Sample collimation method and apparatus for neutron scattering rheometry experiments

Abstract

The application provides a sample collimation method and device for neutron scattering rheological experiment. The adjusting table comprises a movement module and a diaphragm assembly. The diaphragm assembly is arranged on the movement module. The movement module can adjust the position of the diaphragm assembly in space, so that the neutrons or laser passing through the diaphragm assembly can accurately hit the sample on the sample table. The sample collimation assembly comprises a collimator. The center of the collimator is provided with a cross slit. One slit is arranged on each side of the cross slit on the collimator. The slits on the two sides of the cross slit are parallel to one of the slits of the cross slit. The intersection of the cross slit is used to determine 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 to determine the installation position of the rheometer. The device of the application can accurately collimate the sample position and the emission angle of the neutron beam, so that as many neutrons as possible hit the sample, and the experimental effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neutron scattering rheological experiment, and particularly relates to a sample collimation method and device for neutron scattering rheological experiment. BACKGROUND

[0002] In the field of material science, in order to study the microstructure of materials, people often place samples in special sample environment equipment, and observe the physical properties and phase transition of substances under different environmental conditions by means of neutron scattering. The special sample environment in the experiment is usually generated by various special equipment. Rheological measurement is an effective method for observing the internal structure of polymer materials. By responding to different scale molecular chains in polymer materials such as plastics, rubbers and resins, the molecular weight and molecular weight distribution of the polymer materials can be characterized, and the quality detection and quality control of raw materials, intermediate products and final products can be quickly, simply and effectively carried out.

[0003] The rheometer assisted neutron scattering spectrometer can effectively realize in-situ measurement of the micro-nano structure of soft matter macromolecular solution under flow field and reveal the evolution dynamics process, so as to realize in-situ characterization of the multi-level structure, rheological mechanics and other properties of soft matter, find the internal correlation between structure and property, and lay 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 art, when the rheometer is used on the neutron spectrometer, the sample position cannot be accurately collimated with the neutron beam, and because 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

[0005] The present application provides a sample collimation method and device for neutron scattering rheological experiment. The sample collimation method uses a sample collimation device, which can accurately collimate the sample position and the emission angle of the neutron beam when the rheometer is applied to the neutron spectrometer. At the same time, the neutron beam can also be concentrated, so that as many neutrons as possible hit the sample, saving neutrons and improving experimental results.

[0006] According to a first aspect of the present application, a sample collimation device for neutron scattering rheological experiment is provided in an embodiment, comprising: a laser emitting assembly for emitting laser; an adjusting table for being arranged between the laser emitting assembly and a sample table of a rheometer, the adjusting table comprising a movement module and a diaphragm assembly arranged on the movement module, the movement module being capable of adjusting the position of the diaphragm assembly in space so that the neutron or laser passing through the diaphragm assembly can accurately hit the sample on the sample table; and a sample collimator assembly for being mounted on the sample table of the rheometer, the sample collimator assembly comprising a collimator, the center of the collimator being provided with a cross-shaped slit, and one slit being arranged on each of the opposite sides of the cross-shaped slit on the collimator, the slits on the opposite sides of the cross-shaped slit being parallel to one of the slits of the cross-shaped slit; when the collimator is mounted on the sample table, the slits on the opposite sides of the cross-shaped slit are perpendicular to the sample table; the intersection of the cross-shaped slit is used to determine the center height of the sample and the middle position of the sample cylinder; and the slits on the opposite sides of the cross-shaped slit are used to determine the mounting position of the rheometer.

[0007] In an embodiment, the collimator comprises a single collimator and a double collimator; the single collimator is used for preliminary collimation of the sample; and the double collimator is used for further collimation of the sample.

[0008] In an embodiment, the single collimator is used for being mounted on the sample table, and the single collimator comprises a first cross-shaped slit, the opposite sides of the first cross-shaped slit having first slits, the first slits being parallel to one of the slits of the first cross-shaped slit; when the single collimator is mounted on the sample table, the first slits are perpendicular to the surface of the sample table.

[0009] In an embodiment, the double collimator is used for being mounted on the sample table, and the double collimator comprises a front collimator and a rear collimator; the front collimator has a second cross-shaped slit, the opposite sides of the second cross-shaped slit having second slits, the second slits being parallel to one of the slits of the second cross-shaped slit; when the front collimator is mounted on the sample table, the second slits are perpendicular to the surface of the sample table; the rear collimator has a third cross-shaped slit, the opposite sides of the third cross-shaped slit having third slits, the third slits being parallel to one of the slits of the third cross-shaped slit; when the rear collimator is mounted on the sample table, the third slits are perpendicular to the surface of the sample table; and the size and shape of the front collimator and the rear collimator are the same as those of the single collimator.

[0010] In an embodiment, the slits on the opposite sides of the cross-shaped slit are slits with a length of 40 mm and a width of 1 mm.

[0011] In an embodiment, the diaphragm assembly comprises a diaphragm collimator, the material of the diaphragm collimator being cadmium, which can absorb neutrons; the diaphragm collimator has a fourth cross-shaped slit, the fourth cross-shaped slit being a hollow structure for passing neutrons so as to concentrate the neutrons.

[0012] According to the second aspect of the present application, a sample collimation method for a neutron scattering rheological experiment is provided in an embodiment, comprising the following steps: a sample center position determining step: installing a sample collimator assembly on a rheometer sample table, and making the slits on both sides of the cross slit perpendicular to the sample table; starting a laser emitting assembly, and adjusting the positions of the laser emitting assembly and the rheometer, so that the laser is perpendicular to the surface of the collimator, and the laser irradiates the intersection of the cross slit, the position of the intersection is the sample center position, and the sample center position is recorded; a rheometer installation position determining step: after the sample center position is determined, the laser is kept perpendicular to the surface of the collimator, and the rheometer is moved back and forth in a specific stroke range, and it is checked whether the laser can irradiate the slits on both sides of the cross slit at the two end positions of the stroke of the rheometer, if yes, the stroke range of the rheometer is the installation position of the rheometer, and the rheometer is installed in the stroke space, if not, the rheometer is finely adjusted until the requirement is met; an adjusting table position determining step: after the rheometer is installed in the stroke range, the movement assembly of the adjusting table is adjusted in the three-dimensional axial direction, so that the laser can pass through the diaphragm assembly and hit the aforementioned determined sample position, thereby determining the position of the adjusting table.

[0013] In an embodiment, the sample center position and the rheometer installation position are preliminarily determined using a single collimator, and then the sample center position and the rheometer installation position are further determined using a double collimator.

[0014] In an embodiment, the preliminarily determining the sample center position using a single collimator specifically comprises: installing the single collimator on the sample table of the rheometer, and making the first slit perpendicular to the surface of the sample table; starting the laser emitting assembly, and adjusting the positions 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 collimator is located, and the laser irradiates the intersection of the first cross slit, the position of the intersection of the first cross slit is the sample center position, and the sample center position is recorded; the preliminarily determining the installation position of the rheometer using the single collimator specifically comprises: after the sample center position is determined, the laser is kept perpendicular to the surface of the single collimator, and the rheometer is moved back and forth in a specific stroke range, and it is checked whether the laser can irradiate the first slit at the two end positions of the stroke of the rheometer, if yes, the stroke range of the rheometer is the installation position of the rheometer, and then the rheometer is installed in the stroke space; if not, the rheometer is finely adjusted until the requirement is met.

[0015] In one embodiment, the step of determining the sample center position using the double front and rear sights specifically comprises: installing the double front and rear sights on the sample stage, the front and rear sights being parallel to each other and parallel to the plane in 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 so that their projections on the plane perpendicular to the laser emission direction 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 position of the straight line on which the intersection of the second cross slit and the intersection of the third cross slit are located being the sample center position, and recording the sample center position; the step of finally determining the installation position of the rheometer using the double front and rear sights specifically comprises: after the sample center position is determined, keeping the laser always perpendicular to the surface of the front sight and reciprocally moving the rheometer within a certain stroke range, adjusting the rheometer, checking whether the laser can pass through the second slit and irradiate the third slit at both ends of the stroke range of the rheometer, if yes, the stroke range of the rheometer is the installation position of the rheometer, and then installing the rheometer in the stroke space, if not, fine-tuning the rheometer until the requirement is met; if the sample center position and the installation position of the rheometer determined by the double front and rear sights and the single sight are inconsistent, repeating the steps of determining the sample center position and determining the installation position of the rheometer.

[0016] The present application provides a sample collimation device for neutron scattering rheological experiment, which comprises a laser emission assembly, an adjusting table and a sample sight assembly. By arranging a cross slit on the sight and arranging a slit on each side of the cross slit, 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 the two 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 diaphragm assembly in the three-dimensional space is adjusted by the motion module, so that the neutrons can be precisely focused on the sample.

[0017] By adjusting the position of the laser emission assembly and the position of the rheometer, the laser irradiates the intersection of the cross slit, so as to determine the center position of the sample on the sample stage. In addition, the rheometer is moved so that the laser irradiates the slits on the two sides of the cross slit, that is, the installation position of the rheometer is determined by the stroke range of the rheometer, and the edge position of the sample is further determined. The sample collimation method of the present application can accurately collimate the sample position and the emission angle of the neutron beam when the rheometer is applied to the neutron spectrometer, and can also focus the neutron beam, so that as many neutrons as possible hit the sample, saving neutrons and improving experimental results. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of the sample collimation device and the rheometer of Embodiment 1 of the present application;

[0019] Figure 2Structure diagram of the single collimator star installed on the sample stage in Example 1;

[0020] Figure 3 Structure diagram of the double collimator star installed on the sample stage in Example 1; the arrow direction is the laser emission direction;

[0021] Figure 4 Structure diagram of the single collimator star in Example 1;

[0022] Figure 5 Structure diagram of the double collimator star in Example 1;

[0023] Figure 6 Structure diagram of the adjustment stage in Example 1;

[0024] Figure 7 Structure diagram when the sample cylinder is placed on the sample stage.

[0025] Figures: sample collimation device-100, adjustment stage-110, motion module-111, first motion assembly-1111, second motion assembly-1112, third motion assembly-1113, diaphragm assembly-112, diaphragm collimator star-1121, fourth cross slit-1122; sample collimator star assembly-120, single collimator star-121, first cross slit-1211, first slit-1212, double collimator star-122, front collimator star-1221, second cross slit-1222, second slit-1223, rear collimator star-1224, third cross slit-1225, third slit-1226, rheometer-200. DETAILED DESCRIPTION

[0026] The application will be further described in details through specific embodiments combined with the drawings. In different embodiments, similar elements are associated with similar element labels. In the following embodiments, many details are described in order to make the application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the application are not shown or described in the specification, in order to avoid the core part of the application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art, 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, features described in the specification, operations or characteristics can be combined in any appropriate manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be sequentially exchanged or adjusted in a manner that can be apparent 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 do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

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

[0029] Embodiment 1

[0030] In this embodiment, a sample collimation device 100 for neutron scattering rheological experiment is provided, please refer to Figures 1-7 The sample collimation device 100 includes a laser emitting assembly (not shown), an adjusting table 110, and a sample collimation assembly 120.

[0031] Please refer to Figures 1-3 The laser emitting assembly is used for emitting laser. The adjusting table 110 is used for being arranged between the laser emitting assembly and a sample table of a rheometer 200, the adjusting table 110 includes a movement module 111 and an aperture assembly 112, the aperture assembly 112 is arranged on the movement module 111, the movement module 111 can adjust the position of the aperture assembly 112 in space, so that the neutron or laser passing through the aperture assembly 112 can accurately hit on the sample of the sample table. The sample collimation assembly 120 is used for being installed on the sample table of the rheometer 200, the sample collimation assembly 120 includes a collimator, the center of the collimator is provided with a cross slit, and one slit is arranged on each of the opposite sides of the cross slit on the collimator, and the two slits on the opposite sides of the cross slit are parallel to one slit of the cross slit. When the collimator is installed on the sample table, the two slits on the opposite sides of the cross slit are perpendicular to the sample table. The intersection of the cross slit is used for determining the center height of the sample and the middle position of a sample cylinder, and the sample cylinder is used for containing the sample. The two slits on the opposite sides of the cross slit are used for determining the installation position of the rheometer 200.

[0032] In this embodiment, by arranging the cross slit on the collimator, and arranging one slit on each of the opposite sides of the cross slit on the collimator, the intersection of the cross slit can be used for determining the center position of the sample placed on the sample table, and the two slits on the opposite sides of the cross slit can be used for determining the best installation position of the rheometer 200, that is, determining the edge position of the sample, so that the position of the sample can be finally accurately determined through the cross slit and the two slits on the opposite sides. And the adjusting table 110 is used for bundling the neutrons, and the neutrons after being bundled can accurately hit on the sample.

[0033] It should be noted that the laser emitting 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 Figures 4-5 The foresight includes a single foresight 121 and a double foresight 122, the single foresight 121 is used for collimating the sample initially, and the double foresight 122 is used for collimating the sample further.

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

[0036] Please refer to Figure 4 The single foresight 121 is used for installing on the sample table, and the single foresight 121 includes a first cross slit 1211, the two sides of the first cross slit 1211 have a first slit 1212, and the first slit 1212 is parallel to one slit of the first cross slit 1211. When the single foresight 121 is installed on the sample table, the first slit 1212 is perpendicular to the surface of the sample table.

[0037] When the single foresight 121 is installed on the sample table, the first slit 1212 is perpendicular to the surface of the sample table, so that the first slit 1212 can be used to determine the installation range of the rheometer 200.

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

[0039] The double foresight 122 includes the front foresight 1221 and the rear foresight 1224, and the front foresight 1221 and the rear foresight 1224 are arranged in front of and behind the light path direction of the laser, so that the position of the sample can be determined more accurately on the basis of the single foresight 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-shaped slit 1211 is 49 mm, the distance between the second slits 1223 on both sides of the second cross-shaped slit 1222 is 49 mm, and the distance between the third slits 1226 on both sides of the third cross-shaped slit 1225 is 49 mm. It should be noted that the position of the second cross-shaped slit 1222 close to the intersection point and the intersection point is a hollow structure, so that the laser can pass through the intersection point of the second cross-shaped slit 1222 to irradiate on the intersection point of the third cross-shaped slit 1225. The first cross-shaped slit 1211 and the third cross-shaped slit 1225 are both non-hollow structures.

[0041] Please refer to Figure 6 The diaphragm assembly 112 includes a diaphragm foresight 1121, and the diaphragm foresight 1121 is made of cadmium which can absorb neutrons. The diaphragm foresight 1121 has a fourth cross-shaped slit 1122 which is a hollow structure for passing neutrons to concentrate the neutrons.

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

[0043] Embodiment 2

[0044] The embodiment provides a sample collimation method for a neutron scattering rheological experiment, and the sample collimation method adopts the sample collimation device 100 in the embodiment 1.

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

[0046] Sample center position preliminary determination step: install the single star 121 on the sample table of the rheometer 200, and make the first slit 1212 perpendicular to the surface of the sample table; start the laser emitting assembly, and adjust the positions of the laser emitting assembly and the rheometer 200, so that the laser is perpendicular to the surface on which the first cross slit 1211 of the single star 121 is located, and the laser irradiates the intersection point of the first cross slit 1211, the position of the intersection point of the first cross slit 1211 is the sample center position, and the neutron spectrometer control end records the position of the intersection point of the single star 121 irradiated by the laser as the sample center position.

[0047] Rheometer 200 installation position preliminary determination step: the rheometer 200 has oppositely arranged first and second sides, the connecting line direction of 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 sample center position is determined, the laser is kept perpendicular to the surface of the single star 121, the rheometer 200 is first moved 24.5 mm towards the second side, the rheometer 200 is adjusted so that the laser irradiates the first slit 1212 close to the first side, and then the rheometer 200 is moved 49 mm towards the first side, and it is checked whether the laser irradiates the first slit 1212 close to the second side, if the laser can irradiate the first slit 1212 of the second side, the travel range of the rheometer 200 is the installation position of the rheometer 200, and then the rheometer 200 is installed in the travel space; if the laser cannot irradiate the first slit 1212 of the second side, the rheometer 200 needs to be finely adjusted until the requirement is met.

[0048] When the sample is subjected to the neutron scattering rheological experiment, the sample at the center position needs to be studied, and the samples on both sides of the center position also need to be studied. When the samples on both sides of the center position are studied, the position accuracy of the rheometer needs to be ensured, and then the accuracy of the sample edge position is ensured, otherwise the experimental effect will be affected.

[0049] Sample center position final determination step: install the double star 122 on the sample table, the front star 1221 and the rear star 1224 are parallel to each other and parallel to the plane on which the single star 121 is installed on the sample table, and it is ensured that the single star 121, the front star 1221 and the rear star 1224 are installed on the sample table, and the orthographic projections on the plane perpendicular to the emission direction of the laser coincide, the position of the intersection point of the second cross slit 1222 and the intersection point of the third cross slit 1225 is the sample center position, and the neutron spectrometer control end records the straight line position where the intersection point of the second cross slit 1222 and the intersection point of the third cross slit 1225 are located as the sample center position.

[0050] In this step, the single star 121 and the double star 122 are used to ensure that the single star 121 and the double star 122 determine the sample center position and the installation position of the rheometer 200 to be consistent.

[0051] Final rheometer 200 installation position determination step: after the sample center position is determined, the laser is kept perpendicular to the surface of the front star 1221, the rheometer 200 is first moved 24.5 mm to the second side, the rheometer 200 is adjusted 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, and then the rheometer 200 is moved 49 mm to the first side, and it is checked whether the laser can pass through the second slit 1223 close to the second side and shine on the third slit 1226. If the laser can pass through the second slit 1223 and shine on 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 shine on 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 determined by the double star 122 and the single star 121 and the installation position of the rheometer 200 are inconsistent, the single star and the double star are used to determine the sample center position and the installation position of the rheometer 200 again.

[0052] Adjustment table 110 position determination step: after the rheometer 200 is installed in the travel range, the movement assembly of the adjustment table 110 is adjusted in three-dimensional axial direction to make the laser pass through the fourth cross slit 1122 diaphragm star 1121 and hit the sample position determined above, so as to determine the position of the adjustment table 110.

[0053] After the sample center position, the installation position of the rheometer 200 and the position of the adjustment table 110 are determined by the above steps, the double star 122 is removed from the sample table, the rheometer 200 sample cup is installed on the sample table, and the subsequent neutron scattering experiment can be carried out.

[0054] The above application of specific examples to the present application is described, which is only used to help understand the present application and does not limit the present application. For those skilled in the art to which the present application belongs, according to the idea of the present application, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A sample collimation device for neutron scattering rheological experiments, characterized in that, include: Laser emitting assembly, used to emit laser light; An adjustment stage is used to be set between the laser emitting component and the sample stage of the rheometer. The adjustment stage includes a motion module and an aperture assembly. The aperture assembly is set in the motion module. The motion module can adjust 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. A sample sight assembly is provided for mounting on the sample stage of the rheometer. The sample sight assembly includes a sight with a crosshair slit at its center and a slit on each side of the crosshair slit. The slits on both sides of the crosshair slit are parallel to one of the crosshair slits. When the sight is mounted on the sample stage, the slits on both sides of the crosshair slit are perpendicular to the sample stage. The intersection of the crosshair 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 crosshair slit are used to determine the installation position of the rheometer.

2. The sample collimation device as described in claim 1, characterized in that, The sights include a single sight and a double sight; the single sight is used for initial collimation of the sample; the double sight is used for further collimation of the sample.

3. The sample collimation device as described in claim 2, characterized in that, The single crosshair is used to mount on the sample stage, and the single crosshair includes a first crosshair slit, with first slits on both sides of the first crosshair slit, and the first slits are parallel to one of the slits of the first crosshair slit; when the single crosshair is mounted on the sample stage, the first slits are perpendicular to the surface of the sample stage.

4. The sample collimation device as described in claim 2, characterized in that, The dual crosshairs are used to mount on the sample stage, and the dual crosshairs include a front crosshair and a rear crosshair; The front sight has a second crosshair slit, and there are second slits on both sides of the second crosshair slit, and the second slits are parallel to one of the slits of the second crosshair slit; When the front sight is mounted 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 there are third slits on both sides of the third cross slit, and the third slit is parallel to one of the slits of the third cross slit; when the rear sight is mounted on the sample stage, the third slit is perpendicular to the surface of the sample stage; the size and shape of the front and rear sights are the same as those of the single sight.

5. The sample collimation device as described in claim 1, characterized in that, The slits on both sides of the cross slit are 40mm long and 1mm wide.

6. The sample collimation device according to any one of claims 1-5, characterized in that, The aperture assembly includes an aperture sight made of cadmium, which is capable of absorbing neutrons; the aperture sight has a fourth crosshair slit, which is a hollow structure for allowing neutrons to pass through, so as to focus the neutrons.

7. A sample collimation method for a neutron scattering rheological experiment, characterized in that, Includes the following steps: Steps for determining the sample center position: Install the sample crosshair assembly on the sample stage of the rheometer, and make the slits on both sides of the crosshair perpendicular to the sample stage; start the laser emission assembly, and adjust the position of the laser emission assembly and the rheometer so that the laser is perpendicular to the surface of the crosshair and the laser illuminates the intersection of the crosshairs. The location of the intersection is the sample center position. Record the sample center position. Steps for determining the installation position of the rheometer: After determining the center position of the sample, keep the laser perpendicular to the crosshair surface and move the rheometer back and forth within a specific stroke range. Check whether the laser can irradiate the slits on both sides of the crosshair at both ends of the rheometer's stroke. If so, the stroke range of the rheometer is the installation position of the rheometer. Install the rheometer within the stroke space. If not, fine-tune the rheometer until the requirements are met. Steps for determining the position of the adjustment stage: After installing the rheometer within its travel range, adjust the motion components of the adjustment stage in the three-dimensional axis so that the laser can pass through the aperture assembly and hit the previously determined sample position, thereby determining the position of the adjustment stage.

8. The sample collimation method as described in claim 7, characterized in that, The process involves first using a single crosshair to initially determine the sample center position and the rheometer installation position, and then using a dual crosshair to further determine the sample center position and the rheometer installation position.

9. The sample collimation method as described in claim 8, characterized in that, The preliminary determination of the sample center position using a single crosshair specifically includes: mounting the single crosshair on the sample stage of the rheometer and making the first slit perpendicular to the surface of the sample stage; activating the laser emission assembly and adjusting the positions of the laser emission assembly and the rheometer so that the laser is perpendicular to the surface where the first crosshair slit of the single crosshair is located, and making the laser illuminate the intersection of the first crosshair slit. The position of the intersection of the first crosshair slit is the sample center position, and the sample center position is recorded. The steps for initially determining the installation position of the rheometer using a single crosshair specifically include: after determining the center position of the sample, keeping the laser perpendicular to the surface of the single crosshair and moving the rheometer back and forth within a specific travel range, checking whether the laser can irradiate the first slit at both ends of the rheometer's travel range. If so, the travel range of the rheometer is the installation position of the rheometer, and then the rheometer is installed within the travel space; if not, the rheometer is fine-tuned until the requirements are met.

10. The sample collimation method as described in claim 8, characterized in that, The steps for determining the sample center position using the dual crosshairs specifically include: mounting the dual crosshairs on the sample stage, with the front and rear crosshairs parallel to each other and parallel to the plane on which the single crosshair is mounted on the sample stage, and ensuring that the orthographic projections of the single crosshair, the front crosshair, and the rear crosshair on the sample stage coincide on the plane perpendicular to the laser emission direction; adjusting the position of the rheometer so that the laser passes through the intersection of the second crosshair slit and illuminates the intersection of the third crosshair slit; the straight line position where the intersection of the second crosshair slit and the intersection of the third crosshair slit are located is the sample center position; and recording the sample center position. The steps for determining the rheometer installation position using the dual crosshairs specifically include: after determining the sample center position, keeping the laser perpendicular to the surface of the front crosshair and moving the rheometer back and forth within a certain stroke range, adjusting the rheometer, and checking whether the laser can pass through the second slit and illuminate the third slit at both ends of the rheometer's stroke. If so, the stroke range of the rheometer is the installation position of the rheometer, and then the rheometer is installed within the stroke space. If not, the rheometer is fine-tuned until the requirements are met. If the sample center and rheometer installation position determined by the dual crosshairs and the single crosshair are inconsistent, the steps for determining the sample center position and the rheometer installation position are repeated.

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