CN109671513B - Neutron collimator structure with continuously adjustable divergence angle and calibration method thereof - Google Patents
Neutron collimator structure with continuously adjustable divergence angle and calibration method thereof Download PDFInfo
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- CN109671513B CN109671513B CN201811618906.4A CN201811618906A CN109671513B CN 109671513 B CN109671513 B CN 109671513B CN 201811618906 A CN201811618906 A CN 201811618906A CN 109671513 B CN109671513 B CN 109671513B
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Abstract
The invention discloses a neutron collimator structure with continuously adjustable divergence angle and a calibration method thereof, wherein the neutron collimator structure comprises: a plurality of neutron absorption layers are arranged in parallel, and an adjusting column is fixed above and below each neutron absorption layer; the adjusting slide block is of a hollow frame structure and is arranged outside the neutron absorbing layers; the upper surface and the lower surface of the adjusting slide block are respectively provided with adjusting grooves with the number corresponding to that of the neutron absorption layer, the space between every two adjusting grooves is gradually distributed along the direction in which the neutron absorption layers are arranged in parallel, and adjusting columns of the neutron absorption layers extend into the adjusting grooves; and the driving structure is used for driving the adjusting slide block to move along the direction in which the neutron absorption layers are arranged in parallel so as to change the position of the adjusting column in the adjusting groove and change the distance between the neutron absorption layers, thereby realizing the continuous adjustment of the neutron divergence angle. The structure can realize the adjustment of the divergence angle as required, meet the requirements of various neutron experiments and save the time and the cost of neutron beam current.
Description
Technical Field
The disclosure belongs to a neutron optical device, and relates to a neutron collimator structure with a continuously adjustable divergence angle and a calibration method thereof, in particular to a neutron collimator structure with a continuously adjustable divergence angle based on changing the interval of neutron absorption layers and a calibration method of the divergence angle of the neutron collimator structure.
Background
The neutron scattering spectrometer is an instrument which uses a large number of neutrons with different energies generated by a reactor, a spallation source and the like as a neutron source, selects neutrons with certain energy from the neutrons to be incident on a sample to be researched, and realizes the research on the aspects of stress, texture, microstructure, magnetic correlation performance and the like of the sample by detecting the energy, momentum and other parameters of the emitted neutrons.
Because neutrons generated by a reactor or a spallation source are scattered in the direction of 4 pi, the divergence angle of neutron beam current led out from a pore channel is large, and the measurement of momentum change requires that incident neutrons have a determined direction, a neutron scattering spectrometer generally needs to use a neutron collimator to limit the direction of the incident neutrons, so that the purposes of improving the resolution ratio and improving the signal-to-noise ratio are achieved. Generally, neutron scattering spectrometers require the use of neutron collimators with different neutron divergence angles for different types of experimental measurements.
The neutron divergence angle of the currently used neutron collimator is determined already during manufacturing and cannot be adjusted according to the use requirement; in addition, the neutron collimator is generally arranged in the shielding body, and the collimators with different divergence angles cannot be replaced at any time according to requirements. Therefore, in order to complete different neutron experiments, a common neutron spectrometer can be provided with several common neutron collimators with divergence angles in a shielding body in advance, but due to the fact that the space inside the shielding body is limited, the required various collimators cannot be installed, all the requirements of the neutron experiments cannot be met, and a great deal of expenditure is needed for replacing the collimators for a long time and purchasing the collimators of various types.
Therefore, it is necessary to provide a neutron collimator structure capable of continuously adjusting the divergence angle, which can continuously adjust the neutron divergence angle in one neutron collimator, so that it is not necessary to install a plurality of neutron collimators with different divergence angles, and the adjustment of the divergence angle can be realized in one neutron collimator structure according to the actual requirements, thereby satisfying the operating requirements of various neutron experiments, avoiding the trouble of pre-installing neutron collimators with various divergence angles in a shield and the trouble of replacement, and saving the precious neutron beam time and expense.
Disclosure of Invention
Technical problem to be solved
The present disclosure provides a neutron collimator structure with continuously adjustable divergence angle and a calibration method thereof to at least partially solve the technical problems set forth above.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a neutron collimator structure whose divergence angle is continuously adjustable, including: a plurality of neutron absorption layers 2 are arranged in parallel, and an adjusting column 3 is fixed above and below each neutron absorption layer 2; the adjusting slide block 4 is of a hollow frame structure and is arranged outside the neutron absorbing layers 2; the upper surface and the lower surface of the adjusting slide block 4 are provided with adjusting grooves 5 with the number corresponding to that of the neutron absorption layer 2, the space between the adjusting grooves 5 is distributed in a gradual change manner along the direction in which the neutron absorption layer is arranged in parallel, and the adjusting columns 3 of the neutron absorption layer 2 extend into the adjusting grooves 5; and the driving structure is used for driving the adjusting slide block 4 to move along the direction in which the neutron absorption layers 2 are arranged in parallel so as to change the position of the adjusting column 3 in the adjusting groove 5 to change the distance between the neutron absorption layers 2, thereby realizing the continuous adjustment of the neutron divergence angle.
In some embodiments of the present disclosure, the adjusting slider 4 is mounted on the sliding rail 6 and can move along the sliding rail 6; the adjusting slide block 4 is connected with a lead screw 7 with forward and reverse threads, and under the action of a driving structure, the adjusting slide block 4 moves on the lead screw 7 with the forward and reverse threads to realize the movement along the slide rail 6.
In some embodiments of the present disclosure, the slide rail 6 is fixed to the fixed bracket 8; the screw rod 7 with forward and reverse threads is fixed on the fixed bracket 8; every neutron absorbing layer 2 is installed on neutron absorbing layer frame 1, and the upper and lower side of every neutron absorbing layer frame 1 is all fixed and is provided with adjustment post 3, and neutron absorbing layer frame 1 is connected with fixed bolster 8.
In some embodiments of the present disclosure, a neutron collimator structure with continuously adjustable divergence angle, further comprising: and the positioning structure is used for adjusting the positioning of the sliding block 4.
In some embodiments of the present disclosure, the positioning structure is an absolute encoder, which is mounted on the fixed support 8.
In some embodiments of the present disclosure, a neutron collimator structure with continuously adjustable divergence angle, further comprising: the motion control system realizes the movement control of the adjusting slide block 4 by controlling the driving structure; and a data acquisition system for acquiring data including neutron divergence angle information and positional information of the adjustment slider 4.
In some embodiments of the present disclosure, the drive structure is a servo motor, which is mounted on the fixed support 8.
In some embodiments of the present disclosure, the number of the adjustment sliders 4 is 2, the two adjustment sliders 4 are disposed opposite to each other, and the adjustment grooves 5 on the two adjustment sliders 4 are distributed axially symmetrically along the direction of the normal of the neutron absorption layer 2.
According to another aspect of the present disclosure, there is provided a method for calibrating a divergence angle of a neutron collimator structure according to any one of the neutron collimator structures mentioned in the present disclosure, the method comprising: moving the adjusting slide block 4 to a certain position, and recording the position of the adjusting slide block 4 and a corresponding neutron divergence angle; and obtaining a corresponding relation curve of the divergence angle of the neutron collimator structure and the position of the adjusting slide block 4 by obtaining the neutron divergence angles corresponding to the adjusting slide block 4 at different positions, so as to realize calibration.
In some embodiments of the present disclosure, the position of the adjustment slider 4 is determined by a positioning structure; recording the position of the adjusting slide block 4 and the corresponding neutron divergence angle through a data acquisition system; the adjusting slide 4 is controlled by the motion control system to move to different positions.
(III) advantageous effects
According to the technical scheme, the neutron collimator structure with the continuously adjustable divergence angle and the calibration method thereof have the following beneficial effects:
(1) the neutron collimator structure capable of continuously adjusting the divergence angle based on changing the interval of neutron absorption layers is provided in the industry for the first time, the movable adjusting slide block is arranged, the adjusting grooves with gradually-changed intervals are arranged on the adjusting slide block, the adjusting grooves correspond to a plurality of neutron absorption layers which are arranged in parallel, the adjusting columns (fixed and fixed) on each neutron absorption layer correspond to different positions of the adjusting grooves in the moving process of the adjusting slide block (the adjusting slide block moves), so that the interval of the neutron absorption layers corresponding to the incident direction of neutrons is changed, the continuous adjustment of the neutron divergence angle is realized, the adjustment of the divergence angle can be realized according to the actual requirement in one neutron collimator structure, the using requirements of various neutron experiments are met, the replacement frequency of the collimator can be greatly reduced in the actual application, and the precious neutron beam time is saved, meanwhile, the number of required collimators is reduced, so that a large amount of purchase cost is saved;
(2) the convenience and the accuracy of the adjustment of the interval of the neutron absorption layer are further optimized by arranging the two adjusting slide blocks and enabling the two adjusting slide blocks to be oppositely arranged, namely the adjusting grooves on the two adjusting slide blocks are axially and symmetrically distributed along the direction of the normal of the neutron absorption layer;
(3) the motion control system can precisely control the position of the movable adjusting slide block by remotely controlling the precise rotation of the driving structure (such as a servo motor) through a computer, thereby achieving the effect of adjusting the neutron divergence angle of the neutron collimator structure.
Drawings
Fig. 1 is a schematic structural diagram of a neutron collimator with a continuously adjustable divergence angle according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a neutron absorbing layer in the neutron collimator structure shown in FIG. 1.
Fig. 3 is a top view of an adjustment slide in the neutron collimator structure shown in fig. 1.
Fig. 4 is a schematic perspective view of an adjusting slider according to an embodiment of the disclosure.
Fig. 5 is a schematic diagram illustrating a principle of a neutron collimator structure with a continuously adjustable divergence angle for continuously adjusting a neutron absorption layer interval according to an embodiment of the present disclosure.
[ notation ] to show
1-neutron absorbing layer rim; 2-a neutron absorbing layer;
3-adjusting the column; 4-adjusting the sliding block;
5-adjusting the groove; 6-a slide rail;
7-lead screw with forward and reverse threads; 8-fixing a bracket;
9-servo motor and encoder.
Detailed Description
The utility model provides a neutron collimator structure with continuously adjustable divergence angle and a calibration method thereof, through setting up a movable adjusting slide block, adjusting grooves with gradually distributed intervals are arranged on the adjusting slide block, the adjusting grooves correspond to a plurality of neutron absorbing layers arranged in parallel, an adjusting column (fixed) on each neutron absorbing layer corresponds to different positions of the adjusting grooves in the moving process of the adjusting slide block (the adjusting slide block moves), thereby changing the interval of the neutron absorbing layers corresponding to the neutron incidence direction, realizing the continuous adjustment of the neutron divergence angle, realizing the adjustment of the divergence angle according to the actual requirement in one neutron collimator structure, and meeting the use requirements of various neutron experiments.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings. In the disclosure, the meaning of "the adjusting slide blocks are arranged oppositely" means that the adjusting grooves on the adjusting slide blocks are distributed in mirror symmetry; the terms "adjusting column" and "adjusting groove" are arranged correspondingly, and only one of the two is required to move relatively, in some embodiments, the "adjusting column" does not move, and the "adjusting groove" moves along with the "adjusting slider", so that the relative positions of the "adjusting column" and the "adjusting groove" are changed, and the function of adjusting the neutron absorption layer interval is realized.
In a first exemplary embodiment of the present disclosure, a neutron collimator structure with continuously adjustable divergence angle is provided.
Fig. 1 is a schematic structural diagram of a neutron collimator with a continuously adjustable divergence angle according to an embodiment of the present disclosure.
Referring to fig. 1, a neutron collimator structure with continuously adjustable divergence angle of the present disclosure includes: a plurality of neutron absorption layers 2 are arranged in parallel, and an adjusting column 3 is fixed above and below each neutron absorption layer 2; the adjusting slide block 4 is of a hollow frame structure and is arranged outside the neutron absorbing layers 2; the upper surface and the lower surface of the adjusting slide block 4 are provided with adjusting grooves 5 with the number corresponding to that of the neutron absorption layer 2, the space between the adjusting grooves 5 is distributed in a gradual change manner along the direction in which the neutron absorption layer is arranged in parallel, and the adjusting columns 3 of the neutron absorption layer 2 extend into the adjusting grooves 5; and the driving structure is used for driving the adjusting slide block 4 to move along the direction in which the neutron absorption layers 2 are arranged in parallel so as to change the position of the adjusting column 3 in the adjusting groove 5 to change the distance between the neutron absorption layers 2, thereby realizing the continuous adjustment of the neutron divergence angle.
The number of the neutron absorption layers 2 is correspondingly set according to actual needs, the number of the neutron absorption layers is not limited in the disclosure, and certainly, the neutron absorption layers are at least 2 as can be known by those skilled in the art.
In a preferred embodiment, the number of the adjusting sliders 4 is 2, the two adjusting sliders 4 are oppositely arranged, and the adjusting grooves 5 on the two adjusting sliders 4 are axially symmetrically distributed along the direction of the normal of the neutron absorption layer 2, as shown in fig. 1 and 5.
The following describes in detail the various parts of the neutron collimator structure with continuously adjustable divergence angle and the principle of realizing the continuous adjustment of the divergence angle, which are shown in the embodiments of the present disclosure, with reference to the accompanying drawings.
FIG. 2 is a schematic diagram of a neutron absorbing layer in the neutron collimator structure shown in FIG. 1.
Referring to fig. 2, in this embodiment, each neutron absorption layer 2 is installed on a neutron absorption layer frame 1, the neutron absorption layer frame 1 plays a role in supporting and fixing the neutron absorption layer 2, and the neutron absorption layer frame 1 is connected with a fixing support 8. The upper and lower sides of each neutron absorption layer frame 1 are fixedly provided with an adjusting column 3, and the relative position change between the adjusting column 3 and the adjusting groove 5 can adjust the distance between each neutron absorption layer 2. In fig. 1 and 2, 2 adjusting sliding blocks are used, two adjusting columns 3 are fixed above and below each neutron absorption layer 2 for illustration, and in an actual device structure, the adjusting sliding blocks and the adjusting columns can be flexibly arranged as required.
Fig. 3 is a top view of an adjustment slide in the neutron collimator structure shown in fig. 1. Fig. 4 is a schematic perspective view of an adjusting slider according to an embodiment of the disclosure.
Referring to fig. 1, 3 and 4, in an embodiment, the adjustment slider 4 is a hollow frame structure and is disposed outside the neutron absorption layers 2; the upper surface and the lower surface of the adjusting slide block 4 are provided with adjusting grooves 5 corresponding to the neutron absorption layers 2 in number, and the distance between the adjusting grooves 5 is gradually distributed along the direction parallel to the neutron absorption layers. As shown in fig. 1, the alignment rods 3 of the neutron absorption layer 2 correspondingly extend into the alignment slots 5.
As shown in fig. 1, in the present embodiment, the adjusting slider 4 is mounted on 4 sliding rails 6 and can move along the sliding rails 6; the adjusting slide block 4 is connected with a lead screw 7 with forward and reverse threads, and under the action of a driving structure, the adjusting slide block 4 moves on the lead screw 7 with the forward and reverse threads to realize the movement along the slide rail 6. As shown in fig. 4, 6 through holes are correspondingly arranged on the adjusting slider 4, wherein the through holes at 4 corners are used for installing the sliding rail 6; the middle perforation is used for installing a screw rod 7 with forward and reverse threads.
Of course, the number of the slide rails 6 can also be flexibly adjusted according to actual needs, and is not limited to this embodiment.
In some embodiments of the present disclosure, the drive structure is a servo motor, which is mounted on the fixed support 8.
In some embodiments of the present disclosure, a neutron collimator structure with continuously adjustable divergence angle, further comprising: and the positioning structure is used for adjusting the positioning of the sliding block 4. For example, the positioning structure is an encoder, preferably an absolute encoder, which is mounted on the stationary support 8. In some embodiments, the absolute encoder is mounted on the servomotor, together with the servomotor, on the fixed support 8, and therefore, for simplicity of illustration, the servomotor (drive structure) and the encoder (positioning structure) are illustrated together, the servomotor and the encoder being indicated by reference numeral 9 in fig. 1.
It should be noted that the structure for realizing the movement of the adjusting slider 4 is not limited to the above embodiment, and any structure capable of realizing the movement of the adjusting slider 4 is within the scope of the present disclosure.
In some embodiments of the present disclosure, a neutron collimator structure with continuously adjustable divergence angle, further comprising: the device comprises a motion control system and a data acquisition system, wherein the motion control system realizes the movement control of the adjusting slide block 4 by controlling a driving structure; the data acquisition system is used for acquiring data, and the data comprises neutron divergence angle information and position information of the adjusting slide block 4.
The motion control system can realize the motion control of the adjusting slide block 4 through a computer remote control driving structure. For example, the motion control system can remotely control the servo motor to precisely rotate through a computer, so that the position of the movable adjusting slide block is precisely controlled, and the effect of adjusting the neutron divergence angle of the neutron collimator structure is further achieved.
Of course, in other embodiments, the motion control system may control the driving structure by other control methods, so as to control the movement of the adjusting slider.
In a preferred embodiment, the number of the adjusting sliders 4 is 2, the two adjusting sliders 4 are oppositely arranged, and the adjusting grooves 5 on the two adjusting sliders 4 are axially symmetrically distributed along the direction of the normal of the neutron absorption layer 2, so that the convenience and accuracy of adjusting the spacing between the neutron absorption layers are further optimized, as shown in fig. 1 and 5.
In one example, as shown in fig. 1, the two adjusting sliders 4 are opposite to each other at the sides where the adjusting grooves 5 are distributed sparsely, the densely distributed sides are back to back, the two adjusting sliders 4 are moved outwards (the right side is outward along the y direction in fig. 1, and the left side is outward along the negative direction of y) at the same time, so as to adjust the distance, and the two adjusting sliders 4 are moved inwards at the same time, so as to adjust the distance.
Fig. 5 is a schematic diagram illustrating a principle of a neutron collimator structure with a continuously adjustable divergence angle for continuously adjusting a neutron absorption layer interval according to an embodiment of the present disclosure.
In order to simplify the drawing and achieve emphasis on the purpose, in the schematic diagram of fig. 5, the adjustment grooves 5 in the adjustment sliders are illustrated separately, some parts are enlarged (for example, adjustment columns) and only the adjustment columns 3 above the neutron absorption layer 2 are illustrated (the adjustment columns below correspond to the adjustment grooves on the lower surface of the adjustment sliders, which are not illustrated), in this embodiment, 2 adjustment sliders are oppositely arranged, the adjustment grooves 5 on two adjustment sliders 4 are distributed along the direction of the normal line of the neutron absorption layer 2, the direction of the normal line of the neutron absorption layer is illustrated by the chain line in fig. 5, and the adjustment grooves 5 on the upper surface of one of the adjustment sliders and the adjustment columns above the neutron absorption layer 2 are illustrated in principle in fig. 5. In fig. 5, double arrows indicate that two adjustment sliders can be moved in a direction in which the neutron absorption layers 2 are arranged in parallel. Meanwhile, for the sake of illustrating the principle, the adjusting groove is intentionally far away from the adjusting column in fig. 5, the dashed line indicates the relative relationship between the adjusting groove and the adjusting column, and in the actual structure, the adjusting column will extend into the adjusting groove along the vertical dashed line (the vertical direction in the drawing).
As shown in fig. 5, when the adjusting slide is at a certain position, the adjusting column 3 will be at a certain position of the adjusting slot 5, for example: the adjusting columns 3 of the neutron absorption layer arranged in parallel are located on an A-A line relative to the adjusting slide block at the moment, the position of each adjusting column 3 is shown as the position where two dotted lines intersect in FIG. 5, and along with the movement of the position of the adjusting slide block along a double arrow, because the space between the adjusting grooves 5 is gradually distributed along the direction in which the neutron absorption layers are arranged in parallel, the position of the adjusting columns 3 of the neutron absorption layer arranged in parallel relative to the A-A line corresponding to the adjusting slide block at the moment is changed relatively, the distance between the corresponding intersections is also changed, that is, the space of the neutron absorption layer 2 is changed by changing the position of the adjusting column 3 in the adjusting groove 5, thereby realizing the continuous adjustment of the neutron divergence angle. In addition, two adjusting sliders are arranged oppositely, one side of each adjusting slider, in which the adjusting grooves are densely (or sparsely) distributed, is opposite to one side of each adjusting slider, in which the adjusting grooves are densely (or sparsely) distributed, and only the two adjusting sliders need to be adjusted to move the same distance inwards or outwards at the same time, so that convenience and accuracy of adjusting the spacing between the neutron absorption layers are further optimized.
The contents of the first embodiment are now described.
In a second exemplary embodiment of the present disclosure, there is provided a method for calibrating a divergence angle, for calibrating any one of the neutron collimator structures mentioned in the present disclosure, the method comprising: moving the adjusting slide block 4 to a certain position, and recording the position of the adjusting slide block 4 and a corresponding neutron divergence angle; and obtaining a corresponding relation curve of the divergence angle of the neutron collimator structure and the position of the adjusting slide block 4 by obtaining the neutron divergence angles corresponding to the adjusting slide block 4 at different positions, so as to realize calibration.
In some embodiments of the present disclosure, the position of the adjustment slider 4 is determined by a positioning structure (such as an absolute encoder); recording the position of the adjusting slide block 4 and the corresponding neutron divergence angle through a data acquisition system; the adjusting slide 4 is controlled by the motion control system to move to different positions.
In one example, the divergence angle calibration and transmittance tests of different divergence angles were performed on the continuously adjustable divergence angle neutron collimator structure shown in the present disclosure using a neutron collimator testing apparatus before use.
The method mainly comprises the following steps of calibrating the divergence angle and testing the transmissivity of different divergence angles of the neutron collimator structure with the continuously adjustable divergence angle, which is disclosed by the disclosure, by using a neutron collimator testing device (the testing method is referred to as N.I. M.108(1973) -107-:
placing a neutron performance testing device of a neutron collimator near a neutron scattering spectrometer in work, and taking redundant unused transmission neutron beams as a testing neutron source; adjusting the beam limiting size of the two-dimensional adjustable slit according to the size of the neutron collimator structure with the divergence angle to be tested being continuously adjustable;
secondly, a neutron collimator with a known neutron divergence angle is placed on a neutron collimator fixing seat close to an incident beam of the test device, and the rotary table, the height adjusting device, the transverse slide rail and the longitudinal slide rail are adjusted through the control system, so that the neutron collimator is aligned to the two-dimensional adjustable slit;
thirdly, placing the neutron collimator structure with the divergence angle to be tested, which is continuously adjustable (called the neutron collimator structure to be tested for short), on the other neutron collimator fixing seat, and adjusting the rotating table, the height adjusting device, the transverse slide rail and the longitudinal slide rail through the control system to align the neutron collimator structure to be tested with the neutron collimator with the known neutron divergence angle and the two-dimensional adjustable slit (the light paths are in the same horizontal plane);
fourthly, the adjusted position is set to be 0 degree, the control system adjusts the rotating platform to enable the neutron collimator structure to be tested to rotate from-2 degrees to 2 degrees, the rotating step distance is 0.02 degree, the neutron detection system obtains primary neutron counting to obtain a rocking curve of the neutron collimator structure to be tested, and the neutron divergence angle of the neutron collimator structure to be tested is calculated according to the rocking curve;
and (V) changing the distance between the neutron absorption layers in the neutron collimator structure to be tested, changing the distance between the neutron absorption layers by changing the position of the adjusting slide block, and repeating the above test steps to measure the neutron divergence angle of different distances between the neutron absorption layers. Recording the positions of the adjusting slide blocks corresponding to different neutron absorption layer intervals and the corresponding divergence angles, and obtaining a relation curve of neutron divergence angles and corresponding codes of the positions of the neutron collimator structure to be tested after measurement for many times.
Taking down the neutron collimator structure to be tested from the neutron collimator fixing seat, and acquiring the neutron count at the moment through a neutron detection system; calculating the neutron transmittance of the neutron collimator structure according to the neutron count and the maximum neutron counts at the different positions obtained in the step (five), and completing the neutron performance calibration;
and (seventhly), after calibration is completed, the collimator can be placed in a shield of the neutron scattering spectrometer for use, and in the using process, the adjustment can be performed according to the neutron divergence angle and the coded curve determined in the front according to the using requirements, so that the divergence angle of the neutron collimator structure with the continuously adjustable divergence angle is adjusted to the required size.
In summary, the present disclosure provides a neutron collimator structure with a continuously adjustable divergence angle and a calibration method thereof, and provides a neutron collimator structure with a continuously adjustable divergence angle based on changing the interval of neutron absorption layers for the first time in the industry, by providing a movable adjusting slider, and providing adjusting grooves with gradually distributed intervals on the adjusting slider, the adjusting grooves correspond to a plurality of neutron absorption layers arranged in parallel, and an adjusting column (fixed and fixed) on each neutron absorption layer corresponds to different positions of the adjusting grooves in the moving process of the adjusting slider (moving of the adjusting slider), so as to change the interval of the neutron absorption layers corresponding to the incident direction of neutrons, and realize the continuous adjustment of the neutron divergence angle, and the adjustment of the divergence angle according to the actual requirements can be realized in one neutron collimator structure, thereby satisfying the use requirements of various neutron experiments, and greatly reducing the replacement frequency of the collimator in the actual application, thereby saving precious beam current during neutron Meanwhile, the number of the required collimators is reduced, so that a large amount of purchase cost is saved; the convenience and the accuracy of the adjustment of the interval of the neutron absorption layer are further optimized by arranging the two adjusting slide blocks and enabling the two adjusting slide blocks to be oppositely arranged, namely the adjusting grooves on the two adjusting slide blocks are axially and symmetrically distributed along the direction of the normal of the neutron absorption layer; the motion control system can precisely control the position of the movable adjusting slide block by remotely controlling the precise rotation of the driving structure (such as a servo motor) through a computer, thereby achieving the effect of adjusting the neutron divergence angle of the neutron collimator structure.
It should be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, mentioned in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "comprises" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (11)
1. A neutron collimator structure with continuously adjustable divergence angle, comprising:
a plurality of neutron absorption layers (2) are arranged in parallel, and an adjusting column (3) is fixed above and below each neutron absorption layer (2);
the adjusting slide block (4) is of a hollow frame structure and is arranged outside the neutron absorbing layers (2); the upper surface and the lower surface of the adjusting slide block (4) are respectively provided with adjusting grooves (5) with the number corresponding to that of the neutron absorption layer (2), the space between every two adjusting grooves (5) is gradually distributed along the direction in which the neutron absorption layers are arranged in parallel, and adjusting columns (3) of the neutron absorption layers (2) extend into the adjusting grooves (5); and
and the driving structure is used for driving the adjusting slide block (4) to move along the direction in which the neutron absorption layers (2) are arranged in parallel so as to change the position of the adjusting column (3) in the adjusting groove (5) to change the distance between the neutron absorption layers (2), thereby realizing the continuous adjustment of the neutron divergence angle.
2. The neutron collimator structure of claim 1,
the adjusting slide block (4) is arranged on a slide rail (6) and can move along the slide rail (6);
the adjusting sliding block (4) is connected with a lead screw (7) with forward and reverse threads, and under the action of a driving structure, the adjusting sliding block (4) moves on the lead screw (7) with the forward and reverse threads to realize the movement along the sliding rail (6).
3. The neutron collimator structure of claim 2,
the slide rail (6) is fixed on the fixed support (8);
the screw rod (7) with the forward and reverse threads is fixed on the fixed bracket (8);
every piece neutron absorbing layer (2) is installed on neutron absorbing layer frame (1), and the upper and lower side of every neutron absorbing layer frame (1) all is fixed and is provided with adjustment post (3), neutron absorbing layer frame (1) with fixed bolster (8) are connected.
4. The neutron collimator structure of claim 1, further comprising:
and the positioning structure is used for positioning the adjusting slide block (4).
5. The neutron collimator structure of claim 3, further comprising:
a positioning structure for positioning the adjusting slide (4); the positioning structure is an absolute encoder which is arranged on the fixed support (8).
6. The neutron collimator structure of claim 1, further comprising:
the motion control system controls the driving structure to realize the movement control of the adjusting slide block (4); and
and the data acquisition system is used for acquiring data, and the data comprises neutron divergence angle information and position information of the adjusting slide block (4).
7. The neutron collimator structure of claim 3, wherein the driving structure is a servo motor mounted on the fixed support (8).
8. The neutron collimator structure according to any one of claims 1 to 7, characterized in that the number of the adjusting sliders (4) is 2, the two adjusting sliders (4) are arranged oppositely, and the adjusting grooves (5) on the two adjusting sliders (4) are distributed axially symmetrically along the normal direction of the neutron absorbing layer (2).
9. A method for calibrating a neutron collimator structure of any one of claims 1 to 8, comprising:
moving the adjusting slide block (4) to a certain position, and recording the position of the adjusting slide block (4) and a corresponding neutron divergence angle; and
and obtaining a corresponding relation curve of the divergence angle of the neutron collimator structure and the position of the adjusting slide block (4) by obtaining the neutron divergence angle corresponding to the adjusting slide block (4) at different positions, thereby realizing calibration.
10. A method for calibrating a neutron collimator structure of claim 4 or 5, comprising:
moving the adjusting slide block (4) to a certain position, and recording the position of the adjusting slide block (4) and a corresponding neutron divergence angle; and
obtaining a corresponding relation curve of the divergence angle of the neutron collimator structure and the position of the adjusting slide block (4) by obtaining neutron divergence angles corresponding to the adjusting slide block (4) at different positions, and realizing calibration;
wherein the position of the adjusting slide (4) is determined by the positioning structure.
11. A method for calibrating a neutron collimator structure of claim 6, comprising:
moving the adjusting slide block (4) to a certain position, and recording the position of the adjusting slide block (4) and a corresponding neutron divergence angle; and
obtaining a corresponding relation curve of the divergence angle of the neutron collimator structure and the position of the adjusting slide block (4) by obtaining neutron divergence angles corresponding to the adjusting slide block (4) at different positions, and realizing calibration;
wherein the position of the adjusting slide block (4) and the corresponding neutron divergence angle are recorded by the data acquisition system;
and controlling the adjusting slide block (4) to move to different positions through the motion control system.
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| CN112927834B (en) * | 2021-01-27 | 2022-11-22 | 散裂中子源科学中心 | Diaphragm structure and micro-angle neutron scattering spectrometer |
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