Light barrier

Abstract

The invention relates to a light barrier which comprises a supporting frame, a first baffle, a second baffle and a motor, the first baffle is fixed to the supporting frame, the motor is fixed to the first baffle, and an output shaft of the motor is connected with the second baffle so as to drive the second baffle to rotate relative to the first baffle; a plurality of first through holes are formed in the first baffle, a plurality of second through holes are formed in the second baffle, and the second baffle is arranged to enable any one of the second through holes to be aligned with one of the first through holes in the first baffle through rotation relative to the first baffle. According to the light barrier, the second baffle is driven by the motor to rotate relative to the first baffle, and the position of transmission light can be conveniently adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of optical elements, and more particularly to a light blocking plate. Background Art

[0002] Synchrotron radiation total scattering PDF (atomic pair distribution function) characterization is a characterization and analysis method that reveals the relative positions and spatial distributions of atoms in a material by obtaining the atomic spacing distribution function of the material. When X-rays enter a material, they scatter with the atoms in the material. These scattered photons or neutrons will scatter at different angles and directions and eventually be received by the detector.

[0003] like Figure 1 As shown, after the parallel synchrotron radiation light 10 is drawn out, based on the wave-particle duality of light, before entering the sample 50, it is easy to form a number of stray lights after interacting with dust in the air, which will affect the collection of the final scattering ring; therefore, it is necessary to arrange a light shield 30 before the sample 50 to improve the quality of light. The light shield 30 is mainly made of lead plate, and a small hole 20 is opened in the middle to constrain the spot size and block other stray lights. When the transmitted light 40 interacts with the sample 50, full scattering will occur and multiple scattered light cones 60 will be formed, and multiple images of scattered rings 80 will be formed on the two-dimensional flat panel detector 70. The analysis of the number and diameter of the scattering rings 80 will determine the success of the experiment. When the spatial positions of the transmitted light 40, the sample 50 and the detector 70 are different, different experimental analysis results will be produced. In the actual experimental process, based on factors such as the large size and heavy weight of the detector 70 and ensuring data collection accuracy, the spatial position of the detector 70 is usually fixed, and the collection of different scattering ring images is achieved by adjusting the positions of the sample 50 and the transmitted light 40 relative to the detector 70.

[0004] In order to adjust the position of the sample 50 and the transmitted light 40 relative to the detector 70, a plurality of holes are usually provided on the light blocking plate 30, each hole having a different position, and each hole corresponds to a specific position of a specific transmitted light 40. When light needs to pass through a certain hole, a patch plate needs to be additionally fixed on the light blocking plate 30 to block other holes. Therefore, the patch plate needs to be disassembled and assembled every time the position of the transmitted light 40 needs to be adjusted, which is very inconvenient. Summary of the invention

[0005] The object of the present invention is to provide a light blocking plate to conveniently adjust the position of transmitted light.

[0006] Based on the above purpose, the present invention provides a light baffle, including a support frame, a first baffle, a second baffle and a motor, wherein the first baffle is fixed on the support frame, the motor is fixed on the first baffle, and the output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle; a plurality of first through holes are provided on the first baffle, a plurality of second through holes are provided on the second baffle, and the second baffle is configured to align any one of the second through holes with one of the first through holes on the first baffle by rotating relative to the first baffle.

[0007] Further, the second baffle is located on the front side of the first baffle, the motor is located on the back side of the first baffle, and the output shaft of the motor passes through the first baffle and is connected to the second baffle;

[0008] There is a gap between the second baffle and the first baffle;

[0009] The first baffle is square, the second baffle is circular, and the center of the second baffle is connected to the output shaft;

[0010] The first baffle and the second baffle are both structures composed of two aluminum plates sandwiching a lead plate.

[0011] Further, when one of the second through holes is aligned with one of the first through holes, the remaining second through holes are blocked by the first baffle, and the remaining first through holes are blocked by the first baffle.

[0012] Furthermore, at least one of the first through holes is distributed on a first circumference, and the center of the first circle is the connection point between the output shaft and the first baffle; at least one of the second through holes is distributed on a second circle, and the center of the second circle is the connection point between the output shaft and the second baffle; the radius of the first circle is the same as the radius of the second circle; and the size of the first through hole is larger than the size of the second through hole.

[0013] Further, there are multiple second through holes located on the second circumference, and the sizes of the second through holes are different; or

[0014] The second through holes located on the second circumference include a plurality of groups of holes, each group of holes includes a plurality of holes of different sizes, and the groups of holes are arranged at intervals along the second circumference.

[0015] Furthermore, there are a plurality of first through holes located on the first circumference, and the first through holes are arranged at intervals along the first circumference.

[0016] Furthermore, at least one other of the first through holes is located on a third circle, and the center of the third circle is the same as the center of the first circle; at least one other of the second through holes is located on a fourth circle, and the center of the fourth circle is the same as the center of the second circle; and the radius of the third circle is the same as the radius of the fourth circle.

[0017] Further, there are multiple second through holes located on the fourth circumference, and the sizes of the second through holes are different; or

[0018] The second through holes located on the fourth circumference include multiple groups of holes, each group of holes includes multiple holes of different sizes, and the groups of holes are arranged at intervals along the fourth circumference.

[0019] Furthermore, there are a plurality of first through holes located on the third circumference, and the first through holes are arranged at intervals along the third circumference.

[0020] Further, the first through holes located on the first circumference and the third circumference are radially staggered with each other, and the second through holes located on the second circumference and the fourth circumference are radially staggered with each other.

[0021] The light baffle of the present invention can conveniently adjust the position of the transmitted light by driving the second baffle plate to rotate relative to the first baffle plate through a motor. Combined with the adjustment of the sample position, the needs of collecting data of different scattering rings can be easily met. The rotation of the second baffle plate driven by the motor can also quickly adjust the size of the transmitted light spot, thereby optimizing the imaging parameters of samples of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the principle of the existing synchrotron radiation total scattering PDF characterization experiment;

[0023] Figure 2 is a schematic structural diagram of a light-blocking plate according to an embodiment of the present invention from a front perspective;

[0024] Figure 3 is a front view of a light blocking plate according to an embodiment of the present invention;

[0025] Figure 4 FIG. 4 is a rear view of a light blocking plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0027] like Figure 2 , Figure 3 and Figure 4As shown, an embodiment of the present invention provides a light baffle, which includes a support frame 100, a first baffle 200, a second baffle 300 and a motor 400, wherein the first baffle 200 is fixed on the support frame 100, the motor 400 is fixed on the first baffle 200, and the output shaft 410 of the motor 400 is connected to the second baffle 300 to drive the second baffle 300 to rotate relative to the first baffle 200; a plurality of first through holes 210 are provided on the first baffle 200, and a plurality of second through holes 310 are provided on the second baffle 300, and through the rotation of the second baffle 300 relative to the first baffle 200, any one of the second through holes 310 can be connected to the first baffle 200. The second baffle 300 and the first baffle 200 are sequentially arranged along the light path direction. When in use, the second baffle 300 is closer to the light source, and the synchrotron radiation light can be vertically incident on the second baffle 300 and the first baffle 200. When there is no second through hole 310 aligned with the first through hole 210, the first baffle 200 will block each second through hole 310, and the second baffle 300 will block each first through hole 210, so that the synchrotron radiation light cannot pass through the light baffle. When a second through hole 310 is aligned with a first through hole 210, the synchrotron radiation light can pass through the second through hole 310 and the first through hole 210 in sequence, thereby forming a transmitted light. That is to say, when and only when there is a second through hole 310 aligned with the first through hole 210, the synchrotron radiation light can pass through the light baffle and form a transmitted light. Therefore, the spot size and position of the transmitted light are determined by the second through hole 310 and the first through hole 210. The second through hole 310 at any position can be aligned with one of the first through holes 210 by rotating the second baffle 300, thereby adjusting the position of the transmitted light. That is, the present invention only needs to drive the second baffle 300 to rotate by the motor 400 to adjust the position of the transmitted light without disassembling the patch plate, which is very convenient.

[0028] In some embodiments, the support frame 100 may be made of stainless steel to facilitate magnetic fixation. At the same time, the material has a high density, which can make the light baffle as a whole have a higher translation stability.

[0029] In some embodiments, the second baffle 300 is located on the front side of the first baffle 200 (i.e., the side facing the light source), and the motor 400 is located on the back side of the first baffle 200 (i.e., the side facing away from the light source). The output shaft 410 of the motor 400 passes through the first baffle 200 and is connected to the second baffle 300. When the motor 400 rotates, the second baffle 300 can rotate with the output shaft 410, while the first baffle 200 remains stationary, so the second baffle 300 can rotate relative to the first baffle 200.

[0030] In some embodiments, there is a gap between the second baffle plate 300 and the first baffle plate 200 to prevent the second baffle plate 300 from rubbing against the first baffle plate 200 during the rotation process, thereby avoiding wear between the two.

[0031] In some embodiments, the first baffle 200 is formed in a square shape, the second baffle 300 is formed in a circular shape, and the center of the second baffle 300 is formed as the rotation center of the second baffle 300, that is, the connection point between the output shaft 410 and the second baffle 300 is its center.

[0032] In some embodiments, at least one of the first through holes 210 is distributed on the first circle 220, the center of the first circle 220 is O1, and the center O1 is the connection point between the output shaft 410 and the first baffle 200; at least one of the second through holes 310 is distributed on the second circle 320, the center of the second circle 320 is O2, and the center O2 is the connection point between the output shaft 410 and the second baffle 200 (when the second baffle 200 is circular, O2 is its center); the radius of the first circle 220 is the same as the radius of the second circle 320, so when projected on the optical path, the first circle 220 will coincide with the second circle 320, so when the second through hole 310 on the second circle 320 is aligned with the first through hole 210 on the first circle 220, the light can pass through the second through hole 310 and the first through hole 210 in sequence, thereby forming transmitted light through the light blocking plate.

[0033] In some embodiments, the size of the first through hole 210 is greater than the size of the second through hole 310 , so that the spot size of the transmitted light is determined by the size of the second through hole 310 .

[0034] In some embodiments, there are multiple second through holes 310 located on the second circumference 320 , and the sizes of the multiple second through holes 310 are different, thereby achieving transmission of light with spots of different sizes.

[0035] In some embodiments, the second through hole 310 located on the second circle 320 includes multiple groups of holes, each group of holes includes multiple holes of different sizes (the holes can be arranged adjacent to each other), and each group of holes is arranged at intervals along the second circle 320. In this way, the size of the light spot can be flexibly adjusted according to experimental requirements, which is more efficient.

[0036] In some embodiments, there may be a plurality of first through holes 210 on the first circumference 220 and spaced apart along the first circumference 220 , so that when the second through hole 310 is aligned with the first through hole 210 by rotating the second baffle 300 , the rotation stroke may be reduced.

[0037] In some embodiments, each first through hole 210 and each second through hole 310 can be arranged so that at any time, only one first through hole 210 and one second through hole 310 can be aligned with each other, thereby avoiding the transmitted light at different positions irradiating the sample at the same time and affecting the experimental results.

[0038] In some embodiments, at least one other of the first through holes 210 is located on the third circle 230, and the center of the third circle 230 is O1; at least one other of the second through holes 220 is located on the fourth circle 330, and the center of the fourth circle 330 is O2; the radius of the third circle 230 is the same as the radius of the fourth circle 330, and the radius of the third circle 230 is greater than the radius of the first circle 210; thus, when projected on the light path, the third circle 230 will coincide with the fourth circle 330, so when the second through hole 310 on the fourth circle 330 is aligned with the first through hole 210 on the second circle 230, light can pass through the second through hole 310 and the first through hole 210 in sequence, thereby forming transmitted light passing through the light blocking plate.

[0039] In some embodiments, there are multiple second through holes 310 located on the fourth circumference 330 , and the sizes of the multiple second through holes 310 are different, thereby achieving transmission of light with spots of different sizes.

[0040] In some embodiments, the second through holes 310 located on the fourth circumference 330 include multiple groups of holes, each group of holes includes multiple holes of different sizes, and the groups of holes are arranged at intervals along the fourth circumference 330 .

[0041] In some embodiments, there may be multiple first through holes 210 on the third circumference 230 and spaced apart along the third circumference 230 , so that when the second through holes 310 are aligned with the first through holes 210 by rotating the second baffle 300 , the rotation stroke may be reduced.

[0042] In some embodiments, the first through holes 210 on the first circumference 220 and the third circumference 230 are radially offset from each other, and the second through holes 310 on the second circumference 320 and the fourth circumference 330 are radially offset from each other, so that when the first through holes 210 on the first circumference 220 are aligned with the second through holes 320 on the second circumference 320, the first through holes 210 on the third circumference 230 are also aligned with the second through holes 310 on the fourth circumference 330. Since the radii of the first circumference 220 and the third circumference 230 are different, when their first through holes 210 are aligned with their respective corresponding second through holes 310, the positions of the transmitted light formed are also different.

[0043] In some embodiments, the first baffle 200 and the second baffle 300 are both structures of two aluminum plates sandwiching a lead plate, that is, the lead plate is sandwiched between two lead plates to form a "sandwich" structure. The thickness of the aluminum plate is 1.5 mm, and the thickness of the lead plate is matched and selected according to the intensity of the synchrotron radiation light. Pure lead is a material with high density but soft strength. Large-sized plate-shaped lead materials are often easy to bend, and direct contact with lead materials is harmful to human health. With the help of two layers of aluminum encapsulated on the outside of the lead plate, the overall strength is enhanced and direct contact with the lead material is avoided. Compared with the direct use of pure lead plates, the use of aluminum will greatly reduce the overall mass of the equipment, which is beneficial to the transportation and installation of the equipment.

[0044] The light baffle of the embodiment of the present invention is placed between the synchrotron radiation light source and the sample when in use, and the parallel synchrotron radiation light is vertically irradiated on the first baffle 200 and the second baffle 300. The second baffle 300 is driven to rotate by the motor 400 to align the second through hole 310 of the second baffle 300 with the first through hole 210 at the preset position of the first baffle 200, so that the synchrotron radiation light passes through the second through hole 310 and the first through hole 210 in sequence to form transmitted light, and then the sample can be moved into the transmitted light, and the scattered ring data can be collected on the detector; then the second baffle 300 is rotated by the motor 400, and the second through holes 310 of other sizes of the second baffle 300 are aligned with the first through holes 210 of the first baffle 200, so that the scattered ring data of other sizes can be collected; or, the second baffle 300 is rotated by the motor 400, and the second through holes 310 of the second baffle 300 are aligned with the first through holes 210 at other positions of the first baffle 200, so as to collect the scattered ring data formed by the transmitted light at other positions. Therefore, by rotating the motor 400 and moving the sample, the position of the sample and the transmitted light relative to the detector can be adjusted to achieve the collection of different scattering ring images.

[0045] The light baffle of the embodiment of the present invention can conveniently adjust the position of the transmitted light by driving the second baffle 300 to rotate relative to the first baffle 200 through the motor 400. Combined with the adjustment of the sample position, the needs of collecting data of different scattering rings can be easily met. The rotation of the second baffle 300 driven by the motor 400 can also quickly adjust the size of the transmitted light spot, so as to optimize the imaging parameters of samples of different sizes. Compared with the existing method of disassembling and assembling patch plates, the present invention greatly improves the efficiency, has a simple structure and a low manufacturing cost. In addition to being used in synchrotron radiation total scattering PDF characterization experiments, it can also be used in any other suitable optical experiments, such as scattering or diffraction experiments.

[0046] The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above embodiment of the present invention can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the description of the present invention fall within the scope of protection of the claims of the present invention. The contents not described in detail in the present invention are all conventional technical contents.

Claims

1. A light barrier, characterized in that: It includes a support frame, a first baffle, a second baffle and a motor, the first baffle is fixed on the support frame, the motor is fixed on the first baffle, and the output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle; a plurality of first through holes are provided on the first baffle, a plurality of second through holes are provided on the second baffle, and the second baffle is configured to align any one of the second through holes with one of the first through holes on the first baffle by rotating relative to the first baffle.

2. The light barrier according to claim 1, characterized in that: The second baffle is located on the front side of the first baffle, the motor is located on the back side of the first baffle, and the output shaft of the motor passes through the first baffle and is connected to the second baffle; There is a gap between the second baffle and the first baffle; The first baffle is square, the second baffle is circular, and the center of the second baffle is connected to the output shaft; The first baffle and the second baffle are both structures composed of two aluminum plates sandwiching a lead plate.

3. The light barrier according to claim 1, characterized in that: When one of the second through holes is aligned with one of the first through holes, the remaining second through holes are blocked by the first baffle plate, and the remaining first through holes are blocked by the first baffle plate.

4. The light barrier according to claim 1, characterized in that: At least one of the first through holes is distributed on a first circumference, and the center of the first circle is the connection point between the output shaft and the first baffle; at least one of the second through holes is distributed on a second circle, and the center of the second circle is the connection point between the output shaft and the second baffle; the radius of the first circle is the same as the radius of the second circle; the size of the first through hole is larger than the size of the second through hole.

5. The light barrier according to claim 4, characterized in that: There are multiple second through holes on the second circumference, and the sizes of the second through holes are different; or The second through holes located on the second circumference include a plurality of groups of holes, each group of holes includes a plurality of holes of different sizes, and the groups of holes are arranged at intervals along the second circumference.

6. The light barrier according to claim 4, characterized in that: There are a plurality of first through holes located on the first circumference and arranged at intervals along the first circumference.

7. The light barrier according to claim 4, characterized in that: At least one other of the first through holes is located on a third circle, and the center of the third circle is the same as the center of the first circle; at least one other of the second through holes is located on a fourth circle, and the center of the fourth circle is the same as the center of the second circle; the radius of the third circle is the same as the radius of the fourth circle.

8. The light barrier according to claim 7, characterized in that: There are multiple second through holes located on the fourth circumference, and the sizes of the second through holes are different; or The second through holes located on the fourth circumference include multiple groups of holes, each group of holes includes multiple holes of different sizes, and the groups of holes are arranged at intervals along the fourth circumference.

9. The light barrier according to claim 7, characterized in that: There are a plurality of first through holes located on the third circumference and arranged at intervals along the third circumference.

10. The light barrier according to claim 7, characterized in that: The first through holes located on the first circumference and the third circumference are radially staggered with each other, and the second through holes located on the second circumference and the fourth circumference are radially staggered with each other.

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