave mirror and located on the focal point of the concave mirror.

[0006] As an optimization, the optical path adjusting device comprises an incident mirror, a moving mirror, an emission mirror and a moving driving device, the laser beam I can be reflected by the incident mirror, the moving mirror and the emission mirror in turn and then shot to the beam splitter 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 respectively.

[0007] As optimization, the incidence mirror, the moving mirror and the emission mirror are all total reflection mirrors.

[0008] As optimization, a filter is arranged between the concave mirror and the collection end of the spectrum collector, the filter is located on the same side of the generated plasma plume at the collection end of the spectrum collector, the plane of the filter is perpendicular to the reflection optical axis of the concave mirror, and the wavelength of the filter is consistent with the collected spectrum wavelength of the spectrum collector.

[0009] As optimization, 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 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.

[0010] As optimization, an aperture is further arranged on the light path between the laser and the beam splitter I.

[0011] As optimization, a high reflection mirror is further arranged on the light path between the laser and the beam splitter I, the laser emitted by the laser can be reflected by the high reflection mirror and then emitted to the beam splitter I, and the transmission light path end of the high reflection mirror is provided with a power meter for measuring the power of the transmission light path of the high reflection mirror.

[0012] Compared with the prior art, the utility model discloses a concave mirror is placed at the collection end of the spectrum collector and is located at the back position of the target material action area, and the spectrum collection area at a certain distance is increased through the concave mirror, more plasma plume spectrum information is collected, the plasma plume spectrum collection efficiency is improved, and the detection lower limit is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0015] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should also be explained that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0016] As Figure 1As shown, the coaxial DP-LIBS spectrum collection device in the embodiment includes a laser 1, an optical path adjusting device, a beam splitter I 2, a beam splitter II 3, a lens 4, and a scattered spectrum collection device. The laser emitted by the laser 1 can pass through the beam splitter I 2 to be divided into a laser beam I and a laser beam II. The optical path adjusting device can cause an optical path difference between the laser beam I and the laser beam II. The laser beam I and the laser beam II with the optical path difference can pass through the reflection and transmission of the beam splitter II 3 to form a coaxial laser beam, and the coaxial laser beam can be focused on the target material 16 by the lens 4 to generate a plasma plume. The scattered spectrum collection device includes a concave mirror 5 and a spectrum collector. The concave mirror 5 is arranged on one side of the generated plasma plume, and the concave mirror 5 can collect the generated LIBS spectrum. The collection end of the spectrum collector is arranged on the side of the generated plasma plume opposite to the concave mirror 5 and located on the focal point of the concave mirror 5.

[0017] In the embodiment, the optical path adjusting device includes an incident mirror 6, a moving mirror 7, an emission mirror 8, and a moving driving device. The laser beam I can be reflected by the incident mirror 6, the moving mirror 7, and the emission mirror 8 in sequence and then irradiated to the beam splitter II 3. The moving driving device acts on the moving mirror 7 and can drive the moving mirror 7 to move, so as to change the optical path between the moving mirror 7 and the incident mirror 6 and the emission mirror 8, respectively.

[0018] In the embodiment, the incident mirror 6, the moving mirror 7, and the emission mirror 8 are all total reflection mirrors.

[0019] In the embodiment, a filter 9 is arranged between the concave mirror 5 and the collection end of the spectrum collector. The filter 9 is located on the same side of the generated plasma plume as the collection end of the spectrum collector. The plane where the filter 9 is located is perpendicular to the reflection optical axis of the concave mirror 5. The wavelength of the filter 9 is consistent with the collected spectrum wavelength of the spectrum collector.

[0020] In the embodiment, the spectrum collector includes an optical fiber probe 10, an ICCD device 11, and a computer 12. The optical fiber probe 10 is used to collect spectrum information. The output end of the optical fiber probe 10 is connected to the input end of the ICCD device 11 through an optical fiber. The output end of the ICCD device 11 is electrically connected to the input end of the computer 12.

[0021] In the embodiment, an aperture 13 is further arranged on the optical path between the laser 1 and the beam splitter I 2.

[0022] In the embodiment, a high-reflection mirror 14 is further arranged on the light path between the laser and the beam splitter I 2, and the laser emitted by the laser 1 can be reflected by the high-reflection mirror 14 and then irradiated to the beam splitter I 2, and a power meter 15 for measuring the power of the transmission light path of the high-reflection mirror 14 is arranged at the transmission light path end of the high-reflection mirror 14.

[0023] The utility model discloses a big aperture concave mirror is placed to the target material action area back -to -back, and the filter is placed to the opposite direction, and the spectrum signal is collected to make the coaxial DP -LIBS pulse laser spectrum signal -to -noise ratio greatly promote, and real -time, fast, trace detection target material of measuring, guarantee whole system reliably, efficiently carries out.

[0024] Finally, it needs to be explained that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit the technical solutions, and those of ordinary skill in the art should understand that those who modify or equivalently replace the technical solutions of the utility model without departing from the purpose and scope of the technical solutions should be covered in the claim range of the utility model.

Claims

1. A coaxial DP-LIBS spectrum collection device, characterized in that: The laser, the light path adjusting device, the beam splitter I, the beam splitter II, the lens and the scattered spectrum collecting device are included, the laser emitted by the laser can be divided into laser beam I and laser beam II through the beam splitter I, the light path adjusting device can produce an optical path difference between the laser beam I and the laser beam II, the laser beam I and the laser beam II with the optical path difference can form a coaxial laser beam through the reflection and transmission of the beam splitter II, the coaxial laser beam can be focused on the target material to produce a plasma plume, the concave mirror and the spectrum collector are included in the scattered spectrum collecting device, the concave mirror is arranged on one side of the produced plasma plume, the concave mirror can collect the produced LIBS spectrum, and the collecting end of the spectrum collector is arranged on the side of the produced plasma plume opposite to the concave mirror and located on the focal point of the concave mirror.

2. The coaxial DP-LIBS spectrum collection apparatus according to 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 I can be reflected by the incident mirror, the moving mirror and the emission mirror in sequence and then be emitted to the beam splitter 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.

3. The coaxial DP-LIBS spectrum collection apparatus according to claim 2, wherein: The incident mirror, the moving mirror and the emission mirror are all total reflection mirrors.

4. The coaxial DP-LIBS spectrum collection apparatus according to claim 1, wherein: A filter is arranged between the concave mirror and the collecting end of the spectrum collector, the filter is located on the same side of the produced plasma plume as the collecting end of the spectrum collector, the plane where the filter is located is perpendicular to the reflection optical axis of the concave mirror, the wavelength of the filter is consistent with the collected spectrum wavelength of the spectrum collector.

5. The coaxial DP-LIBS spectrum collection apparatus according to 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 coaxial DP-LIBS spectrum collection apparatus according to claim 1, wherein: A diaphragm is further arranged on the light path between the laser and the beam splitter I.

7. The coaxial DP-LIBS spectrum collection apparatus according to claim 1, wherein: A high reflection mirror is further arranged on the light path between the laser and the beam splitter I, the laser emitted by the laser can be reflected by the high reflection mirror and then be emitted to the beam splitter I, and a power meter for measuring the transmitted light path of the high reflection mirror is arranged at the transmitted light path end of the high reflection mirror.

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