Glass air chamber as well as preparation method and application thereof

Abstract

The invention provides a glass air chamber and a preparation method and application thereof. The preparation method comprises an inner core prototype and shell prototype preparation step, a glass air chamber prototype preparation step and a glass air chamber preparation step, and the first expansion pipe section with the first cylinder and the second expansion pipe section with the second cylinder are prepared through the inner core prototype and shell prototype preparation step. In the glass air chamber prototype preparation step, the annular glass air chamber prototype is obtained by sealing the two ends of the first cylinder and the second cylinder. In the step of preparing the glass air chamber, the position of one diameter of the annular glass air chamber prototype is softened, shrunk and folded, and the glass air chamber is prepared. The glass gas chamber obtained by the preparation method provided by the invention has a large receiving angle, and can be applied to scientific research experiments of large-divergence-angle emergent neutrons with the span as high as 180 degrees.

Description

Technical Field

[0001] The invention relates to the technical field of glass preparation, and in particular to a glass gas chamber and a preparation method and application thereof. Background Art

[0002] As the only means that can effectively separate nuclear, magnetic, coherent, and incoherent scattering, polarized neutron technology is an advanced experimental technology and method that is urgently needed for the study of complex materials. When conducting polarized neutron scattering experiments, neutron spin filtering devices need to be installed at the incident and exit ends of the sample as neutron polarizers and neutron analyzers, respectively. Among them, the neutrons at the exit end often have a wider wavelength range, and the angular range formed by their scattered flight directions is generally larger. Based on these two points, realizing spin filtering of the exiting neutrons has become a difficult problem. At present, commonly used neutron spin filtering devices include polarization monochromators, super-mirror polarizers, and polarization-based 3 He spin filter, compared with polarization monochromator and super-mirror polarizer, is based on polarization 3 He neutron polarization technology has become the mainstream in the world due to its significant advantages such as large acceptance angle, high polarization rate, low background, wide energy spectrum, and uniform polarization and analysis capabilities.

[0003] Based on polarization 3 There are two techniques for He neutron polarization: 3 He gas is polarized, which are metastable exchange optical pumping (MEOP) technology and spin exchange optical pumping (SEOP) technology. The core components of SEOP technology are N2, 3 Polarization of He gas and alkali metals (usually K and Rb) 3 He glass gas chambers are generally cylindrical, but the end faces of cylindrical glass gas chambers have limited coverage angles, often only covering an angle range of ±5°, and cannot be applied to scientific research experiments with large divergence angles of neutrons with a span of up to 180°. Therefore, developing a large receiving angle (wide angle) glass gas chamber suitable for SEOP technology is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a glass gas chamber and a preparation method and application thereof. The glass gas chamber has a large receiving angle and can be applied to scientific research experiments of neutrons with a large divergence angle spanning up to 180°.

[0005] The first aspect of the present application provides a method for preparing a glass gas chamber, comprising: the steps of preparing an inner core prototype and an outer shell prototype: fixing a hollow glass tube on a processing device, softening, expanding and flattening part of the glass tube so that the diameter of the softened part increases, and obtaining a first expansion tube section having a first cylinder; adopting the same method to prepare a second expansion tube section having a second cylinder, the difference being that the diameter of the second cylinder is larger than the diameter of the first cylinder, and the height of the second cylinder is smaller than the height of the first cylinder; then cutting radially at one end of the curved surface of the first cylinder to obtain an inner core prototype having a first opening; and cutting a circular second opening at the center of the side surface of the second expansion tube section on one side of the second cylinder to obtain an outer shell prototype; the steps of preparing a glass gas chamber prototype: first fixing the inner core prototype and the outer shell prototype on the two ends of the processing device respectively, and making the first opening face the second opening, and then driving the processing device so that the first opening is formed from the second opening. The opening extends into the second cylinder, and the first cylinder passes through the second cylinder; then a glass neck is sintered on the outer surface of the curved surface of the second cylinder; then a circular third opening is cut out from the center of the side of the second expansion tube section that is away from the second opening, so that the first opening extends out of the third opening, and the first opening and the third opening are sealed; then the second cylinder is fixed to one end of the processing device, the inner core prototype is cut off to remove the part of the first cylinder, and the first cylinder with the fourth opening is obtained; the second opening and the fourth opening are sealed to obtain a circular glass gas chamber prototype; glass gas chamber preparation steps: first fix the glass gas chamber prototype on the processing device, and ventilate the glass gas chamber prototype from the glass neck, then soften the position of the single diameter of the glass gas chamber prototype, and drive the processing device to move the glass gas chamber prototype on both sides of the diameter away from each other until the softened part shrinks and closes, separates to form two independent halves, and the glass gas chamber preparation is completed.

[0006] In the present application, a glass gas chamber prototype in the shape of a ring is obtained by interlocking the first cylinder and the second cylinder, and the first opening and the third opening are sintered, and the second opening and the fourth opening are sintered, and then the glass gas chamber prototype is softened and separated along a diameter of the glass gas chamber prototype in the shape of a ring to obtain a glass gas chamber prototype in the shape of a semi-ring. The preparation method is simple and economical, and the prepared glass gas chamber has a large receiving angle, is suitable for SEOP technology, and can be applied to scientific research experiments of neutrons with a large divergence angle of up to 180°.

[0007] In one embodiment, in the steps of preparing the inner core prototype and the outer shell prototype, in the first expansion tube section, the outer diameter of the first cylinder is 5.8 cm, the axial height is 7-8 cm, and the wall thickness is 4 mm; in the second expansion tube section, the outer diameter of the second cylinder is 10 cm, the axial height is 3-4 cm, and the wall thickness is 4 mm; or, the diameter of the second opening and the fourth opening is 6 cm.

[0008] Since the first cylinder needs to pass through the second cylinder from the inside of the second cylinder, and both ends of the first cylinder extend out of the second cylinder, the outer diameter of the first cylinder is smaller than the outer diameter of the second cylinder, and the height of the first cylinder in the axial direction is greater than the height of the second cylinder in the axial direction. In addition, the sizes of the first cylinder and the second cylinder can be appropriately adjusted according to the different sizes of the glass gas chamber to be prepared.

[0009] In one embodiment, in the glass gas chamber prototype preparation step, after the first opening and the third opening are sealed, the second cylinder is fixed to one end of the processing device by a support, and then the rotation function of the processing device is started, and the support drives the first cylinder and the second cylinder to rotate around the axis, and then the inner core prototype is cut off to remove part of the first cylinder to obtain a first cylinder with a fourth opening; wherein the support has a fixed glass tube, the fixed glass tube is a hollow structure with openings at both ends, wherein one end opening is burnt to the glass neck, and the other end is fixed to the processing device.

[0010] In the present application, it is necessary to cut off the inner core prototype under the condition of rotation to remove the part of the first cylinder, and fix the second cylinder to one end of the processing device through the support. Since the first opening and the third opening are sealed, when the second cylinder is fixed, the first cylinder is also fixed. In addition, the present application requires the use of a hollow fixed glass tube and a glass necking to be sintered. If a solid glass rod is used, the glass necking may be blocked accidentally.

[0011] In one embodiment, in the glass gas chamber prototype preparation step, after the glass neck is sintered on the outer surface of the second cylindrical curved surface, one end of a connecting glass tube is sintered to the glass neck, and then the connecting glass tube is softened and the other end is sintered to the glass tube on the inner core prototype except the first cylinder, and then the connecting glass tube is cooled to relatively fix the relative positions of the outer shell prototype and the inner core prototype.

[0012] In the present application, the purpose of connecting the glass neck and the inner core prototype together by softening the connecting glass tube is achieved, so as to fix the relative positions of the outer shell prototype and the inner core prototype, so that when cutting the third opening, the inner core prototype and the outer shell prototype will not move relative to each other, affecting the cutting effect.

[0013] In one embodiment, in the steps of preparing the inner core prototype and the outer shell prototype, a flame temperature of 1500°C is used to burn a second circular opening at the center of the side surface of the second expansion tube section located on one side of the second cylinder to obtain the outer shell prototype; and / or, in the step of preparing the glass gas chamber prototype, a flame temperature of 1500°C is used to burn a third circular opening at the center of the side surface of the second expansion tube section away from the second opening.

[0014] The burning temperature of the second and third openings is relatively high, so as to complete the removal operation as quickly as possible and with high quality, and to avoid deformation at the incision.

[0015] In one embodiment, before the steps of preparing the inner core prototype and the outer shell prototype, a cleaning step is also included, and the cleaning step includes: using hydroxyethylidene diphosphonic acid to clean the hollow glass tube.

[0016] Hydroxyethylidene diphosphonic acid (HEDP) is used to clean the hollow glass tubes for preparing the inner core and outer shell prototypes. HEDP can form stable complexes with various metal ions such as iron, copper or zinc, and can be used as a cleaning agent to remove magnetic impurities on the surface of the glass gas chamber to avoid the glass gas chamber finished product caused by the presence of magnetic impurities. 3 Degradation of He polarizability.

[0017] A second aspect of the present application provides a glass gas chamber prepared by the preparation method of the first aspect.

[0018] In one embodiment, the invention comprises: a main body in the shape of a semicircular ring, wherein the outer surface of the main body away from the center of the semicircular ring has a connecting hole; the main body is used to store alkali metals and 3 He gas; the glass neck is a hollow structure with openings at both ends, and the opening at one end of the glass neck is connected to the connecting hole.

[0019] The main structure of the glass gas chamber provided by the present application is in the shape of a semicircular ring, and its horizontal coverage angle can reach 180° when placed horizontally, which can meet the use requirements of neutron scattering experiments that require polarization analysis of neutrons with large scattering angles. However, the horizontal coverage angle of an ordinary cylindrical glass gas chamber when placed horizontally is only 5 to 10°, which is generally only suitable for polarization analysis of emitted neutrons in neutron scattering experiments with small scattering angles.

[0020] In one embodiment, the connecting hole is located at the middle position of the outer surface of the main body away from the ring center; or, the inner diameter of the middle position of the glass neck is smaller than the inner diameters of the two end positions of the glass neck.

[0021] It should be noted that the connection hole may not be set in the middle position of the outer surface of the main body away from the ring center, but the hole position of the glass neck must avoid the neutron flight path to avoid interference with the neutron polarization analysis results. That is, when the neutron flight path is in the horizontal direction, the glass gas chamber is placed horizontally, and the hole position of the glass neck must be located above or below the outside of the glass gas chamber to avoid additional polarization interference to the neutrons passing through the main body of the glass gas chamber.

[0022] The third aspect of the present application provides a glass gas chamber in neutron polarization 3 In the application of He gas, the glass gas chamber is prepared by the preparation method of the first aspect; or, the glass gas chamber is the glass gas chamber of the second aspect.

[0023] The present application provides a glass air chamber and its preparation method and application, including the steps of preparing an inner core prototype and an outer shell prototype, the steps of preparing a glass air chamber prototype and the steps of preparing a glass air chamber prototype. First, prepare an inner core prototype and an outer shell prototype, wherein the inner core prototype includes a first cylinder having a first opening, and the outer shell prototype includes a second cylinder having a second opening, then fix the inner core prototype and the outer shell prototype on a processing device, and make the first opening face the second opening, drive the processing device, realize that the first cylinder penetrates the second cylinder, and seals the first opening and the third opening. Then cut out a third opening on the side of the outer shell prototype away from the second opening, and then cut off the inner core prototype to remove the part of the first cylinder, obtain a first cylinder with a fourth opening, seal the second opening and the fourth opening, and obtain a glass air chamber prototype. Then soften and separate the glass air chamber prototype at the position of a single diameter of the glass air chamber prototype, and finally obtain a semi-circular glass air chamber. In the present application, a semi-circular glass air chamber can be obtained by interlocking, sealing and softening the two cylindrical structures. The preparation method is simple and economical, and the obtained glass gas chamber has a large receiving angle and can be applied to scientific research experiments of neutrons with a large divergence angle of up to 180°. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a process flow chart for preparing the glass gas chamber of the present application;

[0025] Figure 2 This is a schematic diagram of the structure of the first expansion pipe section of the present application;

[0026] Figure 3 This is a schematic structural diagram of the inner core prototype of the present application;

[0027] Figure 4 This is a schematic diagram of the structure of the second expansion pipe section of the present application;

[0028] Figure 5 This is a schematic diagram of the structure of the second expansion pipe section in the present application without the second opening;

[0029] Figure 6 This is a schematic diagram of the structure in which the first cylinder penetrates the second cylinder in this application;

[0030] Figure 7 This is a schematic diagram of the structure of connecting the inner core prototype and the second cylinder through a connecting glass tube in the present application;

[0031] Figure 8 This is a schematic diagram of the structure in which a third opening is cut out of the second expansion pipe section in the present application;

[0032] Fig. 9 This is a schematic diagram of the structure after the first opening and the third opening are sealed in the present application;

[0033] Fig.10 A schematic diagram of a structure for fixing a second cylinder on a support member;

[0034] Fig.11 This is a schematic diagram of the structure of the fourth opening cut out in this application;

[0035] Fig.12 This is a schematic diagram of the structure of the glass gas chamber prototype;

[0036] Fig.13 A schematic diagram of a structure for softening and contracting a diameter position of a glass gas chamber prototype;

[0037] Fig.14 This is a schematic diagram of the structure of the glass gas chamber of Example 2 of the present application.

[0038] Figure numerals: first glass tube -10, second glass tube -20, first expansion tube segment -30, first cylinder -31, first opening -32, inner core prototype -33, fourth opening -34, second expansion tube segment -40, second cylinder -41, second opening -42, outer shell prototype -43, connecting hole -44, third opening -45, glass neck -50, connecting glass tube -60, support -70, first solid glass rod -71, first hollow glass tube -72, glass gas chamber prototype -80, glass gas chamber -90, main body -91. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0040] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0041] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0042] Example 1

[0043] This embodiment provides a method for preparing a glass gas chamber 90. Figure 1 The preparation method of the glass gas chamber 90 comprises the following steps:

[0044] Glass tube preparation steps: select two hollow first glass tubes 10 and two hollow second glass tubes 20. The first glass tubes 10 have an outer diameter of 12 mm, a wall thickness of 1.5 mm, and a length of 35 cm. The second glass tubes 20 have an outer diameter of 15 mm, a wall thickness of 1.5 mm, and a length of 85 cm. Both ends of the first glass tube 10 are open, and one end of the second glass tube 20 is open and the other end is closed.

[0045] Glass tube cleaning step: using hydroxyethylidene diphosphonic acid to clean the first glass tube 10 and the second glass tube 20.

[0046] Preparation steps of the inner core prototype 33: first, install a first glass tube 10 and a second glass tube 20 on the opposite ends of a glass lathe, respectively, and fix them with a three-claw clamp. The opening of the first glass tube 10 is inserted into the air inlet of the glass lathe, and the opening of the second glass tube 20 is connected to the opening of the first glass tube 10 away from the air inlet, and the axis of the first glass tube 10 and the axis of the second glass tube 20 are on the same straight line, which is the first axis. Then, the rotation function of the glass lathe is started to rotate the first glass tube 10 and the second glass tube 20 along the first axis at a speed of 30r / min, and then the flame of the flame gun at 1200-1400°C is used to fuse the joint of the first glass tube 10 and the second glass tube 20, and then the flame at a temperature of 1400°C is used to soften the joint. While fusing and softening, the air inlet of the glass lathe is used to blow air inward to expand the softened part and expand the diameter. After the diameter is expanded, the moving function of the glass lathe is started to move the second glass tube 20 toward the first glass tube 10 to achieve the stacking of the softened tube section so that there is enough glass material at the place for tube expansion. During this period, a handheld graphite plate is placed under the softened and expanded glass tube, and air is blown into the first glass tube 10 and the second glass tube 20 through the air inlet so that the expanded glass tube section contacts the graphite plate and is flattened by the graphite plate under the rotation of the glass lathe (the flame should be temporarily turned off during the use of the graphite plate to flatten the expanded glass tube section). Figure 2As shown, a first expansion tube section 30 having a first cylinder 31 is prepared, and the firing is stopped. The first cylinder 31 has an axial height of 7-8 cm, an outer diameter of 5.8 cm, and a thickness of 4 mm. The first expansion tube section 30 is heated as a whole using a 1400°C flame of a glass lathe flame gun, and the flame temperature is uniformly reduced at a rate of 150°C / min until the flame is insufficient to cover the entire first expansion tube section 30. The glass lathe flame gun can then be extinguished (this step is intended to achieve a slow and uniform cooling of the first expansion tube section 30 to avoid the glass tube bursting due to a too rapid drop in temperature). After the first expansion tube section 30 is naturally cooled, it is removed from the glass lathe, and then a diamond wheel glass cutting machine is used to cut radially at one end of the curved surface of the first cylinder 31, as shown in FIG. Figure 3 As shown, an inner core blank 33 having a first opening 32 is obtained.

[0047] Preparation steps of the shell prototype 43: The second expansion tube section 40 having the second cylinder 41 is prepared by the same method as the first expansion tube section 30. Figure 4 As shown, in the second expansion pipe section 40, the second cylinder 41 has an axial height of 3-4 cm, an outer diameter of 10 cm, and a thickness of 4 mm. The second expansion pipe section 40 is kept rotating at a speed of 30 r / min on the glass lathe, and then a bright blue sharp oxygen-rich flame of 1500° C. is used to burn a circular second opening 42 at the center of the side surface of the second expansion pipe section 40 located on one side of the second cylinder 41, as shown in FIG. Figure 5 As shown, the diameter of the second opening 42 is 6 cm, and a shell prototype 43 is obtained. The shell prototype 43 is then heated as a whole using a 1400°C flame of a lathe flame gun, and the flame temperature is uniformly reduced at a rate of 150°C / min until the flame is insufficient to cover the entire shell prototype 43. The glass lathe flame gun can be extinguished, and after the cut glass portion opposite to the second opening 42 is naturally cooled, the other glass lathe stops rotating and is removed from the glass lathe three-jaw clamp.

[0048] The steps of integrating the inner core prototype 33 and the outer shell prototype 43 are as follows: first, the inner core prototype 33 and the outer shell prototype 43 are fixed to the two ends of the glass lathe respectively, and the first opening 32 is directed toward the second opening 42, and then the glass lathe is driven to move the inner core prototype 33, so that the first opening 32 extends from the second opening 42 into the second cylinder 41, and the first cylinder 31 passes through the second cylinder 41 (such as Figure 6 As shown), the first opening 32 extends out of the second cylinder 41 by a distance of 0.5-1 cm.

[0049] The steps of burning the glass neck 50 are as follows: first, a flame gun is used to burn a connection hole 44 with a diameter of 12 mm on the outer surface of the curved surface of the second cylinder 41 with a sharp flame of 1300°C, and then a flame gun is used to burn the pre-fired glass neck 50 to the connection hole 44 with a flame of 1200°C (such as Figure 7 Then use a flame gun with a 1300°C flame to perform fine welding on the burned joint.

[0050] The steps for fixing the inner core prototype 33 and the outer shell prototype 43 are as follows: Figure 7 As shown, another connecting glass tube 60 is then taken, one end of the connecting glass tube 60 is burned to the glass neck 50 with a flame of 1200°C, and then the connecting glass tube 60 is softened using a flame temperature of 1000°C, and the other end is burned to the glass tube other than the first cylinder 31 on the inner core prototype 33 under a flame of 1200°C, and then a flame of 1300°C is used to perform fine welding on the burned position, and then the connecting glass tube 60 is cooled to relatively fix the relative positions of the outer shell prototype 43 and the inner core prototype 33.

[0051] The first opening 32 and the third opening 45 sealing step: After that, the outer shell prototype 43 and the inner core prototype 33 connected as one are rotated on the glass lathe at a speed of 30r / min around the first axis, and then a flame gun is held and burned at 1500°C at the center of the side of the second expansion pipe section 40 away from the second opening 42 to form a circular third opening 45 with a diameter of 6cm. Figure 8 As shown in FIG. 1 , the first opening 32 is extended out of the third opening 45, and then the glass lathe is driven to move the cut second expansion pipe section 40 arranged opposite to the third opening 45 to the side away from the third opening 45. After the cut portion is cooled, it is removed from the glass lathe. Then, a flame gun is used to seal the first opening 32 and the third opening 45 with a flame of 1200°C (as shown in FIG. 1 ). Fig. 9 As shown), then use the 1200℃ flame of the glass lathe's torch to heat the remaining glass components on the glass lathe as a whole, and reduce the flame temperature at a rate of 150℃ / min until the flame is not enough to cover the entire glass component, then the glass lathe torch can be extinguished.

[0052] Preparation steps of glass gas chamber prototype 80: Then use a flame gun with a flame of 1300°C to burn off the sintered portion connecting the glass tube 60 and the inner core prototype 33. Then remove the glass device including the second cylinder 41 and the first cylinder 31 from the glass lathe, and use a stainless steel knife to cut off the sintered portion connecting the glass tube 60 and the glass neck 50, and then remove the connecting glass tube 60 from the glass device. Fig.10The first solid glass rod 71 of the support member 70 shown is inserted into the three-claw clamp at one end of the glass lathe and fixed, and the end of the inner core blank 33 away from the second cylinder 41 is fixed on the three-claw clamp at the other end of the glass lathe, and one end of the first hollow glass tube 72 of the support member 70 is connected to the air inlet of the glass lathe, and a flame gun is held to sinter the other end of the first hollow glass tube 72 with the glass neck 50 using a flame of 1200°C, and then fine welding is performed using a flame of 1300°C. Then the glass lathe is driven to rotate the support member 70 and the glass device connected as one at a speed of 30r / min, and then a flame gun is held to use a bright blue sharp oxygen-rich flame of 1500°C to cut off the inner core blank 33 except for the first cylinder 31 (as shown in FIG. Fig.11 As shown), a first cylinder 31 with a fourth opening 34 is obtained, and the glass lathe is driven to drive the cut portion to move toward the end away from the first cylinder 31, and then a flame gun is held and a flame of 1200°C is used to seal the second opening 42 and the fourth opening 34, and then the 1200°C flame of the glass lathe torch is used to heat the entire remaining glass device on the glass lathe, and the flame temperature is uniformly reduced at a rate of 150°C / min until the flame is insufficient to cover the entire glass device, and the glass lathe torch can be extinguished, and then the glass lathe is driven to stop rotating, and then the support member 70 and the glass device are removed from the glass lathe as a whole, and then a stainless steel cutter is used to cut off the first hollow glass tube 72 of the support member 70 and the glass neck 50 at the sintering point, so as to obtain a circular glass gas chamber prototype 80, please refer to Fig.12 .

[0053] Preparation steps of glass gas chamber 90: first use a handheld flame gun to use a 1200°C flame to burn a hollow glass tube at one end of the glass neck 50, then use a 1300°C flame to perform fine welding on the burned part, and then insert the other end of the hollow glass tube into the air inlet of the glass lathe, fix it with a three-claw pliers, and then use the three-claw pliers at the other end of the glass lathe to clamp the other end of the circular glass gas chamber prototype 80 opposite to the glass neck 50. Then, the glass lathe is driven to rotate the annular glass chamber 90 at a speed of 30 r / min, and a flame of 1400°C is used to soften a position at a diameter of the annular glass chamber prototype 80 (the diameter divides the annular glass chamber prototype 80 into two halves and is perpendicular to the axial direction of the glass neck 50), and the glass lathe is driven to slowly move the half of the glass chamber prototype 80 where the glass neck 50 is not set, so that the two halves of the glass chamber prototype 80 move away from each other, so that the softened position gradually shrinks and closes (please refer to Fig.13), and is pulled apart to form two completely separated halves of the glass chamber prototype 80. During this period, it is necessary to continuously ventilate the glass chamber prototype 80 through the air inlet of the glass lathe to keep the morphology and wall thickness of the broken surface of the pulled apart part uniform. After the pulling is completed, the semi-circular glass chamber prototype 80 with the glass neck 50 is heated using a 1400°C flame of the glass lathe torch, and the flame temperature is uniformly reduced at a rate of 150°C / min until the flame is insufficient to cover the entire semi-circular glass chamber prototype 80, and the glass lathe torch can be extinguished, and the glass chamber 90 is completed (such as Fig.14 The glass gas cell 90 has an outer diameter of 100 mm, an inner diameter of 50 mm, a horizontal coverage scattering angle of 180°, a height of 50 mm, and an average side wall thickness of 4 mm.

[0054] The preparation method of this embodiment is simple and economical.

[0055] Example 2

[0056] This embodiment provides a glass gas chamber 90, which is prepared by the preparation method in Embodiment 1. Fig.14 The glass gas chamber 90 includes a main body 91 and a glass neck 50 .

[0057] Please refer to Fig.14 The main body 91 is in the shape of a semicircular ring. The outer surface of the main body 91 away from the center of the semicircular ring has a connecting hole 44. The main body 91 is used to store alkali metals and 3 He gas. The glass neck 50 is a hollow structure with openings at both ends, and the opening at one end of the glass neck 50 is connected to the connecting hole 44. The connecting hole 44 is located in the middle of the outer surface of the main body 91 away from the ring center. The inner diameter of the middle position of the glass neck 50 is smaller than the inner diameter of the two end positions of the glass neck 50.

[0058] The glass gas chamber 90 of this embodiment can withstand a high pressure of 3.5 bar and can be applied to scientific research experiments of neutrons with a large divergence angle of up to 180°.

[0059] Example 3

[0060] In neutron polarization 3 When He gas is used, the glass gas chamber 90 in Example 2 is used to store alkali metals and 3 He gas.

[0061] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for preparing a glass gas chamber, characterized in that: include: The steps of preparing the inner core prototype and the outer shell prototype are as follows: fixing a hollow glass tube on a processing device, softening, expanding and flattening a part of the glass tube so that the diameter of the softened part increases, and obtaining a first expansion tube section having a first cylinder; using the same method to prepare a second expansion tube section having a second cylinder, the difference being that the diameter of the second cylinder is larger than the diameter of the first cylinder, and the height of the second cylinder is smaller than the height of the first cylinder; then cutting radially at one end of the curved surface of the first cylinder to obtain an inner core prototype having a first opening; and cutting a circular second opening at the center of the side surface of the second expansion tube section located on one side of the second cylinder to obtain an outer shell prototype; The glass gas chamber prototype preparation steps are as follows: firstly, the inner core prototype and the outer shell prototype are fixed at two ends of the processing device respectively, and the first opening is directed toward the second opening, and then the processing device is driven to make the first opening extend from the second opening into the second cylinder, and the first cylinder penetrates the second cylinder; then, a glass neck is sintered on the outer surface of the curved surface of the second cylinder; then, a circular third opening is cut out at the center of the side surface of the second expansion tube section away from the second opening, so that the first opening extends out of the third opening, and the first opening and the third opening are sealed; Then, the second cylinder is fixed to one end of the processing device, the inner core prototype is cut off to remove the part of the first cylinder, and the first cylinder with the fourth opening is obtained; the second opening and the fourth opening are sealed to obtain a circular ring-shaped glass air chamber prototype; The steps for preparing the glass gas chamber are as follows: first, the glass gas chamber prototype is fixed on the processing device, and air is ventilated into the glass gas chamber prototype from the glass neck, then the position of the single diameter of the glass gas chamber prototype is softened, and the processing device is driven to move the glass gas chamber prototype on both sides of the diameter away from each other until the softened part shrinks and closes, separating into two independent halves, and the preparation of the glass gas chamber is completed.

2. The preparation method according to claim 1, characterized in that In the steps of preparing the inner core prototype and the outer shell prototype, in the first expansion tube section, the outer diameter of the first cylinder is 5.8 cm, the height in the axial direction is 7-8 cm, and the wall thickness is 4 mm; in the second expansion tube section, the outer diameter of the second cylinder is 10 cm, the height in the axial direction is 3-4 cm, and the wall thickness is 4 mm; Alternatively, the diameters of the second opening and the fourth opening are 6 cm.

3. The preparation method according to claim 1, characterized in that: In the glass gas chamber prototype preparation step, after sealing the first opening and the third opening, the second cylinder is fixed to one end of the processing device by a support, and then the rotation function of the processing device is started, and the support drives the first cylinder and the second cylinder to rotate axially, and then the inner core prototype is cut off to remove the part of the first cylinder, so as to obtain a first cylinder with a fourth opening; wherein, the support has a fixed glass tube, and the fixed glass tube is a hollow structure with openings at both ends, wherein the opening at one end is burnt to the glass neck, and the other end is fixed to the processing device.

4. The preparation method according to claim 1, characterized in that: In the glass gas chamber prototype preparation step, after the glass neck is sintered to the outer surface of the second cylindrical curved surface, one end of a connecting glass tube is sintered to the glass neck, and then the connecting glass tube is softened and the other end is sintered to the glass tube on the inner core prototype except the first cylinder, and then the connecting glass tube is cooled to relatively fix the relative positions of the outer shell prototype and the inner core prototype.

5. The preparation method according to claim 1, characterized in that: In the inner core prototype and outer shell prototype preparation step, a second circular opening is burned out at the center of the side surface of the second expansion pipe section located on one side of the second cylinder using a flame temperature of 1500° C. to obtain an outer shell prototype; And / or, in the glass gas chamber prototype preparation step, a circular third opening is burned out at the center of the side surface of the second expansion tube section away from the second opening using a flame temperature of 1500°C.

6. The preparation method according to claim 1, characterized in that: Before the steps of preparing the inner core prototype and the outer shell prototype, a cleaning step is also included, and the cleaning step includes: using hydroxyethylidene diphosphonic acid to clean the hollow glass tube.

7. A glass gas chamber, characterized in that: The product is prepared by the preparation method described in claims 1 to 6.

8. The glass gas chamber according to claim 7, characterized in that: include: The main body is in the shape of a semicircle, and the outer surface of the main body away from the center of the semicircle has a connecting hole; the main body is used to store alkali metals and 3 He gas; The glass neck is a hollow structure with openings at both ends, and the opening at one end of the glass neck is connected to the connecting hole.

9. The glass gas chamber according to claim 8, characterized in that: The connecting hole is located at the middle position of the outer surface of the main body away from the ring center; Alternatively, the inner diameter of the middle position of the glass neck is smaller than the inner diameters of the two end positions of the glass neck.

10. A glass gas chamber in neutron polarization 3 Application in He gas, characterized in that, The glass gas chamber is prepared by the preparation method described in any one of Rights 1-6; or, the glass gas chamber is the glass gas chamber described in any one of Rights 7-9.

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