CN112415741B - Glass-made coded aperture collimator and preparation method thereof - Google Patents

Glass-made coded aperture collimator and preparation method thereof Download PDF

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Publication number
CN112415741B
CN112415741B CN202011195841.4A CN202011195841A CN112415741B CN 112415741 B CN112415741 B CN 112415741B CN 202011195841 A CN202011195841 A CN 202011195841A CN 112415741 B CN112415741 B CN 112415741B
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glass
aperture collimator
coded aperture
square
screen
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CN112415741A (en
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徐昭
顾燕
廖亦戴
李臻
吴超
姜博文
黎龙辉
张振
金戈
周新
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North Night Vision Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/10—Non-chemical treatment
    • C03B37/14—Re-forming fibres or filaments, i.e. changing their shape
    • C03B37/15—Re-forming fibres or filaments, i.e. changing their shape with heat application, e.g. for making optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C03C13/04—Fibre optics, e.g. core and clad fibre compositions
    • C03C13/045—Silica-containing oxide glass compositions
    • C03C13/046—Multicomponent glass compositions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/66—Chemical treatment, e.g. leaching, acid or alkali treatment
    • C03C25/68—Chemical treatment, e.g. leaching, acid or alkali treatment by etching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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Abstract

The invention provides a glass-made coded aperture collimator and a preparation method thereof. The invention abandons the traditional metal collimator material structure and the preparation method thereof, adopts completely different processing principles, and the glass-based coded aperture collimator has the spatial resolution reaching the micron level, is two orders of magnitude higher than that of the metal collimator, and is suitable for scientific and engineering application with high requirement on the spatial resolution of a lens; meanwhile, the single-piece glass coded aperture collimator is extremely light in weight, so that the optical lens has great advantage in load weight after the coded aperture collimator is subjected to array splicing.

Description

Glass-made coded aperture collimator and preparation method thereof
Technical Field
The invention relates to the technical field of coded aperture collimators, in particular to a coded aperture collimator made of glass and a preparation method thereof.
Background
The coded aperture collimator is an optical device applied to the field of ray detection with certain spatial resolution, and is applied to deep space detection, nuclear radiation imaging, nuclear radiation monitoring, medical imaging and other aspects. With the further improvement of the precision requirements of the detection and imaging on the system, the improvement of the spatial resolution of the coded aperture collimator becomes the key for improving the ray detection and the ray imaging.
The traditional metal coded aperture collimator is limited by a processing technology, the spatial resolution is generally millimeter-scale and difficult to reach micrometer-scale, and the detection application requirement of high spatial resolution cannot be met
Disclosure of Invention
The invention aims to provide a glass-made coded aperture collimator and a preparation method thereof, which can achieve micron-sized spatial resolution, have extremely light weight and are beneficial to lens assembly and practical application.
According to a first aspect of the present invention, a method for manufacturing a coded aperture collimator made of glass is provided, which comprises:
step 1, selecting a cladding material and a core material which are matched with each other and made of glass materials, and firstly drawing a solid cladding material glass rod into a cladding material wire at a high temperature; secondly, sleeving a solid core material glass rod in a leather material pipe with a hollow tubular section, tightly matching, and drawing at high temperature to prepare glass fibers;
step 2, the cladding wires and the glass wires are arranged into the screen section one by one according to a preset arrangement mode, and the size difference of two opposite sides of the arranged screen section is ensured to be within 0.05 mm; wherein the leather filament is a non-corrodible position, and the glass filament is arranged at a corrodible position;
step 3, putting the arranged screen sections into a vacuum screen pressing system, and pressing at a preset temperature and in a vacuum environment to enable all square glass fibers and square sheath fibers in the screen sections to be fused and pressed together;
step 4, hanging and fixing the fused screen section, slowly placing the screen section into an effective temperature area of a wire drawing furnace, and preserving the heat of the screen section at high temperature for 1-2 hours and reducing the diameter to form a coding array;
and 5, slicing and polishing the screen sections forming the coding array, corroding and removing the core material part in the screen sections by adopting a chemical corrosion mode, and reserving the leather part to obtain the final coding aperture collimator structure.
Preferably, the coded aperture collimator is lead-containing glass with a lead content of 10% to 50%.
Preferably, in step 1, the leather comprises the following components in percentage by mass:
SiO2：38％-65％
PbO+Bi2O3：18％-50％
BaO+Al2O3：7％-11％
Na2O+K2O：4％-6％
the core material comprises the following components in percentage by mass:
SiO2+B2O3：33％-45％
RO+BaO：31％-39％
LaO+PbO：12％-28％
K2O+Al2O3+Na2O：6％-9％。
preferably, in step 1, the drawing of the sheath fiber and the glass fiber is performed at a high temperature of 600-700 ℃, and the cross-sectional shapes and sizes of the sheath fiber and the glass fiber obtained by drawing are the same.
Preferably, in step 2, in the arranging process, the screen segments are arranged according to a preset Uniform Redundant Array (URA), a Modified Uniform Redundant Array (MURA), or a self-supporting array (NTHT), and the arranged screen segments are square, circular, or regular hexagon.
Preferably, in the step 4 of the maintaining, the maintaining temperature is 5-10 ℃ lower than the temperature at which the glass fiber is drawn in the step 1.
Preferably, the preset temperature range is 500-600 ℃ during the melting and pressing process of step 3.
Preferably, the preparation method further comprises: the inner wall of the hole formed in the coding aperture collimator by corrosion is plated with a functional film layer to enhance the reflection or absorption function.
Preferably, the preparation method further comprises: and plating a metal shading film on the incident surface of the coded aperture collimator, wherein the metal shading film is an aluminum metal film or a magnesium metal film.
According to a second aspect of the present invention, there is further provided a glass material coded aperture collimator prepared by the foregoing method, wherein the solid cladding glass rod has a square, circular, or regular hexagonal cross section, and the hollow tube of the hollow tubular cladding tube has a square, circular, or regular hexagonal cross section.
Preferably, the open area ratio of the coded aperture collimator is controlled to be 10% to 70%.
By the technical scheme of the invention, the remarkable advantages are as follows:
1) the glass-based coded aperture collimator provided by the invention abandons the traditional metal collimator material structure and the preparation method thereof, adopts completely different processing principles, is limited by the processing precision, and has spatial resolution only reaching millimeter level, can reach micron level, and has spatial resolution which is two orders of magnitude higher than that of the metal material, and is suitable for scientific and engineering application with high requirement on the spatial resolution of a lens;
2) the single piece of the glass coded aperture collimator is only several grams in weight and is lighter by one order of magnitude compared with a metal material, so that the optical lens has advantages in load weight after the coded aperture collimator is subjected to array splicing; in addition, the overall dimension of the glass-made coded aperture collimator can be made to be in the millimeter level as the minimum dimension, can be spliced to any required dimension, and is suitable for the engineering realization of large-size detection;
3) on the basis of ensuring the structural strength, the smaller the ratio of the thickness of the collimator to the aperture is, the better the coding aperture of the glass material is, the transmittance of rays can be improved, and the signal-to-noise ratio of a detection system can be improved.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments according to the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the imaging principle of an exemplary glass coded aperture collimator of the present invention.
Fig. 2 is a flow chart of an exemplary process for making a coded aperture collimator of the glass material of the present invention.
FIG. 3 is a schematic diagram of an exemplary glass coded aperture collimator of the present invention.
FIG. 4 is a schematic representation of an X-ray test image of an exemplary glass coded aperture collimator of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Referring to fig. 1-3, a glass-based coded aperture collimator according to an exemplary embodiment of the present invention is designed to abandon the material structure and the manufacturing method of the conventional metal collimator, and adopt completely different processing principles, because the conventional metal collimator is limited by the processing precision, the spatial resolution of the conventional metal collimator can only reach the millimeter level, while the glass-based coded aperture collimator of the present invention can reach the micrometer level, and the spatial resolution is two orders of magnitude higher than that of the metal collimator, and is suitable for scientific and engineering applications with high requirements on the spatial resolution of the lens; meanwhile, the single-piece glass coded aperture collimator is extremely light in weight, so that the optical lens has great advantage in load weight after the coded aperture collimator is subjected to array splicing.
With reference to the process shown in fig. 2, the preparation of the glass-made coded aperture collimator, which is implemented as an example, includes matching and selecting a core material and a cladding glass rod, drawing a filament from the glass rod, and performing a plurality of processes including screen arrangement, screen pressing, diameter changing, cold processing, and chemical etching on the filament to finally prepare the lead-containing glass-made coded aperture collimator, so that the collimating and high position resolution effects are realized.
In an alternative embodiment, a through functional film layer can be plated on the inner wall of the hole of the coding aperture collimator to enhance the reflection or absorption function.
In an optional embodiment, a light shielding film may be further plated on the incident surface of the code aperture collimator according to an actual application environment, and the material may be metal such as aluminum, magnesium, and the like.
The following will describe more specifically the preparation of the lead-containing glass coded aperture collimator of the present invention with reference to specific examples, which comprises the following steps:
step 1, selecting a cladding material and a core material which are matched with each other and made of glass materials, and firstly drawing a solid cladding material glass rod into a cladding material wire at a high temperature; secondly, sleeving a solid core material glass rod in a leather material pipe with a hollow tubular section, tightly matching, and drawing at high temperature to form glass fibers;
step 2, the cladding wires and the glass wires are arranged into the screen section one by one according to a preset arrangement mode, and the size difference of two opposite sides of the arranged screen section is ensured to be within 0.05 mm; wherein the square leather filament is a non-corrodible position, and the square glass filament is arranged at a corrodible position;
step 3, putting the arranged screen sections into a vacuum screen pressing system, and pressing at a preset temperature and in a vacuum environment to enable all square glass fibers and square sheath fibers in the screen sections to be fused and pressed together;
step 4, hanging and fixing the fused screen section, slowly placing the screen section into an effective temperature area of a wire drawing furnace, and preserving the heat of the screen section at high temperature for 1-2 hours and reducing the diameter to form a coding array;
and 5, slicing and polishing the screen sections forming the coding array, corroding and removing the core material part in the screen sections by adopting a chemical corrosion mode, and reserving the leather part to obtain the final coding aperture collimator structure.
Preferably, the resulting coded aperture collimator of the entire manufacturing process is a lead-containing glass with a lead content of 10% to 50%, wherein the core material is etched away in a final etching operation to form the holes. The aperture can be controlled between 1 μm and 2000 μm, and the corresponding spatial resolution is distributed between micrometer level and millimeter level correspondingly.
In the step 1, the section of the selected solid cladding glass rod can be square, circular, regular hexahedral or other shapes, and the section of the hollow tube-shaped cladding tube is correspondingly set to be square, circular, regular hexahedral or other shapes.
Preferably, in the step 1, the leather comprises the following components in percentage by mass:
SiO2：38％-65％
PbO+Bi2O3：18％-50％
BaO+Al2O3：7％-11％
Na2O+K2O：4％-6％
the core material comprises the following components in percentage by mass:
SiO2+B2O3：33％-45％
RO+BaO：31％-39％
LaO+PbO：12％-28％
K2O+Al2O3+Na2O：6％-9％。
preferably, in step 1, the drawing of the sheath fiber and the glass fiber is performed at a high temperature of 600-700 ℃, and the cross-sectional shapes and sizes of the sheath fiber and the glass fiber obtained by drawing are the same.
Preferably, in step 2, in the arranging process, the screen segments are arranged according to a preset Uniform Redundant Array (URA), a Modified Uniform Redundant Array (MURA), or a self-supporting array (NTHT), and the arranged screen segments are square, circular, or regular hexagon.
Preferably, the preset temperature range is 500-600 ℃ during the melting and pressing process of step 3.
Preferably, in the step 4 of maintaining, the temperature of maintaining is 5-10 ℃ lower than the temperature of drawing the glass filaments in the step 1. .
Preferably, the preparation method further comprises: the inner wall of the hole formed in the coding aperture collimator by corrosion is plated with a functional film layer to enhance the reflection or absorption function.
Preferably, the preparation method further comprises: and plating a metal shading film on the incident surface of the coded aperture collimator, wherein the metal shading film is an aluminum metal film or a magnesium metal film.
Preferably, the open area ratio of the coded aperture collimator is controlled to be 10% to 70% during the manufacturing process.
In examples 1-3 below, the openings of the coded aperture collimator are illustrated as squares.
Leather glass formula (quality percentage)
Composition (I) SiO2 PbO+Bi2O3 BaO+Al2O3 Na2O+K2O
Cladding 1 65 18 11 6
Cladding 2 54 34 7 5
Cladding 3 38 50 8 4
Core material glass formula (quality percentage)
Figure BDA0002753982460000051
Figure BDA0002753982460000061
Example 1
Firstly, two matched glass material cladding materials 1 and core materials 1 are selected according to the physical characteristics and the chemical characteristics of the glass materials, the structural strength is considered, the section of a core material glass rod (which can be corroded) is square, and the cladding material glass rod (which cannot be corroded) comprises two structures, namely a square section structure and a square tubular section structure.
The side length of the square leather glass rod is 30mm, and the square leather glass rod is independently drawn into a square leather wire with the thickness of 0.7mm at the high temperature of 700 ℃.
The square core material glass rod with the side length of 25mm is sleeved in a square leather material tube with the thickness of 2.5mm, the square core material glass rod and the square leather material tube are tightly matched, and the square core material glass rod and the square leather material tube are drawn at the high temperature of 710 ℃ to form a square glass wire with the side length of 0.7 mm.
Further, according to the arrangement mode of the preset coding aperture collimator, such as 61 × 61MURA, the square leather filaments and the square glass filaments are arranged into the screen section row by row, and the size difference between two opposite sides of the arranged screen section is ensured to be within 0.05 mm. And (3) putting the arranged screen sections into vacuum screen pressing equipment, designing a pressurizing process with the maximum temperature of 600 ℃ and the vacuum degree of less than 20Pa according to the physical characteristics of the materials, and melting and pressing all the square wires in the screen sections together. The square leather filament is a non-corrodible position, and the square glass filament is arranged at a corrodible position.
Further, the fused screen section is suspended and fixed, and is slowly placed in an effective temperature zone of a wire drawing furnace, the screen section is subjected to heat preservation at the high temperature of 700 ℃ for 2 hours, and the diameter of the screen section is reduced by 9 times, so that a coding array with the minimum unit of 77 mu m is formed.
And further, slicing and polishing the screen section forming the coding array, corroding and removing the core material part in the screen section by adopting a chemical corrosion mode, and reserving the leather material part to obtain the final coding aperture collimator structure.
Example 2
Firstly, two matched glass materials of a cladding material 2 and a core material 2 are selected according to the physical characteristics and the chemical characteristics of the glass materials, the structural strength is considered, the section of a core material glass rod (which can be corroded) is square, and the cladding material glass rod (which cannot be corroded) comprises two structures of square section and square tubular section.
The side length of the square leather glass rod is 30mm, and the square leather glass rod is independently drawn into a square leather wire with the thickness of 0.8mm at the high temperature of 640 ℃.
The side length of the square core material glass rod is 25mm, the square core material glass rod is sleeved in a square leather material pipe with the thickness of 2.5mm, the square leather material pipe is tightly matched with the square core material glass rod, and the square core material glass rod is drawn into a square glass wire with the thickness of 0.8mm at the high temperature of 650 ℃.
Furthermore, according to a preset arrangement mode, the square glass fibers and the square leather fibers are arranged into the screen section row by row, and the size difference of two opposite sides of the arranged screen section is within 0.05 mm.
And (3) putting the arranged screen sections into vacuum screen pressing equipment, designing a pressurizing process with the maximum temperature of 550 ℃ and the vacuum degree of less than 20Pa according to the physical characteristics of the materials, and melting and pressing all the square wires in the screen sections together.
Further, the fused screen section is suspended and fixed, and is slowly placed into an effective temperature zone of a wire drawing furnace, the screen section is subjected to heat preservation for 1.5 hours at the high temperature of 640 ℃, and the diameter of the screen section is reduced by 8 times, so that a coding array with the minimum unit of 100 mu m is formed.
And further, slicing and polishing the screen section forming the coding array, corroding and removing the core material part in the screen section by adopting a chemical corrosion mode, and reserving the leather material part to obtain the final coding aperture collimator structure.
Example 3
Firstly, two matched glass material cladding 3 and core 3 materials are selected according to the physical and chemical characteristics of the glass material, the structural strength is considered, the section of the core glass rod (which can be corroded) is square, and the cladding glass rod (which cannot be corroded) comprises two structures, namely a square section and a square tubular section.
The side length of the square leather glass rod is 30mm, and the square leather glass rod is independently drawn into a square leather wire with the thickness of 0.5mm at the high temperature of 600 ℃.
The side length of the square core material glass rod is 25mm, the square core material glass rod is sleeved in a square leather material pipe with the thickness of 2.5mm, the square core material glass rod and the square leather material pipe are tightly matched, and the square core material glass rod is drawn into a square glass wire with the thickness of 0.5mm at the high temperature of 610 ℃.
Furthermore, according to a preset arrangement mode, the square glass fibers and the square leather fibers are arranged into the screen section row by row, and the size difference of two opposite sides of the arranged screen section is within 0.05 mm.
And (3) putting the arranged screen sections into vacuum screen pressing equipment, designing a pressurizing process with the maximum temperature of 510 ℃ and the vacuum degree of less than 20Pa according to the physical characteristics of the materials, and melting and pressing all the square wires in the screen sections together.
Further, the screen section which is well fused and pressed is suspended and fixed, and is slowly placed into an effective temperature area of a wire drawing furnace, the screen section is subjected to heat preservation for 1 hour at the high temperature of 600 ℃, and the diameter of the screen section is reduced by 8 times, so that a coding array with the minimum unit of 62.5 mu m is formed.
And further, slicing and polishing the screen section forming the coding array, corroding and removing the core material part in the screen section by adopting a chemical corrosion mode, and reserving the leather material part to obtain the final coding aperture collimator structure.
Referring to fig. 3, an example of a coded aperture collimator made of glass is shown in accordance with example 1 of the present invention, wherein the transparent portion is a cladding glass and the off-white portion is a hole formed by etching the core. It was tested and showed:
1. the specific size of the glass code aperture collimator is 7.5mm multiplied by 7.5mm, the minimum unit is 80 mu m multiplied by 80 mu m, and the inner part is 61 multiplied by 61MURA arrangement;
2. with reference to fig. 4, the test images show that the X-ray performance is good, the whole panel presents a clear coding pattern, the spatial resolution is 80 μm, and the spatial resolution is improved by two orders of magnitude compared with the mm level of the metal material.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (10)

1. A preparation method of a glass-made coded aperture collimator is characterized by comprising the following steps:
step 1, selecting a cladding material and a core material which are matched with each other and made of glass materials, and firstly drawing a solid cladding material glass rod into a cladding material wire at a high temperature; secondly, sleeving a solid core material glass rod in a leather material pipe with a hollow tubular section, tightly matching, and drawing at high temperature to prepare glass fibers;
step 2, the cladding wires and the glass wires are arranged into the screen section one by one according to a preset arrangement mode, and the size difference of two opposite sides of the arranged screen section is ensured to be within 0.05 mm; wherein the leather filament is a non-corrodible position, and the glass filament is arranged at a corrodible position;
step 3, putting the arranged screen sections into a vacuum screen pressing system, and pressing at a preset temperature and in a vacuum environment to enable all square glass fibers and square leather fibers in the screen sections to be fused and pressed together;
step 4, hanging and fixing the fused screen section, slowly placing the screen section into an effective temperature area of a wire drawing furnace, and preserving the heat of the screen section at high temperature for 1-2 hours and reducing the diameter to form a coding array;
step 5, slicing and polishing the screen sections forming the coding array, corroding and removing the core material part in the screen sections by adopting a chemical corrosion mode, and reserving the leather material part to obtain the final coding aperture collimator structure;
the leather comprises the following components in percentage by mass:
SiO2：38%-65%
PbO+Bi2O3：18%-50%
BaO+Al2O3：7%-11%
Na2O+K2O：4%-6%
the core material comprises the following components in percentage by mass:
SiO2+B2O3：33%-45%
RO+BaO：31%-39%
LaO+PbO：12%-28%
K2O+Al2O3+Na2O：6%-9%。
2. the method of claim 1, wherein the coded aperture collimator is a lead-containing glass with a lead content of 10% to 50%.
3. The method as claimed in claim 1, wherein the step 1 is performed at a temperature of 600-700 ℃, and the cross-sectional shapes and sizes of the drawn glass fiber and the drawn cladding fiber are the same.
4. The method of claim 1, wherein in the step 2, the screen segments are arranged in a square, circular or regular hexagon according to a predetermined Uniform Redundant Array (URA), a Modified Uniform Redundant Array (MURA) or a self-supporting array (NTHT).
5. The method of claim 1, wherein the holding temperature in the step 4 is 5-10 ℃ lower than the temperature at which the glass filaments are drawn in the step 1.
6. The method as claimed in claim 1, wherein the predetermined temperature range is 500-600 ℃ during the step 3 of fusing.
7. The method of manufacturing a coded aperture collimator of glass material according to claim 1, further comprising:
the inner wall of the hole formed in the coding aperture collimator by corrosion is plated with a functional film layer to enhance the reflection or absorption function.
8. The method of manufacturing a coded aperture collimator of glass material according to claim 1, further comprising:
and plating a metal shading film on the incident surface of the coded aperture collimator.
9. A glass coded aperture collimator prepared according to any one of claims 1 to 8, wherein the cross section of the solid cladding glass rod is square, circular or regular hexagonal, and the cross section of the hollow tube cladding tube is correspondingly square, circular or regular hexagonal.
10. The glass coded aperture collimator as claimed in claim 9, wherein the open area ratio of the coded aperture collimator is controlled to be 10% to 70%.
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CN108922646A (en) * 2018-07-02 2018-11-30 中国建筑材料科学研究总院有限公司 collimator and preparation method
CN109893155A (en) * 2019-03-05 2019-06-18 中国辐射防护研究院 A kind of notch method for manufacturing collimator for gamma camera
CN111063471A (en) * 2019-12-13 2020-04-24 北方夜视技术股份有限公司 Angel type lobster eye X-ray focusing optical device and preparation and detection method thereof

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CN108922646A (en) * 2018-07-02 2018-11-30 中国建筑材料科学研究总院有限公司 collimator and preparation method
CN109893155A (en) * 2019-03-05 2019-06-18 中国辐射防护研究院 A kind of notch method for manufacturing collimator for gamma camera
CN111063471A (en) * 2019-12-13 2020-04-24 北方夜视技术股份有限公司 Angel type lobster eye X-ray focusing optical device and preparation and detection method thereof

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