Resonant cavity assembly and annular helium-neon laser sensor

Abstract

The utility model belongs to the technical field of inertia, and particularly relates to a resonant cavity assembly and an annular helium-neon laser sensor. The microcrystal glass comprises a microcrystal glass framework 1, a circular electrode 3 arranged in the microcrystal glass framework and three metal electrodes 2 arranged on the periphery of the microcrystal glass framework 1, and the contact surfaces of the microcrystalline glass framework 1 and the three metal electrodes 2 are respectively plated with a layer of dielectric film. And the migration of Li < + > in the microcrystalline material of the annular helium-neon laser sensor under the action of an electric field is reduced, so that the working reliability of the annular helium-neon laser sensor in a high-temperature environment is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of inertial technology, and specifically relates to a resonant cavity assembly and a ring helium-neon laser sensor. Background Technology

[0002] The ring helium-neon laser sensor is an angular velocity sensor based on the Sagnac principle. The core sensing unit is a ring helium-neon laser with a microcrystalline glass frame. It uses the frequency difference information between two traveling waves propagating in the clockwise and counterclockwise directions in the ring helium-neon laser cavity to obtain the rotational angular velocity of the ring helium-neon laser cavity relative to the inertial space.

[0003] Ring-type helium-neon laser sensors possess outstanding characteristics such as a large dynamic range, short startup time, and stable scaling factor. The need for maintaining accuracy during hot standby in longer and harsher operating environments is becoming increasingly urgent, requiring further improvements in the long-term power-on performance stability of ring-type laser sensors.

[0004] The microcrystalline glass framework of the ring-shaped helium-neon laser sensor is mainly composed of SiO2, Al2O3, and Li2O. During operation, Li+ ions migrate under the influence of an electric field. Li+ ions migrate into the ring-shaped helium-neon laser and, during plasma flow, deposit on the outer surface of the microcrystalline glass framework, even migrating to the electrode surface. Li+ ions can escape their original lattice sites, leaving charged vacancies, or migrate to adjacent lattice sites with larger vacancies, forming charged interstitial ion defects. Li+ is one such interstitial ion defect. Without an external electric field, Li+ ions undergo random Brownian motion; however, with an applied directional electric field, more Li+ ions are generated, and the field exerts a force on the charged Li+ ions, causing a deflection of their Brownian motion and resulting in directional movement. The entire process is influenced by temperature, electric field, and the solid's own potential field. The operating environment of next-generation weapon systems is more complex, and the frequency of use is higher, requiring higher reliability from the ring-shaped laser sensor. Under high temperature and long-term operating conditions, Li+ migration is more frequent and rapid, leading to premature failure of the ring-shaped helium-neon laser sensor during the calibration period. Utility Model Content

[0005] The technical problem solved by this invention is to provide a method for reducing the migration of Li+ in the microcrystalline material of a ring-shaped helium-neon laser sensor under the action of an electric field, thereby effectively extending the reliability of the ring-shaped helium-neon laser sensor in high-temperature environments.

[0006] The technical solution of this utility model:

[0007] On the one hand, the present invention provides a resonant cavity assembly, which includes: a microcrystalline glass skeleton 1, a circular electrode 3 disposed inside the microcrystalline glass skeleton, and three metal electrodes 2 disposed around the microcrystalline glass skeleton 1.

[0008] A dielectric film is deposited on the contact surface between the microcrystalline glass skeleton 1 and the three metal electrodes 2.

[0009] Furthermore,

[0010] The dielectric film is a silicon nitride thin film.

[0011] Furthermore,

[0012] The thickness of the dielectric film is 20nm ± 2nm.

[0013] Furthermore,

[0014] The dielectric film extends 1 mm beyond each end of the metal electrode 2.

[0015] Furthermore,

[0016] The three metal electrodes 2 are connected in parallel to serve as the negative electrode, and the circular electrode 3 serves as the positive electrode. A DC voltage of 400V-500V is applied between the positive and negative electrodes to measure the migration amount of Li ions.

[0017] On the other hand, this utility model also provides a ring-shaped helium-neon excitation sensor, which is implemented using the aforementioned resonant cavity assembly.

[0018] This invention improves the conductivity of the microcrystalline glass framework by fixing a dielectric film layer at a fixed position on it, thus significantly reducing the potential in a high-resistivity material. This suppresses the migration of Li+ ions within the framework under an electric field, improving the long-term reliability of the ring-type helium-neon laser sensor. This invention not only definitively proposes process parameters and materials but also overcomes the previous limitations of qualitative analysis in studies of Li+ migration in the microcrystalline glass support of ring laser sensors, which lacked quantitative research and accurate observation. This paper provides specific data on Li+ migration current at different temperatures, demonstrating significant application value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the measurement of ion migration in the original microcrystalline glass framework;

[0020] Figure 2 This is a schematic diagram of the measurement of ion migration in the microcrystalline glass framework after the implementation of this utility model;

[0021] Figure 3 This is a schematic diagram comparing the amount of ion migration before and after the implementation of this utility model;

[0022] Among them, 1-microcrystalline glass skeleton, 2-metal electrode block, 3-metal electrode ring, 4-coating area Detailed Implementation

[0023] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] The technical solution of this utility model is as follows: A method to improve the long-term power-on reliability of a ring helium-neon laser sensor by reducing ion migration. A dielectric film is deposited on three locations of the microcrystalline glass skeleton electrode 2 of the ring helium-neon laser sensor. This dielectric film should be fabricated before the microcrystalline glass skeleton electrode 2 of the ring helium-neon laser sensor is installed.

[0025] Please see Figure 1 This is a schematic diagram of the conductivity measurement of the microcrystalline glass skeleton before the implementation of this utility model. First, a structure is fabricated as shown below. Figure 1 A microcrystalline glass framework was constructed, followed by polishing of the planes containing electrodes 2 and 3. These planes were then cleaned, and electrodes 2 and 3 were connected to the microcrystalline glass framework using molten indium. Finally, wires were used to connect the electrodes. Figure 1 The process ends here as shown by connecting the microcrystalline glass frame and the ammeter. In this embodiment, refer to... Figure 2 The steps are as follows:

[0026] Step 1. In Figure 2 A silicon nitride thin film with a thickness of 20nm±2nm is deposited at position 4 of the microcrystalline glass skeleton.

[0027] Step 2. Connect electrode 2 and electrode 3 to the microcrystalline glass skeleton using molten indium;

[0028] Step 3. Connect the electrodes and ammeter as shown in the diagram;

[0029] Step 4. Place the normally electrically connected microcrystalline glass holder into the high and low temperature chamber;

[0030] Step 5. Connect a 500V DC power supply to the positive and negative terminals;

[0031] Step 6. Record the ammeter data at different temperatures.

[0032] For current data prior to the implementation of this patent, please refer to [link / reference]. Figure 1 Repeat steps 2 through 6. The current data before and after implementation of this patent can be found in [link to patent details]. Figure 3 .

[0033] from Figure 3As can be seen, after the implementation of this invention, the current in the microcrystalline glass skeleton of the ring sensor at 120℃ is reduced to 1 / 3 of that before implementation, and the current in the microcrystalline glass skeleton of the ring laser sensor is zero below 60℃. After the implementation of this invention, in operating environments below 60℃, Li+ ions in the microcrystalline glass skeleton of the ring laser sensor do not migrate under the influence of an electric field.

[0034] In summary, this invention improves the long-term reliability of a ring helium-neon laser by adding a silicon nitride thin film coating in the middle of the Li+ movement path to reduce ion migration. This significantly increases the conductivity of the microcrystalline glass skeleton of the ring laser sensor, effectively hinders the migration of active ions, and increases the long-term working life and reliability of the laser gyroscope, thus having significant practical application value.

Claims

1. A resonant cavity assembly, characterized in that, The resonant cavity assembly includes: a microcrystalline glass skeleton (1), a circular electrode (3) disposed inside the microcrystalline glass skeleton, and three metal electrodes (2) disposed around the microcrystalline glass skeleton (1). A dielectric film is deposited on the contact surface between the microcrystalline glass skeleton (1) and the three metal electrodes (2).

2. The resonant cavity assembly according to claim 1, characterized in that, The dielectric film is a silicon nitride thin film.

3. A resonant cavity assembly according to claim 1, characterized in that, The thickness of the dielectric film is 20nm ± 2nm.

4. A resonant cavity assembly according to claim 1, characterized in that, The dielectric film extends 1 mm beyond both ends of the metal electrode (2).

5. A resonant cavity assembly according to claim 1, characterized in that, The three metal electrodes (2) are connected in parallel to serve as the negative electrode, and the circular electrode (3) serves as the positive electrode. A DC voltage of 400V-500V is applied between the positive and negative electrodes to measure the migration amount of Li ions.

6. A ring-shaped helium-neon laser sensor, characterized in that, The sensor is implemented using a resonant cavity assembly as described in any one of claims 1-5.

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