Capillary array and its preparation method and application

Abstract

The present invention provides a capillary array and its preparation method and application. The capillary array includes: a capillary bundle, which is composed of a plurality of glass capillaries with parallel axes; a light-absorbing layer of glass is provided between any two of the capillaries; the softening point of the glass body of the glass capillary is T1, and the softening point of the light-absorbing layer of glass is T2, wherein the difference between T1-T2 is 60-150°C; a metal wire, which is embedded between at least three adjacent capillaries; the space between the at least three adjacent capillaries is filled with the light-absorbing layer of glass; the light-absorbing layer of glass is coated on the outside of the metal wire to fix it. The technical problem to be solved by the present invention is how to prepare a capillary array so that the liquid scintillator optical fiber panel made of the capillary array has the ability to resist recoil proton crosstalk, resist light crosstalk, have high spatial resolution, and a simple preparation process, thereby being more suitable for practical use.

Description

Technical Field

[0001] The present invention relates to the technical field of fast neutron detection, and in particular to a capillary array and a preparation method and application thereof. Background Art

[0002] The liquid scintillator fiber optic panel is a fast neutron detection device that is a capillary array filled with liquid scintillator. Its detection principle is: fast neutrons collide with hydrogen nuclei in the liquid scintillator, causing elastic scattering and generating recoil protons. The recoil protons excite the liquid scintillator to emit visible fluorescence. Part of the visible fluorescence is totally reflected by the inner wall of the capillary, transmitted from the output end of the liquid scintillator fiber optic panel, and received by photosensitive elements such as CCD or CMOS, thereby realizing the detection of fast neutrons.

[0003] The preparation method of the liquid scintillator optical fiber panel in the prior art is as follows: a low-refractive-index glass tube is drawn into a capillary monofilament; the capillary monofilament is then arranged into a multifilament rod; the multifilament rod is then drawn into a capillary multifilament; at this point, each multifilament contains multiple capillary fibers; then, the multifilament is cut into capillary fiber bundles, which are then heated and fused to form billets; finally, the two ends of the billet are cut into flat surfaces, the capillaries are filled with liquid scintillator, and the two ends are then covered with lenses or optical fiber panels for packaging.

[0004] However, there is a major problem in the use of existing liquid scintillator fiber optic panels: when fast neutrons are elastically scattered in the liquid scintillator, the recoil protons generated have very high energy. The recoil protons will penetrate multiple capillaries at once in a direction oblique to the direction of incidence of the fast neutrons, and stimulate fluorescence in multiple capillaries, so that the fluorescence range greatly exceeds the incident range of the fast neutrons, resulting in a reduction in the spatial resolution ability of the detection system for fast neutrons. Summary of the Invention

[0005] The main purpose of the present invention is to provide a capillary array and its preparation method and application. The technical problem to be solved is how to prepare a capillary array so that the liquid scintillator fiber panel made of the capillary array has the ability to resist recoil proton crosstalk, resist light crosstalk, have high spatial resolution, and simple preparation process, thus being more suitable for practical use.

[0006] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. A capillary array proposed in the present invention comprises:

[0007] A capillary bundle is composed of multiple glass capillaries with parallel axes; a light absorbing layer of glass is provided between any two of the capillaries; the softening point of the glass body of the glass capillary is T1, and the softening point of the glass of the light absorbing layer is T2, wherein the difference between T1 and T2 is 60 to 150°C;

[0008] The metal wire is embedded between at least three adjacent capillaries; the light absorbing layer glass is filled between the at least three adjacent capillaries; and the light absorbing layer glass is coated on the outside of the metal wire to fix it.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] Preferably, in the aforementioned capillary array, the inner diameter of the capillary is 100-1000 μm.

[0011] Preferably, in the aforementioned capillary array, the inner diameter of the capillary is 100-500 μm.

[0012] Preferably, in the aforementioned capillary array, the light absorbing layer is composed of light absorbing glass; or, the light absorbing layer is composed of light absorbing glass and low softening point glass.

[0013] Preferably, in the aforementioned capillary array, the material of the metal wire is selected from at least one of platinum, gold and tungsten; and the wire diameter d of the metal wire is ≥30 μm.

[0014] Preferably, the capillary array is a square array; the metal wire is embedded in the four corner pores surrounded by four adjacent capillaries; the wire diameter d of the metal wire and the axial center distance D between two adjacent capillaries satisfy the following relationship:

[0015]

[0016] Preferably, in the aforementioned capillary array, the difference between T1 and T2 is 60-100°C.

[0017] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. According to the present invention, a method for preparing a capillary array comprises the following steps:

[0018] S1: drawing a glass preform tube to obtain a capillary tube; each of the glass preform tubes is composed of a tube body glass and a light absorbing layer glass adjacent to each other; the softening point of the tube body glass is T1, and the softening point of the light absorbing layer glass is T2, wherein the difference between T1 and T2 is 60 to 150°C;

[0019] S2: arranging the capillaries adjacent to each other into a layer; the capillary axes are parallel; and recessed areas are formed between adjacent capillaries;

[0020] S3 places a metal wire of a preset size in each recessed area to form a capillary layer for placing the metal wire;

[0021] S4 alternately performs step S2 and step S3 N-1 times and N-2 times on the capillary layer on which the metal wire is placed, and bundles the billet to obtain a billet containing N capillary layers; N is a natural number greater than or equal to 3;

[0022] S5: Melting and pressing the billet, cutting the two end faces flat, and obtaining a capillary array; the temperature T of the melting and pressing is: T2<T<T1.

[0023] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0024] Preferably, in the aforementioned method for preparing the capillary array, the method for preparing the glass prefabricated tube is as follows:

[0025] S11, processing the tube body glass into a glass tube; the cross section of the glass tube is a ring-shaped cross section with circular inner and outer contours; processing the light absorbing layer glass into a glass rod with a circular cross section; and drawing the glass rod into a glass monofilament;

[0026] S12. Arrange the glass monofilaments in a fully encapsulated manner on the periphery of the glass tube to form a glass preform tube; the glass monofilaments are light-absorbing glass monofilaments; or, the glass monofilaments are light-absorbing glass monofilaments and low-softening-point glass monofilaments.

[0027] The purpose of the present invention and the solution to its technical problems are also achieved by adopting the following technical solutions. According to the present invention, a liquid scintillator fiber optic panel is proposed, which includes:

[0028] The aforementioned capillary array;

[0029] Liquid scintillator, filled in each capillary of the capillary array;

[0030] The end-sealing components cover both ends of the capillary array filled with the liquid scintillator.

[0031] By means of the above technical solution, the capillary array and its preparation method and application proposed in the present invention have at least the following advantages:

[0032] The present invention proposes a capillary array, a preparation method, and an application thereof. By arranging metal wires in the gaps enclosed by at least three adjacent capillaries and utilizing the radiation shielding effect of the metal material, when applied to a liquid scintillator fiber panel, the array can effectively prevent crosstalk of recoil protons between different capillaries. Furthermore, by preferably selecting a metal with a high atomic number as the material of the metal wire, the prepared liquid scintillator fiber panel can effectively prevent crosstalk of high-energy recoil protons, thereby improving the spatial resolution of the liquid scintillator fiber panel.

[0033] The present invention proposes a capillary array, a preparation method, and an application thereof. By limiting the provision of a light-absorbing layer of glass between any two glass capillaries, that is, the light-absorbing layer of glass is coated on the outside of the glass capillary body, the capillary array can effectively block the crosstalk light between the capillaries in the liquid scintillator fiber optic panel, avoid or reduce the light crosstalk between two adjacent capillaries, and thus improve the spatial resolution of the liquid scintillator fiber optic panel.

[0034] The present invention proposes a capillary array, a preparation method, and an application thereof. By coating the capillary tubes with a light-absorbing glass layer and strictly controlling the softening point of the tube body glass to be 60 to 150°C higher than that of the light-absorbing layer glass, this structural design effectively controls the state of the capillary tube bundle during high-temperature, pressurized fusion. By controlling the melt-pressing temperature of the billet to be between the softening points of the light-absorbing layer glass and the tube body glass, the tube body glass, having a melting point higher than the melt-pressing temperature, does not soften or deform during the melt-pressing process, thereby ensuring that the capillaries do not deform. Furthermore, since the light-absorbing layer glass has a melting point lower than the melt-pressing temperature, it softens and flows during the melt-pressing process, filling the gaps between the capillaries and tightly covering the metal wires between the capillaries, thereby stably fixing the metal wires within the capillary tube bundle. The preparation process is simple.

[0035] The present invention uses the above technical solution to better control the penetration length of recoil protons and improve the spatial resolution of fast neutrons as much as possible.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the structure of a tetragonally arranged capillary array;

[0038] Figure 2 This is a schematic diagram of the structure of a tetragonally arranged capillary bundle before melting and pressing;

[0039] Figure 3 It is a structural diagram of a glass prefabricated tube. DETAILED DESCRIPTION

[0040] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of a capillary array, its preparation method, and its specific implementation, structure, features, and effectiveness, as proposed by the present invention. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0041] The present invention proposes a capillary array, as shown in the attached Figure 1 To the attached Figure 3 As shown, it includes a capillary bundle; the capillary bundle includes multiple capillaries; the multiple capillaries are arranged into a bundle in a manner that the axes are parallel to each other; the outer side of the tube glass 1 of each capillary tube is coated with a light absorption layer glass 2; the tube glass is used as the main material of the capillary tube body to maintain the shape of the capillary tube, and the light absorption layer glass is filled between any two adjacent capillary tube bodies; the light absorption layer glass is used to fuse the multiple capillaries into a whole on the one hand, and on the other hand, it is filled between the two capillary tube bodies to avoid or slow down the crosstalk of light in different capillaries, thereby improving the spatial resolution of the liquid scintillator fiber optic panel.

[0042] The capillary array further includes a metal wire 3 embedded in the space enclosed by at least three adjacent capillaries; the space between at least three adjacent capillaries is filled with the light-absorbing layer of glass; the light-absorbing layer of glass wraps around the outer surface of the metal wire to secure it. The technical solution of the present invention, by placing a metal wire in the gap enclosed by adjacent capillaries and utilizing the radiation shielding effect of the metal material, effectively controls the penetration length of recoil protons when the capillary array provided with the metal wire is applied to a liquid scintillator fiber panel, effectively preventing crosstalk between recoil protons and maximizing the spatial resolution of fast neutrons.

[0043] Furthermore, the present invention preferably uses a metal with a high atomic number as the material of the metal wire, preferably at least one of platinum, gold and tungsten; and controls the wire diameter of the metal wire to be d≥30μm. The energy of the recoil protons will be absorbed or reduced after hitting the metal wire, thereby effectively reducing the crosstalk distance of the recoil protons. The liquid scintillator fiber optic panel prepared by the invention can effectively prevent the crosstalk of the recoil protons.

[0044] In a specific embodiment of the present invention, the capillary array is a quadrilateral array, as shown in the attached Figure 1 and attached Figure 2As shown, the quadrilateral arrangement described in the present invention means that the specifications of each capillary tube in each capillary layer are the same, the axis positions are aligned vertically, the capillaries in the upper and lower layers are not misaligned with each other, and the capillary arrangement is very regular; this arrangement structure allows four capillaries adjacent to each other in the upper, lower, left and right directions to form a four-corner pore with four-sided arcs, and the metal wire is embedded in the four-corner pore surrounded by the four adjacent capillaries; the light-absorbing layer glass between the capillaries bonds the capillaries together as a whole and tightly covers the metal wire, fixing the metal wire in the pore.

[0045] Preferably, the wire diameter d of the metal wire and the axial center distance D between two adjacent capillaries satisfy the following relationship:

[0046]

[0047] The technical purpose of this sizing is to ensure that the diameter of the embedded metal wire is smaller than the inner diameter of the pore. After the metal wire is embedded in the pore, adjacent capillaries remain in direct contact with each other, without widening the gaps in the original capillary array due to the embedding of the metal wire. The metal wire is completely accommodated in the four corner pores of adjacent capillaries, thereby ensuring the regular structure of the square array and smoother and quality-guaranteed docking and coupling of optical elements.

[0048] In order for the tube body glass and the light absorbing layer glass to achieve their expected technical effects respectively, and to avoid or slow down the visible light crosstalk between adjacent capillaries, and at the same time to fix the position of the metal wire, the physical properties of the tube body glass and the light absorbing layer glass are strictly limited in the technical solution of the present invention. For example, the softening point of the tube body glass is limited to T1, the softening point of the light absorbing layer glass is limited to T2, and the difference between T1 and T2 is 60 to 150°C, that is, the softening point of the tube body glass is 60 to 150°C higher than the softening point of the light absorbing layer glass. This material and structural design can better control the capillary bundle at high The state during the warm pressure fusion process is achieved by controlling the melting temperature of the billet to be between the softening point of the light absorbing layer glass and the softening point of the tube body glass. In this way, on the one hand, since the softening point of the tube body glass is higher than the melting temperature, the tube body glass will not soften and deform during the melting process, thereby ensuring that the capillary tube does not deform. On the other hand, since the softening point of the light absorbing layer glass is lower than the melting temperature, the light absorbing layer glass softens and flows during the melting process, thereby filling the gaps between the capillaries and tightly covering the metal wires between the capillaries, thereby stably fixing the metal wires in the capillary tube bundle, and simplifying the preparation process.

[0049] Furthermore, in order to more accurately control the process and ensure good structural consistency of the prepared capillary array, the present invention preferably controls the softening point of the tube body glass to be 60-100° C. higher than the softening point of the light absorbing layer glass.

[0050] The present invention also provides a liquid scintillator fiber optic panel, comprising the aforementioned capillary array. Each capillary in the capillary array is filled with liquid scintillator, and then capping components are applied to both ends of the liquid scintillator array to form a liquid scintillator fiber optic panel. One application of the capillary array in the technical solution of the present invention is to manufacture it into a liquid scintillator fiber optic panel.

[0051] The inner diameter of the capillary in the technical solution of the present invention should not be too low, specifically not less than 100 μm, so that sufficient liquid scintillator can be filled into a single capillary, thereby ensuring that the capillary array has high detection efficiency for fast neutrons after being made into a liquid scintillator fiber panel, and the strength of the capillary array can also be guaranteed; at the same time, in order to ensure that the liquid scintillator fiber panel has a high spatial resolution, the inner diameter of the capillary should not be too large, specifically not exceeding 1000 μm; the present invention preferably has an inner diameter of 100 to 1000 μm. According to different product performance requirements, the present invention further preferably has an inner diameter of 100 to 500 μm, and further preferably has an inner diameter of 100 to 200 μm.

[0052] The present invention also provides a method for preparing a capillary array, which specifically comprises the following steps:

[0053] The first step is to prepare the glass materials of the tube body glass and the light absorbing layer glass, whose softening point temperature should meet the above requirements; wherein the light absorbing layer glass is light absorbing glass, or the light absorbing layer glass includes light absorbing glass and low softening point glass.

[0054] The second step is to prefabricate the tube body glass and the light absorption layer glass, including:

[0055] The glass material of the tube body is processed into a glass tube. In order to make the drawn capillary have a circular aperture, the cross section of the glass tube is preferably processed into a ring-shaped cross section with circular inner and outer contours; the wall thickness of the glass tube is controlled to be 2 to 4 mm, and the inner diameter is 20 to 50 mm; the reason for setting the wall thickness of the glass tube to 2 to 4 mm is to make the final capillary have the necessary strength, while not reducing the detection efficiency due to excessive wall thickness and low duty cycle; the reason for setting the above-mentioned glass prefabricated diameter size is that if the tube is made too thin, the material utilization rate may be low, and if the tube is made too thick, it will cause defects and problems during glass drawing, such as large temperature differences in the tube body, resulting in poor pore uniformity of the capillary prepared subsequently.

[0056] The light-absorbing layer glass material is processed into glass rods, each of which has a circular cross-section and an outer diameter of 20 to 50 mm. The glass rods are then drawn into single filaments with a circular cross-section, and the outer diameter of the single filaments is controlled to be 0.3 to 2 mm. The outer diameter size of the circular single filament is set so that it can be wrapped around the periphery of the glass tube without excessively reducing the duty cycle of the capillary, thereby ensuring the resolution performance of subsequent products. Regarding the selection of the outer diameter size of the above-mentioned glass rods, if the glass rods are too thin, the material utilization rate may be low, while if the glass rods are too thick, defects and problems may occur during glass drawing. For example, the temperature difference between the center area and the periphery of the glass rod is large, resulting in poor pore uniformity of the capillary prepared subsequently.

[0057] The third step is to arrange the drawn monofilaments in a fully covered manner on the periphery of the glass tube to form a glass preform tube, as shown in the attached Figure 3 As shown, it can absorb crosstalk light in all directions. That is, the glass preform tube in the technical solution of the present invention includes two layers of glass: one layer is the glass of the glass tube body itself, and the other layer is a monofilament glass covering the outside of the glass tube body. The monofilaments can all be monofilaments drawn from light-absorbing glass. However, if the absorption effect of the light-absorbing glass is too strong and its content is too high, the light-absorbing components may diffuse into the interior of the capillary and absorb effective light. In this case, the proportion of the light-absorbing glass monofilaments can be appropriately reduced. Therefore, the monofilaments can also include low-softening-point glass monofilaments 5 and light-absorbing glass monofilaments 4, which are mixed in a certain ratio and arranged according to a predetermined arrangement rule. In specific operation, the mixing ratio of the two can be determined according to the absorption capacity of the light-absorbing glass. If the absorption capacity of the light-absorbing glass is strong, the proportion of the light-absorbing glass can be reduced, and vice versa.

[0058] The present invention employs a light-absorbing glass with a lower softening point than the body glass as a cladding layer between the capillaries. The light-absorbing glass absorbs crosstalk between the capillaries, while its low softening point also improves the capillaries' shape retention. This is because the softening point of the selected light-absorbing glass is lower than that of the body glass. The absorbing layer glass exhibits fluidity during high-temperature melting and pressing, allowing it to both fill the gaps between the capillaries and coat the metal wires. The body glass remains unsoftened at this point, effectively maintaining the capillary shape. Alternatively, the present invention employs both a light-absorbing glass with a lower softening point than the body glass and a low-softening-point glass as a cladding layer between the capillaries. In addition to achieving all of the aforementioned benefits, the addition of a portion of the low-softening-point glass modifies the light absorption of the absorbing layer, effectively preventing light crosstalk between the capillaries while preventing adverse effects such as misabsorption of light within the capillaries.

[0059] The fourth step is to draw the glass preform tube to obtain a capillary tube with a circular cross section; the inner diameter of the capillary tube is controlled to be 100-1000 μm. The drawing process of the glass preform tube can be selected from the glass tube drawing process in the prior art and is not specifically limited in the present invention.

[0060] The fifth step is to arrange the circular capillaries and metal wires into a square capillary array according to preset specifications; wherein the wire diameter d of the metal wire and the outer diameter D' of the capillary satisfy the following relationship: The length of the wire is comparable to the length of the capillary tube.

[0061] In a specific embodiment of the present invention, the specific arrangement steps are as follows:

[0062] The capillaries are arranged adjacent to each other in a layer to form a capillary layer. During the arrangement, the capillaries' axes are parallel to each other, the bodies of adjacent capillaries touch each other, and recessed areas are formed between adjacent capillaries. This arrangement can be performed in a mold of predetermined specifications. A metal wire of a predetermined size is placed in each recessed area of ​​the capillary layer to form a capillary layer with metal wires.

[0063] Place capillaries on the capillary layer where metal wires are placed; when placing them, the axes of the newly placed capillaries are parallel to the axes of the capillaries in the previous capillary layer, and are aligned with the axes of the capillaries at corresponding positions in the previous capillary layer, so that they form a square arrangement structure that is aligned correctly, and there is no misalignment between the capillaries in the upper and lower layers. Place metal wires of preset sizes in each recessed area of ​​the new capillary layer to form a new capillary layer where metal wires are placed. Repeat this step multiple times until the capillary array reaches the preset number of metal wire layers. Finally, place the last layer of capillaries on the capillary layer where metal wires are placed according to the same capillary placement rules mentioned above, and bundle them to obtain a billet containing N capillary layers; N is a natural number greater than or equal to 3.

[0064] The sixth step involves placing the billet into a melting and pressing mold for high-temperature melting and pressing. The melting and pressing temperature is above the softening point of the glass on the outer capillary tubes but below the softening point of the glass in the capillary body. In other words, the melting and pressing temperature, T, satisfies the following equation: T2 < T < T1. At this melting and pressing temperature, the light-absorbing layer softens while the capillary body remains intact, allowing the capillaries to fuse together through the light-absorbing layer glass. At the same time, the capillaries maintain their circular shape, and the metal wires are encapsulated by the light-absorbing layer glass.

[0065] After high-temperature melting and pressing, the light-absorbing glass on the outsides of adjacent capillaries fuses with each other, and part of the light-absorbing glass fills the four-corner pores. As a result, the axial center distance D between two adjacent capillaries is slightly smaller than the capillary outer diameter D'. In the technical solution of the present invention, in order to ensure that the adjacent capillaries can still be arranged according to the preset rules after the metal wire is placed, and to ensure good connection performance of the finished product, in the present invention, whether the capillary outer diameter D' or the axial center distance D between two adjacent capillaries is used as the reference, the wire diameter d of the metal wire is less than 0.414 times of them.

[0066] The seventh step is end-face machining. This involves using a cutting machine to create a flat surface perpendicular to the capillary axis. The billet is then ultrasonically cleaned and dried. Water is used as a coolant during cutting to facilitate subsequent cleaning. Ultrasonic cleaning and drying remove impurities such as glass chips and cutting fluid that may have entered the capillary during end-face machining.

[0067] The present invention will be further described below with reference to specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0068] Unless otherwise specified, the materials and reagents mentioned below are commercially available products familiar to those skilled in the art. Unless otherwise specified, the methods described are all well-known methods in the art. Unless otherwise defined, technical or scientific terms used shall have the same meanings as those commonly understood by those skilled in the art.

[0069] Example 1

[0070] This example fabricated a capillary array and liquid scintillator fiber panel using three glass materials: the tube body glass had a softening point of 610°C; the light-absorbing layer glass consisted of two types: the light-absorbing glass had a softening point of 550°C, and the low-softening-point glass had a softening point of 545°C. The metal wire was a gold wire with a diameter of 30 μm.

[0071] The specific preparation process is as follows:

[0072] 1) The glass material of the tube body is processed into a glass tube with a circular cross section, a wall thickness of 2.5 mm and an inner diameter of 30 mm.

[0073] 2) The light-absorbing glass and the low-softening-point glass are processed into glass rods with a circular cross-section and an outer diameter of 20 mm. The circular glass rods are drawn into circular light-absorbing monofilaments and low-softening-point glass monofilaments, wherein the outer diameter of the light-absorbing monofilaments and low-softening-point glass monofilaments is 0.3 mm.

[0074] 3) The low softening point glass monofilaments and the light absorbing monofilaments are mixed in a ratio of 1:1 and arranged on the periphery of the circular glass tube in a fully covering manner to form a glass preform tube.

[0075] 4) The glass preformed tube is drawn to obtain a capillary tube with a circular cross section, an inner diameter of 100 μm, and an outer diameter of 120 μm.

[0076] 5) Arranging a capillary array within a mold having a set of opposing vertical surfaces with a thickness of 12 mm. The specific steps are as follows: Arrange the capillaries adjacent to each other in a layer to form a capillary layer with a width (perpendicular to the capillary axis) of 12 mm. When arranging, the capillary axes are parallel to each other, the tube bodies of adjacent capillaries are in contact with each other, and recessed areas are formed between adjacent capillaries.

[0077] A metal wire of set size and material is placed in each concave area of ​​the capillary layer to form a capillary layer for placing the metal wire.

[0078] Place capillaries on the capillary layer of wire. When placing capillaries, ensure the axes of the newly placed capillaries are parallel to the axes of the capillaries in the previous capillary layer and are aligned with the axes of the capillaries in the corresponding positions in the previous capillary layer, forming a square arrangement with no misalignment between the capillaries in the upper and lower layers. Place a wire of a preset size in each recess of the new capillary layer to form a new capillary layer of wire. Repeat this step multiple times. Finally, place a final layer of capillaries on the capillary layer of wire according to the same capillary placement rules as above and bundle them together to form a capillary array with a side-to-side dimension of 12 mm.

[0079] 6) The billet is placed into a melting mold and melt-pressed at 593°C.

[0080] 7) Using water as a coolant, a cutting machine is used to process the end face of the melt-pressed billet into a plane perpendicular to the capillary axis; the billet is ultrasonically cleaned and dried.

[0081] A capillary tube was filled with liquid scintillator and sealed with a quartz lens and a 10μm core diameter fiber optic panel at each end. The performance of the liquid scintillator fiber optic panel was tested, and the visible light resolution of the panel was 4 lp / mm, and the spatial resolution for fast neutrons was 2.24 lp / mm.

[0082] Examples 2 to 6

[0083] Same as Example 1, specific parameter changes are shown in Table 1 below:

[0084] Table 1

[0085]

[0086]

[0087] Comparative Examples 1 to 6

[0088] The process parameters correspond one to one with those in Examples 1 to 6; the only difference is that no metal wires are provided in the four corner pores, but only the corresponding light absorbing glass is filled in.

[0089] The same method was used to detect the spatial resolution of fast neutrons in each comparison example. The results are shown in Table 2 below:

[0090] Table 2

[0091]

[0092]

[0093] In the above table, the improvement rate is calculated based on the corresponding comparative example test data and the corresponding embodiment test data as the improvement result.

[0094] The test data shown in Table 2 demonstrates that, for capillary arrays of identical dimensions, the placement of metal wires within the four corner pores formed by adjacent capillaries significantly improves fast neutron resolution; the improvement is at least 70%, and in some embodiments, even exceeds 200%.

[0095] The technical features in the claims and / or the specification of the present invention may be combined, and the manner of combination is not limited to the combination obtained by reference in the claims. The technical solutions obtained by combining the technical features in the claims and / or the specification are also within the scope of protection of the present invention.

[0096] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A capillary array, characterized in that: It includes: A capillary bundle is composed of multiple glass capillaries with parallel axes; a light absorbing layer of glass is provided between any two of the capillaries; the softening point of the glass body of the glass capillary is T1, and the softening point of the glass of the light absorbing layer is T2, wherein the difference between T1 and T2 is 60 to 150°C; A metal wire is embedded between at least three adjacent capillaries; the space between the at least three adjacent capillaries is filled with the light-absorbing layer of glass; the light-absorbing layer of glass is wrapped around the outside of the metal wire to secure it; the capillary array is a square array; the metal wire is embedded in the four corners of the gap surrounded by the four adjacent capillaries; the wire diameter d of the metal wire and the axial center distance D between two adjacent capillaries satisfy the following relationship:

2. The capillary array according to claim 1, wherein The inner diameter of the capillary is 100-1000 μm.

3. The capillary array according to claim 2, wherein: The inner diameter of the capillary is 100-500 μm.

4. The capillary array according to claim 1, wherein The light absorbing layer is composed of light absorbing glass; or, the light absorbing layer is composed of light absorbing glass and low softening point glass.

5. The capillary array according to claim 1, wherein The material of the metal wire is selected from at least one of platinum, gold and tungsten; and the wire diameter d of the metal wire is ≥30 μm.

6. The capillary array according to claim 1, wherein The difference between T1 and T2 is 60 to 100°C.

7. A method for preparing a capillary array, wherein the capillary array is a square array, characterized in that: It includes the following steps: S1: drawing a glass preform tube to obtain a capillary tube; each of the glass preform tubes is composed of a tube body glass and a light absorbing layer glass adjacent to each other; the softening point of the tube body glass is T1, and the softening point of the light absorbing layer glass is T2, wherein the difference between T1 and T2 is 60 to 150°C; S2: arranging the capillaries adjacent to each other into a layer; the capillary axes are parallel; and recessed areas are formed between adjacent capillaries; S3: placing a metal wire of a preset size in each recessed area to form a capillary layer for placing the metal wire; the metal wire is embedded in the four corner pores surrounded by four adjacent capillaries; the wire diameter d of the metal wire and the axial center distance D between two adjacent capillaries satisfy the following relationship: S4 alternately performs step S2 and step S3 N-1 times and N-2 times on the capillary layer on which the metal wire is placed, and bundles the billet to obtain a billet containing N capillary layers; N is a natural number greater than or equal to 3; S5: Melting and pressing the billet, cutting the two end faces flat, and obtaining a capillary array; the temperature T of the melting and pressing is: T2<T<T1.

8. The preparation method according to claim 7, characterized in that The preparation method of the glass preformed tube is as follows: S11, processing the tube body glass into a glass tube; the cross section of the glass tube is a ring-shaped cross section with circular inner and outer contours; processing the light absorbing layer glass into a glass rod with a circular cross section; and drawing the glass rod into a glass monofilament; S12. Arrange the glass monofilaments in a fully encapsulated manner on the periphery of the glass tube to form a glass preform tube; the glass monofilaments are light-absorbing glass monofilaments; or, the glass monofilaments are light-absorbing glass monofilaments and low-softening-point glass monofilaments.

9. A liquid scintillator optical fiber panel, characterized in that: It includes: The capillary array according to any one of claims 1 to 6; Liquid scintillator, filled in each capillary of the capillary array; The end-sealing components cover both ends of the capillary array filled with the liquid scintillator.

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