Installation mode and test method of triaxial fiber-optic gyroscope

Abstract

The invention provides a mounting mode and a testing method of a triaxial fiber-optic gyroscope, and belongs to the technical field of fiber-optic gyroscopes. Comprising the following steps: fixedly mounting a precise electric three-dimensional rotary table on a test platform in a temperature cycle box with an isolation foundation; a plurality of three-axis fiber-optic gyroscopes are fixed on a mounting disc of the precise electric three-dimensional rotating table, and the initial sensitive axial direction is the first axial direction; the sensitive axial direction of the three-axis fiber-optic gyroscope is sequentially switched into a second axial direction and a third axial direction through the automatic rotation of the precise electric three-dimensional rotating table; and at each temperature point, three axial performance indexes are respectively tested. Automatic testing of three sensitive axial directions under multiple temperature points is achieved through one-time installation, the testing efficiency and precision are remarkably improved, and the production period is shortened.

Description

Technical Field

[0001] This invention belongs to the field of fiber optic gyroscope technology, specifically relating to an installation method and testing method for a three-axis fiber optic gyroscope, which is particularly suitable for performance testing of three-axis fiber optic gyroscopes at multiple temperature points in mass production. Background Technology

[0002] Three-axis fiber optic gyroscopes are widely used in aerospace, navigation systems, and other fields, and their performance testing is a critical step in the production process. Traditional three-axis fiber optic gyroscope testing methods have the following problems: 1. Low installation efficiency: Each test requires the separate installation of three sensitive axes, and repeated installation at various temperature points, which is time-consuming and labor-intensive; 2. Long testing cycle: Traditional tooling fixtures can only test 3 gyroscopes at a time, and multiple installations and temperature maintenance are required, resulting in a testing cycle of more than 7 days (7 days is under ideal testing conditions; the testing cycle will be even longer when encountering testing equipment or other malfunctions); 3. Complex operation: Screws freeze and cannot be installed under low-temperature conditions, requiring reinstallation after heating, further extending the testing time; 4. Human error: Sensitive axis selection is prone to errors, requiring additional time for adjustment, affecting testing accuracy and efficiency.

[0003] Currently, no installation and testing method has been proposed that can simultaneously solve the above problems. Therefore, there is an urgent need for an efficient and accurate installation and testing method for three-axis fiber optic gyroscopes to meet the needs of mass production. Summary of the Invention

[0004] The technical problem solved by this invention is to provide an installation method and testing method for a three-axis fiber optic gyroscope. This invention enables automatic testing of three sensitive axes at multiple temperature points through a single installation, significantly improving testing efficiency and accuracy and shortening the production cycle.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The installation and testing methods for a three-axis fiber optic gyroscope include the following steps: A precision electric three-dimensional rotary table is fixedly installed on a test platform inside a temperature cycling chamber with an isolated foundation; Multiple three-axis fiber optic gyroscopes are fixed on the mounting plate of the precision electric three-dimensional rotary stage, with the initial sensitive axis being the first axis; The sensitive axes of the three-axis fiber optic gyroscope are switched sequentially to the second and third axes by the automatic rotation of the precision electric three-dimensional rotary table. The performance indicators of the three axes were tested at various temperature points.

[0006] To further define the above scheme, during initial installation, the Z-axis of all three-axis fiber optic gyroscopes is aligned with the rotation axis of the precision electric three-dimensional rotary stage as the first axis. The temperature circulation chamber is controlled to rise or fall to the first test temperature point. After the temperature stabilizes, the Z-axis performance is tested. Start the precision electric three-dimensional rotary table, rotate the mounting plate 90° around the first rotation axis, align the X-axis of the three-axis fiber optic gyroscope as the second axis with the rotation axis of the precision electric three-dimensional rotary table, and perform X-axis performance testing. After completing the X-axis test, control the precision electric three-dimensional rotary stage to rotate 90° around the second rotation axis, so that the Y-axis of the three-axis fiber optic gyroscope is aligned with the rotation axis of the precision electric three-dimensional rotary stage, and perform the Y-axis performance test. Repeat the above rotation and testing process to complete the triaxial performance test at all preset temperature points; the test data are recorded and output in real time through the data acquisition system built into the temperature cycling chamber.

[0007] Further defining the above solution, the precision electric three-dimensional rotary table has three mutually perpendicular rotation axes, enabling the mounting plate to rotate precisely in three degrees of freedom in space, with a rotation angle control accuracy better than 0.1°.

[0008] To further define the above solution, the mounting plate is provided with 4 mounting positions, which can simultaneously fix 4 three-axis fiber optic gyroscopes.

[0009] As a further limitation of the above scheme, the three-axis fiber optic gyroscope is fixed to the mounting plate by screws.

[0010] Further defining the above scheme, the test temperature points include room temperature, high temperature and low temperature, with room temperature being 25℃, high temperature being 85℃ and low temperature being -55℃.

[0011] Further defining the above scheme, the performance tests include, but are not limited to, zero-bias testing, zero-bias stability testing, zero-bias repeatability testing, and scaling factor repeatability testing.

[0012] Advantages of this invention compared to existing technologies: 1. This solution has the advantage of high-efficiency installation: testing of three sensitive axes can be completed in one installation without repeated disassembly and assembly, greatly improving installation efficiency; 2. This solution is suitable for batch testing: it can test 4 or more gyroscopes simultaneously, further improving testing efficiency; 3. This solution shortens the production cycle: the testing cycle is reduced from the traditional 7 days to less than 3 days, significantly improving production efficiency; 4. This solution can precisely control the testing accuracy: It adopts a precision electric three-dimensional rotary table for automated rotation, avoiding human error and improving testing accuracy; 5. This solution is highly adaptable: it can be applied to multi-temperature point testing and solves the problem of low-temperature installation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the initial state of the Z-axis sensing of the gyroscope mounted on a precision electric three-dimensional rotary table in this invention. Figure 2 This is a schematic diagram of the X-axis sensitivity of the precision electric three-dimensional rotary table after it has rotated 90° in this invention; Figure 3 This is a schematic diagram of the Y-axis sensitivity of the precision electric three-dimensional rotary table after it has rotated 90° in this invention; Figure 4 This is a schematic diagram of the structure of the precision electric three-dimensional rotary table in this invention; Figure 5 This is a schematic diagram illustrating the axial definition of the three-axis fiber optic gyroscope in this invention. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0016] Please see Figure 1-5 The embodiments of the present invention are described in detail below.

[0017] Example: This example provides an installation method and testing method for a three-axis fiber optic gyroscope. This example uses the testing of four three-axis fiber optic gyroscopes. The axis of the three-axis fiber optic gyroscope is defined as follows: Figure 5 As shown. Specifically, it includes the following steps: The precision electric three-dimensional rotary table 1 is fixedly installed on the test platform inside the temperature cycling chamber with an isolated foundation; Four three-axis fiber optic gyroscopes 3 are fixed on the mounting plate 2 of the precision electric three-dimensional rotary stage 1, specifically as follows: Figure 1As shown, the sensitive axis of the three-axis fiber optic gyroscope is the Z-axis at this time, so that the Z-axis of the three-axis fiber optic gyroscope 3 is aligned with the rotation axis of the precision electric three-dimensional rotary stage 1 as the first axis during initial installation; control the temperature cycle chamber to heat up or cool down to the first test temperature point, and after the temperature stabilizes, perform Z-axis performance testing; After the Z-axis performance test is completed at the same temperature, the precision electric three-dimensional rotary stage 1 is started, causing the mounting plate 2 to rotate 90° around the first rotation axis (i.e., the mounting plate changes from a horizontal to a vertical direction). At this time, the X-axis of the three-axis fiber optic gyroscope 3, as the second axis, is aligned with the rotation axis of the precision electric three-dimensional rotary stage 1 for X-axis performance testing; the sensitive X-axis is as follows... Figure 2 As shown.

[0018] After completing the X-axis test, the precision electric three-dimensional rotary stage 1 is controlled to rotate 90° around the second rotation axis (i.e., the mounting plate rotates 90° vertically), so that the Y-axis of the three-axis fiber optic gyroscope 3, as the third axis, is aligned with the rotation axis of the precision electric three-dimensional rotary stage 1, and the Y-axis performance test is performed; the sensitive Y-axis is as follows... Figure 3 As shown Repeat the above rotation and testing process to complete the triaxial performance test at all preset temperature points; the test data are recorded and output in real time through the data acquisition system built into the temperature cycling chamber.

[0019] In the above embodiments, the precision electric three-dimensional rotary table 1 has three mutually perpendicular rotation axes, which can realize the precise rotation of the mounting plate in three degrees of freedom in space, and the rotation angle control accuracy is better than 0.1°.

[0020] In the above embodiment, the mounting plate 2 is provided with four mounting positions, capable of simultaneously fixing four three-axis fiber optic gyroscopes 3. For details, please refer to... Figure 4 As shown, the three-axis fiber optic gyroscope 3 is fixed to the mounting plate 2 by screws, and the mounting plate 2 is provided with a pair of screw fixing holes evenly distributed on it.

[0021] In the above embodiments, the preset temperature points include room temperature, high temperature, and low temperature; the room temperature is generally 25℃, the high temperature is 85℃, and the low temperature is -55℃. The performance tests include, but are not limited to, zero-bias testing, zero-bias stability testing, zero-bias repeatability testing, and scaling factor repeatability testing.

[0022] In this embodiment, to enable testing of the performance indicators of all three sensitive axes of a three-axis fiber optic gyroscope with a single installation, a precision motorized three-dimensional rotary table is installed in a temperature-controlled chamber with an isolated foundation. This installation method allows for the simultaneous installation of multiple three-axis fiber optic gyroscopes, with each gyroscope requiring only one installation. At each test temperature point, the automatic rotation of the precision motorized three-dimensional rotary table on the test platform senses the three axes of the fiber optic gyroscope, allowing for the testing of the gyroscope's performance indicators along all three axes at the same temperature. This achieves the goal of testing the gyroscope's performance indicators along all three axes at a single installation, significantly improving installation and testing efficiency and making it suitable for multi-temperature-point performance testing in mass production.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. The installation method and testing method of a three-axis fiber optic gyroscope, characterized in that: Includes the following steps: The precision electric three-dimensional rotary table (1) is fixedly installed on the test platform inside the temperature circulation chamber with an isolated foundation; Multiple three-axis fiber optic gyroscopes (3) are fixed on the mounting plate (2) of the precision electric three-dimensional rotary stage (1), with the initial sensitive axis being the first axis; The sensitive axis of the three-axis fiber optic gyroscope (3) is switched to the second axis and the third axis in sequence by the automatic rotation of the precision electric three-dimensional rotary table (1); The performance indicators of the three axes were tested at various temperature points.

2. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 1, characterized in that: During initial installation, the Z-axis of all three-axis fiber optic gyroscopes (3) is aligned with the rotation axis of the precision electric three-dimensional rotary stage (1) as the first axis. The temperature circulation chamber is controlled to heat up or cool down to the first test temperature point. After the temperature stabilizes, the Z-axis performance is tested. Start the precision electric three-dimensional rotary table (1), rotate the mounting plate (2) 90° around the first rotation axis, align the X-axis of the three-axis fiber optic gyroscope (3) with the rotation axis of the precision electric three-dimensional rotary table (1) as the second axis, and perform X-axis performance testing. After completing the X-axis test, control the precision electric three-dimensional rotary table (1) to rotate 90° around the second rotation axis, so that the Y-axis of the three-axis fiber optic gyroscope (3) is aligned with the rotation axis of the precision electric three-dimensional rotary table (1) as the third axis, and perform the Y-axis performance test. Repeat the above rotation and testing process to complete the triaxial performance test at all preset temperature points; the test data are recorded and output in real time through the data acquisition system built into the temperature cycling chamber.

3. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 1, characterized in that: The precision electric three-dimensional rotary table (1) has three mutually perpendicular rotation axes, which can realize the precise rotation of the mounting plate in three degrees of freedom in space, and the rotation angle control accuracy is better than 0.1°.

4. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 1, characterized in that: The mounting plate (2) has four mounting stations, which can simultaneously fix four three-axis fiber optic gyroscopes (3).

5. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 4, characterized in that: The three-axis fiber optic gyroscope (3) is fixed to the mounting plate (2) by screws.

6. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 1, characterized in that: The test temperature points include room temperature, high temperature and low temperature, with room temperature being 25℃, high temperature being 85℃ and low temperature being -55℃.

7. The installation method and testing method of the three-axis fiber optic gyroscope according to claim 1, characterized in that: The performance tests include, but are not limited to, zero-bias testing, zero-bias stability testing, zero-bias repeatability testing, and scaling factor repeatability testing.

Images