An integrated MEMS accelerometer single-axis fiber optic gyroscope

Abstract

The utility model discloses a single -axis optical fiber gyroscope of integrated MEMS accelerometer, including base, single -axis optical fiber gyroscope body, circuit board, magnetic shielding cover, the single -axis optical fiber gyroscope body is fixed in the base, the circuit board is fixed in the single -axis optical fiber gyroscope body, the magnetic shielding cover is fixed in the base, and the single -axis optical fiber gyroscope body, the circuit board cover, still be provided with MEMS accelerometer on the circuit board. The utility model integrates MEMS accelerometer in single -axis optical fiber gyroscope, reduces vibration interference, and precision is high.

Description

Technical Field

[0001] This utility model relates to a single-axis fiber optic gyroscope, specifically a single-axis fiber optic gyroscope integrating a MEMS accelerometer. Background Technology

[0002] Fiber optic gyroscopes are widely used in many fields, such as aerospace, marine navigation, and military guidance, due to their high precision, high reliability, and good anti-interference performance.

[0003] However, in practical applications, the accuracy of fiber optic gyroscopes is affected by various factors, such as temperature changes, vibration interference, and their own zero-bias drift. In particular, vibration interference can significantly impact the accuracy of fiber optic gyroscopes. Utility Model Content

[0004] To address the shortcomings of the existing technology, this invention provides a single-axis fiber optic gyroscope with an integrated MEMS accelerometer. This invention integrates the MEMS accelerometer into the single-axis fiber optic gyroscope, reducing vibration interference and achieving high accuracy.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a single-axis fiber optic gyroscope with integrated MEMS accelerometer, comprising a base, a single-axis fiber optic gyroscope body, a circuit board, and a magnetic shielding cover. The single-axis fiber optic gyroscope body is fixed to the base, the circuit board is fixed to the single-axis fiber optic gyroscope body, and the magnetic shielding cover is fixed to the base and covers the single-axis fiber optic gyroscope body and the circuit board. A MEMS accelerometer is also disposed on the circuit board.

[0006] The base has a first fastening hole, the magnetic shielding cover has a connecting piece, the connecting piece has a second fastening hole, and the second fastening hole is fastened to the first fastening hole by a bolt.

[0007] The base has a third fastening hole, and the single-axis fiber optic gyroscope body is fastened to the third fastening hole by bolts.

[0008] The base has a fourth fastening hole for fixing the base in place.

[0009] The single-axis fiber optic gyroscope body is provided with three positioning posts, and the circuit board has three positioning and fastening holes, which are connected to the positioning posts.

[0010] The magnetic shielding cover includes, from the inside out, a permalloy layer, a support layer, an aluminum layer, and a protective layer.

[0011] In summary, this utility model achieves the following technical effects:

[0012] MEMS accelerometers are small in size, low in cost, and low in power consumption. They can measure the acceleration information of a carrier in real time. This invention combines MEMS accelerometers with fiber optic gyroscopes. The measurement data of the accelerometers can be used to compensate and correct the output of the fiber optic gyroscopes, thereby effectively improving the accuracy of the fiber optic gyroscopes and meeting more stringent application requirements.

[0013] This invention features a magnetic shielding cover to achieve electromagnetic shielding, prevent interference, and ensure the accuracy of the gyroscope. Attached Figure Description

[0014] Figure 1 It is a single-axis fiber optic gyroscope that integrates a MEMS accelerometer;

[0015] Figure 2 yes Figure 1 A schematic diagram of the decomposition process;

[0016] Figure 3 This is a schematic diagram of the cross-section of the magnetic shielding cover. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Example:

[0024] Figure 1 It is a single-axis fiber optic gyroscope that integrates a MEMS accelerometer. Figure 2 yes Figure 1 The exploded view includes a base 1, a single-axis fiber optic gyroscope body 2, a circuit board 3, and a magnetic shielding cover 4. The single-axis fiber optic gyroscope body 2 is fixed to the base 1, the circuit board 3 is fixed to the single-axis fiber optic gyroscope body 2, and the magnetic shielding cover 4 is fixed to the base 1 and covers the single-axis fiber optic gyroscope body 2 and the circuit board 3. A MEMS accelerometer 5 is also provided on the circuit board 3.

[0025] In practical applications, the carrier is often subjected to various vibration interferences, which can cause additional output errors in the fiber optic gyroscope. This application adds a MEMS accelerometer, which can monitor the vibration acceleration of the carrier in real time. The vibration acceleration is used to correct the output of the fiber optic gyroscope and ensure the accuracy of the fiber optic gyroscope output.

[0026] The base 1 has a first fastening hole 11, and the magnetic shielding cover 4 is provided with a connecting piece 41. The connecting piece 41 has a second fastening hole 42, and the second fastening hole 42 is fastened to the first fastening hole 11 by bolts.

[0027] The base 1 has a square structure, the magnetic shielding cover 4 has a cylindrical structure, the inner circle of the connecting piece 41 matches and connects with the magnetic shielding cover 4, and the outer edge of the connecting piece 41 matches and connects with the base 1.

[0028] This invention features a magnetic shielding cover to achieve electromagnetic shielding, prevent interference, and ensure the accuracy of the gyroscope.

[0029] The base 1 has a third fastening hole 12, and the single-axis fiber optic gyroscope body 2 is fastened to the third fastening hole 12 by bolts.

[0030] The base 1 has a fourth fastening hole 13 for fixing the base 1.

[0031] The single-axis fiber optic gyroscope body 2 is provided with three positioning posts 21, and the circuit board 3 is provided with three positioning and fastening holes 31, which are connected to the positioning posts 21.

[0032] The circuit board 3 also houses electronic components (not shown) capable of processing signals. The connection between the circuit board and the single-axis fiber optic gyroscope body 2, and the connection between the circuit board and the MEMS accelerometer 5, are existing technologies and will not be described further here. The single-axis fiber optic gyroscope body 2 and the MEMS accelerometer 5 can be industry-standard models.

[0033] Figure 3 This is a cross-sectional schematic diagram of the magnetic shielding cover 4, which includes a permalloy layer 401, a support layer 402, an aluminum layer 403, and a protective layer 404 arranged sequentially from the inside out.

[0034] The support layer 402 is made of plastic or wood and its thickness is greater than that of the permalloy layer 401 and the aluminum layer 403 to achieve the support function. The permalloy layer 401 can shield low-frequency electromagnetic waves, and the aluminum layer 403 can shield high-frequency electromagnetic waves. The protective layer 404 is made of plastic to prevent damage to the internal layers.

[0035] The outer casing of this application can shield high and low frequency electromagnetic waves, prevent electromagnetic interference, and ensure the output accuracy of the single-axis fiber optic gyroscope.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A single-axis fiber optic gyroscope integrating a MEMS accelerometer, characterized in that: The device includes a base (1), a single-axis fiber optic gyroscope body (2), a circuit board (3), and a magnetic shielding cover (4). The single-axis fiber optic gyroscope body (2) is fixed to the base (1), the circuit board (3) is fixed to the single-axis fiber optic gyroscope body (2), and the magnetic shielding cover (4) is fixed to the base (1) and covers the single-axis fiber optic gyroscope body (2) and the circuit board (3). A MEMS accelerometer (5) is also provided on the circuit board (3). The single-axis fiber optic gyroscope body (2) is provided with three positioning posts (21), and the circuit board (3) is provided with three positioning fastening holes (31), which are connected to the positioning posts (21); The magnetic shielding cover (4) includes a permalloy layer (401), a support layer (402), an aluminum layer (403), and a protective layer (404) arranged sequentially from the inside to the outside. The support layer (402) is made of plastic or wood and its thickness is greater than that of the permalloy layer (401) and the aluminum layer (403). The permalloy layer (401) can shield low-frequency electromagnetic waves, the aluminum layer (403) can shield high-frequency electromagnetic waves, and the protective layer (404) is made of plastic.

2. A single-axis fiber optic gyroscope integrating a MEMS accelerometer according to claim 1, characterized in that: The base (1) has a first fastening hole (11), the magnetic shielding cover (4) has a connecting piece (41), the connecting piece (41) has a second fastening hole (42), and the second fastening hole (42) is fastened to the first fastening hole (11) by bolts.

3. A single-axis fiber optic gyroscope integrating a MEMS accelerometer according to claim 1, characterized in that: The base (1) has a third fastening hole (12), and the single-axis fiber optic gyroscope body (2) is fastened to the third fastening hole (12) by bolts.

4. A single-axis fiber optic gyroscope integrating a MEMS accelerometer according to claim 1, characterized in that: The base (1) has a fourth fastening hole (13) for fixing the base (1).

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