Sample collimation method and device for neutron scattering rheological experiment

Abstract

The invention provides a sample collimation method and device for a neutron scattering rheological experiment, an adjusting table comprises a motion module and a diaphragm assembly, the diaphragm assembly is arranged on the motion module, and the motion module can adjust the position of the diaphragm assembly in a space, so that neutrons or laser passing through the diaphragm assembly can accurately hit a sample on a sample table. The sample front sight assembly comprises a front sight, a cross-shaped slit is formed in the center of the front sight, two slits are formed in the two opposite sides of the cross-shaped slit in the front sight respectively, and the slits in the two sides of the cross-shaped slit are parallel to one of the cross-shaped slits. And the cross point of the cross slit is used for determining the center height of the sample and the middle position of the sample cylinder. The slits on the two sides of the cross slit are used for determining the installation position of the rheometer. According to the device, the sample position and the emission angle of the neutron beam can be accurately collimated, as many neutrons are hit on the sample as possible, and the experiment effect is also improved.

Description

Technical Field

[0001] The invention relates to the technical field of neutron scattering rheological experiments, and in particular to a sample alignment method and device for neutron scattering rheological experiments. Background Art

[0002] In the field of materials science, in order to study the microstructure of materials, people often place samples in special sample environment equipment and use neutron scattering to observe the physical properties and phase changes of materials under different environmental conditions. The special sample environment in the experimental process is usually generated by various special equipment. Rheological measurement is an effective method to observe the internal structure of polymer materials. Through the response of molecular chains of different scales in polymer materials such as plastics, rubbers, and resins, the molecular weight and molecular weight distribution of polymer materials can be characterized, which can quickly, easily and effectively perform quality inspection and quality control of raw materials, intermediate products and final products.

[0003] Rheometer assisted by neutron scattering spectrometer can effectively realize in-situ measurement of the micro-nano structure of soft matter macromolecular solution under flow field and reveal its evolutionary dynamics process, thereby realizing in-situ characterization of multi-level structure, rheological properties and other properties of soft matter, finding out the intrinsic relationship between structure and properties, and laying a solid experimental foundation for establishing the rheological constitutive relationship and non-equilibrium dynamics (mesoscopic) theory of soft matter macromolecular solution.

[0004] In the related technology, when the rheometer is used on a neutron spectrometer, the sample position cannot be accurately aligned with the neutron beam. In addition, since the neutron beam has a certain emission range when it is emitted, there are stray neutrons when the neutrons are emitted. The stray neutrons cannot be concentrated on the sample, which not only wastes neutrons but also affects the experimental results. Summary of the invention

[0005] The present application provides a sample alignment method and device for neutron scattering rheological experiments. The sample alignment method uses a sample alignment device, which can accurately align the sample position and the emission angle of the neutron beam when the rheometer is applied to a neutron spectrometer. At the same time, the neutron beam can also be focused so that as many neutrons as possible hit the sample, which saves neutrons and improves the experimental effect.

[0006] According to the first aspect of the present application, an embodiment provides a sample alignment device for neutron scattering rheological experiments, comprising: a laser emitting assembly for emitting laser; an adjustment platform for being arranged between the laser emitting assembly and the sample stage of the rheometer, the adjustment platform comprising a motion module and an aperture assembly, the aperture assembly being arranged on the motion module, the motion module being capable of adjusting the position of the aperture assembly in space so that the neutrons or lasers passing through the aperture assembly can accurately hit the sample on the sample stage; and a sample sight assembly for being installed on the sample stage of the rheometer, the sample sight assembly comprising a sight, a cross slit being arranged at the center of the sight, and a slit being arranged on opposite sides of the cross slit on the sight, respectively, the slits on both sides of the cross slit being parallel to one of the slits in the cross slit; when the sight is installed on the sample stage, the slits on both sides of the cross slit are perpendicular to the sample stage; the intersection of the cross slits is used to determine the center height of the sample and the middle position of the sample tube; the slits on both sides of the cross slit are used to determine the installation position of the rheometer.

[0007] In one embodiment, the sight includes a single sight and a double sight; the single sight is used to preliminarily align the sample; the double sight is used to further align the sample.

[0008] In one embodiment, the single sight is used to be installed on a sample stage, and the single sight includes a first cross slit, and the first slits are provided on both sides of the first cross slit, and the first slit is parallel to one of the first cross slits; when the single sight is installed on the sample stage, the first slit is perpendicular to the surface of the sample stage.

[0009] In one embodiment, a dual sight is used to be installed on a sample stage, and the dual sight includes a front sight and a rear sight; the front sight has a second cross slit, and the second slits are provided on both sides of the second cross slit, and the second slit is parallel to one of the second cross slits; when the front sight is installed on the sample stage, the second slit is perpendicular to the surface of the sample stage; the rear sight has a third cross slit, and the third slits are provided on both sides of the third cross slit, and the third slit is parallel to one of the third cross slits; when the rear sight is installed on the sample stage, the third slit is perpendicular to the surface of the sample stage; the size and shape of the front sight and the rear sight are the same as those of the single sight.

[0010] In one embodiment, the slits on both sides of the cross slit are slits with a length of 40 mm and a width of 1 mm.

[0011] In one embodiment, the aperture assembly includes an aperture front sight, the material of the aperture front sight is cadmium, and cadmium can absorb neutrons; the aperture front sight has a fortieth cross slit, and the fortieth cross slit is a hollow structure for allowing neutrons to pass through so as to focus the neutrons.

[0012] According to the second aspect of the present application, an embodiment provides a sample alignment method for a neutron scattering rheological experiment, comprising the following steps: a sample center position determination step: installing a sample sight assembly on a sample stage of a rheometer, and making the slits on both sides of the cross slit perpendicular to the sample stage; starting a laser emission assembly, and adjusting the position of the laser emission assembly and the rheometer, making the laser perpendicular to the surface of the sight, and making the laser irradiate the intersection of the cross slits, the intersection of which is the sample center position, and recording the sample center position; a rheometer installation position determination step: after the sample center position is determined, Keep the laser always perpendicular to the sight surface, and move the rheometer back and forth in a specific travel range, check whether the laser can illuminate the slits on both sides of the cross slit at both ends of the rheometer travel. If it can, the travel range of the rheometer is the installation position of the rheometer, and the rheometer is installed in the travel space. If not, fine-tune the rheometer until the requirements are met; Steps for determining the position of the adjustment table: After installing the rheometer in the travel range, adjust the moving components of the adjustment table in the three-dimensional axial direction so that the laser can pass through the aperture component and hit the sample position determined above, so as to determine the position of the adjustment table.

[0013] In one embodiment, the center position of the sample and the installation position of the rheometer are initially determined using a single sight, and then the center position of the sample and the installation position of the rheometer are further determined using a double sight.

[0014] In one embodiment, using a single sight to preliminarily determine the center position of the sample specifically includes: installing the single sight on the sample stage of the rheometer, and making the first slit perpendicular to the surface of the sample stage; starting the laser emitting assembly, and adjusting the position of the laser emitting assembly and the rheometer, so that the laser is perpendicular to the surface where the first cross slit of the single sight is located, and the laser is irradiated at the intersection of the first cross slits, the position where the intersection of the first cross slits is located is the center position of the sample, and the center position of the sample is recorded; the steps of using the single sight to preliminarily determine the installation position of the rheometer specifically include: after the center position of the sample is determined, keeping the laser perpendicular to the surface of the single sight, and moving the rheometer back and forth within a specific travel range, checking whether the laser can irradiate the first slit at the two ends of the rheometer travel respectively, if so, the travel range of the rheometer is the installation position of the rheometer, and then installing the rheometer in the travel space; if not, fine-tuning the rheometer until the requirements are met.

[0015] In one embodiment, the step of using a double sight to determine the center position of the sample specifically includes: installing the double sight on the sample stage, with the front sight and the rear sight being parallel to each other and parallel to the plane on which the single sight is installed on the sample stage, and ensuring that the single sight, the front sight, and the rear sight are installed on the sample stage, and the orthographic projections on the plane perpendicular to the emission direction of the laser coincide, adjusting the position of the rheometer so that the laser passes through the intersection of the second cross slit and irradiates the intersection of the third cross slit, the straight line position where the intersection of the second cross slit and the intersection of the third cross slit are located together is the center position of the sample, and recording the center position of the sample; using the double sight to determine the center position of the sample; The steps of finally determining the installation position of the rheometer specifically include: after the center position of the sample is determined, keep the laser perpendicular to the surface of the front sight, move the rheometer back and forth within a certain travel range, adjust the rheometer, and check whether the laser can pass through the second slit and illuminate the third slit at both ends of the rheometer travel. If so, the travel range of the rheometer is the installation position of the rheometer, and then install the rheometer in the travel space. If not, fine-tune the rheometer until the requirements are met; if the sample center and the installation position of the rheometer determined by the double sight and the single sight are inconsistent, repeat the sample center position determination steps and the rheometer installation position determination steps.

[0016] The present application provides a sample alignment device for neutron scattering rheological experiments, including a laser emission assembly, an adjustment platform, and a sample front sight assembly. By setting a cross slit on the front sight, and setting a slit on both sides of the cross slit on the front sight, the intersection of the cross slit is used to determine the center position of the sample placed on the sample stage, and the two slits on both sides of the cross slit are used to determine the optimal installation position of the rheometer, thereby determining the position of the sample. In addition, the position of the aperture assembly in three-dimensional space is adjusted by the motion module, so that the neutrons can be focused and accurately hit the sample.

[0017] Using the sample alignment method of the present application, by adjusting the position of the laser emission assembly and the position of the rheometer, the laser is irradiated at the intersection of the cross slits, so as to determine the center position of the sample on the sample stage. In addition, the rheometer is moved so that the laser is irradiated at the slits on both sides of the cross slit, that is, the installation position of the rheometer is determined by the travel range of the rheometer, and then the edge position of the sample is determined. The sample alignment method of the present application can accurately align the sample position and the emission angle of the neutron beam when the rheometer is applied to a neutron spectrometer, and can also beam the neutron beam so that as many neutrons as possible hit the sample, saving neutrons while also improving the experimental effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the sample alignment device and the rheometer of Example 1 of the present application;

[0019] Figure 2This is a schematic diagram of the structure of the single sight in Example 1 installed on the sample platform;

[0020] Figure 3 This is a schematic diagram of the structure of the dual sight in Example 1 installed on the sample platform; the arrow direction is the laser emission direction;

[0021] Figure 4 The structure diagram of the single sight of Example 1;

[0022] Figure 5 It is a structural schematic diagram of the dual sight of Example 1;

[0023] Figure 6 is a schematic structural diagram of the adjustment platform in Example 1;

[0024] Figure 7 It is a schematic diagram of the structure when a sample tube is placed on the sample stage.

[0025] Figure numerals: sample alignment device-100, adjustment table-110, motion module-111, first motion component-1111, second motion component-1112, third motion component-1113, aperture component-112, aperture sight-1121, fourth cross slit-1122; sample sight assembly-120, single sight-121, first cross slit-1211, first slit-1212, double sight-122, front sight-1221, second cross slit-1222, second slit-1223, rear sight-1224, third cross slit-1225, third slit-1226, rheometer-200. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0027] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0028] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0029] Example 1

[0030] This embodiment provides a sample alignment device 100 for neutron scattering rheological experiments. Figure 1-7 The sample alignment device 100 includes a laser emitting assembly (not shown), an adjustment stage 110 and a sample alignment assembly 120 .

[0031] Please refer to Figure 1-3 , the laser emission assembly is used to emit laser. The adjustment platform 110 is used to be arranged between the laser emission assembly and the sample stage of the rheometer 200. The adjustment platform 110 includes a motion module 111 and an aperture assembly 112. The aperture assembly 112 is arranged on the motion module 111. The motion module 111 can adjust the position of the aperture assembly 112 in space so that the neutrons or lasers passing through the aperture assembly 112 can accurately hit the sample on the sample stage. The sample sight assembly 120 is used to be installed on the sample stage of the rheometer 200. The sample sight assembly 120 includes a sight. A cross slit is arranged at the center of the sight. A slit is arranged on opposite sides of the cross slit on the sight. The slits on both sides of the cross slit are parallel to one of the slits in the cross slit. When the sight is installed on the sample stage, the slits on both sides of the cross slit are perpendicular to the sample stage. The intersection of the cross slits is used to determine the center height of the sample and the middle position of the sample tube. The sample tube is used to hold the sample. The slits on both sides of the cross slit are used to determine the installation position of the rheometer 200 .

[0032] In this embodiment, a cross slit is provided on the sight, and a slit is provided on both sides of the cross slit on the sight. The intersection of the cross slit can be used to determine the center position of the sample placed on the sample stage, and the two slits on both sides of the cross slit can be used to determine the best installation position of the rheometer 200, that is, to determine the edge position of the sample. In this way, the position of the sample can be finally accurately determined through the cross slit and the slits on both sides. Neutrons are focused by the adjustment stage 110, and the focused neutrons are accurately hit on the sample.

[0033] It should be noted that the laser emission assembly is installed on the neutron spectrometer in the neutron emission direction, and the laser emission direction is consistent with the neutron emission direction.

[0034] Please refer to Figure 4-5 The sight includes a single sight 121 and a double sight 122. The single sight 121 is used for preliminarily aligning the sample, and the double sight 122 is used for further aligning the sample.

[0035] The present application can doubly ensure the accuracy of the sample position and the installation position of the rheometer 200 through the single sight 121 and the double sight 122 .

[0036] Please refer to Figure 4 The single sight 121 is used to be installed on the sample stage, and the single sight 121 includes a first cross slit 1211, and the first cross slit 1211 has first slits 1212 on both sides, and the first slit 1212 is parallel to one of the slits of the first cross slit 1211. When the single sight 121 is installed on the sample stage, the first slit 1212 is perpendicular to the surface of the sample stage.

[0037] When the single sight 121 is installed on the sample stage, the first slit 1212 is perpendicular to the surface of the sample stage. In this way, the first slit 1212 can be used to determine the installation range of the rheometer 200 .

[0038] Please refer to Figure 5 The double sight 122 is used to be installed on the sample stage, and the double sight 122 includes a front sight 1221 and a rear sight 1224. The front sight 1221 has a second cross slit 1222, and the second cross slit 1222 has two sides with a second slit 1223, and the second slit 1223 is parallel to one of the second cross slits 1222. When the front sight 1221 is installed on the sample stage, the second slit 1223 is perpendicular to the surface of the sample stage. The rear sight 1224 has a third cross slit 1225, and the third cross slit 1226 is provided on both sides of the third cross slit 1225, and the third slit 1226 is parallel to one of the third cross slits 1225. When the rear sight 1224 is installed on the sample stage, the third slit 1226 is perpendicular to the surface of the sample stage. The size and shape of the front sight 1221 and the rear sight 1224 are the same as those of the single sight 121.

[0039] The double sight 122 includes a front sight 1221 and a rear sight 1224 . By setting the front sight 1221 and the rear sight 1224 in front and behind relative to the optical path direction of the laser, the position of the sample can be determined more accurately on the basis of the single sight 121 .

[0040] In this embodiment, the first slit 1212, the second slit 1223 and the third slit 1226 are all slits with a length of 40 mm and a width of 1 mm. The distance between the first slits 1212 on both sides of the first cross slit 1211 is 49 mm, the distance between the second slits 1223 on both sides of the second cross slit 1222 is 49 mm, and the distance between the third slits 1226 on both sides of the third cross slit 1225 is 49 mm. It should be noted that the second cross slit 1222 near the intersection and the position of the intersection are hollow structures, so that the laser can pass through the intersection of the second cross slit 1222 and irradiate the intersection of the third cross slit 1225. The first cross slit 1211 and the third cross slit 1225 are both non-hollow structures.

[0041] Please refer to Figure 6 The aperture assembly 112 includes an aperture front sight 1121, which is made of cadmium, which can absorb neutrons. The aperture front sight 1121 has a fourth cross slit 1122, which is a hollow structure for allowing neutrons to pass through so as to focus the neutrons.

[0042] Please refer to Figure 6 The motion module includes a first motion component 1111, a second motion component 1112 and a third motion component 1113. The second motion component 1112 is arranged on the first motion component 1111, the third motion component 1113 is arranged on the second motion component 1112, and the aperture component 112 is arranged on the third motion component 1113. The first motion component 1111 can move along the first axial direction to drive the second motion component 1112, the third motion component 1113 and the aperture component 112 to move in the first axial direction. The second motion component 1112 can move along the second axial direction to drive the third motion component 1113 and the aperture component 112 to move in the second axial direction. The third motion component 1113 can move along the third axial direction to drive the aperture component 112 to move in the third axial direction, and the first axial direction, the second axial direction and the third axial direction are perpendicular to each other. In this way, the motion component can adjust the position of the aperture crosshair 1121 in three-dimensional space to accurately hit the focused neutrons on the sample stage of the rheometer 200.

[0043] Example 2

[0044] This embodiment provides a sample alignment method for a neutron scattering rheology experiment. The sample alignment method adopts the sample alignment device 100 in Embodiment 1.

[0045] The sample alignment method includes the following steps:

[0046] The steps for initially determining the center position of the sample are as follows: install the single sight 121 on the sample stage of the rheometer 200, and make the first slit 1212 perpendicular to the surface of the sample stage; start the laser emission component, and adjust the position of the laser emission component and the rheometer 200, so that the laser is perpendicular to the surface where the first cross slit 1211 of the single sight 121 is located, and make the laser irradiate the intersection of the first cross slit 1211, and the intersection of the first cross slit 1211 is the center position of the sample, and the neutron spectrometer control end records the position where the laser irradiates the intersection of the single sight 121 as the center position of the sample. .

[0047] Preliminary steps for determining the installation position of the rheometer 200: the rheometer 200 has a first side and a second side that are relatively arranged, the direction of the line connecting the first side and the second side is perpendicular to the emission direction of the laser, the first side is close to one of the first slits 1212, and the second side is close to the other first slit 1212. After the center position of the sample is determined, keep the laser always perpendicular to the surface of the single sight 121, first move the rheometer 200 to the second side by 24.5 mm, adjust the rheometer 200 so that the laser shines on the first slit 1212 close to the first side, and then move the rheometer 200 to the first side by 49 mm, check whether the laser shines on the first slit 1212 close to the second side, if the laser can shine on the first slit 1212 on the second side, the travel range of the rheometer 200 is the installation position of the rheometer 200, and then install the rheometer 200 in the travel space; if the laser cannot shine on the first slit 1212 on the second side, it is necessary to fine-tune the rheometer 200 until the requirements are met.

[0048] When conducting neutron scattering rheology experiments on samples, scattered neutrons are used to study the rheological behavior of the samples. It is necessary not only to study the samples at the center position, but also to study the samples on both sides of the center position. When studying the samples on both sides of the center position, it is necessary to ensure the position accuracy of the rheometer, and then ensure the accuracy of the edge position of the sample, otherwise it will affect the experimental results.

[0049] The final determination steps of the sample center position are as follows: install the double sight 122 on the sample stage, the front sight 1221 and the rear sight 1224 are parallel to each other and parallel to the plane where the single sight 121 is installed on the sample stage, and ensure that the single sight 121, the front sight 1221 and the rear sight 1224 are installed on the sample stage, and the orthographic projections on the plane perpendicular to the emission direction of the laser coincide, and adjust the position of the rheometer 200 so that the laser passes through the intersection of the second cross slit 1222 and irradiates the intersection of the third cross slit 1225. The straight line position where the intersection of the second cross slit 1222 and the intersection of the third cross slit 1225 are located together is the sample center position, and the neutron spectrometer control end records the straight line position where the intersection of the second cross slit 1222 and the intersection of the third cross slit 1225 are located together as the sample center position. .

[0050] In this step, it is ensured that when the single sight 121, the front sight 1221 and the rear sight 1224 are installed on the sample stage, their orthographic projections on the plane perpendicular to the laser emission direction coincide with each other, in order to ensure that the sample center position determined by the single sight 121 and the double sight 122 and the installation position of the rheometer 200 can be kept consistent.

[0051] Steps for finalizing the installation position of the rheometer 200: After the center position of the sample is determined, keep the laser perpendicular to the surface of the front sight 1221, first move the rheometer 200 to the second side by 24.5 mm, adjust the rheometer 200 so that the laser passes through the second slit 1223 close to the first side and shines on the third slit 1226 close to the first side, then move the rheometer 200 to the first side by 49 mm, check whether the laser passes through the second slit 1223 close to the second side and shines on the third slit 1226, if the laser can pass through the second slit 1223 and irradiates the third slit 1226. The travel range of the rheometer 200 is the installation position of the rheometer 200. If the laser cannot pass through the second slit 1223 and irradiate the third slit 1226, the rheometer needs to be fine-tuned until the requirements are met; then the rheometer 200 is installed in the travel space; if the sample center and the installation position of the rheometer 200 determined by the double sight 122 and the single sight 121 are inconsistent, the single sight and the double sight are used again to determine the sample center position and the installation position of the rheometer 200.

[0052] Steps for determining the position of the adjustment platform 110: After the rheometer 200 is installed within the travel range, the moving components of the adjustment platform 110 are adjusted in the three-dimensional axial direction so that the laser can pass through the fourth cross slit 1122, the aperture sight 1121, and hit the sample position determined above, thereby determining the position of the adjustment platform 110.

[0053] After determining the sample center position, the installation position of the rheometer 200 and the position of the adjustment platform 110 through the above steps, remove the double sight 122 from the sample platform, install the sample cup of the rheometer 200 on the sample platform, and then perform the neutron scattering experiment.

[0054] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A sample alignment device for neutron scattering rheological experiments, characterized in that: include: A laser emitting component, used for emitting laser; An adjustment platform, used to be arranged between the laser emission assembly and the sample stage of the rheometer, the adjustment platform includes a motion module and an aperture assembly, the aperture assembly is arranged on the motion module, and the motion module can adjust the position of the aperture assembly in space so that the neutron or laser passing through the aperture assembly can accurately hit the sample on the sample stage; And a sample sight assembly, which is used to be installed on the sample stage of the rheometer, the sample sight assembly includes a sight, a cross slit is set at the center of the sight, and a slit is set on the opposite sides of the cross slit on the sight, and the slits on both sides of the cross slit are parallel to one of the cross slits; when the sight is installed on the sample stage, the slits on both sides of the cross slit are perpendicular to the sample stage; the intersection of the cross slits is used to determine the center height of the sample and the middle position of the sample tube; the slits on both sides of the cross slit are used to determine the installation position of the rheometer.

2. The sample alignment device according to claim 1, characterized in that: The sight includes a single sight and a double sight; the single sight is used for preliminarily aligning the sample; the double sight is used for further aligning the sample.

3. The sample alignment device according to claim 2, characterized in that: The single sight is used to be installed on a sample stage, and the single sight includes a first cross slit, and the first cross slit has first slits on both sides, and the first slit is parallel to one of the first cross slits; when the single sight is installed on the sample stage, the first slit is perpendicular to the surface of the sample stage.

4. The sample alignment device according to claim 2, characterized in that: The dual sight is used to be installed on the sample stage, and the dual sight includes a front sight and a rear sight; The front sight has a second cross slit, and the second cross slit has second slits on both sides, and the second slit is parallel to one of the second cross slits; When the front sight is installed on the sample stage, the second slit is perpendicular to the surface of the sample stage; the rear sight has a third cross slit, and the third slit is parallel to one of the third cross slits on both sides of the third cross slit; when the rear sight is installed on the sample stage, the third slit is perpendicular to the surface of the sample stage; the size and shape of the front sight and the rear sight are the same as those of the single sight.

5. The sample alignment device according to claim 1, characterized in that: The slits on both sides of the cross slit are slits with a length of 40 mm and a width of 1 mm.

6. The sample alignment device according to any one of claims 1 to 5, characterized in that: The aperture assembly includes an aperture front sight, the material of the aperture front sight is cadmium, and the cadmium can absorb neutrons; the aperture front sight has a fourth cross slit, and the fourth cross slit is a hollow structure for allowing neutrons to pass through so as to focus the neutrons.

7. A sample alignment method for neutron scattering rheological experiments, characterized in that: The steps include: The steps of determining the center position of the sample are as follows: installing the sample sight assembly on the sample stage of the rheometer, and making the slits on both sides of the cross slit perpendicular to the sample stage; starting the laser emission assembly, and adjusting the positions of the laser emission assembly and the rheometer, making the laser perpendicular to the surface of the sight, and making the laser irradiate the intersection of the cross slits, the intersection of which is the center position of the sample, and recording the center position of the sample; The step of determining the installation position of the rheometer: after the center position of the sample is determined, the laser is kept perpendicular to the sight surface, and the rheometer is moved back and forth within a specific travel range, and it is checked whether the laser can irradiate the slits on both sides of the cross slit at the two ends of the rheometer travel respectively. If it can, the travel range of the rheometer is the installation position of the rheometer, and the rheometer is installed in the travel space. If it cannot, the rheometer is fine-tuned until the requirements are met; Steps for determining the position of the adjustment table: After the rheometer is installed within the travel range, the moving components of the adjustment table are adjusted in the three-dimensional axial direction so that the laser can pass through the aperture component and hit the sample position determined above, thereby determining the position of the adjustment table.

8. The sample alignment method according to claim 7, characterized in that: It includes using a single sight to preliminarily determine the center position of the sample and the installation position of the rheometer, and then using a double sight to further determine the center position of the sample and the installation position of the rheometer.

9. The sample alignment method according to claim 8, characterized in that: Using a single sight to preliminarily determine the center position of the sample specifically includes: installing the single sight on the sample stage of the rheometer, and making the first slit perpendicular to the surface of the sample stage; starting the laser emission component, and adjusting the positions of the laser emission component and the rheometer, so that the laser is perpendicular to the surface where the first cross slit of the single sight is located, and making the laser irradiate the intersection of the first cross slits, the intersection of the first cross slits is the center position of the sample, and recording the center position of the sample; The step of using a single sight to preliminarily determine the installation position of the rheometer specifically includes: after the center position of the sample is determined, the laser is kept perpendicular to the surface of the single sight, and the rheometer is moved back and forth within a specific travel range, and it is checked whether the laser can be irradiated on the first slit at both ends of the rheometer travel. If so, the travel range of the rheometer is the installation position of the rheometer, and then the rheometer is installed in the travel space; if not, the rheometer is fine-tuned until the requirements are met.

10. The sample alignment method according to claim 7, characterized in that: The step of using the dual sight to determine the center position of the sample specifically includes: installing the dual sight on the sample stage, with the front sight and the rear sight being parallel to each other and parallel to the plane where the single sight is installed on the sample stage, and ensuring that the single sight, the front sight and the rear sight are installed on the sample stage, and the orthographic projections on the plane perpendicular to the emission direction of the laser coincide, adjusting the position of the rheometer so that the laser passes through the intersection of the second cross slit and irradiates the intersection of the third cross slit, the straight line position where the intersection of the second cross slit and the intersection of the third cross slit are located together is the center position of the sample, and recording the center position of the sample; The step of using the dual sights to finally determine the installation position of the rheometer specifically includes: after the center position of the sample is determined, keeping the laser always perpendicular to the surface of the front sight, and moving the rheometer back and forth within a certain travel range, adjusting the rheometer, and checking whether the laser can pass through the second slit at both ends of the rheometer travel and illuminate the third slit. If so, the travel range of the rheometer is the installation position of the rheometer, and then the rheometer is installed in the travel space. If not, fine-tune the rheometer until the requirements are met; if the sample center and the installation position of the rheometer determined by the dual sights and the single sight are inconsistent, repeat the sample center position determination step and the rheometer installation position determination step.

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