CN114649105A - Radial collimator for neutron diffraction spectrometer - Google Patents
Radial collimator for neutron diffraction spectrometer Download PDFInfo
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- CN114649105A CN114649105A CN202210247433.1A CN202210247433A CN114649105A CN 114649105 A CN114649105 A CN 114649105A CN 202210247433 A CN202210247433 A CN 202210247433A CN 114649105 A CN114649105 A CN 114649105A
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- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
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Abstract
The utility model provides a radial collimator for neutron diffraction spectrometer, includes collimator frame, absorption film and space bar, and the collimator frame is square loudspeaker form, and the front and back terminal surface is the face of cylinder, the axis coincidence of front and back terminal surface, and the absorption film is trapezoidal film and material and is strong neutron absorbing material, and the space bar is rectangular deformation thickness sheet metal, and a plurality of absorption films and space bar pile up in turn and locate the collimator frame. Set up absorption film and space bar in square horn shape collimator frame, the coverage of collimator includes the coverage of detector, and the collimator sets up between neutron diffraction spectrometer's sample center point and detector, compares in not setting up radial collimator, and the background noise greatly reduced of spectrometer experiment, data accuracy and spectrometer resolution ratio are showing and are improving.
Description
Technical Field
The invention relates to the technical field of neutron collimators, in particular to a radial collimator for a neutron diffraction spectrometer.
Background
Neutrons and X-rays are powerful means for humans to explore the microstructure of matter, and neutron sources are large scientific devices for generating neutrons. According to different generation modes of neutron beams, neutron sources can be divided into reactor neutron sources and accelerator-based pulse type neutron sources. The neutron diffraction spectrometer is an experimental terminal of a neutron source, and the basic principle of the neutron diffraction spectrometer is as follows: the proton bombards the heavy metal target to generate spallation reaction, the generated neutrons reach the sample through the transportation line and react with the sample to be scattered again, and the neutron detector is adopted to collect neutron signals at a specific angle, so that the microstructure of the sample is reversely deduced.
Due to the particularity of the neutron beam, a part of the neutron beam will be scattered or react with other non-sample components, and the part of the neutron signal becomes background noise. The signal-to-noise ratio is an important factor for determining the experimental resolution and accuracy of the spectrometer. Data have proved that after a radial collimator is arranged between a sample and a neutron detector, the background noise is greatly reduced, and the data precision and the spectrometer resolution are obviously improved. In summary, the radial collimator is the core device in the neutron diffraction spectrometer that determines the quality and accuracy of the test signal.
However, various collimators on the market, such as cylindrical, round-hole or soller collimators, are all neutron collimators arranged on incident neutron beams, and are not suitable for the diffracted neutron direction of a neutron diffraction spectrometer.
Disclosure of Invention
In order to solve the technical problem, the application provides a radial collimator for a neutron diffraction spectrometer.
According to a first aspect, there is provided in an embodiment a radial collimator for a neutron diffraction spectrometer, comprising:
the collimator comprises a collimator frame, a collimator frame and a collimator frame, wherein the front end face and the rear end face of the collimator frame are both cylindrical surfaces, the axes of the front end face and the rear end face of the collimator frame are overlapped, and the area of the front end face of the collimator frame is smaller than that of the rear end face of the collimator frame;
the absorption film is a trapezoidal thin film, and the material of the absorption film is a strong neutron absorption material;
the spacing bars are long-strip-shaped variable-thickness thin plates;
a plurality of absorption films and a plurality of spacing strips are alternately stacked in the collimator frame;
the horizontal coverage angle of the absorption film is larger than or equal to that of the neutron diffraction spectrometer detector, and the vertical coverage angle of the absorption film is larger than or equal to that of the neutron diffraction spectrometer detector.
In one embodiment, the collimator frame includes a front upper beam, a front lower beam, a rear upper beam, a rear lower beam, and two side plates symmetrically disposed, where the front upper beam, the front lower beam, the rear upper beam, and the rear lower beam are circular-arc-shaped, the side plates are trapezoidal plates, two ends of the front upper beam, the front lower beam, the rear upper beam, and the rear lower beam are respectively connected to the side plates on two sides, and four corners of the absorption film and the spacer are respectively connected to the front upper beam, the front lower beam, the rear upper beam, and the rear lower beam.
In one embodiment, L-shaped clamping grooves are formed at four corners of the absorption film and the spacing bars; a through groove is formed in the front-end upper beam, a plurality of front-end L-shaped buckles are arranged in the through groove of the front-end upper beam, and the front-end L-shaped buckles are buckled with the corresponding groups of L-shaped clamping grooves of the absorption films and the spacing strips; a through groove is formed in the rear end upper beam, a plurality of rear end L-shaped buckles are arranged in the through groove of the rear end upper beam, and the rear end L-shaped buckles are buckled with the corresponding groups of L-shaped clamping grooves of the absorption films and the spacing strips; the front end underbeam and the rear end underbeam are provided with L-shaped buckles, and the L-shaped buckles are buckled with the L-shaped clamping grooves of the absorption film and the spacing strips.
In an embodiment, the side plates include a fixed side plate and a stretching side plate, the stretching side plate is disposed above the fixed side plate, the stretching side plate can move in a vertical direction relative to the fixed side plate, the stretching side plate is connected to the front end upper beam and the rear end upper beam, and the fixed side plate is connected to the front end lower beam and the rear end lower beam.
In one embodiment, a plurality of jack bolts in the vertical direction are arranged between the stretching side plate and the fixed side plate, and the jack bolts penetrate through the stretching side plate.
In one embodiment, the fixed side plate is provided with a plurality of blind hole pins, and the blind hole pins are arranged opposite to the jackscrew bolts.
In one embodiment, a positioning guide pin is arranged between the stretching side plate and the fixed side plate.
In one embodiment, the method further comprises: tensile double-screw bolt, tensile double-screw bolt is arc double-screw bolt, and is a plurality of tensile double-screw bolt runs through all the absorbing film with space bar and both sides the curb plate, be equipped with the counter bore on the curb plate, be equipped with the nut in the counter bore, the nut with tensile double-screw bolt is connected, tensile curb plate with all worn on the fixed curb plate tensile double-screw bolt.
In an embodiment, two ends of the front end upper beam, the front end lower beam, the rear end upper beam and the rear end lower beam are respectively provided with a straight hole slot, the front end upper beam, the front end lower beam, the rear end upper beam and the rear end lower beam are connected with the side plate through bolts, and the bolts penetrate through the straight hole slots.
In an embodiment, the front end L-shaped buckle and the rear end L-shaped buckle are provided with threaded through holes, the threaded through holes are communicated with the through grooves, an auxiliary stretching cover plate is arranged above the rear end L-shaped buckle, and the auxiliary stretching cover plate is provided with a plurality of through holes corresponding to the threaded through holes in the rear end L-shaped buckle.
According to the radial collimator for the neutron diffraction spectrometer of the embodiment, the absorption film and the spacing bars are arranged in the square horn-shaped collimator frame, the coverage range of the collimator comprises the coverage range of the detector, the collimator is arranged between the sample center point of the neutron diffraction spectrometer and the detector, and compared with the radial collimator which is not arranged, the background noise of a spectrometer experiment is greatly reduced, and the data precision and the spectrometer resolution are obviously improved.
Drawings
FIG. 1 is a schematic diagram of a radial collimator for a neutron diffraction spectrometer in one embodiment;
FIG. 2 is a schematic diagram in partial cross-section of a side plate of a radial collimator for a neutron diffraction spectrometer in one embodiment;
fig. 3 is a schematic diagram illustrating a connection state of a front-end L-shaped buckle of a radial collimator for a neutron diffraction spectrometer in an embodiment.
Description of reference numerals: 1. a collimator frame; 2. an absorbent film; 3. a spacer bar; 41. a front end upper beam; 411. a front end L-shaped buckle; 42. a front end lower beam; 51. a rear end upper beam; 511. a rear end L-shaped buckle; 512. auxiliary stretching of the cover plate; 52. a rear end lower beam; 61. stretching the side plates; 62. fixing the side plate; 63. a jackscrew bolt; 64. a blind hole pin; 7. stretching the stud; 71. a countersunk hole; 72. a nut; 10. an L-shaped clamping groove; 20. a through groove; 30. a straight hole groove; 40. a bolt; 50. a threaded through bore.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the described features, operations, or characteristics may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The ordinal numbers used herein for the components, such as "first," "second," etc., are used merely to distinguish between the objects described, and do not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In a broad sense, the radial collimator of the present invention is a class of precision optical devices. The radial collimator disclosed by the invention is different from collimators used for optical equipment such as visible light and X-ray, and has the main function of collimating neutron beam lines, and the core material of the radial collimator is a strong neutron absorbing material. The radial collimator is arranged in the direction of diffraction neutrons, namely the radial direction, so that the radial collimator is called as a radial collimator and has higher requirements on the precision of the collimator.
For a neutron diffraction spectrometer, the central point of the sample is a point in space, which is the tail end of the neutron beam and is the central point of the reaction between the neutron beam and the sample. The neutron detector covers the center point of the sample at a certain space coverage angle, and the distance (second flight distance) between the neutron detector and the center point of the sample is from hundreds of millimeters to meters. The radial collimator is arranged in a space between a sample central point and the detector, the appearance of the radial collimator is a square horn with a small front end and a large rear end, a front end focus is the sample central point, the rear end faces the neutron detector, the opening angles of the left plane and the right plane of the radial collimator correspond to the horizontal coverage angle of the neutron detector, and the opening angles of the upper plane and the lower plane of the radial collimator correspond to the vertical coverage angle of the neutron detector. The core component of the radial collimator is an absorption film which contains strong neutron absorption materials and needs to be accurately fixed in a frame according to a certain angle.
In this application embodiment, a radial collimator for neutron diffraction spectrometer includes collimator frame, absorption film and space bar, and the collimator frame is square loudspeaker form, and the front and back terminal surface is the face of cylinder, the axis coincidence of front and back terminal surface, and the absorption film is trapezoidal film and material and is strong neutron absorbing material, and the space bar is rectangular deformation thickness sheet metal, and a plurality of absorption films and space bar pile up in turn and locate in the collimator frame. Set up absorption film and space bar in square horn shape collimator frame, the coverage of collimator includes the coverage of detector, and the collimator sets up between neutron diffraction spectrometer's sample center point and detector, compares in not setting up radial collimator, and the background noise greatly reduced of spectrometer experiment, data accuracy and spectrometer resolution ratio are showing and are improving.
The present application is illustrated by the following specific examples.
The first embodiment is as follows:
as shown in fig. 1 to 3, in an embodiment of the present application, a radial collimator for a neutron diffraction spectrometer is provided, including: collimator frame 1, absorbing film 2 and spacer 3. The front end face and the rear end face of the collimator frame 1 are both cylindrical surfaces, the axes of the front end face and the rear end face of the collimator frame 1 are coincident, the area of the front end face of the collimator frame 1 is smaller than that of the rear end face of the collimator frame 1, the collimator frame is in a square horn shape, when the radial collimator is used, the axes of the front end face and the rear end face of the collimator frame 1 penetrate through a sample central point, namely, the focus of the front end face of the collimator frame 1 is the sample central point. The absorption film 2 is a trapezoidal thin film, and the material of the absorption film 2 is a strong neutron absorption material. The spacing bars 3 are strip-shaped thin plates with variable thickness, preferably, the front ends of the spacing bars 3 are thinner, the rear ends of the spacing bars are thicker, and the thickness of the spacing bars is uniformly increased. A plurality of absorption membranes 2 and spacing bars 3 are alternately stacked in a collimator frame 1, the performance of the absorption membranes 2 is related to the thickness of the absorption membranes 2, the thinner the thickness is, the better the performance is, preferably, the thickness of the absorption membranes 2 is 0.05-0.1 mm, the spacing bars 3 are used for spacing the absorption membranes 2, the gap between the adjacent absorption membranes 2 is one of core technical indexes of a radial collimator, the technology is related to the thickness of the spacing bars 3, and therefore the precision requirement of the thickness of the front end and the rear end of each spacing bar 3 is higher. The thickness of the spacer is obtained by physical calculation and is not limited in this application. The front and back terminal surface that sets up a plurality of absorption film 2 in collimator frame 1 can constitute the discontinuity, be the covering surface of certain contained angle, the horizontal coverage angle of absorption film 2 is more than or equal to the horizontal coverage angle of neutron diffraction spectrometer detector, the perpendicular coverage angle of absorption film 2 is more than or equal to the perpendicular coverage angle of neutron diffraction spectrometer detector, the coverage that radial collimator is more than or equal to neutron diffraction spectrometer detector promptly, in order to guarantee radial collimator's effective work, preferably, the plane is opened the angle and is corresponded with neutron diffraction spectrometer detector horizontal coverage angle about radial collimator, equally, the plane is opened the angle and is corresponded with the perpendicular coverage angle of neutron diffraction spectrometer detector about radial collimator.
In one embodiment, the collimator frame 1 includes a front upper beam 41, a front lower beam 42, a rear upper beam 51, a rear lower beam 52, and two side plates symmetrically disposed, where the front upper beam 41, the front lower beam 42, the rear upper beam 51, and the rear lower beam 52 are circular arc-shaped, the side plates are trapezoidal plates, two ends of the front upper beam 41, the front lower beam 42, the rear upper beam 51, and the rear lower beam 52 are respectively connected to the side plates on two sides, and four corners of the absorption film 2 and the spacer 3 are respectively connected to the front upper beam 41, the front lower beam 42, the rear upper beam 51, and the rear lower beam 52. The side plates should be thick to ensure sufficient rigidity.
In one embodiment, L-shaped slots 10 are formed at four corners of the absorption film 2 and the spacer 3. The front end upper beam 41 is provided with a through groove 20, the through groove 20 of the front end upper beam 41 is internally provided with a plurality of front end L-shaped buckles 411, and the front end L-shaped buckles 411 are buckled with the L-shaped clamping grooves 10 of the corresponding arrays of the absorption films 2 and the spacing bars 3. The rear end upper beam 51 is provided with a through groove 20, the through groove 20 of the rear end upper beam 51 is internally provided with a plurality of rear end L-shaped buckles 511, and the rear end L-shaped buckles are buckled with the corresponding arrays of the L-shaped clamping grooves 10 of the absorption films 2 and the spacing bars 3. The front end lower beam 42 and the rear end lower beam 52 are provided with L-shaped buckles, the L-shaped buckles on the front end lower beam 42 and the rear end lower beam 52 are buckled with the L-shaped clamping grooves 10 of the absorption film 2 and the spacing strips 3, preferably, the L-shaped buckle on the front end lower beam 42 is arranged on the outer side of the arc of the front end lower beam 42, and the L-shaped buckle on the rear end lower beam 52 is arranged on the inner side of the arc of the rear end lower beam 52.
In one embodiment, the side plates include a stretching side plate 61 and a fixing side plate 62, the stretching side plate 61 is disposed above the fixing side plate 62, and the stretching side plate 61 can move in a vertical direction relative to the fixing side plate 62. Tensile curb plate 61 is connected with front end upper beam 41 and rear end upper beam 51, fixed curb plate 62 is connected with front end underbeam 42 and rear end underbeam 52, when tensile curb plate 61 upward movement, tensile curb plate 61 drives front end upper beam 41 and rear end upper beam 51 upward movement, and then drives front end L type buckle 411 and rear end L type buckle 422 upward movement, tensile absorption film 2 and space bar 3, make absorption film 2 level and smooth, the clearance is even, improve the precision of radial collimater. The L-shaped snaps on the front end lower beam 42 and the rear end lower beam 52 serve to fix the absorbent film 2 and the spacer 3. The front end face and the rear end face of the absorption film 2 are arc-shaped faces, so that the tension of the absorption film 2 along the arc line subsection is the same everywhere in the stretching process, and the fold breakage in the stretching process is avoided.
In one embodiment, a plurality of jack bolts 63 are vertically arranged between the tension side plate 61 and the fixed side plate 62, and the jack bolts 63 penetrate through the tension side plate 61. When it is desired to move the tension side plate 61 upward, a moment is applied to the jackscrew bolt 63, which is converted into an axial force, separating the tension side plate 61 from the fixed side plate 62.
In one embodiment, due to the increase of the torque applied to the jack screw bolt 63, the axial force of the jack screw bolt 63 is gradually increased, and due to the interaction of the forces, the bottom surface of the jack screw bolt 63 necessarily applies the same force to the upper surface of the fixed side plate 62, in order to prevent the upper end surface of the fixed side plate 62 from being damaged by the jack screw bolt 63, the fixed side plate 62 is provided with a plurality of blind hole pins 64, the blind hole pins 64 are arranged below the jack screw bolt 63, and the blind hole pins 64 and the jack screw bolt 63 are arranged in a one-to-one correspondence manner. The rigidity of the material of the blind pin 63 should be greater than the rigidity of the material of the jack bolt 63 and the fixed side plate 62, so that the contact surface of the blind pin 63 and the jack bolt 64 can be lubricated with oil, and the resistance during stretching can be reduced.
In one embodiment, in order to ensure that the moving direction of the stretching side plate 61 is kept vertical when the stretching side plate 61 is separated from the fixed side plate 62, a positioning guide pin is arranged between the stretching side plate 61 and the fixed side plate 62 to perform positioning and guiding functions, thereby ensuring smooth stretching of the stretching side plate 61.
In an embodiment, the radial collimator further includes a plurality of stretching studs 7, the stretching studs 7 are arc-shaped studs, the plurality of stretching studs 7 penetrate through all the absorbent films 2, the spacer 3 and the side plates on both sides, a countersunk hole 71 is formed in each side plate, a nut 72 is arranged in each countersunk hole, the nut 72 is connected with the stretching stud 7, and the stretching studs 72 penetrate through the stretching side plate 61 and the fixing side plate 62. The arc length corresponding angle of the stretching studs 7 is larger than the horizontal coverage angle of the radial collimator, and the arc radius and the length of each stretching stud 7 are calculated according to the position. When the stretching side plate 61 moves upwards, the stretching studs 7 penetrating through the stretching side plate 61 are driven to move upwards, the absorbent film 2 and the spacing bars 3 are stretched, and the stretching studs 72 penetrating through the fixed side plate 62 play a role in fixing the absorbent film 2 and the spacing bars 3. Preferably, a plurality of stretching studs 7 with gradually increased radius and arc length are uniformly arranged on the stretching side plate 61 from the front end to the rear end, and the same number of stretching studs 7 with gradually increased radius and arc length are uniformly arranged on the lower edge of the fixed side plate 62 from the front end to the rear end. In some embodiments, the cross-sectional shape of the part of the tensile stud 7 penetrating into the absorbent film 2 and the spacer 3 may be non-circular, and both ends of the tensile stud 7 need to be connected with the nuts 72, so that the cross-sectional shape of the part of the tensile stud 7 penetrating into the absorbent film 2 and the spacer 3 needs to be circular, for example, the cross-section of the part of the tensile stud 7 penetrating into the absorbent film 2 and the spacer 3 may be rectangular, and the cross-section of the part of the tensile stud 7 penetrating into the absorbent film 2 and the spacer 3 may be circular.
In one embodiment, the front end upper beam 41, the front end lower beam 42, the rear end upper beam 51 and the rear end lower beam 52 are provided with straight slots 30 at both ends, the front end upper beam 41, the front end lower beam 42, the rear end upper beam 51 and the rear end lower beam 52 are connected with the side plates through bolts 40, and the bolts 40 pass through the straight slots 30. When the radial collimator is assembled, the nuts 72 at two ends of the stretching stud 7 are screwed, at the moment, the two side plates are folded towards the middle to compress all the absorption films 2 and the spacing bars 3, and in the process of compressing the side plates, the bolt 40 is automatically adjusted to the correct position in the straight hole groove 30 and then the bolt 40 is fastened. During tightening of the nut 72 and stretching, the stretching stud 7 may twist, which may affect the flatness of the local absorption film 2, and therefore, anti-twist pins are further provided at both ends of the stretching stud 7 to be embedded in the side plates.
In one embodiment, the front L-shaped buckle 411 and the rear L-shaped buckle 511 are provided with a threaded through hole 50, the threaded through hole 50 is communicated with the through groove 20, an auxiliary stretching cover plate 512 is arranged above the rear L-shaped buckle 511, and the auxiliary stretching cover plate 512 is provided with a plurality of through holes corresponding to the threaded through hole 50 on the rear L-shaped buckle 511. The jackscrew 63 is screwed into the threaded through hole of the front end L-shaped buckle 411 or the through hole of the auxiliary tension cover plate 512, so that the connection absorption film 2 and the spacing bar 3 on the corresponding front end L-shaped buckle 411 or the rear end L-shaped buckle 511 can be secondarily tensioned.
The radial collimator for a neutron diffraction spectrometer disclosed in the present application has been described above, and an example thereof will be described below.
In one example, the horizontal coverage angle of the detector of the neutron diffraction spectrometer is 30 degrees, the vertical coverage angle is 40 degrees, the distance between the detector and the central point of the sample is 2m, and the radial collimator is arranged in the space of the 2 m. In order to provide enough sample space, the front end face of the radial collimator is a cylindrical surface with the radius of 600mm, and the maximum length of the radial collimator is 600mm according to the manufacturing process, so that the cylindrical surface with the radius of 1200mm is obtained by calculation, the focus of the cylindrical surface at the front end is strictly superposed with the central point of the sample, and a square horn space profile with a small front end and a large rear end of the radial collimator is formed by matching the horizontal coverage angle and the vertical coverage angle of the detector. When the measured length is 4mm, the angle between the absorption films in the radial collimator is 0.191 degrees through physical and optical path calculation, the deviation is not more than +/-0.005 degrees, the total number of the absorption films is 164, the absorption films are trapezoidal metal foils, the thickness is 0.06mm, and the absorption films are made of strong neutron absorption materials. The length of the spacing bar exceeds 600mm, the thickness of the thin end is 1.94mm, the thickness of the thick end is 3.94mm, and the thickness deviation does not exceed 50 microns. Trapezoidal aluminum alloy plate is selected for use to radial collimater curb plate, and it is 40mm to obtain thickness through finite element analysis calculation optimization, through 10 jackscrew bolts, can separate tensile curb plate and fixed curb plate, two location uide pins provide location and direction, and jackscrew stud below is equipped with the blind hole round pin, and the blind hole round pin material is high strength alloy steel, and scribbles proper amount lubricating oil at jackscrew stud and blind hole round pin contact surface, resistance when reducing the tensile. Be equipped with 18 tensile double-screw bolts of arc on the radial collimator, respectively be equipped with 9 on tensile curb plate and the fixed curb plate lower limb, by front end to rear end, tensile double-screw bolt circular arc radius progressively increases, and the arc length corresponds the angle and is greater than radial collimator horizontal cover angle 30, and is corresponding, and the upper and lower border of absorption film and space bar all is equipped with 9 round holes, all is equipped with 9 counter sink on tensile curb plate and the fixed curb plate, supplies tensile double-screw bolt to pass and mounting nut.
According to the radial collimator for the neutron diffraction spectrometer in the embodiment, the absorption film and the spacing bars are arranged in the square horn-shaped collimator frame, the coverage range of the collimator comprises the coverage range of the detector, the collimator is arranged between the sample center point of the neutron diffraction spectrometer and the detector, and compared with the radial collimator which is not arranged, the background noise of a spectrometer experiment is greatly reduced, and the data precision and the spectrometer resolution are obviously improved. Simultaneously, rely on the installation relation between each part, can realize the drawing of whole or partial absorbing film through tensile curb plate, front end L type buckle and rear end L type buckle for the absorbing film is level and smooth, the clearance is even, and the terminal surface is the arcwall face around the absorbing film, makes the absorbing film locate the same along the tension of pitch arc subsection in tensile process everywhere, avoids appearing the fold at tensile in-process and breaks.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A radial collimator for a neutron diffraction spectrometer, comprising:
the collimator frame is characterized in that the front end face and the rear end face of the collimator frame are both cylindrical surfaces, the axes of the front end face and the rear end face of the collimator frame are overlapped, the area of the front end face of the collimator frame is smaller than that of the rear end face of the collimator frame, and the collimator frame is in a square horn shape;
the absorption film is a trapezoidal thin film, and the material of the absorption film is a strong neutron absorption material;
the spacing bar is a long strip-shaped thin plate with variable thickness;
a plurality of absorption films and a plurality of spacing strips are alternately stacked in the collimator frame;
the horizontal coverage angle of the absorption film is larger than or equal to that of the neutron diffraction spectrometer detector, and the vertical coverage angle of the absorption film is larger than or equal to that of the neutron diffraction spectrometer detector.
2. The radial collimator of the neutron diffraction spectrometer of claim 1, wherein the collimator frame comprises a front upper beam, a front lower beam, a rear upper beam, a rear lower beam and two side plates symmetrically arranged, the front upper beam, the front lower beam, the rear upper beam and the rear lower beam are circular-arc-shaped, the side plates are trapezoidal plates, two ends of the front upper beam, the front lower beam, the rear upper beam and the rear lower beam are respectively connected with the side plates on two sides, and four corners of the absorption film and the spacing bars are respectively connected with the front upper beam, the front lower beam, the rear upper beam and the rear lower beam.
3. The radial collimator of a neutron diffraction spectrometer of claim 2, wherein the absorption film and the spacing bar are provided with L-shaped clamping grooves at four corners; a through groove is formed in the front-end upper beam, a plurality of front-end L-shaped buckles are arranged in the through groove of the front-end upper beam, and the front-end L-shaped buckles are buckled with the corresponding groups of L-shaped clamping grooves of the absorption films and the spacing strips; a through groove is formed in the rear end upper beam, a plurality of rear end L-shaped buckles are arranged in the through groove of the rear end upper beam, and the rear end L-shaped buckles are buckled with the corresponding groups of L-shaped clamping grooves of the absorption films and the spacing strips; the front end underbeam and the rear end underbeam are provided with L-shaped buckles, and the L-shaped buckles are buckled with the L-shaped clamping grooves of the absorption film and the spacing strips.
4. The radial collimator of a neutron diffraction spectrometer of claim 3, wherein the side plates comprise a fixed side plate and a stretching side plate, the stretching side plate is disposed above the fixed side plate, the stretching side plate can move in a vertical direction relative to the fixed side plate, the stretching side plate is connected with the front end upper beam and the rear end upper beam, and the fixed side plate is connected with the front end lower beam and the rear end lower beam.
5. The radial collimator of a neutron diffraction spectrometer of claim 4, wherein a plurality of vertically oriented jackscrew bolts are arranged between the stretching side plate and the fixing side plate and penetrate through the stretching side plate.
6. The radial collimator of a neutron diffraction spectrometer of claim 5, wherein the fixed side plate is provided with a plurality of blind holes, and the blind holes are opposite to the jackscrew bolts.
7. The radial collimator of a neutron diffraction spectrometer of claim 6 wherein a positioning guide pin is disposed between the tension side plate and the fixed side plate.
8. The radial collimator of a neutron diffraction spectrometer of claim 7, further comprising: tensile double-screw bolt, tensile double-screw bolt is arc double-screw bolt, and is a plurality of tensile double-screw bolt runs through all the absorbing film with space stop and both sides the curb plate, be equipped with the counter sink on the curb plate, be equipped with the nut in the counter sink, the nut with tensile double-screw bolt is connected, tensile curb plate with all worn on the fixed curb plate tensile double-screw bolt.
9. The radial collimator of a neutron diffraction spectrometer of claim 8, wherein the front upper beam, the front lower beam, the rear upper beam and the rear lower beam are provided with straight-hole grooves at both ends, the front upper beam, the front lower beam, the rear upper beam and the rear lower beam are connected with the side plates through bolts, and the bolts penetrate through the straight-hole grooves.
10. The radial collimator of a neutron diffraction spectrometer of claim 9, wherein the front L-shaped buckle and the rear L-shaped buckle are provided with threaded through holes, the threaded through holes are communicated with the through grooves, an auxiliary stretching cover plate is arranged above the rear L-shaped buckle, and the auxiliary stretching cover plate is provided with a plurality of through holes corresponding to the threaded through holes in the rear L-shaped buckle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210247433.1A CN114649105A (en) | 2022-03-14 | 2022-03-14 | Radial collimator for neutron diffraction spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210247433.1A CN114649105A (en) | 2022-03-14 | 2022-03-14 | Radial collimator for neutron diffraction spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116384203B (en) * | 2023-05-26 | 2023-08-04 | 四川中物积庆医疗科技有限公司 | Method and system for shape and size adjustment of BNCT neutron collimator |
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2022
- 2022-03-14 CN CN202210247433.1A patent/CN114649105A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116384203B (en) * | 2023-05-26 | 2023-08-04 | 四川中物积庆医疗科技有限公司 | Method and system for shape and size adjustment of BNCT neutron collimator |
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