Capillary tube array and preparation method and application thereof

Abstract

The invention provides a capillary array and a preparation method and application thereof. The capillary tube array comprises a capillary tube bundle which is composed of a plurality of glass capillary tubes with parallel axes; light absorption layer glass is arranged between any two capillary tubes; the softening point of the tube body glass of the glass capillary tube is T1, the softening point of the light absorption layer glass is T2, and the difference value between T1 and T2 is 60-150 DEG C; the metal wires are embedded among at least three adjacent capillary tubes; the space between the at least three adjacent capillary tubes is filled with the light absorption layer glass; the light absorption layer glass wraps the outer side of the metal wire to fix the metal wire. The technical problem to be solved by the invention is how to prepare the capillary tube array, so that the liquid flash optical fiber panel prepared from the capillary tube array has the capability of resisting recoil proton crosstalk, light crosstalk resistance, high spatial resolution and simple preparation process, thereby being more practical.

Description

Technical Field

[0001] The 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, which is a capillary array filled with liquid scintillator. The detection principle is: fast neutrons hit the hydrogen nuclei in the liquid scintillator, elastic scattering occurs, and recoil protons are generated. The recoil protons excite the liquid scintillator to emit visible fluorescence; part of the visible fluorescence is totally reflected on 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 time, each multifilament contains a plurality of capillary fibers; then, the multifilament is cut into a capillary fiber bundle, which is then heated and fused to form a billet; finally, both ends of the billet are cut into planes, liquid scintillator is filled into the capillary, and both ends are 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 incident direction of the fast neutrons, and stimulate fluorescence in the multiple capillaries, so that the fluorescence range greatly exceeds the incident range of the fast neutrons, resulting in a decrease in the spatial resolution 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 a preparation method and application thereof. 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 a simple preparation process, thereby being more suitable for practical use.

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

[0007] The capillary bundle is composed of a plurality of glass capillaries with parallel axes; a light absorbing layer of glass is arranged between any two of the capillaries; the softening point of the glass of the glass capillary body 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 outer side 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 corners of the 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 to 100°C.

[0017] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to a method for preparing a capillary array proposed by the present invention, the method 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 axes of the capillaries are parallel; and recessed areas are formed between adjacent capillaries;

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

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

[0022] S5: melt-pressing the billet, cutting two end faces flat, and obtaining a capillary array; the temperature T of the melt-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 absorption layer glass into a glass rod with a circular cross section; drawing the glass rod into a glass monofilament;

[0026] S12, arranging 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 the technical problem are also achieved by adopting the following technical solutions. A liquid scintillator optical fiber panel proposed in the present invention comprises:

[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, a capillary array and a preparation method and application thereof proposed by the present invention have at least the following advantages:

[0032] The present invention proposes a capillary array and a preparation method and application thereof. By arranging a metal wire in a gap surrounded by at least three adjacent capillaries and utilizing the shielding effect of the metal material on radiation, when the capillary array is applied to a liquid scintillator fiber panel, the crosstalk of recoil protons between different capillaries can be effectively prevented. Furthermore, by preferably selecting the material of the metal wire as a metal with a high atomic number, the prepared liquid scintillator fiber panel can effectively prevent the 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 and a preparation method and application thereof, which, by limiting that a light absorbing layer of glass is provided between any two glass capillaries, that is, the light absorbing layer of glass is coated on the outside of the glass capillary body, can better block the crosstalk light between the capillaries in the liquid scintillator fiber panel, avoid or slow down the light crosstalk between two adjacent capillaries, thereby improving the spatial resolution of the liquid scintillator fiber panel.

[0034] The present invention provides a capillary array and a preparation method and application thereof. The capillary tube body is coated with a light absorbing layer glass layer, and the softening point of the tube body glass is strictly controlled to be 60-150°C higher than the softening point of the light absorbing layer glass. This structural design can better control the state of the capillary tube bundle during the high-temperature pressure fusion process. The melting and pressing temperature of the billet is controlled 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 tube body glass has a melting point higher than the melting and pressing temperature, the tube body glass will not soften and deform during the melting and pressing process, thereby ensuring that the capillary tube does not deform. On the other hand, since the light absorbing layer glass has a melting point lower than the melting and pressing temperature, the light absorbing layer glass softens and flows during the melting and pressing process, thereby filling the gaps between the capillaries and tightly coating the metal wires between the capillaries, thereby stably fixing the metal wires in 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 in conjunction with 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 It is a schematic diagram of the structure of a tetragonally arranged capillary bundle before melting and pressing;

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

[0040] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a capillary array and its preparation method and its specific implementation, structure, features and effects proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

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

[0042] The capillary array also includes a metal wire 3; the metal wire is embedded in the space surrounded by at least three adjacent capillaries; the light absorbing layer glass is filled between at least three adjacent capillaries; the light absorbing layer glass is coated on the outside of the metal wire to fix it. The technical solution of the present invention arranges a metal wire in the gap surrounded by adjacent capillaries, utilizes the shielding effect of metal materials on radiation, and when the capillary array provided with the metal wire is applied to the liquid scintillator optical fiber panel, the penetration length of the recoil protons is better controlled, and the crosstalk of the recoil protons between different capillaries is effectively prevented, which can effectively prevent the crosstalk of the recoil protons and improve the spatial resolution of fast neutrons as much as possible.

[0043] Furthermore, the present invention selects the material of the metal wire to be a metal with a high atomic number, preferably at least one of platinum, gold and tungsten; and controls the wire diameter of the metal wire to be d≥30μm. After the recoil protons hit the metal wire, their energy will be absorbed or reduced, 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 tetragonal array, as shown in the attached Figure 1 and attached Figure 2As shown, the meaning of the square arrangement described in the present invention is that the specifications of each capillary are the same when each capillary layer is arranged, the axis positions are aligned vertically, the capillaries of 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 to each other as a whole, and tightly covers the metal wire, and fixes and bonds 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 size setting is to ensure that the wire diameter of the embedded metal wire is smaller than the inner diameter of the pore, so that after the metal wire is embedded in the pore, the adjacent capillaries are still in direct contact with each other, and the gap in the original capillary array will not be enlarged due to the embedding of the metal wire. The metal wire is completely accommodated in the four corner pores of the adjacent capillaries, thereby ensuring the regular structure of the square array, and the optical elements are smoothly coupled to each other, with guaranteed quality.

[0048] In order to achieve the expected technical effects of the tube body glass and the light absorption layer glass respectively, the visible light crosstalk between adjacent capillaries can be avoided or mitigated, and the position of the metal wire can be fixed, the physical properties of the tube body glass and the light absorption 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 absorption 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 that of the light absorption 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 tube body glass has a softening point higher than the melting temperature, the tube body glass will not soften and deform during the melting process, thereby ensuring that the capillary does not deform. On the other hand, since the light absorbing layer glass has a softening point 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 bundle, and the preparation process is simple.

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

[0050] The present invention also proposes a liquid scintillator optical fiber panel, which includes the aforementioned capillary array, each capillary of the capillary array is filled with liquid scintillator, and then the two ends of the capillary array filled with liquid scintillator are covered by a sealing component to form a liquid scintillator optical fiber panel. One of the uses of the capillary array in the technical solution of the present invention is to prepare it into a liquid scintillator optical fiber panel.

[0051] In the technical solution of the present invention, the inner diameter of the capillary should not be too low, specifically not less than 100 μm, so that enough liquid scintillator can be filled into a single capillary, thereby ensuring that the capillary array has a high detection efficiency for fast neutrons after being made into a liquid scintillator optical 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 optical 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 requirements for product performance, the present invention further preferably has an inner diameter of 100 to 500 μm for the capillary, and further preferably has an inner diameter of 100 to 200 μm for the capillary.

[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 glass materials for 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 2-4 mm, and the inner diameter is 20-50 mm; the reason for setting the wall thickness of the glass tube to 2-4 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 in the glass drawing, such as large temperature differences in the tube body, resulting in poor pore size uniformity of the capillary prepared subsequently.

[0056] The glass material of the light absorbing layer is processed into a glass rod, the cross section of the glass rod is circular, and the outer diameter of the glass rod is 20 to 50 mm; then, the aforementioned glass rod is drawn into a single wire with a circular cross section, and the outer diameter of the single wire is controlled to be 0.3 to 2 mm; the reason for setting the outer diameter size of the circular single wire is to ensure that it can be wrapped around the periphery of the glass tube without reducing the duty cycle of the capillary too much, so as to ensure the resolution performance of subsequent products; in terms of the selection of the outer diameter size of the above-mentioned glass rod, if the glass rod is too thin, it may lead to low material utilization, and if the glass rod is too thick, it will cause defects and problems in glass drawing, such as a large temperature difference between the central area and the periphery of the glass rod, resulting in poor pore size 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 the crosstalk light in all directions at 360°. That is, the body of the glass prefabricated 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 the monofilament glass wrapped on the outside of the glass tube body; wherein, 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 component may diffuse into the interior of the capillary to absorb effective light. At this time, the proportion of the light-absorbing glass monofilaments can be appropriately reduced, so the monofilaments can also include low-softening-point glass monofilaments 5 and light-absorbing glass monofilaments 4 at the same time, and the two are mixed in a certain proportion and arranged according to a predetermined arrangement rule; in specific operations, 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 is reduced, and vice versa.

[0058] The present invention sets a light-absorbing glass with a softening point lower than that of the tube body glass as a cladding layer between the capillaries; on the one hand, the light-absorbing glass can be used to absorb the crosstalk light between the capillaries, and its low softening point can also improve the shape retention of the capillaries; this is because the softening point of the selected light-absorbing glass is lower than that of the tube body glass, and the glass of the absorption layer has fluidity when melted and pressed at high temperature, which can not only fill the pores between the capillaries, but also cover the metal wires, while the tube body glass has not softened at this time, and can effectively maintain the shape of the capillaries. Alternatively, the present invention sets a light-absorbing glass with a softening point lower than that of the tube body glass and a low-softening-point glass as a cladding layer between the capillaries; in addition to having all the above-mentioned effects, adding a portion of the low-softening-point glass can adjust the light absorption effect of the absorption layer, so that it can better avoid light crosstalk between the capillaries, and will not cause adverse effects such as misabsorption of the light inside 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 the present invention does not make any specific limitation.

[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; when arranged, the axes of the capillaries are parallel to each other, the bodies of adjacent capillaries are in contact with each other, and a recessed area is formed between the adjacent capillaries; the above arrangement can be performed in a mold of set specifications. A metal wire of a preset size is placed in each recessed area of ​​the capillary layer to form a capillary layer in which the metal wire is placed.

[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 the corresponding positions in the previous capillary layer, so that they form a square arrangement structure that is aligned correctly, and the capillaries in the upper and lower layers cannot be misaligned. 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 as 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 is to load the billet into the melting and pressing mold for high-temperature melting and pressing. The melting and pressing temperature is higher than the softening point of the glass on the outside of the capillary and lower than the softening point of the glass on the capillary body, that is, the melting and pressing temperature T is: T2<T<T1. At this melting and pressing temperature, the light absorbing layer is already in a softened state while the body of the capillary is still not softened, so that the capillaries are mutually fused through the light absorbing layer glass, while the capillary can still maintain a circular structure, and the metal wire is also covered by the light absorbing layer glass.

[0065] After high-temperature melting and pressing, the light-absorbing glasses on the outer sides of adjacent capillaries fuse with each other, and part of the light-absorbing glasses fill the four-corner pores, so the axial center distance D of two adjacent capillaries will be slightly smaller than the outer diameter D' of the capillaries; in the technical solution of the present invention, in order to ensure that the adjacent capillaries can still be arranged according to preset rules after the metal wire is placed, and to ensure good connection performance of the finished product, in the present invention, whether the outer diameter D' of the capillary or the axial center distance D of 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 to perform end surface processing. The specific operation is to use a cutting machine to process the end surface into a plane perpendicular to the axis of the capillary; then the billet is ultrasonically cleaned and dried. When cutting, water is used as a coolant to facilitate subsequent cleaning. The billet is ultrasonically cleaned and dried to remove impurities such as glass debris or cutting fluid that enter the capillary during end surface processing.

[0067] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field 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, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0069] Example 1

[0070] In this embodiment, a capillary array and a liquid scintillator optical fiber panel are prepared, wherein three types of glass materials are used: the softening point of the tube glass is 610°C; the light absorption layer glass includes two types, wherein the light absorption glass softening point is 550°C and the low softening point glass softening point is 545°C. The metal wire is a gold wire with a diameter of 30 μm.

[0071] The specific preparation process is as follows:

[0072] 1) The tube body glass material 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) Processing the light absorbing glass and the low softening point glass into glass rods with a circular cross section and an outer diameter of 20 mm. Drawing the circular glass rods into circular light absorbing monofilaments and low softening point glass monofilaments, wherein the outer diameters of the light absorbing monofilaments and low softening point glass monofilaments are 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 a 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) Arrange a capillary array in a set of opposite sides of a mold with a width of 12 mm on the inner side. 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 axis of the capillaries) of 12 mm; when arranging, the axes of the capillaries are parallel to each other, the bodies of adjacent capillaries are in contact with each other, and a recessed area is formed between adjacent capillaries.

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

[0078] 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 the corresponding positions in the previous capillary layer, so that they form a square arrangement structure that is aligned correctly, and the capillaries in the upper and lower layers cannot be misaligned. 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. 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 capillary array with a side size of 12 mm.

[0079] 6) Load the billet into the melting and pressing mold and melt-press 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, the plane being perpendicular to the axial direction of the capillary; the billet is ultrasonically cleaned and dried.

[0081] The capillary was filled with liquid scintillator and sealed with a quartz lens and a 10μm core diameter optical fiber panel at both ends. The performance of the liquid scintillator optical fiber panel was tested, and the visible light resolution of the liquid scintillator optical fiber panel was 4lp / mm; the spatial resolution of the fast neutrons was 2.24lp / mm.

[0082] Embodiments 2 to 6

[0083] Same as in 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 arranged in the four corner holes, but only corresponding light absorbing glass is filled in them.

[0089] The spatial resolution of fast neutrons in each comparative example was tested using the same method, and 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] It can be seen from the test data shown in Table 2 that for capillary arrays of the same size, the fast neutron resolution is greatly improved after metal wires are arranged in the four-corner pores formed by adjacent capillaries; the fast neutron resolution can be improved by at least 70%, and in some embodiments, the improvement rate can even reach more than 200%.

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

[0096] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A capillary array, characterized in that: It includes: The capillary bundle is composed of a plurality of glass capillaries with parallel axes; a light absorbing layer of glass is arranged between any two of the capillaries; the softening point of the glass of the glass capillary body 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; 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 outer side of the metal wire to fix it.

2. The capillary array according to claim 1, characterized in that: The inner diameter of the capillary is 100-1000 μm.

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

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

6. The capillary array according to claim 1, characterized in that: 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:

7. The capillary array according to claim 1, characterized in that: The difference between T1 and T2 is 60 to 100°C.

8. A method for preparing a capillary 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 axes of the capillaries are parallel; and recessed areas are formed between adjacent capillaries; S3 places a metal wire of a preset size in each concave area to form a capillary layer for placing the metal wire; S4, on the capillary layer where the metal wire is placed, alternately performing step S2 and step S3 N-1 times and N-2 times, bundling, to obtain a billet including N capillary layers; N is a natural number greater than or equal to 3; S5: melt-pressing the billet, cutting two end faces flat, and obtaining a capillary array; the temperature T of the melt-pressing is: T2<T<T1.

9. The preparation method according to claim 8, 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 absorption layer glass into a glass rod with a circular cross section; drawing the glass rod into a glass monofilament; S12, arranging the glass monofilaments in a fully covering 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.

10. A liquid scintillator optical fiber panel, characterized in that: It includes: The capillary array according to any one of claims 1 to 7; 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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