CN219123663U - Excitation light path component, ion source and mass spectrometer - Google Patents
Excitation light path component, ion source and mass spectrometer Download PDFInfo
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- CN219123663U CN219123663U CN202320111435.8U CN202320111435U CN219123663U CN 219123663 U CN219123663 U CN 219123663U CN 202320111435 U CN202320111435 U CN 202320111435U CN 219123663 U CN219123663 U CN 219123663U
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Abstract
The utility model discloses an excitation light path component, which comprises a laser, a lens group and a fiber head regulator, wherein the lens group is arranged corresponding to the fiber emergent end of the laser, the fiber head regulator is used for regulating the distance between the fiber emergent end of the laser and the lens group, the lens group comprises a first convex lens, a second convex lens and a third convex lens, the second convex lens is positioned between the first convex lens and the third convex lens, and the magnification of the lens group is less than or equal to 0.5. The utility model also provides an ion source, which comprises an ion source shell and the excitation light path component, wherein the bottom of the ion source shell is provided with a target plate, and the excitation light path component is used for focusing a laser spot at the outgoing end of the laser optical fiber on the target plate. The utility model also provides a mass spectrometer. The excitation light path component, the ion source and the mass spectrometer can reduce the diameter of a focused light spot, have the advantages of simple structure and easiness in processing, and can effectively reduce the cost.
Description
Technical Field
The utility model belongs to the technical field of in-vitro diagnosis, and particularly relates to an excitation light path component, an ion source and a mass spectrometer.
Background
The laser system emits ultraviolet light with a certain wavelength, the ultraviolet light is focused on the target plate through the optical lens group, the sample on the target plate obtains energy in a short time, and different samples are decomposed into ions of various corresponding fragments; the ions acquire kinetic energy in an accelerating electric field, enter a high-vacuum field-free flight pipeline and fly in the field-free flight pipeline; the lighter ion has high flying speed and reaches the detector earlier; ions of heavier mass are slow to fly and arrive at the detector later. And (3) calculating the atomic weight or molecular weight of the corresponding ions by measuring the flight time to form a corresponding map.
Currently, some laser paths on the market mainly have the following problems:
1) The focused light spot size is larger, the energy density is lower, the loss of the laser is larger in the running process, and the whole performance is influenced;
2) In some technical schemes, although the focused light spot size is smaller, the problems of complex structure, high processing difficulty and high installation and debugging difficulty exist, and meanwhile, the cost is correspondingly increased.
For example, chinese patent application publication No. CN106290547a discloses a laser path of laser analysis ion source using aspheric lens, and the focused spot diameter is 50-120 μm. Specifically, the optical path distribution of the lens is respectively 40mm < f <100mm plano-convex lens, 20mm < f <100mm aspheric lens and 50mm < f <115mm convex lens from left to right. The ion source laser light path adopts a mode of combining a spherical lens and an aspherical lens to realize the focusing of small light spots, but the processing technology of the aspherical lens is more difficult than that of a common spherical lens, and the cost is greatly increased by using the aspherical lens, so that the method does not accord with the principle of economy.
Publication number CN106444050B discloses a laser path of a laser analysis ion source, and the diameter of a focusing light spot is 50-120 mu m. Specifically, the optical path distribution of the lens is respectively 40mm < f <100mm plano-convex lens, 20mm < f <100mm second convex lens, -100mm < f < -30mm negative meniscus lens and 20mm < f <100mm positive meniscus lens from left to right. The ion source laser light path adopts four lenses, has a complex structure, increases the difficulty of assembly and adjustment, increases the cost to some extent, and does not accord with the economical principle.
Disclosure of Invention
In view of the above, the present utility model aims to provide an excitation light path assembly, an ion source and a mass spectrometer, which can reduce the diameter of a focused light spot, and which has the advantages of simple structure and easy processing, and can effectively reduce the cost.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model firstly provides an excitation light path component which comprises a laser, a lens group and an optical fiber head regulator, wherein the lens group is arranged corresponding to the optical fiber emergent end of the laser, the optical fiber head regulator is used for regulating the distance between the optical fiber emergent end of the laser and the lens group, the lens group comprises a first convex lens, a second convex lens and a third convex lens, the second convex lens is positioned between the first convex lens and the third convex lens, and the magnification of the lens group is smaller than or equal to 0.5.
Further, the distance between the optical fiber emergent end and the first convex lens is smaller than the focal length of the first convex lens; the first convex lens images the emergent end of the optical fiber into a virtual image, and the sum of a first image distance of the virtual image relative to the first convex lens and a distance between the first convex lens and the second convex lens is larger than the focal length of the second convex lens; the distance between the second convex lens and the third convex lens is smaller than the second image distance of the second convex lens for imaging the virtual image.
Further, the second convex lens and the third convex lens form a lens combination, and the distance between the first convex lens and the second convex lens is larger than twice of the focal length of the lens combination.
Further, the core diameter of the emergent end of the optical fiber is 200um, and the divergence angle is 25.4 degrees.
Further, the outer diameter of the second convex lens is larger than the outer diameter of the third convex lens.
Further, the diameter of the first convex lens is 25mm < D1 < 30mm; the diameter of the second convex lens is 25mm < D2 < 30mm; the diameter of the third convex lens is more than 10mm and less than 15mm and D3.
Further, the center thickness of the first convex lens is 2mm < t1 < 4mm; the center thickness of the second convex lens is more than 3mm and less than 5mm, and t2 is more than 3 mm; the center thickness of the third convex lens is 2.5mm < t3 < 3.5mm.
Further, the focal length of the first convex lens is 120mm < f1 < 200mm, the focal length of the second convex lens is 30mm < f2 < 80mm, and the focal length of the third convex lens is 30mm < f3 < 60mm.
Further, the distance between the first convex lens and the second convex lens is 60mm < L1 < 75mm, the distance between the second convex lens and the third convex lens is 10mm < L2 < 15mm, and the distance between the third convex lens and the target surface is 30mm < L3 < 35mm.
Further, the first convex lens and the third convex lens are both plano-convex lenses, and the second convex lens is a biconvex lens.
Further, the side surfaces of the first convex lens and the third convex lens, which are plane, are positioned at one side facing away from the second convex lens.
The utility model also provides an ion source, which comprises an ion source shell and the excitation light path component, wherein the bottom of the ion source shell is provided with a target plate, and the excitation light path component is used for focusing a laser spot at the outgoing end of the laser optical fiber on the target plate.
Further, the lens group comprises a first convex lens and a third convex lens, a second convex lens is arranged between the first convex lens and the third convex lens, and the first convex lens is positioned between the emergent end of the laser optical fiber and the second convex lens; the first convex lens is arranged on the ion source shell, a lens holder is arranged at the position, close to the target plate, in the ion source shell, and the second convex lens and the third convex lens are arranged on the lens holder.
The utility model also proposes a mass spectrometer comprising an ion source as described above.
The utility model has the beneficial effects that:
according to the excitation light path component, the second convex lens is arranged between the first convex lens and the third convex lens, the first convex lens mainly plays a role in primary collimation, the second convex lens and the third convex lens mainly play a role in balancing spherical aberration, and the second convex lens and the third convex lens are combined to play a role in aberration correction and compensation, so that diffuse spots on a focal plane, namely a target surface, are as small as possible, the diameter of a focused spot can be reduced, the magnification of a lens group is smaller than 0.5, the diameter of the spot focused on the target plate can be reduced, and meanwhile, the average power density can be increased; the excitation light path component can achieve the technical purpose of amplifying the multiplying power by 0.5 by only adopting 3 convex lenses, and has the advantages of simple structure and easy processing, and the cost can be effectively reduced.
The utility model has the following technical effects:
(1) The distance between the optical fiber emergent end and the first convex lens is smaller than the focal length of the first convex lens, so that the first convex lens forms a virtual image on the optical fiber emergent end, and the virtual image is positioned on one side of the first convex lens, which is opposite to the second convex lens; meanwhile, adding the first image distance of the virtual image and the distance between the first convex lens and the second convex lens to obtain the object distance of the virtual image relative to the second convex lens, wherein the object distance is larger than the focal length of the second convex lens, and the second convex lens forms a real image on the virtual image; and the distance between the second convex lens and the third convex lens is set to be smaller than the second image distance of the real image, so that the technical purpose of reducing the imaging of the real image is achieved, and the magnification of the whole lens group meets the requirement of being smaller than 0.5.
(2) By setting the distance between the first convex lens and the second convex lens to be larger than twice the focal length of the lens combination formed by the second convex lens and the third convex lens, after the first convex lens forms a virtual image on the emergent end of the optical fiber, the object distance of the virtual image relative to the lens combination can be ensured to be larger than twice the focal length of the lens combination, namely, the lens combination forms a real image on the virtual image and the real image is reduced relative to the virtual image, so that the magnification requirement of the whole lens group is met.
(3) Through setting up first convex lens on the ion source casing, all install second convex lens and third convex lens on the lens holder and form an organic whole structure, namely second convex lens and third convex lens constitute the lens combination, be convenient for assemble and overall arrangement.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present utility model more clear, the present utility model provides the following drawings for description:
FIG. 1 is a schematic diagram of an ion source according to the present utility model;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of region B of FIG. 2;
fig. 4 is a schematic diagram of the optical path of the lens assembly.
Reference numerals illustrate:
10-ion source; 11-target plate; 12-a lens holder;
20-an excitation light path assembly; a 21-laser; 22-the outgoing end of the laser optical fiber; 23-a fiber optic head regulator; 24-a first convex lens; 25-a second convex lens; 26-third convex lens.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the utility model, so that those skilled in the art may better understand the utility model and practice it.
As shown in fig. 1 to 3, the ion source of the present embodiment includes an ion source housing 10 and an excitation light path assembly 20. Specifically, the excitation light path assembly of the present embodiment includes a laser 21, a lens group provided corresponding to the optical fiber exit end 22 of the laser 21, and an optical fiber head adjuster 23 for adjusting the interval between the optical fiber exit end 22 and the lens group. In this embodiment, the bottom of the ion source housing is provided with a target plate 11, and the excitation light path component 20 is used to focus the laser spot at the outgoing end 22 of the laser fiber on the target plate 11. In this embodiment, the lens group includes a first convex lens 24, a second convex lens and a third convex lens, the second convex lens is located between the first convex lens and the third convex lens, and the magnification of the lens group is less than or equal to 0.5, so that the average power density can be increased while the diameter of the light spot focused on the target plate 11 can be reduced.
Specifically, in the present embodiment, the distance between the optical fiber exit end 22 and the first convex lens 24 is smaller than the focal length of the first convex lens 24, so that the first convex lens 24 forms a virtual image on the optical fiber exit end, and the virtual image is located on the side of the first convex lens 24 facing away from the second convex lens 25, i.e. the virtual image is farther from the second convex lens 25 than the first convex lens 24 is from the second convex lens 25. In this embodiment, the sum of the first image distance of the virtual image relative to the first convex lens 24 and the distance between the first convex lens 24 and the second convex lens 25 is larger than the focal length of the second convex lens 25, i.e. the object distance is larger than the focal length of the second convex lens 25, and the second convex lens 25 images the virtual image. Meanwhile, the distance between the second convex lens 25 and the third convex lens 26 is set to be smaller than the second image distance of the second convex lens 25 for imaging the virtual image, so that the technical purpose of reducing the imaging of the real image is achieved, and the magnification of the whole lens group can meet the requirement of being smaller than 0.5. In a preferred embodiment of the present embodiment, the second convex lens 25 and the third convex lens 26 form a lens combination, and the distance between the first convex lens 24 and the second convex lens 25 is greater than twice the focal length of the lens combination. In this way, after the first convex lens 24 forms a virtual image on the optical fiber exit end 22, the object distance of the virtual image relative to the lens assembly can be ensured to be greater than twice the focal length of the lens assembly, that is, the lens assembly forms a real image on the virtual image and the real image is reduced relative to the virtual image, so as to meet the magnification requirement of the whole lens assembly. Specifically, in the present embodiment, the first convex lens 24 is mounted on the ion source housing 10, the lens holder 13 is provided in the ion source housing 10 at a position close to the target plate 11, and the second convex lens 25 and the third convex lens 26 are mounted on the lens holder 13, so that the second convex lens 25 and the third convex lens 26 can be seen as a whole, i.e., the second convex lens 25 and the third convex lens 26 constitute a lens combination.
In this embodiment, the core diameter of the optical fiber exit end 22 is 200um, the divergence angle is 25.4 °, and the optical fiber head regulator 23 is used to regulate the distance between the optical fiber exit end 22 and the first convex lens 24, so as to regulate the first image distance of the virtual image imaged by the first convex lens 24, further change the distance between the virtual image and the second convex lens 25, and finally change the size of the light spot imaged by the third convex lens 26 on the target plate 11, thereby realizing the technical purpose of regulating the diameter size of the focused light spot, and enabling the diameter of the focused light spot to be 60-200 μm. Specifically, when the distance between the laser fiber exit end 22 and the first convex lens 24 is L 1 At=30.5 mm, the focal spot is smallest
In the preferred embodiment of the present utility model, the outer diameter of the second convex lens 25 is larger than the outer diameter of the third convex lens 26, and since the first convex lens 24 forms a virtual image on the optical fiber emitting end 22, the light emitted from the optical fiber emitting end 22 is still divergent after being refracted by the first convex lens 24, so that the outer diameter of the second convex lens 25 is set larger, and all divergent light can be received. The second convex lens 25 forms a real image, and the divergent light rays are refracted by the second convex lens 25 and then form a convergent shape, so that all the light rays can be converged on the third convex lens 26 to finally form an image on the target plate 11, the second convex lens 25 is utilized to the maximum extent, and no energy loss is caused. Specifically, in this embodiment, the diameter of the first convex lens 24 is 25mm < D1 < 30mm; the diameter of the second convex lens 25 is 25mm < D2 < 30mm; the diameter of the third convex lens 26 is 10mm < D3 < 15mm. In the present embodiment, the center thickness of the first convex lens 24 is 2mm < t1 < 4mm; the center thickness of the second convex lens 25 is 3mm < t2 < 5mm; the thickness of the center of the third convex lens 26 is more than 2.5mm and less than 3.5mm, namely the first convex lens 24, the second convex lens 25 and the third convex lens 26 are all common spherical lenses, so that the production and processing cost is further reduced.
Specifically, in this embodiment, the focal length of the first convex lens 24 is 120mm < f1 < 200mm, the focal length of the second convex lens 25 is 30mm < f2 < 80mm, and the focal length of the third convex lens 26 is 30mm < f3 < 60mm. As shown in fig. 4, in the present embodiment, the distance between the first convex lens 24 and the second convex lens 25 is 60mm < L1 < 75mm, the distance between the second convex lens 25 and the third convex lens 26 is 10mm < L2 < 15mm, and the distance between the third convex lens 26 and the target surface 11 is 30mm < L3 < 35mm, so that the technical purpose of the magnification of the lens group being equal to or less than 0.5 can be achieved.
As shown in fig. 4, in the present embodiment, the first convex lens 24 and the third convex lens 26 are both plano-convex lenses, and the second convex lens 25 is a biconvex lens. In the preferred embodiment of the present utility model, the planar sides of the first convex lens 24 and the third convex lens 26 are both located on the side facing away from the second convex lens 25, so that the planar side of the first convex lens 24 can replace sealing glass, and can more conveniently seal with the ion source housing 10.
The present embodiment also proposes a mass spectrometer comprising an ion source as described above.
The above-described embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model. The protection scope of the utility model is subject to the claims.
Claims (14)
1. An excitation light path assembly, characterized by: the optical fiber head adjusting device comprises a laser, a lens group and an optical fiber head adjusting device, wherein the lens group is arranged corresponding to the optical fiber outgoing end of the laser, the optical fiber head adjusting device is used for adjusting the distance between the optical fiber outgoing end of the laser and the lens group, the lens group comprises a first convex lens, a second convex lens and a third convex lens, the second convex lens is located between the first convex lens and the third convex lens, and the magnification of the lens group is smaller than or equal to 0.5.
2. The excitation light path assembly of claim 1, wherein: the distance between the optical fiber emergent end and the first convex lens is smaller than the focal length of the first convex lens; the first convex lens images the emergent end of the optical fiber into a virtual image, and the sum of a first image distance of the virtual image relative to the first convex lens and a distance between the first convex lens and the second convex lens is larger than the focal length of the second convex lens; the distance between the second convex lens and the third convex lens is smaller than the second image distance of the second convex lens for imaging the virtual image.
3. The excitation light path assembly of claim 2, wherein: and forming a lens combination by the second convex lens and the third convex lens, wherein the distance between the first convex lens and the second convex lens is more than twice of the focal length of the lens combination.
4. The excitation light path assembly of claim 2, wherein: the core diameter of the emergent end of the optical fiber is 200um, and the divergence angle is 25.4 degrees.
5. The excitation light path assembly of claim 2, wherein: the outer diameter of the second convex lens is larger than that of the third convex lens.
6. The excitation light path assembly of claim 5, wherein: the diameter of the first convex lens is 25mm < D1 < 30mm; the diameter of the second convex lens is 25mm < D2 < 30mm; the diameter of the third convex lens is more than 10mm and less than 15mm and D3.
7. The excitation light path assembly of claim 6, wherein: the center thickness of the first convex lens is more than 2mm and less than 4mm, and t1 is more than 2 mm; the center thickness of the second convex lens is more than 3mm and less than 5mm, and t2 is more than 3 mm; the center thickness of the third convex lens is 2.5mm < t3 < 3.5mm.
8. The excitation light path assembly of claim 2, wherein: the focal length of the first convex lens is 120mm < f1 < 200mm, the focal length of the second convex lens is 30mm < f2 < 80mm, and the focal length of the third convex lens is 30mm < f3 < 60mm.
9. The excitation light path assembly of claim 8, wherein: the distance between the first convex lens and the second convex lens is 60mm < L1 < 75mm, the distance between the second convex lens and the third convex lens is 10mm < L2 < 15mm, and the distance between the third convex lens and the target surface is 30mm < L3 < 35mm.
10. The excitation light path assembly of claim 1, wherein: the first convex lens and the third convex lens are both plano-convex lenses, and the second convex lens is a biconvex lens.
11. The excitation light path assembly of claim 10, wherein: the side surfaces of the first convex lens and the third convex lens, which are plane, are positioned at one side opposite to the second convex lens.
12. An ion source, characterized by: the laser comprises an ion source shell and an excitation light path component as claimed in any one of claims 1-11, wherein a target plate is arranged at the bottom of the ion source shell, and the excitation light path component is used for focusing a laser spot at the outgoing end of the laser fiber on the target plate.
13. The ion source of claim 12, wherein: the lens group comprises a first convex lens and a third convex lens, a second convex lens is arranged between the first convex lens and the third convex lens, and the first convex lens is positioned between the emergent end of the laser optical fiber and the second convex lens; the first convex lens is arranged on the ion source shell, a lens holder is arranged at the position, close to the target plate, in the ion source shell, and the second convex lens and the third convex lens are arranged on the lens holder.
14. A mass spectrometer, characterized by: an ion source comprising the ion source of claim 12 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320111435.8U CN219123663U (en) | 2023-01-18 | 2023-01-18 | Excitation light path component, ion source and mass spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320111435.8U CN219123663U (en) | 2023-01-18 | 2023-01-18 | Excitation light path component, ion source and mass spectrometer |
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| CN219123663U true CN219123663U (en) | 2023-06-02 |
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| CN202320111435.8U Active CN219123663U (en) | 2023-01-18 | 2023-01-18 | Excitation light path component, ion source and mass spectrometer |
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