A method for simultaneous indium encapsulation of multiple electrodes in a laser gyroscope

Abstract

This invention discloses a method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, comprising: pre-assembling three electrodes onto a gyroscope cavity using a pre-assembly fixture; wherein the three electrodes are a cathode electrode, a first anode electrode, and a second anode electrode; and indium sealing the three electrodes pre-assembled on the gyroscope cavity using an indium sealing fixture. The method for simultaneous indium sealing of multiple electrodes in a laser gyroscope according to this invention can achieve simultaneous indium sealing of three electrodes, saving manpower and resources while maintaining indium sealing quality at the same level, and reducing processing time to one-third of the original time.

Description

Technical Field

[0001] This invention belongs to the field of indium encapsulation technology for laser gyroscope electrodes, and particularly relates to a method for simultaneous indium encapsulation of multiple electrodes in a laser gyroscope. Background Technology

[0002] A laser gyroscope is an instrument that can autonomously sense the yaw angle and position of a moving object without relying on external information or radiating energy to the outside. It is a core sensitive device in an inertial navigation system.

[0003] A laser gyroscope is an optical gyroscope based on the Sagnac effect. Essentially, it's a ring laser, with a resonant cavity at its core. The resonant cavity consists of the gyroscope housing, four mirrors, and three sealed electrodes. The cavity is filled with a certain amount of high-purity helium-neon gas. High-voltage discharge between the electrodes breaks down the working gas, continuously exciting gas atoms to emit photons. These photons oscillate and select frequencies between the mirrors, forming a stable, single-frequency laser beam. Because a certain amount of high-purity helium-neon gas must be stored within the resonant cavity, any leaks in the working gas will affect its lifespan; therefore, strict requirements are placed on the cavity's sealing performance.

[0004] The reflector is firmly attached to the gyroscope cavity using optical adhesive, while the electrodes are sealed to the gyroscope cavity using highly malleable indium wire (referred to as "indium sealing"). To achieve highly reliable sealing performance, the following two conditions must be met: 1) The indium wire must be used within a certain time after special treatment (e.g., cleaning treatment), otherwise the adhesion between indium and the gyroscope cavity will be affected; 2) The electrodes need to be heated and subjected to a certain pressure during the indium sealing process to ensure the final thickness of the indium layer.

[0005] Current indium sealing technology can only seal one electrode, while each laser gyroscope has three electrodes. Therefore, each laser gyroscope requires three indium sealing processes, each taking 20 minutes, for a total of 60 minutes per gyroscope. This method suffers from being time-consuming and inefficient. Furthermore, as mentioned earlier, because the indium wire has a limited lifespan after special treatment, the long sealing time will cause the indium wire to become unusable due to exceeding its lifespan, resulting in material waste. Repeated small-batch processing of the indium wire would also consume manpower, further reducing the efficiency of indium sealing. Summary of the Invention

[0006] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a method for simultaneous indium sealing of multiple electrodes in laser gyroscopes. This method can achieve simultaneous indium sealing of three electrodes, saving manpower and resources while ensuring that the indium sealing quality is no less than that of the original method, and reducing the processing time to one-third of the original time.

[0007] To address the aforementioned technical problems, this invention discloses a method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, comprising:

[0008] Using a pre-assembly fixture, three electrodes are pre-assembled onto the gyroscope cavity; the three electrodes are: a cathode electrode, a first anode electrode, and a second anode electrode.

[0009] Using an indium encapsulation tool, the three electrodes pre-assembled on the gyroscope cavity are indium encapsulated onto the gyroscope cavity.

[0010] In the above method for simultaneous indium sealing of multiple electrodes for laser gyroscopes, the pre-assembly fixture includes: a pre-pressure fixing base and three pre-pressure auxiliary blocks; wherein, one end of each pre-pressure auxiliary block is slotted, and the shape of the slot is consistent with the shape of the corresponding electrode.

[0011] In the above-described method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, the three electrodes are pre-assembled onto the gyroscope cavity using a pre-assembly fixture, including:

[0012] Sub-step 11: Place the gyroscope cavity in the groove of the pre-pressed fixing base, with one indium cover of the gyroscope cavity facing upwards;

[0013] Sub-step 12: Place the cleaned indium ring onto the upward-facing indium cover;

[0014] Sub-step 13: Place the electrode that matches the upward-facing indium cover onto the indium ring;

[0015] Sub-step 14: Place the pre-compression auxiliary block that matches the electrode onto the electrode;

[0016] Sub-step 15: Place the assembled assembly from sub-steps 11 to 14 onto the worktable of the pre-pressure bench drill. Apply pressure to the pre-pressure auxiliary block using the pre-pressure bench drill to initially bond the electrode to the corresponding indium cover.

[0017] Sub-step 16: Following sub-steps 11-15, complete the preliminary bonding of the remaining two electrodes to the corresponding indium covers, thereby completing the pre-assembly of the three electrodes.

[0018] In the above method for simultaneous indium sealing of multiple electrodes for laser gyroscopes, in sub-step 12, the concentricity between the indium ring and the electrode hole on the indium cover is required to be less than 0.1 mm; in sub-step 13, the concentricity between the electrode and the indium ring is required to be less than 0.1 mm.

[0019] In the above-mentioned method for simultaneous indium sealing of multiple electrodes for laser gyroscopes, the indium sealing fixture includes: a base, three ceramic heating devices, three copper blocks, three temperature controllers, a cavity fixing device, and two hexagonal screws;

[0020] Each copper block has a slot cut at one end, and the shape of the slot is consistent with the shape of the corresponding electrode.

[0021] Three copper blocks are respectively installed at the ends of three ceramic heating devices;

[0022] The three ceramic heating elements are each connected to one of the three temperature controllers.

[0023] Two ceramic heating devices are set horizontally, and one ceramic heating device is set vertically; the two horizontally set ceramic heating devices are respectively mounted on the two side walls of the base by hexagonal screws.

[0024] In the above-described method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, the three electrodes pre-assembled on the gyroscope cavity are indium sealed onto the gyroscope cavity using an indium sealing fixture, including:

[0025] Sub-step 21: Place the base on the worktable of the indium sealing drill.

[0026] Sub-step 22: Place the gyroscope cavity pre-assembled with three electrodes on the base and adjust the position of the gyroscope cavity so that the three electrodes pre-assembled on the gyroscope cavity correspond to the positions of the corresponding copper blocks.

[0027] Sub-step 23: After the position and orientation of the gyroscope cavity are adjusted to the correct position, fix it using the cavity fixing device;

[0028] Sub-step 24: Control the indium sealing bench drill to apply downward pressure until the copper block in the vertically set ceramic heating device is in complete contact with the corresponding electrode;

[0029] Sub-step 25: Rotate the two hexagonal screws located on both sides of the base so that the copper blocks in the two horizontally set ceramic heating devices are in complete contact with the corresponding electrodes.

[0030] Sub-step 26: Turn on the three temperature controllers to start heating;

[0031] Sub-step 27: When the temperature reaches the set temperature T, control the indium sealing bench drill to apply a certain downward pressure F to the vertically set ceramic heating device; at the same time, use a torque wrench to rotate the two hexagonal screws located on both sides of the base to apply the same force as F to the two horizontally set ceramic heating devices.

[0032] Sub-step 28: After maintaining the set temperature T for a certain time t, allow it to cool naturally to room temperature, disassemble the fixture, and obtain the gyroscope cavity with three electrodes sealed in indium.

[0033] In the above method for simultaneous indium sealing of multiple electrodes for laser gyroscopes, the temperature T is set to 140℃~160℃.

[0034] In the above method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, the pressure F is 40~50N.

[0035] In the above method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, the time t is 5 min.

[0036] In the above method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, the ceramic heating device can heat temperatures of 0–400°C; the temperature controller can measure temperatures of 0–400°C.

[0037] The present invention has the following advantages:

[0038] This invention discloses a method for simultaneous indium sealing of multiple electrodes in a laser gyroscope, which can achieve simultaneous indium sealing of three electrodes. Under the premise that the indium sealing quality is not lower than that of the original, it saves manpower and material resources and reduces the processing time to one-third of the original. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating the steps of a method for simultaneous indium sealing of multiple electrodes in a laser gyroscope according to an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram illustrating the working principle of a pre-assembly fixture in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram illustrating the working principle of an indium encapsulation tooling in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0043] like Figure 1 In this embodiment, the method for simultaneous indium sealing of multiple electrodes in a laser gyroscope includes:

[0044] Step 1: Using a pre-assembly fixture, pre-assemble the three electrodes onto the gyroscope cavity.

[0045] In this embodiment, the three electrodes are: a cathode electrode, a first anode electrode, and a second anode electrode. For example... Figure 2 As shown, the pre-assembly fixture may specifically include: a pre-compression fixing base 1 and three pre-compression auxiliary blocks 2. Each pre-compression auxiliary block 2 has a slot at one end, the shape of which corresponds to the shape of the respective electrode.

[0046] Preferably, the pre-assembly process is as follows:

[0047] Sub-step 11: Place the gyroscope cavity in the groove of the pre-pressurized fixing base 1, so that one indium cover of the gyroscope cavity faces upward.

[0048] Sub-step 12: Place the cleaned indium ring onto the upward-facing indium cover. When placing the cleaned indium ring onto the upward-facing indium cover, the concentricity between the indium ring and the electrode hole on the indium cover must be less than 0.1 mm.

[0049] Sub-step 13 involves placing the electrode that matches the upward-facing indium cover onto the indium ring. When placing the electrode onto the indium ring, the concentricity between the electrode and the indium ring must be less than 0.1 mm.

[0050] Sub-step 14: Place the pre-compression auxiliary block 2, which matches the electrode, onto the electrode.

[0051] Sub-step 15: Place the assembled assembly from sub-steps 11 to 14 onto the worktable of the pre-pressure bench drill. Apply pressure to the pre-pressure auxiliary block 2 using the pre-pressure bench drill to initially bond the electrode to the corresponding indium cover.

[0052] Sub-step 16: Following sub-steps 11-15, complete the preliminary bonding of the remaining two electrodes to the corresponding indium covers, thereby completing the pre-assembly of the three electrodes.

[0053] Step 2: Using an indium sealing fixture, the three electrodes pre-assembled on the gyroscope cavity are indium sealed onto the gyroscope cavity.

[0054] In this embodiment, as Figure 3 The indium sealing fixture may specifically include: a base 3, three ceramic heating elements 4, three copper blocks 5, three temperature controllers 6, a cavity fixing device 7, and two hexagonal screws 8. Each copper block 5 has a slot at one end, the shape of which corresponds to the shape of the corresponding electrode. The three copper blocks 5 are respectively installed at the ends of the three ceramic heating elements 4. The three ceramic heating elements 4 are respectively connected to the three temperature controllers 6. Two ceramic heating elements 4 are horizontally arranged, and one is vertically arranged. The two horizontally arranged ceramic heating elements 4 are respectively installed on the two side walls of the base 3 using hexagonal screws 8. The ceramic heating elements 4 can heat temperatures from 0 to 400°C; the temperature controllers 6 can measure temperatures from 0 to 400°C.

[0055] Preferably, the indium sealing process is as follows:

[0056] Sub-step 21: Place base 3 on the worktable of the indium sealing drill.

[0057] Sub-step 22: Place the gyroscope cavity pre-assembled with three electrodes onto the base 3, and adjust the position of the gyroscope cavity so that the three electrodes pre-assembled on the gyroscope cavity correspond to the positions of the corresponding copper blocks 5.

[0058] Sub-step 23: After the position and orientation of the gyroscope cavity are adjusted to the correct position, it is fixed by the cavity fixing device 7.

[0059] Sub-step 24: Control the indium sealing bench drill to apply downward pressure until the copper block 5 inside the vertically set ceramic heating device 4 is in complete contact with the corresponding electrode.

[0060] In sub-step 25, rotate the two hexagonal screws 8 located on both sides of the base 3 so that the copper blocks 5 inside the two horizontally set ceramic heating devices 4 are in complete contact with the corresponding electrodes.

[0061] Sub-step 26: Turn on the three temperature controllers 6 to start heating.

[0062] In sub-step 27, once the temperature reaches the set temperature T, the indium-sealed bench drill applies a downward pressure F to the vertically positioned ceramic heating device 4; simultaneously, by rotating the two hexagonal screws 8 located on both sides of the base 3 with a torque wrench, the same force as F is applied to the two horizontally positioned ceramic heating devices 4. The set temperature T is 140℃~160℃; the pressure F is 40~50N.

[0063] Sub-step 28: After maintaining the set temperature T for a certain time t, allow it to cool naturally to room temperature, then disassemble the fixture to obtain the gyroscope cavity sealed with three electrodes in indium. The certain time t is 5 minutes.

[0064] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0065] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A method for laser gyroscope multi-electrode simultaneous indium sealing, characterized in that, The application relates to a pre-assembly tool for three electrodes on a gyro cavity, and an indium sealing tool for the three electrodes on the gyro cavity. The three electrodes pre-assembled on the gyro cavity are indium sealed on the gyro cavity through the indium sealing tool. The pre-assembly tool comprises a pre-pressing fixed base (1) and three pre-pressing auxiliary blocks (2); one end of each pre-pressing auxiliary block (2) is notched, and the notch shape is consistent with the shape of the corresponding electrode. The indium sealing tool comprises a base (3), three ceramic heating devices (4), three copper blocks (5), three temperature controllers (6), a cavity fixing device (7) and two hexagonal screws (8); one end of each copper block (5) is notched, and the notch shape is consistent with the shape of the corresponding electrode; the three copper blocks (5) are respectively arranged at the end portions of the three ceramic heating devices (4); the three ceramic heating devices (4) are connected with the three temperature controllers (6); two ceramic heating devices (4) are horizontally arranged, and one ceramic heating device (4) is vertically arranged; the two horizontally arranged ceramic heating devices (4) are respectively arranged on the two side walls of the base (3) through the hexagonal screws (8). The three electrodes are pre-assembled on the gyro cavity through the pre-assembly tool, which comprises the following sub-steps: 11, placing the gyro cavity in the recess of the pre-pressing fixed base (1) so that one indium sealing surface of the gyro cavity faces upwards; 12, placing the cleaned indium ring on the upwards facing indium sealing surface; 13, placing the electrode matched with the upwards facing indium sealing surface on the indium ring; 14, placing the pre-pressing auxiliary block (2) matched with the electrode on the electrode; 15, placing the whole assembly of the sub-steps 11-14 on the workbench of a pre-pressing drill, and applying a pressure on the pre-pressing auxiliary block (2) through the pre-pressing drill so that the electrode is preliminarily bonded with the corresponding indium sealing surface; 16, according to the sub-steps 11-15, preliminarily bonding the remaining two electrodes with the corresponding indium sealing surfaces, and then pre-assembling the three electrodes. ​ Through the indium sealing tool, three electrodes pre-assembled on the gyro cavity are sealed on the gyro cavity, comprising: sub-step 21, placing the base (3) on the workbench of the indium sealing drill; sub-step 22, placing the gyro cavity pre-assembled with three electrodes on the base (3), and adjusting the pose of the gyro cavity so that the three electrodes pre-assembled on the gyro cavity correspond to the positions of the corresponding copper blocks (5); sub-step 23, after the pose of the gyro cavity is adjusted in place, fixing through the cavity fixing device (7); sub-step 24, controlling the indium sealing drill to apply pressure downward to the copper blocks (5) in the vertically arranged ceramic heating device (4) to make the copper blocks (5) in the vertically arranged ceramic heating device (4) just fully contact with the corresponding electrodes; sub-step 25, rotating the two hexagonal screws (8) on both sides of the base (3) to make the copper blocks (5) in the two horizontally arranged ceramic heating devices (4) just fully contact with the corresponding electrodes; sub-step 26, turning on the three temperature controllers (6) to heat; sub-step 27, when the temperature reaches the set temperature T, controlling the indium sealing drill to apply a certain downward pressure F to the vertically arranged ceramic heating device (4); at the same time, rotating the two hexagonal screws (8) on both sides of the base (3) through the torque wrench to apply the same force F to the two horizontally arranged ceramic heating devices (4); sub-step 28, after maintaining the set temperature T for a certain time t, naturally cooling to room temperature, disassembling the tool, and obtaining the gyro cavity sealed with three electrodes.

2. The method for laser gyroscope multi-electrode simultaneous indium sealing according to claim 1, characterized in that, In sub-step 12, the concentricity of the indium ring and the electrode hole on the indium sealing surface is required to be less than 0.1mm; in sub-step 13, the concentricity of the electrode and the indium ring is required to be less than 0.1mm.

3. The method for laser gyroscope multi-electrode simultaneous indium sealing according to claim 1, characterized in that, The set temperature T is: 140℃~160℃.

4. The method for simultaneous indium sealing of multiple electrodes of a laser gyro according to claim 1, wherein, The pressure F is: 40~50N.

5. The method for simultaneous indium sealing of multiple electrodes of a laser gyro according to claim 1, wherein, The certain time t is: 5min.

6. The method for simultaneous indium sealing of multiple electrodes of a laser gyro according to claim 1, wherein, The heating temperature of the ceramic heating device (4) is: 0~400℃; the measurable temperature of the temperature controller (6) is: 0~400℃.

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