light barrier

Abstract

This invention relates to a light-blocking plate, comprising a support frame, a first baffle, a second baffle, and a motor. The first baffle is fixed to the support frame, and the motor is fixed to the first baffle. The output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle. The first baffle has a plurality of first through holes, and the second baffle has a plurality of second through holes. The second baffle is configured such that, by rotating relative to the first baffle, any one of the second through holes aligns with one of the first through holes on the first baffle. The light-blocking plate of this invention, by driving the second baffle to rotate relative to the first baffle via a motor, allows for convenient adjustment of the position of transmitted light.

Description

Technical Field

[0001] This invention relates to the field of optical element technology, and more specifically to a light-blocking plate. Background Technology

[0002] Synchrotron radiation total scattering (PDF) characterization is a characterization and analysis method that reveals the relative positions and spatial distribution of atoms in a substance by obtaining the interatomic spacing distribution function. When X-rays are incident on a substance, they are scattered by the atoms in the substance. These scattered photons or neutrons are scattered out at different angles and directions and are eventually received by the detector.

[0003] like Figure 1 As shown, after the parallel synchrotron radiation light 10 is extracted, based on the wave-particle duality of light, it easily forms several stray lights after interacting with dust in the air before it is incident on the sample 50, which will affect the acquisition of the final scattering rings. Therefore, a light-blocking plate 30 needs to be placed in front of the sample 50 to improve the quality of the light. The light-blocking plate 30 is mainly made of lead plate, with a small hole 20 in the middle to constrain the size of the light spot and block other stray lights. When the transmitted light 40 interacts with the sample 50, total scattering occurs and multiple scattering cones 60 are formed. Multiple scattering rings 80 will be formed on the two-dimensional flat panel detector 70. 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 results will be produced. In actual experiments, due to the large size and heavy weight of the detector 70 and the need to ensure data acquisition accuracy, the spatial position of the detector 70 is usually fixed. By adjusting the position of the sample 50 and the transmitted light 40 relative to the detector 70, different scattering ring images can be acquired.

[0004] In order to adjust the position of sample 50 and transmitted light 40 relative to detector 70, multiple holes are usually set on light-blocking plate 30. Each hole is in a different position and corresponds to a specific position of transmitted light 40. When it is necessary to allow light to pass through a certain hole, a patch plate needs to be fixed on light-blocking plate 30 to block other holes. Therefore, the patch plate needs to be removed and installed every time the position of transmitted light 40 needs to be adjusted, which is very inconvenient. Summary of the Invention

[0005] The purpose of this invention is to provide a light-blocking plate to facilitate the adjustment of the position of transmitted light.

[0006] To achieve the above objectives, the present invention provides a light-blocking plate, comprising a support frame, a first baffle, a second baffle, and a motor. The first baffle is fixed on the support frame, and the motor is fixed on the first baffle. The output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle. The first baffle is provided with a plurality of first through holes, and the second baffle is provided with a plurality of second through holes. The second baffle is configured such that, by rotating relative to the first baffle, any one of the second through holes aligns with one of the first through holes on the first baffle.

[0007] Furthermore, the second baffle is located on the front of the first baffle, the motor is located on the back 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] Both the first baffle and the second baffle are constructed from two aluminum plates sandwiching a lead plate.

[0011] Furthermore, 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, the center of the first circumference being the connection point between the output shaft and the first baffle; at least one of the second through holes is distributed on a second circumference, the center of the second circumference being the connection point between the output shaft and the second baffle; the radius of the first circumference and the radius of the second circumference are the same; the size of the first through hole is larger than the size of the second through hole.

[0013] Furthermore, there are multiple second through holes located on the second circumference, each with a different size; or

[0014] The second through hole located on the second circumference includes multiple sets of holes, each set of holes including multiple holes of different sizes, and the sets of holes are spaced apart along the second circumference.

[0015] Furthermore, there are multiple first through holes located on the first circumference, and they are spaced apart along the first circumference.

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

[0017] Furthermore, there are multiple second through holes located on the fourth circumference, and each hole has a different size; or

[0018] The second through hole located on the fourth circumference includes multiple sets of holes, each set of holes including multiple holes of different sizes, and the sets of holes are spaced apart along the fourth circumference.

[0019] Furthermore, there are multiple first through holes located on the third circumference, and they are spaced apart along the third circumference.

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

[0021] The light-blocking plate of the present invention allows for convenient adjustment of the position of transmitted light by rotating the second baffle relative to the first baffle via a motor. Combined with the adjustment of the sample position, it can easily meet the data acquisition needs of different scattering rings. Furthermore, the rotation of the second baffle via the motor can also quickly adjust the size of the transmitted light spot, thereby optimizing the imaging parameters for samples of different sizes. Attached Figure Description

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

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

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

[0025] Figure 4 This is a rear view of a light-blocking plate according to an embodiment of the present invention. Detailed Implementation

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

[0027] like Figure 2 , Figure 3 and Figure 4As shown, this embodiment of the invention provides a light-blocking plate, which includes a support frame 100, a first baffle 200, a second baffle 300, and a motor 400. The first baffle 200 is fixed on the support frame 100, and the motor 400 is fixed on the first baffle 200. 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. The first baffle 200 has a plurality of first through holes 210, and the second baffle 300 has a plurality of second through holes 310. By rotating 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. One of the first through holes 210 is aligned with the light source. The second baffle 300 and the first baffle 200 are arranged sequentially along the optical path. In use, the second baffle 300 is closer to the light source, and synchrotron radiation can be incident perpendicularly on the second baffle 300 and the first baffle 200. When no second through hole 310 is 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 cannot pass through the light-blocking plate. When a second through hole 310 is aligned with a first through hole 210, the synchrotron radiation can pass through the second through hole 310 and the first through hole 210 in sequence, thereby forming transmitted light. That is to say, synchrotron radiation can pass through the light-blocking plate and form transmitted light only when there is a second through hole 310 aligned with the first through hole 210. Therefore, the size and position of the transmitted light spot are determined by the second through hole 310 and the first through hole 210. By rotating the second baffle 300, the second through hole 310 at any position can be aligned with one of the first through holes 210, thereby adjusting the position of the transmitted light. That is, the present invention only requires the second baffle 300 to be driven to rotate by the motor 400 to achieve the adjustment of the transmitted light position, without the need to disassemble or assemble the patch plate, which is very convenient.

[0028] In some embodiments, the support frame 100 may be made of stainless steel, which is easy to fix magnetically. At the same time, the material has a high density, which can give the light-blocking plate high translational stability.

[0029] In some embodiments, the second baffle 300 is located on the front side (i.e., the side facing the light source) of the first baffle 200, and the motor 400 is located on the back side (i.e., the side facing away from the light source) of the first baffle 200. 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. Therefore, the second baffle 300 can rotate relative to the first baffle 200.

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

[0031] In some embodiments, the first baffle 200 is formed as a square, the second baffle 300 is formed as a circle, 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 circumference 220, the center of the first circumference 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 circumference 320, the center of the second circumference 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 circumference 220 is the same as the radius of the second circumference 320, so that when projection is performed on the optical path, the first circumference 220 will coincide with the second circumference 320. Therefore, when the second through hole 310 on the second circumference 320 is aligned with the first through hole 210 on the first circumference 220, 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.

[0033] In some embodiments, the size of the first through hole 210 is larger than the size of the second through hole 310, so that the size of the transmitted light spot will be 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 enabling the transmission of light with different sized light spots.

[0035] In some embodiments, the second through hole 310 located on the second circumference 320 includes multiple sets of holes, each set of holes including multiple holes of different sizes (each hole can be arranged adjacent to each other), and each set of holes is spaced apart along the second circumference 320, so that the size of the light spot can be flexibly adjusted according to experimental needs, and the efficiency is higher.

[0036] In some embodiments, there may be multiple first through holes 210 located on the first circumference 220, which are spaced apart along the first circumference 220. In this way, when the second through hole 310 is aligned with the first through hole 210 by rotating the second baffle 300, the rotation stroke can be reduced.

[0037] In some embodiments, each first through hole 210 and each second through hole 310 can be configured such that at any time only one first through hole 210 and one second through hole 310 are aligned with each other, thereby avoiding the influence of transmitted light from different positions on the sample at the same time on the experimental results.

[0038] In some embodiments, at least one of the first through holes 210 is located on the third circumference 230, the center of the third circumference 230 being O1; at least one of the second through holes 220 is located on the fourth circumference 330, the center of the fourth circumference 330 being O2; the radius of the third circumference 230 is the same as the radius of the fourth circumference 330, and the radius of the third circumference 230 is larger than that of the first circumference 210; thus, when projection is made on the optical path, the third circumference 230 will coincide with the fourth circumference 330. Therefore, when the second through hole 310 on the fourth circumference 330 is aligned with the first through hole 210 on the second circumference 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 enabling the transmission of light spots of different sizes.

[0040] In some embodiments, the second through hole 310 located on the fourth circumference 330 includes multiple sets of holes, each set of holes including multiple holes of different sizes, and the sets of holes are spaced apart along the fourth circumference 330.

[0041] In some embodiments, there may be multiple first through holes 210 located on the third circumference 230, which are spaced apart along the third circumference 230. In this way, when the second through hole 310 is aligned with the first through hole 210 by rotating the second baffle 300, the rotation stroke can be reduced.

[0042] In some embodiments, the first through holes 210 located on the first circumference 220 and the third circumference 230 are radially misaligned, and the second through holes 310 located on the second circumference 320 and the fourth circumference 330 are radially misaligned. This avoids the first through hole 210 on the first circumference 220 from aligning with the second through hole 320 on the second circumference 320, and vice versa. Since the radii of the first circumference 220 and the third circumference 230 are different, the positions of the transmitted light formed when their first through holes 210 are aligned with their respective second through holes 310 are also different.

[0043] In some embodiments, both the first baffle 200 and the second baffle 300 are structures consisting of two aluminum plates sandwiching a lead plate, forming a "sandwich" structure. The aluminum plate is 1.5 mm thick, and the lead plate thickness is selected to match the intensity of synchrotron radiation. Pure lead, as a dense but soft material, is prone to bending when large-sized sheet-like lead materials are used, and direct contact with lead is harmful to human health. By encapsulating the lead plate with two layers of aluminum, the overall strength is enhanced, and direct contact with lead is avoided. Compared to using pure lead plates directly, the use of aluminum significantly reduces the overall weight of the equipment, facilitating transportation and installation.

[0044] In this embodiment of the invention, the light-blocking plate is placed between the synchrotron radiation source and the sample. Parallel synchrotron radiation perpendicularly illuminates the first baffle 200 and the second baffle 300. The second baffle 300 is rotated by the motor 400, aligning the second through-hole 310 of the second baffle 300 with the first through-hole 210 at a preset position in the first baffle 200. This allows the synchrotron radiation to pass through the second through-hole 310 and the first through-hole 210 sequentially, forming transmitted light. The sample can then be moved into the transmitted light, and scattering ring data can be collected on the detector. Alternatively, the second baffle 300 can be rotated by the motor 400, aligning other sizes of second through-holes 310 of the second baffle 300 with the first through-holes 210 of the first baffle 200, to collect scattering ring data of other sizes. Or, the second baffle 300 can be rotated by the motor 400, aligning the second through-hole 310 of the second baffle 300 with other positions of the first through-holes 210 of the first baffle 200, to collect scattering ring data formed by transmitted light at other positions. Therefore, by rotating the motor 400 and moving the sample, the position of the sample and transmitted light relative to the detector can be adjusted, thereby enabling the acquisition of images of different scattering rings.

[0045] The light-blocking plate in this embodiment of the invention, driven by a motor 400 to rotate a second baffle 300 relative to a first baffle 200, allows for convenient adjustment of the transmitted light position. Combined with sample position adjustment, it easily meets the data acquisition requirements of different scattering rings. The rotation of the second baffle 300 driven by the motor 400 also allows for rapid adjustment of the transmitted light spot size, optimizing imaging parameters for samples of different sizes. Compared to existing patch-and-disassemble methods, this invention significantly improves efficiency, has a simple structure, and low manufacturing cost. Besides its application in synchrotron radiation total scattering (PDF) characterization experiments, it can also be applied to any other suitable optical experiments, such as scattering or diffraction experiments.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. That is, all simple and equivalent changes and modifications made based on the claims and description of this invention fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A light-blocking plate, characterized in that, The device includes a support frame, a first baffle, a second baffle, and a motor. The first baffle is fixed to the support frame, and the motor is fixed to the first baffle. The output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle. The first baffle has a plurality of first through holes, and the second baffle has a plurality of second through holes. The second baffle is configured such that any one of the second through holes aligns with one of the first through holes on the first baffle through rotation relative to the first baffle. The second baffle is located on the front of the first baffle, the motor is located on the back 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; Both the first baffle and the second baffle are constructed from two aluminum plates sandwiching a lead plate. 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.

2. The light-blocking plate according to claim 1, characterized in that, At least one of the first through holes is distributed on a first circumference, the center of which 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 circumference, the center of which is the connection point between the output shaft and the second baffle; the radius of the first circumference and the radius of the second circumference are the same; the size of the first through hole is larger than the size of the second through hole.

3. The light-blocking plate according to claim 2, characterized in that, There are multiple second through holes located on the second circumference, and each hole has a different size; or The second through hole located on the second circumference includes multiple sets of holes, each set of holes including multiple holes of different sizes, and the sets of holes are spaced apart along the second circumference.

4. The light-blocking plate according to claim 2, characterized in that, There are multiple first through holes located on the first circumference, and they are spaced apart along the first circumference.

5. The light-blocking plate according to claim 2, characterized in that, At least one of the first through holes is located on a third circumference, the center of which is the same as the center of the first circumference; at least one of the second through holes is located on a fourth circumference, the center of which is the same as the center of the second circumference; the radius of the third circumference is the same as the radius of the fourth circumference.

6. The light-blocking plate according to claim 5, characterized in that, There are multiple second through holes located on the fourth circumference, and each hole has a different size; or The second through hole located on the fourth circumference includes multiple sets of holes, each set of holes including multiple holes of different sizes, and the sets of holes are spaced apart along the fourth circumference.

7. The light-blocking plate according to claim 5, characterized in that, There are multiple first through holes located on the third circumference, and they are spaced apart along the third circumference.

8. The light-blocking plate according to claim 5, characterized in that, The first through holes located on the first circumference and the third circumference are radially offset from each other, and the second through holes located on the second circumference and the fourth circumference are radially offset from each other.

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