A fixed single-axis drive energy scanning mechanism for a radiation source

Abstract

The present application relates to a kind of ray source fixed single-shaft drive energy scanning mechanism, X-ray source and its support adjusting mechanism are fixedly installed on installation base plate, spherical bender assembly includes spherical bender and the displacement table that allows spherical bender to move along the direction of incident light, sample and detector assembly are connected with spherical bender assembly by connecting rod mechanism, so that X-ray source and its support adjusting mechanism, spherical bender assembly and sample and detector assembly are precisely linked according to Roland circle configuration.The ray source fixed single-shaft drive energy scanning mechanism according to the present application is based on Roland circle imaging principle, for laboratory spectrometer field, by XRD type X-ray source, spherical bender, sample and detector assembly are precisely linked according to certain Roland circle configuration to realize the absorption spectrum acquisition of different samples in the energy range corresponding to 54.5°-85.5° bragg angle.

Description

Technical Field

[0001] This invention relates to laboratory spectrometers, and more specifically to a fixed single-axis driven energy scanning mechanism for a radiation source. Background Technology

[0002] X-ray absorption spectroscopy is an experimental technique that has matured with the development of synchrotron radiation devices. It is one of the important methods for studying the structure of matter, and can study the local structure of atoms in the nearest neighbor under various conditions such as solid and liquid. It is widely used in many fields such as materials, biology, chemistry, environment and geology.

[0003] Laboratory spectrometers are analytical instruments based on the Loland circle imaging principle, utilizing components such as X-ray sources, spherical curved crystals, detectors, and high-precision displacement stages. They can measure the local structural information of neighboring elements (such as the type, valence state, bond length, and coordination number of coordinating elements).

[0004] The energy scanning mechanism in a laboratory spectrometer is used to acquire X-ray absorption spectra of different test samples. It is a linked mechanism composed of several precision electrically driven stages, which moves the X-ray source, spherical curved crystal, sample, and detector according to a specific Rowland circle configuration to acquire the absorption spectrum. The acquired X-ray absorption spectra can be used to identify the elements contained in the test sample. The absorption lines have specific relationships with atoms, thus allowing the determination of the chemical composition of the sample through which the X-rays passed.

[0005] CN202211733446.6 discloses a laboratory spectrometer in which the linkage of the spherical curved crystal, sample and detector components and X-ray source on the dynamic Rowland circle during energy scanning is achieved by the precise linkage of four electric displacement stages. Therefore, the cost is relatively high and the linkage control program between each displacement stage is relatively complex.

[0006] CN 202211237248.0 discloses a multi-mode integrated switching platform and method for spectrometer signal reception. During energy scanning, although the linkage between the spherical curved crystal, sample and detector components, and X-ray source on the dynamic Rowland circle relies on single-axis drive, the position of the X-ray source continuously moves during the scanning process and is not fixed. Since the intensity and positional stability of the X-ray source's emitted beam are crucial for high-quality energy spectrum acquisition, high-power X-ray sources are inherently heavy (typically around 20 kg) and require circulating cooling water during operation. The circulating cooling water, driven by a water pump, generates vibrations with a certain amplitude and frequency as it flows through the X-ray source. If the X-ray source needs to move in real-time during spectral acquisition, it becomes even more difficult to ensure its vibrational stability, thus hindering the maintenance of its emitted beam intensity and positional stability. Summary of the Invention

[0007] To address the stability and other issues in the prior art, this invention provides a fixed single-axis driven energy scanning mechanism for X-ray sources.

[0008] The X-ray source fixed single-axis driven energy scanning mechanism according to the present invention includes an X-ray source and its support and adjustment mechanism, a spherical bending crystal assembly, a sample and detector assembly, a linkage mechanism, and a mounting base plate. The X-ray source and its support and adjustment mechanism are fixedly mounted on the mounting base plate. The spherical bending crystal assembly includes a spherical bending crystal and a displacement stage that allows the spherical bending crystal to move along the direction of the incident light. The sample and detector assembly is connected to the spherical bending crystal assembly through the linkage mechanism, so that the X-ray source and its support and adjustment mechanism, the spherical bending crystal assembly, and the sample and detector assembly are precisely linked in a Rowland circle configuration.

[0009] Preferably, the linkage mechanism includes a support assembly, a four-bar linkage, and a fixed mounting plate, wherein the spherical bent crystal is fixedly mounted on the support assembly, the sample and detector assembly is fixedly mounted on the fixed mounting plate, and the fixed mounting plate is movably connected to the support assembly through the four-bar linkage.

[0010] Preferably, the support assembly includes a first linear guide rail, a disc, a rectangular plate, a second linear guide rail, and a waist-shaped plate base. The first linear guide rail is fixed to the mounting base plate. The disc is linearly movable on the first linear guide rail via a slide block. The rectangular plate is rotatably mounted on the disc. The second linear guide rail is fixed to the rectangular plate. One end of the waist-shaped plate base is linearly movable on the second linear guide rail via a slide block. The other end of the waist-shaped plate base is rotatably mounted on the displacement stage via a bearing.

[0011] Preferably, the four-bar linkage includes a first waist-shaped connecting plate, a second waist-shaped connecting plate, a third waist-shaped connecting plate, and a fourth waist-shaped connecting plate. The first waist-shaped connecting plate and the third waist-shaped connecting plate are rotatably mounted on a bearing seat fixed to the base plate at the first pivot point. The third waist-shaped connecting plate and the fourth waist-shaped connecting plate are rotatably mounted on a support assembly at the second pivot point. The first waist-shaped connecting plate and the second waist-shaped connecting plate are rotatably mounted on the support assembly at the third pivot point. The second waist-shaped connecting plate and the fourth waist-shaped connecting plate are rotatably suspended at the fourth pivot point.

[0012] Preferably, the bearing housing is a "Z-shaped" bearing housing, and the third waist-shaped connecting plate is a "Z-shaped" connecting plate.

[0013] Preferably, the support assembly has a fixed bearing seat at the second pivot point, and the third and fourth waist-shaped connecting plates are rotatably mounted on the fixed bearing seat.

[0014] Preferably, the support assembly has a third linear guide rail, one end of the waist-shaped plate connecting seat is linearly movable on the third linear guide rail via a slide, and the first waist-shaped connecting plate and the second waist-shaped connecting plate are rotatably mounted on the other end of the waist-shaped plate connecting seat at the third pivot.

[0015] Preferably, the support assembly is fixed to a cylinder coaxially with the bearing, the spherical bent crystal is fixedly mounted on the cylinder, and the fixed mounting plate is rotatably mounted on the four-bar linkage at the fourth pivot and has a U-shaped groove, the U-shaped groove forming a small clearance fit with the surface of the cylinder.

[0016] Preferably, a disc-shaped shim is provided between the fixed mounting plate and the four-bar linkage.

[0017] Preferably, a rectangular connecting block is installed at one end of the fixed mounting plate with a U-shaped groove.

[0018] The X-ray source fixed single-axis driven energy scanning mechanism of the present invention, based on the Loland circle imaging principle, is used in the field of laboratory spectrometers. By precisely linking the XRD type X-ray source, spherical curved crystal, sample and detector components according to a certain Loland circle configuration, the absorption spectrum of different samples in the energy range corresponding to the Bragg angle of 54.5° to 85.5° can be acquired. Attached Figure Description

[0019] Figure 1 The principle of the Rowland circle configuration of the X-ray source fixed single-axis driven energy scanning mechanism according to the present invention is shown.

[0020] Figure 2 Show Figure 1 The optical path corresponding to the Bragg angle range of the Rowland circle.

[0021] Figure 3 This is a schematic diagram of the overall structure of a fixed single-axis driven energy scanning mechanism for an X-ray source according to a preferred embodiment of the present invention.

[0022] Figure 4 The installation of the displacement stage on the mounting base plate is shown.

[0023] Figure 5 This shows the installation of the linear guide on the mounting base plate.

[0024] Figure 6 The mounting of the waist-shaped plate base on the displacement stage and linear guide rail is shown.

[0025] Figure 7 The installation of the cylinder, fixed bearing housing, and linear guide rail on the waist-shaped plate base is shown.

[0026] Figure 8 This shows the mounting of the waist-shaped plate connector on the linear guide.

[0027] Figure 9 The installation of the waist-shaped connecting plate is shown.

[0028] Figure 10 This illustrates the mounting of the fixed mounting plate on the cylindrical and waist-shaped connecting plates.

[0029] Figure 11 The installation of the X-ray source and its support and adjustment mechanism, the spherical curved crystal assembly, and the sample and detector assembly is shown.

[0030] Figure 12 The optical path is shown when the Bragg angle is 54.5°.

[0031] Figure 13 The optical path is shown when the Bragg angle is 85.5°. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0033] According to the X-ray source fixed single-axis driven energy scanning mechanism of the present invention, based on the Loland circle imaging principle, a spherical curved crystal is used as the analytical crystal, and the corresponding Loland circle diameter is the radius of the analytical crystal. By fixing the position of the X-ray source (i.e., fixing the source point), the spherical curved crystal, sample and detector assembly are driven by a single axis (single electric displacement stage) to achieve energy spectrum acquisition within the energy range corresponding to the Bragg angle of 54.5° to 85.5°.

[0034] Compared to existing technologies that rely on precise linkage of electric displacement stages, this invention uses single-axis drive, which can significantly reduce costs and simplify the linkage control program.

[0035] Compared to existing technologies where the position of the X-ray source moves continuously during scanning, this invention fixes the position of the X-ray source based on single-axis drive. This makes it easier to maintain the intensity and positional stability of the emitted beam from the high-power X-ray source, thus laying a solid foundation for obtaining a high-quality energy spectrum.

[0036] Figure 1The principle of the Rowland circle configuration of the X-ray source fixed single-axis driven energy scanning mechanism according to the present invention is shown. From a top view perspective, the incident light 2 emitted from the X-ray source point 1 is monochromated by the spherical curved crystal 3 and focused reflected light 4. The X-ray transmitted light 6 that passes through the sample 5 is received by the first detector 7 (e.g., a silicon drift detector), and the X-ray scattered light 8 scattered by the sample 5 can be received by the second detector 9 (e.g., a silicon drift detector). The angle 12 between the incident light 2 at the spherical curved crystal 3 and the tangent 11 of the dynamic Rowland circle 10 (whose position changes constantly during energy scanning, but the relative positions of the source point 1, the spherical curved crystal 3, and the sample 5 must always be on this circle) is the Bragg angle. Changing this angle value and using spherical curved crystals 3 with different materials and index surfaces can change the energy used for scanning.

[0037] The commercial XRD source used in this embodiment has a large mass. To ensure good positional stability of the optical path during the operation of the energy scanning mechanism, the position of the XRD source is fixed (i.e., the position of the light source point 1 is fixed). The spherical curved crystal 3 is equipped with an electric high-precision displacement stage (not shown here) and drives the sample 5 and detector 7 through a linkage mechanism. The samples are precisely linked according to the Loran circle configuration described above to achieve the acquisition of absorption spectra of different samples within the energy range corresponding to the Bragg angle of 54.5° to 85.5°.

[0038] The optical path corresponding to the Bragg angle range is as follows: Figure 2 As shown, viewed from a top-down perspective, the incident light 2 emitted from light source point 1 maintains its direction. The spherical curved crystal corresponding to the 54.5° Bragg angle 13 is located at position 14, and its monochromatic focused reflected light 21 passes through the sample at position 22. At this time, the center of the dynamic Rowland circle 17 is located at position 18. The spherical curved crystal corresponding to the 85.5° Bragg angle 19 is located at position 20, and its monochromatic focused reflected light 15 passes through the sample at position 16. At this time, the center of the dynamic Rowland circle 23 is located at position 24.

[0039] like Figure 3As shown, the X-ray source fixed single-axis driven energy scanning mechanism according to the present invention includes an X-ray source and its support and adjustment mechanism 100, a spherical bending crystal assembly 200, a sample and detector assembly 300, a linkage mechanism 400, and a mounting base plate 26. The X-ray source and its support and adjustment mechanism 100 are fixedly mounted on the mounting base plate 26. The spherical bending crystal assembly 200 includes a spherical bending crystal 3 and a high-precision linear displacement stage (hereinafter referred to as "displacement stage") 25 that allows the spherical bending crystal 3 to move along the direction of the incident light 2. The sample and detector assembly 300 is connected to the spherical bending crystal assembly 200 through the linkage mechanism 400. The X-ray source and its support and adjustment mechanism 100, the spherical bending crystal assembly 200, and the sample and detector assembly 300 are precisely linked according to a Rowland circle configuration. It should be noted that the following section will focus on the structure and installation method of the linkage mechanism 400 and the overall layout of the energy scanning mechanism. The specific structures of the X-ray source and its support and adjustment mechanism 100, the spherical bending crystal assembly 200 and the sample and detector assembly 300 are similar to those in the prior art and will not be described in detail here.

[0040] like Figure 4 As shown, the displacement stage 25 is fixed on the mounting base plate 26, and the bearing seat 27 is fixed on the displacement stage 25, with a cross roller bearing 28 installed inside.

[0041] The linkage mechanism 400 includes a support assembly 401, such as Figure 5 As shown, the support assembly 401 includes a linear guide rail 4011, a slide block 4012, a disc 4013, a crossed roller bearing 4014, a rectangular plate 4015, and a linear guide rail 4016. The linear guide rail 4011 is fixed to the mounting base plate 26. The matching slide block 4012 is mounted on the linear guide rail 4011. The disc 4013 is fixed on the slide block 4012. The crossed roller bearing 4014 is mounted on the disc 4013. The rectangular plate 4015 is mounted on the crossed roller bearing 4014. The linear guide rail 4016 is fixed on the rectangular plate 4015, and the matching slide block 4012 is also mounted on it.

[0042] like Figure 6 As shown, the waist-shaped plate base 4017 is fixed to the cross roller bearing 28 and the uppermost slide 4012 of the support assembly 401 to complete the installation of the frame part of the linkage mechanism 400.

[0043] like Figure 7 As shown, a cylinder 4019 is fixed on the waist-shaped plate base 4017 at a position coaxial with the bearing 28, and a disc 4020 is fixed on it. A bearing seat 4021 is fixed in the middle area of ​​the waist-shaped plate base 4017, and a linear guide 4018 is fixed in the end area. A matching slide 4012 is installed on the linear guide 4018. The "Z-shaped" bearing seat 29 is also fixed on the mounting base 26.

[0044] like Figure 8As shown, one end of the waist-shaped plate connecting seat 4022 is fixed on the slide 4012 mounted on the linear guide rail 4018, and the other end is equipped with a cross roller bearing 4014. Both the bearing seat 4021 and the "Z-shaped" bearing seat 29 are equipped with cross roller bearings 4014.

[0045] like Figure 9 As shown, one end of the waist-shaped connecting plate 4023 is mounted on the crossed roller bearing 4014 on the "Z-shaped" bearing housing 29, and the other end is mounted on the crossed roller bearing 4014 on the waist-shaped plate connecting seat 4022. Cross roller bearings 4024 and 4025 are mounted on both ends of the upper surface of the waist-shaped connecting plate 4023, respectively. One end of the waist-shaped connecting plate 4029 is mounted on the crossed roller bearing 4014 on the bearing housing 4021. One end of the waist-shaped connecting plate 4026 is connected to the upper surface of the crossed roller bearing 4025, and the other ends of the waist-shaped connecting plates 4029 and 4026 are connected to the inner and outer rings of the crossed roller bearing 4028, respectively. A crossed roller bearing 4030 is mounted on the upper surface of the end of the waist-shaped connecting plate 4029 that is connected to the crossed roller bearing 4014. Both ends of the "Z-shaped" waist-shaped connecting plate 4027 are connected to the inner rings of the crossed roller bearings 4024 and 4030, respectively.

[0046] like Figure 10 As shown, a cross roller bearing 4031 is installed on the upper surface of the end of the waist-shaped connecting plate 4029 that is connected to the cross roller bearing 4028. A disc-shaped shim block 4032 is fixed on the upper surface of the bearing. A mounting plate 4033 is fixed on the upper surface of the disc-shaped shim block 4032. One end of the mounting plate 4033 has a U-shaped groove 30, which forms a small clearance fit with the surface 31 of the cylinder 4019. A rectangular connecting block 4034 is installed on the end of the mounting plate 4033 with the U-shaped groove 30, thereby completing the overall assembly of the linkage mechanism 400.

[0047] like Figure 11 As shown, the overall assembly of the energy scanning mechanism is completed by fixing the X-ray source and its support and adjustment mechanism 100 to the mounting base plate 26, fixing the spherical curved crystal assembly 200 to the disk 4020, and fixing the sample and detector assembly 300 to the mounting plate 4033.

[0048] From a top-down viewpoint, when the Bragg angle 32 is 54.5°, the incident light 34 emitted from the X-ray source 33, after being monochromated by the spherical curved crystal 35, is focused and reflected into the sample and detector assembly 300. Its optical path is as follows: Figure 12 As shown in the top view, when the Bragg angle 32 is 85.5°, the incident light 37 emitted from the X-ray source 33, after being monochromated by the spherical curved crystal 35, is focused and reflected into the sample and detector assembly 300. Its optical path is as follows: Figure 13 As shown.

[0049] The energy scanning mechanism provided by this invention has been described in detail above. The principle and structural composition of the energy scanning mechanism have been explained in this document. The above description is only for the purpose of helping to understand the method and core idea of ​​this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A single-axis driven energy scanning mechanism with a fixed X-ray source, characterized in that, The fixed single-axis driven energy scanning mechanism for the X-ray source includes an X-ray source and its support and adjustment mechanism (100), a spherical bending crystal assembly (200), a sample and detector assembly (300), a linkage mechanism (400), and a mounting base (26). The X-ray source and its support and adjustment mechanism (100) are fixedly mounted on the mounting base (26). The spherical bending crystal assembly (200) includes a spherical bending crystal (3) and a displacement stage (25) that allows the spherical bending crystal (3) to move along the direction of the incident light (2). The sample and detector assembly (300) is connected to the spherical bending crystal assembly (200) via the linkage mechanism (400), so that the X-ray source and its support and adjustment mechanism (100), the spherical bending crystal assembly (200), and the detector assembly (300) can move together. The sample and detector assembly (300) and the sample and detector assembly (200) are precisely linked according to the Loland circle configuration. The linkage mechanism (400) includes a support assembly (401), a four-bar linkage, and a fixed mounting plate (4033). The spherical bent crystal (3) is fixedly mounted on the support assembly (401), and the sample and detector assembly (300) is fixedly mounted on the fixed mounting plate (4033). The fixed mounting plate (4033) is movably connected to the support assembly (401) through the four-bar linkage. The support assembly (401) includes a first linear guide rail (4011), a disk (4013), a rectangular plate (4015), a second linear guide rail (4016), and a waist-shaped plate base (4017). A linear guide rail (4011) is fixed on a mounting base plate (26). A disc (4013) is linearly movable on the first linear guide rail (4011) via a slide block (4012). A rectangular plate (4015) is rotatably mounted on the disc (4013). A second linear guide rail (4016) is fixed on the rectangular plate (4015). One end of a waist-shaped plate base (4017) is linearly movable on the second linear guide rail (4016) via a slide block (4012). The other end of the waist-shaped plate base (4017) is rotatably mounted on a displacement stage (25) via a bearing (28). The four-bar linkage includes a first waist-shaped connecting plate (4023) and a second waist-shaped connecting plate (4026). The first waist-shaped connecting plate (4023) and the third waist-shaped connecting plate (4027) are rotatably mounted on the bearing seat (29) fixed on the base plate (26) at the first pivot point. The third waist-shaped connecting plate (4027) and the fourth waist-shaped connecting plate (4029) are rotatably mounted on the support assembly (401) at the second pivot point. The first waist-shaped connecting plate (4023) and the second waist-shaped connecting plate (4026) are rotatably mounted on the support assembly (401) at the third pivot point. The second waist-shaped connecting plate (4026) and the fourth waist-shaped connecting plate (4029) are rotatably suspended at the fourth pivot point.

2. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 1, characterized in that, The bearing housing (29) is a "Z-shaped" bearing housing, and the third waist-shaped connecting plate (4027) is a "Z-shaped" connecting plate.

3. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 1, characterized in that, The support assembly (401) has a fixed bearing housing (4021) at the second pivot, and a third waist-shaped connecting plate (4027) and a fourth waist-shaped connecting plate (4029) are rotatably mounted on the fixed bearing housing (4021).

4. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 1, characterized in that, The support assembly (401) has a third linear guide rail (4018), one end of the waist plate connecting seat (4022) is linearly movable on the third linear guide rail (4018) via a slide (4012), and the first waist plate connecting plate (4023) and the second waist plate connecting plate (4026) are rotatably mounted on the other end of the waist plate connecting seat (4022) at the third pivot.

5. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 1, characterized in that, The support assembly (401) is coaxial with the bearing (28) and a fixed cylinder (4019) is fixedly mounted on the cylinder (4019). The fixed mounting plate (4033) is rotatably mounted on the four-bar linkage at the fourth pivot and has a U-shaped groove (30). The U-shaped groove (30) and the surface (31) of the cylinder (4019) form a small clearance fit.

6. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 5, characterized in that, A disc-shaped shim (4032) is provided between the fixed mounting plate (4033) and the four-bar linkage.

7. The X-ray source fixed single-axis driven energy scanning mechanism according to claim 5, characterized in that, A rectangular connecting block (4034) is installed at one end of the fixed mounting plate (4033) with a U-shaped groove (30).

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