He position sensitive detector and assembling method thereof

Abstract

The invention discloses a He position sensitive detector and an assembling method thereof, and relates to the technical field of nuclear detection. The detector comprises a tube shell filled with working gas, wherein insulating electrodes consisting of kovar alloy end sockets, insulating ceramics and copper tubes are arranged at two ends of the tube shell. And the two ends of the anode wire coaxially arranged in the tube shell are respectively connected with the inflating tube and the wire penetrating copper needle through an anode wire positioning piece and a spring. According to the invention, high-precision coaxial positioning of the anode wire is realized through small clearance fit between the anode wire positioning piece and the inner wall of the copper pipe; a bilateral spring structure and a unique assembly method are adopted, so that accurate control and reliable maintenance of the tension of the anode wire are ensured; and an inflation tube and a threading copper needle are multiplexed as a signal extraction electrode, so that the functions of inflation, signal extraction and mechanical support are efficiently integrated in a limited space. The problems that an existing detector anode wire is not accurate in positioning, tension maintaining is not reliable, and multifunctional integration is difficult in a compact space are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear detection, and in particular to a 3He position sensitive detector and an assembling method thereof. BACKGROUND

[0002] In scientific devices such as neutron scattering systems, 3He position sensitive detectors are favored as core detection elements due to their high detection efficiency for low-energy neutrons through the 3He(n, p) 3H reaction. The basic working principle of such detectors relies on the slender anode wire arranged axially inside the detector; when neutrons react with the high-voltage 3He working gas inside the detector, the event position information can be obtained by measuring the difference in signal pulse amplitude between the two ends of the anode wire. To achieve superior one-dimensional position resolution, the anode wire of the detector is usually made of nickel-chromium alloy wire with an extremely small diameter (such as less than 15 μm), and needs to maintain precise axial alignment (usually requiring a radial deviation of no more than 0.5 mm) and constant tension over a span of tens of centimeters.

[0003] However, there is an inherent contradiction in the physical structure of such detectors: to improve position resolution, the detector tube diameter is designed to be very small, which results in extremely limited space at both ends. In this limited space, multiple key requirements need to be addressed: first, reliable filling and sealing of the working gas (usually several to dozens of atmospheres of 3He mixed gas) must be achieved; second, a precise signal extraction structure needs to be designed to extract the electrical signal on the anode wire; third, it is also necessary to ensure that the anode wire is always in a state of moderate tension and high alignment with the tube axis during assembly and operation, which usually requires the use of low elastic coefficient springs and corresponding support positioning mechanisms.

[0004] In the prior art, through reverse engineering analysis of typical products on the market, it is found that the existing scheme has deficiencies in achieving high-precision positioning of the anode wire, which may cause large radial deviation of the anode wire in the detector, thereby affecting the position resolution; at the same time, the reliability of the spring tensioning mechanism and the stability against airflow impact during high-pressure filling also need to be improved. In addition, in the extremely limited end space, how to coordinate the arrangement of the filling channel and the electrical insulation extraction structure, and make them compatible with the precise tensioning and positioning mechanism of the anode wire, is a long-standing technical difficulty.

[0005] Therefore, there is an urgent need for a new 3He position sensitive detector end structure design scheme that can effectively integrate the functions of filling, signal extraction, anode wire support positioning and tensioning in a compact space, and has the advantages of convenient assembly, high alignment accuracy, strong anti-interference ability, etc., to improve the overall performance and manufacturing reliability of the detector. SUMMARY

[0006] The first object of the present application is to provide a 3He position sensitive detector, which integrates the functions of inflation, signal extraction, anode wire support and tensioning in one structure, and can realize high-precision centering and stable tensioning of the anode wire under the premise of ensuring the inflation of the working gas and the extraction of the signal.

[0007] The second object of the present application is to provide an assembly method of the above-mentioned 3He position sensitive detector, which aims to solve the problems of easy breakage of the thin anode wire, difficult control of the tension and difficult guarantee of the positioning accuracy in the assembly process through a series of accurately controllable steps, especially the calculation of the length of the anode wire and the accurate control of the spring tension.

[0008] The technical solution for solving the first technical problem of the present application is: a 3He position sensitive detector, comprising a tube shell internally filled with a working gas, both ends of the tube shell being provided with an insulating electrode, and a coaxial anode wire being arranged in the tube shell, the insulating electrode comprising, from the outside to the inside, a Kovar alloy sealing head, an insulating ceramic and a copper tube arranged in sequence, one of the insulating electrodes being a gas filling end, and a gas filling tube being inserted into the copper tube inside the gas filling end, the other insulating electrode being a wire passing end, and a wire passing copper needle being inserted into the copper tube inside the wire passing end; The end of the gas filling tube and the end of the wire passing copper needle located in the copper tube are connected with springs through spring fixing members, the other ends of the two springs are connected with the end of the anode wire through anode wire positioning members, and an air inlet hole is formed in the tube wall of the gas filling tube.

[0009] As a further improvement of the present application, the Kovar alloy sealing head is provided with an embedding part for embedding the tube shell and a limiting part a for limiting the embedding depth.

[0010] As a further improvement of the present application, the gas filling tube is provided with a limiting part b for limiting the insertion depth of the gas filling tube into the copper tube.

[0011] As a further improvement of the present application, the end of the gas filling tube is provided with a crimping socket b for inserting and extruding the spring fixing member, the end of the wire passing copper needle is provided with a crimping socket a for inserting and extruding the spring fixing member, and the spring fixing member is provided with a thin slot for clamping the end of the spring.

[0012] As a further improvement of the present application, the anode wire positioning member is provided with a thin slot for accommodating the end of the spring and the end of the anode wire, and the anode wire positioning member is fixedly connected with the end of the spring and the end of the anode wire through extrusion.

[0013] As a further improvement of the present application, the outer diameter of the anode wire positioning member is 0.2-0.4 mm smaller than the inner diameter of the copper tube of the insulating electrode.

[0014] As a further improvement of the present application, the wire passing copper needle is provided with a positioning part.

[0015] As a further improvement of the present application, the free end of the inflation tube is connected with a VCR joint.

[0016] The technical scheme for solving the second technical problem of the present application is: a mounting method of a 3He position sensitive detector, comprising the following steps: S1: inserting a spring fixing member into a crimping socket b of the inflation tube, and putting one end of a spring into the center of a slit of the spring fixing member, and realizing fixed connection of the three by extrusion; S2: inserting another spring fixing member into a crimping socket a of the wire-through copper needle, and putting one end of another spring into the center of a slit of the spring fixing member, and realizing fixed connection of the three by extrusion; S3: putting the one end of the anode wire and the other end of the spring connected with the inflation tube together into the center of a slit of an anode wire positioning member, and realizing fixed connection of the three by extrusion; S4: calculating the length of the anode wire, so that the distance between the positioning part of the wire-through copper needle and the limiting part b of the inflation tube is equal to the distance between the top ends of the two end insulating electrodes after assembly; S5: cutting the anode wire to the calculated length, and putting the other end of the anode wire and the other end of the spring connected with the wire-through copper needle together into the center of a slit of another anode wire positioning member, and realizing fixed connection of the three by extrusion; S6: guiding the assembled component through an insulating electrode and a tube shell in sequence by using the wire-through copper needle; S7: inserting the insulating electrode into the tube shell to the limiting part a thereof, and preliminarily fixing; S8: inserting the inflation tube into the copper tube of the fixed insulating electrode to the limiting part b thereof; S9: passing the wire-through copper needle through another insulating electrode; then inserting the insulating electrode into the tube shell to the limiting part a thereof, and preliminarily fixing; S10: welding the gap between the limiting part b of the inflation tube and the copper tube of the insulating electrode; S11: pulling out the wire-through copper needle until the spring connected with the wire-through copper needle is stretched, and then allowing the wire-through copper needle to be freely pulled back by the spring, and recording the position of the positioning part of the wire-through copper needle after being freely pulled back; S12: calculating the total length of the stretched springs at the two ends of the 3He position sensitive detector, and then pulling out the wire-through copper needle by the length, and then welding the gap between the wire-through copper needle and the copper tube of the insulating electrode, and cutting the excess part of the wire-through copper needle; S13: welding the gap between the two end insulating electrodes and the tube shell; S14: after inflation, welding and cutting the excess part of the inflation tube by using extrusion welding, and completing the production of the detector; S15: The remaining gas-filled tube and the wire-through copper needle on the detector are used as signal output electrodes at both ends of the detector.

[0017] As a further improvement of the present application, in step S12, the total length of the stretching of the two-end spring is determined according to the tension control requirement of the anode wire.

[0018] Advantages Compared with the prior art, the advantages of the present application, a 3He position sensitive detector and its assembly method, are as follows: 1. High-precision positioning and reliable tensioning of the anode wire are achieved: by designing an anode wire positioning member with an outer diameter precisely matched with the inner diameter of the copper tube, the radial movement of the anode wire assembly is effectively limited, ensuring that the deviation of the anode wire from the axis of the detector tube is controlled within a very small range (e.g., less than 0.2 mm). At the same time, the use of bilaterally symmetrical spring arrangement combined with the precise calculation of the stretching step provides a constant and reliable tension for the slender anode wire, preventing it from relaxing or breaking; 2. Optimization of functional integration in limited space: the present application creatively reuses the gas-filled tube and the wire-through copper needle as signal output electrodes, and uses the internal channel to accommodate the spring tensioning mechanism. This "one body with multiple functions" design greatly saves the valuable space at both ends of the detector, and simultaneously meets the four core requirements of high-pressure gas filling, signal output, anode wire coaxial positioning and tension maintenance, and mechanical support in an extremely compact structure; 3. Improved assembly feasibility and reliability: the entire assembly process uses "extrusion fixation" instead of traditional micro-assembly welding, overcoming the problems of difficult operation in a small space and damaged parts, simplifying the process, and improving the assembly success rate and consistency. The design of the spring fixing member can also block the airflow during inflation, avoiding the direct impact of high-pressure gas on the anode wire positioning member and the spring, protecting the spring with extremely small elastic coefficient from damage; 4. Ensuring the stability of the detector performance: precise mechanical positioning ensures excellent position resolution; reliable tensioning mechanism ensures the stability of the detector signal throughout its life cycle; compact and robust structural design can withstand the high pressure of the working gas. These factors work together to significantly improve the overall performance and service life of the 3He position sensitive detector.

[0019] The present application will become more apparent from the following description in conjunction with the accompanying drawings, which are used to explain embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings belong to the protection scope of the present application.

[0021] Figure 1 is a perspective view of the present application; Figure 2 is a schematic view of the internal structure of the present application; Figure 3 is a perspective view of the insulating electrode of the present application; Figure 4 is a schematic view of the internal structure of the insulating electrode of the present application; Figure 5 is a schematic view of the mounting structure of the insulating electrode and the inflation tube of the present application; Figure 6 is a schematic view of the mounting structure of the insulating electrode and the wire-through copper needle of the present application.

[0022] Wherein: 1-tube shell; 2-anode wire; 3-insulating electrode: 31-kovar alloy sealing head; 311-embedded part; 312-limiting part a; 32-insulating ceramic; 33-copper tube; 4-wire-through copper needle; 41-pressing socket a; 42-positioning part; 5-inflation tube; 51-air inlet hole; 52-pressing socket b; 53-limiting part b; 6-spring fixing part; 7-anode wire positioning part; 8-spring. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; of course, it can also be mechanical connection, or electrical connection; in addition, it can also be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The embodiments of the present application will now be described with reference to the drawings.

[0026] Embodiment The detailed description of the present application is shown as Figures 1-6 a highly integrated and precise end structure design.

[0027] The detector comprises an elongated cylindrical tube 1 filled with several to several tens of atmospheres of 3He working gas. Each end of the tube 1 is equipped with an insulating electrode 3. Each insulating electrode 3 adopts a three-layer sleeve structure: the outermost layer is a Kovar alloy head 31 capable of vacuum sealing connection with the tube 1, the middle layer is an insulating ceramic 32 providing high voltage insulation, and the innermost layer is a copper tube 33 serving as an electrical connection and mechanical guide channel. The Kovar alloy head 31 is provided with an embedding part 311 for embedding the tube 1 and a limiting part a 312 for limiting the embedding depth, ensuring that the insulating electrode 3 can be embedded in the end of the tube 1 with a micro-gap, and making the axis of the copper tube 33 highly coincide with the axis of the tube 1.

[0028] The insulating electrode 3 at one end of the detector is defined as the gas filling end, and a gas filling tube 5 is inserted into the copper tube 33 of the insulating electrode 3. The gas filling tube 5 is provided with a limiting part b 53 for controlling the depth of insertion into the copper tube 33. The side wall of the gas filling tube 5 located in the copper tube 33 is provided with a gas inlet hole 51, and the free end of the gas filling tube 5 can be connected to a standard VCR joint for connection with a gas filling system. The insulating electrode 3 at the other end of the detector is defined as the wire passing end, and a wire passing copper needle 4 is inserted into the copper tube 33 of the insulating electrode 3. The wire passing copper needle 4 is provided with a positioning part 42.

[0029] In this embodiment, the end of the gas filling tube 5 located in the copper tube 33 is provided with a crimping socket b 52, and the end of the wire passing copper needle 4 located in the copper tube 33 is provided with a crimping socket a 41. Two spring fixing parts 6 are inserted into the crimping socket a 41 of the wire passing copper needle 4 and the crimping socket b 52 of the gas filling tube 5, and are firmly fixed by extrusion. The spring fixing parts 6 are each provided with a thin slit for clamping one end of a spring 8. The other end of the two springs 8 is connected to the two ends of a thin anode wire 2 through an anode wire positioning part 7. Specifically, the anode wire positioning part 7 is also provided with a thin slit, and the end of the anode wire 2 and the end of the spring 8 are jointly placed in the thin slit and are reliably fixed and connected by extrusion.

[0030] To achieve high-precision coaxial positioning, the key design of this embodiment is that the outer diameter of the anode wire positioning part 7 is 0.2-0.4 mm smaller than the inner diameter of the copper tube 33 of the insulating electrode 3. This size design ensures that the anode wire positioning part 7 can freely slide in the copper tube 33 for assembly and tension adjustment, while strictly limiting its radial movement range to within 0.2 mm, thereby ensuring the centering accuracy of the fixed anode wire 2 and the axis of the tube 1.

[0031] The technical effects and implementation principles of this He³ position-sensitive detector are detailed below: The principle behind achieving high-precision positioning: The anode wire positioning components 7 serve as the radial positioning reference for the anode wire 2, forming a tight "moving barrier" between them and the inner wall of the high-precision machined copper tube 33. Due to the extremely small gap—only 0.2mm-0.4mm—the maximum possible radial offset of the entire anode wire assembly is limited within this gap range, thereby mechanically ensuring the high coaxiality of the anode wire 2. This is the physical basis for achieving excellent position resolution.

[0032] The principle of optimized functional integration: The inflation tube 5 and the wire-threading copper needle 4 are endowed with multiple functions. First, they serve as channels for high-pressure gas (inflation tube 5) and assembly guides (wire-threading copper needle 4); second, they internally house and support the spring tensioning mechanism; third, after inflation and assembly are completed, they are used as electrodes for outputting electrical signals. This "one-piece, multi-purpose" design concept avoids the complexity and spatial conflicts of setting up independent pipes and electrodes separately in the limited end space, achieving a highly compact structure.

[0033] The principle behind improved reliability is as follows: First, "extrusion fixing" replaces micro-welding, avoiding damage to small parts such as spring 8 and anode wire 2 from the heat-affected zone. This simplifies the process and increases connection reliability. Second, the spring fixing component 6, located at the end of the inflation tube 5, forms a physical shield. During inflation, the high-pressure airflow entering from the air inlet 51 must first pass through the blocking and diffusion of the spring fixing component 6, preventing it from directly impacting the anode wire positioning component 7 and spring 8. This effectively prevents spring 8 from overload deformation or failure due to instantaneous airflow impact.

[0034] The core of the assembly method for the ³He position sensitive detector lies in achieving precise positioning and tension control of the anode wire 2 through precisely controlled steps.

[0035] Steps S1 to S5: Pre-assembly of internal components and length setting of anode wire: S1: Insert a spring retainer 6 into the crimping socket b52 of the inflation tube 5, and place one end of a spring 8 into the center of the slit of the spring retainer 6, and achieve a fixed connection of the three by compression. S2: Insert another spring retainer 6 into the crimping socket a41 of the wire-threading copper needle 4, and put one end of another spring 8 into the center of the slit of the spring retainer 6, and achieve a fixed connection of the three by compression. S3: Place one end of the anode wire 2 and the other end of the spring 8 connected to the air tube 5 into the center of the slit of an anode wire positioning piece 7, and fix the three together by squeezing. Key step S4: Accurately calculate the required length of the anode wire 2. The goal of this length calculation is that when both springs 8 are in a free state—that is, unstretched—the distance between the positioning part 42 of the wire-threading copper needle 4 and the limiting part b53 of the air-filling tube 5 is exactly equal to the theoretical distance between the top ends of the copper tubes 33 of the insulating electrodes 3 at both ends after the detector is fully assembled. S5: Cut the anode wire 2 to the calculated length, and insert its other end and the other end of the spring 8 connected to the wire-threading copper needle 4 into the center of the slit of another anode wire positioning component 7. Secure the three together by compression. This step ensures that the geometry of the entire internal assembly in the relaxed state matches the final detector housing size, laying the foundation for applying precise tension subsequently.

[0036] Steps S6 to S10: Housing assembly and initial fixation: S6: Using the wire-threading copper needle 4 as a guide rod, the pre-assembled internal components—anode wire 2, spring 8, and anode wire positioning component 7—are sequentially passed through an insulating electrode 3 and a tube shell 1; S7: Insert the insulating electrode 3 into the tube shell 1 until the limiting part a312 of the insulating electrode 3, and initially fix the insulating electrode 3 and the tube shell 1. S8: Insert the inflation tube 5 into the copper tube 33 with the fixed insulating electrode 3 until the limiting part b53 of the inflation tube 5 is reached. S9: Pass the wire-threading copper needle 4 through the tube shell 1 through another insulating electrode 3, and insert the insulating electrode 3 into the tube shell 1 until the limiting part a312 of the insulating electrode 3, so as to initially fix the connection between the insulating electrode 3 and the tube shell 1. S10: Weld the gap between the limiting part b53 of the air inflator 5 and the copper tube 33 of the insulating electrode 3, and fix the air inflator end first.

[0037] Steps S11 to S13: Precise control of anode wire tension and final sealing: This is the essence of the entire assembly method. Step S11: Gently pull out the wire-threading copper needle 4, stretching the spring 8 connected to it, then release it to allow the wire-threading copper needle 4 to spring back freely, and record the stable position of its positioning part 42. This position is the natural equilibrium point of the spring system without external constraints, serving as the benchmark for tension calculation; Step S12: First, based on the ideal tension value required for the material and diameter of the anode wire 2, calculate the total stretching length required for the springs 8 at both ends to jointly provide this tension; then, pull the wire-threading copper needle 4 from the reference position to the calculated length, and immediately weld it to the copper tube 33 in this state; then, cut off the excess part of the wire-threading copper needle 4. This method transforms the anode wire tension, which is difficult to measure directly, into the spring stretching amount that can be precisely controlled by geometric dimensions, thus achieving quantitative and repeatable precise control of tension.

[0038] Finally, step S13: weld all the joints between the insulating electrodes 3 and the shell 1 to complete the vacuum sealing of the detector.

[0039] Steps S14 to S15: Inflation and signal extraction: S14: After filling the detector with working gas at a predetermined pressure through the inflation tube 5, the inflation tube 5 is sealed by extrusion welding and the excess part is cut off to complete the detector manufacturing. S15: The ends of the remaining air tube 5 and the wire-threading copper needle 4 naturally become signal lead-out electrodes for connecting to the external readout circuit.

[0040] The technical effects and implementation principles of the assembly method for this He position-sensitive detector are as follows: The principle behind solving the tension control problem: Traditional methods rely on workers' experience and feel to estimate tension, resulting in poor repeatability and a high risk of wire breakage. This invention transforms the subjective process of tension control into an objective step based on physical calculations through a "baseline positioning + quantitative stretching" method: F = k·Δx. As long as the spring constant k is accurate and the stretching amount Δx is precise, stable and consistent tension in the anode wire 2 can be obtained, fundamentally solving the tension control problem and significantly reducing assembly risks.

[0041] The principle behind ensuring positioning accuracy: Throughout the assembly process, the anode wire assembly moves and is positioned within the precision copper tube 33 via the anode wire positioning element 7, with its radial movement strictly limited. This ensures that even during complex wire threading and stretching operations, the center position of the anode wire 2 remains within a high precision range, guaranteeing the consistency of the final product's performance.

[0042] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A3He position sensitive detector comprising a tube (1) internally filled with a working gas, said tube (1) being provided with an insulating electrode (3) at both ends and a coaxial anode wire (2) inside the tube (1), characterized in that, The insulating electrode (3) comprises, from outside to inside, a Kovar seal head (31), insulating ceramic (32) and copper pipe (33) arranged in sequence, one of the insulating electrodes (3) is an inflation end, and a copper pipe (33) inside the inflation end is inserted with an inflation pipe (5), the other insulating electrode (3) is a wire threading end, and a copper pipe (33) inside the wire threading end is inserted with a wire threading copper needle (4); The end of the inflation pipe (5) and the end of the wire threading copper needle (4) inside the copper pipe (33) are connected with springs (8) through spring fixing members (6), the other ends of the two springs (8) are connected with the ends of the anode wire (2) through anode wire positioning members (7), and an air inlet hole (51) is formed in the wall of the inflation pipe (5).

2. The 3He position sensitive detector of claim 1, wherein, The Kovar seal head (31) is provided with an embedding part (311) for embedding the tube shell (1) and a limiting part a (312) for limiting the embedding depth.

3. The 3He position sensitive detector of claim 1, wherein, The inflation pipe (5) is provided with a limiting part b (53) for limiting the insertion depth of the inflation pipe (5) into the copper pipe (33).

4. The 3He position sensitive detector of claim 1, wherein, The end of the inflation pipe (5) is provided with a crimping socket b (52) for inserting and extruding the spring fixing member (6), the end of the wire threading copper needle (4) is provided with a crimping socket a (41) for inserting and extruding the spring fixing member (6), and the spring fixing member (6) is provided with a thin slot for clamping the end of the spring (8).

5. The 3He position sensitive detector according to claim 1 or 4, characterized in that The anode wire positioning member (7) is provided with a thin slot for accommodating the end of the spring (8) and the end of the anode wire (2), and the anode wire positioning member (7) is fixedly connected with the end of the spring (8) and the end of the anode wire (2) through extrusion.

6. The 3He position sensitive detector of claim 1, wherein, The outer diameter of the anode wire positioning member (7) is 0.2-0.4mm smaller than the inner diameter of the copper pipe (33) of the insulating electrode (3).

7. The 3He position sensitive detector of claim 1, wherein, The wire threading copper needle (4) is provided with a positioning part (42).

8. The 3He position sensitive detector of claim 1, wherein, The free end of the inflation pipe (5) is connected with a VCR joint.

9. A method of assembling a3He position sensitive detector according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1: inserting one spring fixing member (6) into the crimping socket b (52) of the inflation pipe (5), and placing one end of one spring (8) into the center of the thin slot of the spring fixing member (6), and realizing the fixed connection of the three through extrusion; S2: inserting another spring fixing member (6) into the crimping socket a (41) of the wire threading copper needle (4), and placing one end of another spring (8) into the center of the thin slot of the spring fixing member (6), and realizing the fixed connection of the three through extrusion; S3: placing the end of the anode wire (2) and the other end of the spring (8) connected with the inflation pipe (5) into the center of the thin slot of one anode wire positioning member (7), and realizing the fixed connection of the three through extrusion; S4: calculating the length of the anode wire (2), so that the distance between the positioning part (42) of the wire threading copper needle (4) and the limiting part b (53) of the inflation pipe (5) in the state of no force is equal to the distance between the top ends of the copper pipes (33) of the two end insulating electrodes (3) after assembly; S5: cutting the anode wire (2) according to the calculated length, and placing the other end of the anode wire (2) and the other end of the spring (8) connected with the wire threading copper needle (4) into the center of the thin slot of another anode wire positioning member (7), and realizing the fixed connection of the three through extrusion; S6: the assembled component is guided by the wire-through copper needle (4) to pass through an insulating electrode (3) and a tube shell (1) in sequence; S7: the insulating electrode (3) is inserted into the tube shell (1) to its limiting part a (312) and is preliminarily fixed; S8: the inflation tube (5) is inserted into the copper tube (33) of the fixed insulating electrode (3) to its limiting part b (53); S9: the wire-through copper needle (4) passing through the tube shell (1) passes through another insulating electrode (3); the insulating electrode (3) is inserted into the tube shell (1) to its limiting part a (312) and is preliminarily fixed; S10: the gap between the limiting part b (53) of the inflation tube (5) and the copper tube (33) of the insulating electrode (3) is welded; S11: the wire-through copper needle (4) is pulled out until the spring (8) connected to it is stretched, and then the wire-through copper needle (4) is freely pulled back by the spring (8), and the position of the positioning part (42) after being freely pulled back is recorded; S12: the total length of the stretched spring (8) at both ends of the 3He position sensitive detector is calculated, and then the wire-through copper needle (4) is pulled out by the length of the total length, and then the gap between the wire-through copper needle (4) and the copper tube (33) of the insulating electrode (3) is welded, and the excess part of the wire-through copper needle (4) is cut off; S13: the gap between the two end insulating electrodes (3) and the tube shell (1) is welded; S14: after inflation, the inflation tube (5) is welded by extrusion sealing and the excess part is cut off, and the detector is completed; S15: the remaining inflation tube (5) and wire-through copper needle (4) on the detector are used as signal lead-out electrodes at both ends of the detector.

10. The method of assembling a 3He position sensitive detector according to claim 9, wherein, In step S12, the total length of the stretched spring (8) is determined according to the tension control requirement of the anode wire (2).

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