Compact optical fiber inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS (Micro Electro Mechanical System) adder

Abstract

The compact optical fiber inertial measurement device comprises a system body, a box body, an upper cover, a first 50 single-axis optical fiber gyroscope, a second 50 single-axis optical fiber gyroscope, a third 50 single-axis optical fiber gyroscope, an addition meter assembly, a signal processing and interface circuit, a secondary power supply circuit and an electric connector assembly, wherein the system body is arranged in the box body; the upper cover is connected with the open end of the box body; the first 50 single-axis fiber-optic gyroscope, the second 50 single-axis fiber-optic gyroscope, the third 50 single-axis fiber-optic gyroscope, the additional meter assembly, the signal processing and interface circuit, the secondary power supply circuit and the electric connector assembly are all arranged on the system body. According to the invention, the core structure size of the optical fiber inertial measurement device is more compact, the size and weight of the optical fiber inertial measurement device are greatly reduced, and the integration level and assembly manufacturability of the system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of inertial measurement, and in particular relates to a compact optical fiber inertial measurement device based on a 50 single-axis optical fiber gyroscope and a MEMS meter. Background Art

[0002] Famous foreign fiber optic gyroscope manufacturers such as KVH, IXblue, EMCORE, Honeywell, and Northorp Grumman all have one or more compact fiber optic inertial measurement devices with a circumference diameter of 3.5 inches (88.9 mm). Typical products include TAC-450, KVH-1750, EN-300, and LN-200. In order to achieve a compact design of the fiber optic inertial measurement device, each company adopts a design scheme of a three-axis integrated fiber optic gyroscope with MEMS plus meter. The three-axis integrated fiber optic gyroscope has the advantages of low power consumption and low cost, but it also has the disadvantages of high skill requirements for assembly personnel, easy mutual interference between the signals of each sensitive axis, and the three optical fibers are coiled with each other and are not easy to disassemble and repair after curing. The use of a single-axis gyroscope solution can greatly reduce the skill requirements for operators, facilitate efficient mass production, facilitate the separate replacement or repair of each axis gyroscope, and avoid mutual interference between the signals of each sensitive axis. However, the fiber optic inertial measurement device based on the single-axis gyroscope design is usually large in size, which is not conducive to the miniaturization of the fiber optic inertial measurement device. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS accelerator, so that the core structure size of the fiber optic inertial measurement device is more compact, the volume and weight of the fiber optic inertial measurement device are greatly reduced, and the system integration and assembly processability are improved.

[0004] The object of the present invention is achieved through the following technical scheme: A compact fiber-optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter, comprising: a system body, a box, an upper cover, a first 50 single-axis fiber optic gyroscope, a second 50 single-axis fiber optic gyroscope, a third 50 single-axis fiber optic gyroscope, a meter component, a signal processing and interface circuit, a secondary power supply circuit and an electrical connector component; wherein the system body is arranged inside the box; the upper cover is connected to the open end of the box; the first 50 single-axis fiber optic gyroscope, the second 50 single-axis fiber optic gyroscope, the third 50 single-axis fiber optic gyroscope, the meter component, the signal processing and interface circuit, the secondary power supply circuit and the electrical connector component are all arranged on the system body.

[0005] In the above-mentioned compact fiber-optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter, the MEMS meter component includes a first meter circuit board and a second meter circuit board; wherein, one meter is installed on the first meter circuit board; two meters are orthogonally installed on the second meter circuit board, and the meter circuit boards are connected by flexible wires; the first meter circuit board and the second meter circuit board are orthogonally installed on the system body.

[0006] In the above-mentioned compact fiber-optic inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS meter, the electrical connector assembly includes an electrical connector bracket and an electrical connector; wherein the electrical connector is arranged on the electrical connector bracket; and the electrical connector bracket is installed on the system body.

[0007] In the above-mentioned compact fiber-optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter, the system body includes a first gyroscope mounting surface, a second gyroscope mounting surface, a first gyroscope optical path component mounting surface, a second gyroscope circuit component mounting surface, a first meter circuit board mounting surface, a second meter circuit board mounting surface, a notch, a signal processing and interface circuit mounting surface, a secondary power supply circuit mounting surface, a top surface, an external mounting surface and an electrical connector component mounting surface; wherein, the first gyroscope mounting surface is used to mount a first 50 single-axis fiber optic gyroscope, and the second gyroscope mounting surface is used to mount a second 50 single-axis fiber optic gyroscope; the first gyroscope optical path component mounting surface is used to mount a first optical path component of a third 50 single-axis fiber optic gyroscope, and the second gyroscope circuit component mounting surface is used to mount a second optical path component of a third 50 single-axis fiber optic gyroscope, and the guide connecting the first optical path component and the second optical path component The wire and optical fiber pass through the notch on the system body; the first metering circuit board mounting surface is used to mount the first metering circuit board, and the second metering circuit board mounting surface is used to mount the second metering circuit board; the signal processing and interface circuit mounting surface is used to mount the signal processing and interface circuit, the signal processing and interface circuit mounting surface and the first gyroscope mounting surface are located on the same side, and the signal processing and interface circuit is located outside the first 50 single-axis fiber optic gyroscope; the secondary power supply circuit mounting surface is used to mount the secondary power supply circuit, the secondary power supply circuit mounting surface and the second gyroscope circuit assembly mounting surface are located on the same side, and the secondary power supply circuit is located outside the second optical path assembly; the electric connector assembly mounting surface is used to mount the electric connector assembly, and the electric connector assembly mounting surface is located in the middle part of the system body on the side facing the gyroscope optical path assembly mounting surface.

[0008] In the above-mentioned compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter, a plurality of threaded holes are provided on the top surface of the system body for threaded connection with the upper cover.

[0009] In the above-mentioned compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter, a plurality of second threaded holes are provided on the external mounting surface at the bottom of the system body for threaded connection with the box body.

[0010] The compact fiber optic inertial measurement device based on the 50 single-axis fiber optic gyroscope and MEMS accelerator further includes: a reinforcement bar; wherein the end surface of the notch is used to install the reinforcement bar, and the reinforcement bar protects the optical fiber and the wire passing through the notch.

[0011] The above-mentioned compact fiber-optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter also includes: a pad column I; wherein one end of the pad column I passes through the first 50 single-axis fiber optic gyroscope and is connected to the system body, and the other end of the pad column I is connected to the signal processing and interface circuit.

[0012] The above-mentioned compact fiber-optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter also includes: a pad column II; wherein one end of the pad column I passes through the second optical path component of the third 50 single-axis fiber optic gyroscope and is connected to the system body, and the other end of the pad column I is connected to the secondary power supply circuit.

[0013] In the above-mentioned compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter, a plurality of threaded holes are provided on the top surface of the system body for threaded connection with the countersunk holes corresponding to each threaded hole of the upper cover; the upper cover is provided with an electrical connector outlet.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention makes the core structure size of the fiber-optic inertial measurement device more compact by installing two integrated 50 single-axis fiber-optic gyroscopes and one split 50 single-axis fiber-optic gyroscope on the system body, thereby greatly reducing the volume and weight of the fiber-optic inertial measurement device;

[0016] (2) The present invention improves the system integration and assembly processability by installing three MEMS accelerometers on two circuit boards and connecting the two circuit boards with flexible wires;

[0017] (3) The core of the optical fiber inertial measurement device of the present invention is independent of the box and the upper cover. In applications where the installation space is critical, the user can remove the box and the upper cover to use the core of the optical fiber inertial measurement device alone.

[0018] (4) The fiber optic inertial measurement device of the present invention uses 50 single-axis fiber optic gyroscopes for assembly, and does not require optical path welding, which reduces the skill requirements for assembly personnel, lowers the production threshold, and improves production efficiency;

[0019] (5) The rectangular flat plate of the electrical connector socket of the present invention is 12 mm lower than the upper surface of the upper cover. After the user electrical connector plug is connected to it, the user electrical connector plug is also lower than the upper surface of the upper cover, further saving installation space for the user;

[0020] (5) The present invention uses a scheme combining an integrated single-axis fiber optic gyroscope with a split single-axis fiber optic gyroscope to design a fiber optic inertial measurement device, which achieves better assembly and maintainability than a three-axis integrated fiber optic gyroscope, and achieves a smaller size than using three integrated single-axis fiber optic gyroscopes, eliminates signal interference between the sensitive axes of the three-axis integrated gyroscope scheme, and concentrates the advantages of the two.

[0021] (6) In the present invention, the signal processing and interface circuit and the secondary power supply circuit are installed on both sides of the core of the optical fiber inertial measurement device, thereby avoiding mutual interference between the power supply and the signal;

[0022] (7) In the present invention, the upper cover is rigidly connected to both the system body and the box body, thereby improving the overall rigidity of the fiber optic inertial measurement device, increasing the heat dissipation channel of the active heating device, and achieving a lightweight design for the system body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 is an exploded view of the compact optical fiber inertial measurement device of the present invention;

[0025] Figure 2 It is an isometric view of the core of the compact fiber optic inertial measurement device of the present invention;

[0026] Figure 3 For the present invention Figure 2 Bottom view of

[0027] Figure 4 It is an isometric view of the system body of the present invention;

[0028] Figure 5 For the present invention Figure 4 Bottom view of

[0029] Figure 6 For the present invention Figure 5 Rear view of

[0030] Figure 7 This is a diagram of the overall appearance of the compact optical fiber inertial measurement device of the present invention;

[0031] Figure 8 It is the circumferential size envelope diagram of the 50 single-axis fiber optic gyroscope and the optical path component of the present invention when the interval is 4mm;

[0032] Fig. 9 This is the envelope diagram of the circumferential dimensions of two integrated 50 single-axis gyroscopes with a spacing of 1.5 mm. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Figure 1 is an exploded view of the compact optical fiber inertial measurement device of the present invention; Figure 2 It is an isometric view of the core of the compact fiber optic inertial measurement device of the present invention; Figure 3 For the present invention Figure 2 Bottom view of the Figure 1 , Figure 2 , Figure 3 As shown, the compact fiber-optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter includes: a system body 1, a box 2, an upper cover 3, a first 50 single-axis fiber optic gyroscope 4a, a second 50 single-axis fiber optic gyroscope 4b, a third 50 single-axis fiber optic gyroscope, a MEMS meter component, a signal processing and interface circuit 6, a secondary power supply circuit 7 and an electrical connector component 9; wherein the system body 1 is arranged inside the box 2; the upper cover 3 is connected to the open end of the box 2; the first 50 single-axis fiber optic gyroscope 4a, the second 50 single-axis fiber optic gyroscope 4b, the third 50 single-axis fiber optic gyroscope 4c, the MEMS meter component, the signal processing and interface circuit 6, the secondary power supply circuit 7 and the electrical connector component 9 are all arranged on the system body 1.

[0035] The 50 single-axis fiber optic gyroscope used is formed by connecting an optical path component and a circuit component through screws. The split 50 single-axis fiber optic gyroscope can be obtained by removing the screws connecting the optical path component and the circuit component. The 50 single-axis fiber optic gyroscope used has an outer dimension of 50×50×32 (mm), wherein the dimension of the optical path component is 50×50×13.4 (mm), and the dimension of the circuit component is 50×50×18.6 (mm); the three 50 single-axis fiber optic gyroscopes are the first 50 single-axis fiber optic gyroscope 4a, the second 5 0 single-axis fiber optic gyroscope 4b, a third single-axis fiber optic gyroscope 50; the MEMS counter assembly 5 is composed of a counter circuit board 5a and a counter circuit board 5b, one MEMS counter is installed on the counter circuit board 5a, and two MEMS counters are orthogonally installed on the counter circuit board 5b, and the counter circuit board 5a and the counter circuit board 5b are connected by a flexible line; the counter circuit board 5a and the counter circuit board 5b are orthogonally installed on the counter circuit board installation surface of the system body 1 to realize that the three MEMS counters are orthogonal to each other.

[0036] The MEMS meter assembly includes a first meter circuit board 5a and a second meter circuit board 5b; wherein, a MEMS meter is installed on the first meter circuit board 5a; two MEMS meters are orthogonally installed on the second meter circuit board 5b, and the meter circuit board 5a and the meter circuit board 5b are connected by a flexible wire; the first meter circuit board 5a and the second meter circuit board 5b are orthogonally installed on the system body 1.

[0037] The electrical connector assembly 9 includes an electrical connector bracket 9a and an electrical connector 9b; wherein the electrical connector 9b is arranged on the electrical connector bracket 9a; and the electrical connector bracket 9a is installed on the system body 1.

[0038] The system body 1 includes a first gyroscope mounting surface 1a, a second gyroscope mounting surface 1b, a first gyroscope optical path component mounting surface 1c-1, a second gyroscope circuit component mounting surface 1c-2, a first plus circuit board mounting surface 1d, a second plus circuit board mounting surface 1e, a notch 1f, a signal processing and interface circuit mounting surface 1g, a secondary power supply circuit mounting surface 1h, a top surface 1i, an external mounting surface 1j and an electrical connector component mounting surface 1k. Wherein, the first gyro mounting surface 1a is used to mount the first 50 single-axis fiber optic gyroscope 4a, and the second gyro mounting surface 1b is used to mount the second 50 single-axis fiber optic gyroscope 4b; the first gyro optical path component mounting surface 1c-1 is used to mount the first optical path component 4c-1 of the third 50 single-axis fiber optic gyroscope, and the second gyro circuit component mounting surface 1c-2 is used to mount the second optical path component 4c-2 of the third 50 single-axis fiber optic gyroscope, and the wire and optical fiber connecting the first optical path component 4c-1 and the second optical path component 4c-2 pass through the notch 1f on the system body 1; the first adding circuit board mounting surface 1d is used to mount the first adding circuit board 5a, and the second adding circuit board mounting surface 1e is used to mount the second adding circuit board 5b; The signal processing and interface circuit mounting surface 1g is used for mounting the signal processing and interface circuit 6, and the signal processing and interface circuit mounting surface 1g is located on the same side as the first gyroscope mounting surface 1a, and the signal processing and interface circuit 6 is located outside the first 50 single-axis fiber optic gyroscope 4a; the secondary power supply circuit mounting surface 1h is used for mounting the secondary power supply circuit 7, and the secondary power supply circuit mounting surface 1h is located on the same side as the second gyroscope circuit assembly mounting surface 1c-2, and the secondary power supply circuit 7 is located outside the second optical path assembly 4c-2; the electric connector assembly mounting surface 1k is used for mounting the electric connector assembly 9, and the electric connector assembly mounting surface 1k is located in the middle part of the system body 1 on the opposite side of the gyroscope optical path assembly mounting surface 1c1.

[0039] After the first meter circuit board 5a and the second meter circuit board 5b are installed in the system body 1, the three MEMS meters are sunk into the cavity surrounded by the meter circuit board and the system body, thereby achieving isolation protection for the three MEMS meters.

[0040] The signal processing and interface circuit mounting surface 1g is composed of three coplanar bosses on the same side of the gyro mounting surface 1a, and a threaded hole is opened at the center of each boss; the secondary power circuit mounting surface 1h is composed of three coplanar bosses on the same side of the gyro circuit assembly mounting surface 1c-2, and a threaded hole is opened at the center of each boss;

[0041] The electrical connector assembly mounting surface 1k is located in the middle of the system body 1 on the opposite side of the gyro optical path assembly mounting surface 1c1. After the electrical connector assembly 9 is mounted to the electrical connector assembly mounting surface 1k, the end surface of the electrical connector 9b is lower than the top surface 1i of the system body 1.

[0042] Four threaded holes 1n are provided on the top surface 1i of the system body, which are used for threaded connection with the four countersunk holes 3a of the upper cover 3; mounting surfaces 1j are provided on both sides below the system body 1, and 6 threaded holes 1m are opened on the mounting surface 1j, which are used for threaded connection between the system body 1 and the box body 2; 7 threaded holes are provided on the upper end surface of the box body 2, which are used for connection with the upper cover 3, and the upper cover 3 is provided with an electrical connector outlet 3b.

[0043] A plurality of threaded holes 1n are provided on the top surface 1i of the system body 1 for threaded connection with the countersunk holes 3a corresponding to each threaded hole 1n of the upper cover 3; the upper cover 3 is provided with an electrical connector outlet 3b.

[0044] The compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS accelerator also includes a reinforcement bar 8; wherein the end face 11 of the notch is used to install the reinforcement bar 8, and the reinforcement bar 8 protects the optical fiber and wire passing through the notch 1f, and compensates for the loss of system body stiffness caused by opening the notch.

[0045] The compact fiber optic inertial measurement device based on a 50° single-axis fiber optic gyroscope and a MEMS meter also includes: a pad column Ⅰ10; wherein one end of the pad column Ⅰ10 passes through the first 50° single-axis fiber optic gyroscope 4a and is connected to the system body 1, and the other end of the pad column Ⅰ10 is connected to the signal processing and interface circuit 6.

[0046] The compact fiber optic inertial measurement device based on a 50° single-axis fiber optic gyroscope and a MEMS meter also includes: a pad column II 11; wherein one end of the pad column I 10 passes through the second optical path component 4c-2 of the third 50° single-axis fiber optic gyroscope and is connected to the system body 1, and the other end of the pad column I 10 is connected to the secondary power supply circuit 7.

[0047] The 50 single-axis fiber optic gyroscope 4a is installed on the system body 1 by three screws and a cushion column Ⅰ10, one side of the cushion column Ⅰ10 is a threaded column, and the end face of the other side is provided with a threaded hole; the 50 single-axis fiber optic gyroscope 4b is installed on the system body 1 by four screws; the optical path component 4c-1 of the split 50 single-axis fiber optic gyroscope 4c is installed on the system body 1 by four screws, and the circuit component 4c-2 of the split 50 single-axis fiber optic gyroscope 4c is installed on the system body 1 by three screws and a cushion column Ⅱ11, one side of the cushion column Ⅱ11 is a threaded column, and the end face of the other side is provided with a threaded hole.

[0048] After fixing the 50 single-axis fiber optic gyroscope 4a, the end face of the pad column Ⅰ10 is coplanar with the signal processing and interface circuit mounting surface 1g; after fixing the circuit component 4c-2 of the split 50 single-axis fiber optic gyroscope 4c, the end face of the pad column Ⅱ11 is coplanar with the secondary power supply circuit mounting surface 1h; the signal processing and interface circuit mounting surface 1g and the end face of the pad column Ⅰ10 jointly support the signal processing and interface circuit 6; the secondary power supply circuit mounting surface 1h and the end face of the pad column Ⅱ11 jointly support the secondary power supply circuit 7.

[0049] Specifically, Figure 1 , Figure 2 As shown, the electric connector assembly 9 is composed of an electric connector bracket 9a and an electric connector 9b, and the electric connector assembly 9 is mounted on the electric connector assembly mounting surface 1K of the system body 1. The electric connector assembly mounting surface 1k is located in the middle part of the system body 1 on the opposite side of the gyro optical path assembly mounting surface 1c1. When the electric connector assembly 9 is mounted on the electric connector assembly mounting surface 1k, the end surface of the electric connector 9b is lower than the top surface 1i of the system body 1.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a system body 1 of a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter is provided with a gyroscope mounting surface 1a, a gyroscope mounting surface 1b, a gyroscope optical path component mounting surface 1c1, a gyroscope circuit component mounting surface 1c2, a meter circuit board 5a mounting surface 1d, a meter circuit board 5b mounting surface 1e, a notch 1f, a signal processing and interface circuit mounting surface 1g, a secondary power supply circuit mounting surface 1h, a top surface 1i, a mounting surface 1j, and an electrical connector component mounting surface 1k; a 50 single-axis fiber optic gyroscope 4a is mounted on the gyroscope mounting surface 1a, and a 50 single-axis fiber optic gyroscope 4b is mounted on the gyroscope mounting surface 1c2. The optical path component 4c-1 of the split 50 single-axis fiber optic gyroscope 4c is installed on the gyroscope optical path component installation surface 1c-1, and the circuit component 4c-2 of the split 50 single-axis fiber optic gyroscope 4c is installed on the gyroscope circuit component installation surface 1c-2; after the optical path component 4c-1 and the circuit component 4c-2 of the split 50 single-axis fiber optic gyroscope 4c are installed on their respective installation surfaces, the wires and optical fibers connecting the two pass through the notch 1f of the system body 1, and the end surface 11 of the notch 1f is used to install the reinforcement strip 8, which protects the optical fiber and wire passing through the notch 1f and compensates for the loss of rigidity of the system body caused by opening the notch;

[0051] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the meter circuit board 5a is installed on the meter circuit board 5a mounting surface 1d, and the meter circuit board 5b is installed on the meter circuit board 5b mounting surface 1e. After the meter circuit board 5a and the meter circuit board 5b are installed to the system body 1, the three MEMS meters are sunk into the cavity surrounded by the meter circuit board and the system body, so as to achieve isolation protection for the three MEMS meters.

[0052] like Figure 4 , Figure 5 , Figure 6 As shown, the signal processing and interface circuit mounting surface 1g is three coplanar bosses on the same side of the gyro mounting surface 1a, and a threaded hole is opened in the center of each boss; the secondary power circuit mounting surface 1h is three coplanar bosses on the same side of the gyro circuit component mounting surface 1c-2, and a threaded hole is opened in the center of each boss; four threaded holes 1n are provided on the top surface 1i of the system body for threaded connection with the upper cover 3; mounting surfaces 1j are provided on both sides below the system body 1, and 6 threaded holes 1m are opened on the mounting surface 1j for threaded connection between the system body 1 and the box body 2;

[0053] like Figure 1 As shown, the upper end surface of the box body 2 is provided with 7 threaded holes 2a for connecting with the upper cover 3. The top of the upper cover 3 is provided with four countersunk holes 3a, and the upper cover 3 is provided with an electrical connector outlet 3b;

[0054] like Figure 1 , Figure 2 , Figure 3 As shown, a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter of the present invention, a 50 single-axis fiber optic gyroscope 4a is installed on a system body 1 by three screws and a pad column Ⅰ10, one side of the pad column Ⅰ10 is a threaded column, and the end face of the other side is provided with a threaded hole; a 50 single-axis fiber optic gyroscope 4b is installed on the system body 1 by four screws; an optical path component 4c-1 of the split 50 single-axis fiber optic gyroscope is installed on the system body 1 by four screws, and a circuit component 4c-2 of the split 50 single-axis fiber optic gyroscope is installed on the system body 1 by three screws and a pad column Ⅱ11, one side of the pad column Ⅱ11 is a threaded column, and the end face of the other side is provided with a threaded hole;

[0055] like Figure 2 , Figure 3 , Figure 7As shown, a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter according to the present invention, after the pad column Ⅰ10 fixes the 50 single-axis fiber optic gyroscope 4a, its end face is coplanar with the signal processing and interface circuit mounting surface 1g; after the pad column Ⅱ11 fixes the circuit component 4c-2 of the split 50 fiber optic gyroscope 4c, its end face is coplanar with the secondary power supply circuit mounting surface 1h; the signal processing and interface circuit mounting surface 1g and the end face of the pad column Ⅰ10 jointly support the signal processing and interface circuit 6; the secondary power supply circuit mounting surface 1h and the end face of the pad column Ⅱ11 jointly support the secondary power supply circuit 7. Three 50 single-axis fiber optic gyroscopes, MEMS adding meter component 5, signal processing and interface circuit 6, secondary power supply circuit 7, reinforcement strip 8, electrical connector component 9, pad column I 10, and pad column II 11 are all installed on the system body 1 to form the core of the fiber optic inertial measurement device. The core of the fiber optic inertial measurement device is fixed in the inner cavity of the box body 2 using 6 screws. The 6 screws pass through the bottom through holes of the box body 2 and are threadedly connected with the 6 threaded holes 1m on the body. The upper cover 3 is installed above the box body 2, and the upper cover 3 is threadedly connected to the box body 2 using 7 pan head screws. Four countersunk screws are used to pass through the 4 countersunk holes 3a of the upper cover 3 and are threadedly connected with the 4 threaded holes 1n corresponding to the system body 1 to realize the assembly of the entire fiber optic inertial measurement device.

[0056] like Figure 8 , Fig. 9 As shown, a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope and a MEMS meter of the present invention has a circumferential envelope of 80.8 mm for an integrated 50 single-axis fiber optic gyroscope and an optical path component when the interval is 4 mm, and can be easily placed in a circle with a diameter of 90 mm. However, the circumferential envelope of two integrated 50 single-axis fiber optic gyroscopes when the interval is 1.5 mm has reached 94.8 mm, and cannot be arranged in a circle with a diameter of 90 mm. Therefore, the design scheme provided by the present invention can greatly improve the internal space utilization of the fiber optic inertial measurement device and significantly reduce the volume and weight of the fiber optic inertial measurement device.

[0057] The present invention designs a compact fiber optic inertial measurement device based on a 50 single-axis fiber optic gyroscope with an overall size of 50×50×32 (mm) and a MEMS meter.

[0058] The purpose of the present invention is to utilize the existing mature 50 single-axis fiber optic gyroscope to design a fiber optic inertial measurement device with a smaller volume and lighter weight to the maximum extent, so as to meet the application occasions with strict requirements on installation space and weight, and to improve the application scope of the fiber optic inertial measurement device. In order to achieve the design goal, the 50 single-axis fiber optic gyroscope selected by the present invention is designed and developed by Beijing Aerospace Times Optoelectronics Technology Co., Ltd. This 50 single-axis fiber optic gyroscope is a photoelectric separation design, that is, the fiber optic gyroscope can be split into an optical path component and a circuit component, which are connected by optical fibers and wires. After the optical path component and the circuit component are connected by screws, it is an integrated 50 single-axis fiber optic gyroscope. The used 50 single-axis fiber optic gyroscope has an outer dimension of 50×50×32 (mm), wherein the optical path component has an outer dimension of 50×50×13.4 (mm), and the circuit component has an outer dimension of 50×50×18.6 (mm); three integrated 50 single-axis fiber optic gyroscopes with an outer dimension of 50×50×32 (mm) cannot be arranged within a circle with a diameter of 90 mm. The present invention adopts a solution of separately installing one of the three integrated 50 single-axis fiber optic gyroscopes to realize the arrangement of the three 50 single-axis fiber optic gyroscopes within a circle with a diameter of 90 mm, thereby greatly reducing the volume and weight of the fiber optic inertial measurement device.

[0059] In the present invention, the signal processing and interface circuit and the secondary power supply circuit are respectively installed on both sides of the system body, and the two are far away from each other, which is conducive to the uniformity of the temperature field of the whole machine and also reduces the electromagnetic signal interference between different circuit boards in the optical fiber inertial measurement device.

[0060] In order to reduce the volume and weight of the fiber optic inertial measurement device to the maximum extent, the system body structure of the present invention is weak and the rigidity is low, which has an adverse effect on the performance of the fiber optic gyroscope under a large-scale vibration environment. To compensate for this defect, the present invention uses a rigidity compensation design, that is, the body and the upper cover are rigidly connected by four screws, and the upper cover and the box are rigidly connected by seven screws. After the system body is rigidly connected to the upper cover and the box, the box and the upper cover play a role in rigidity compensation for the system body. At the same time, the system body is rigidly connected to the upper cover and the box, which increases the heat dissipation path of the inertial measurement device kernel. The upper surface of the system body can transfer the heat generated by the three 50 single-axis fiber optic gyroscopes, the signal processing and interface circuit, and the secondary power supply circuit to the box through the upper cover, and the box transfers the heat to the external device.

[0061] In the present invention, the meter assembly includes two circuit boards connected by a flexible line, two MEMS meters are orthogonally mounted on one circuit board, and one MEMS meter is mounted on the other circuit board. The two circuit boards are fixed to mutually orthogonal meter assembly mounting surfaces on the system body, so that the three MEMS meters are orthogonal to each other. The use of MEMS meters further reduces the volume, weight, and power consumption of optical fiber inertial measurement.

[0062] In the present invention, the core of the optical fiber inertial measurement device is independent of the box and the upper cover. The software code of the optical fiber inertial measurement device is burned by welding the electrical connector of the signal processing and interface circuit. The box and the upper cover of the optical fiber inertial measurement device can be removed during the burning process. After the software code is burned and various adjustments and tests are completed, the box and the upper cover are used to encapsulate the core of the optical fiber inertial measurement device, avoiding the need to repeatedly disassemble the upper cover and the box during the burning process and various adjustments, thereby improving the system adjustment and testing efficiency. In some occasions with smaller vibration levels and more stringent requirements on the installation space, the box and the upper cover of the optical fiber inertial measurement device can be directly removed, and only the core of the optical fiber inertial measurement device is connected to the user's mechanical interface.

[0063] The 50 single-axis fiber optic gyroscope used in the present invention is formed by connecting an optical path component and a circuit component through screws. The screws connecting the optical path component and the circuit component can be removed to obtain a split 50 single-axis fiber optic gyroscope. The MEMS meter component used in the present invention is composed of three MEMS meters and two meter circuit boards, one meter circuit board is orthogonally mounted with two MEMS meters, and the other meter circuit board is mounted with one MEMS meter. The two meter circuit boards are connected as a whole through a flexible line. When the two meter circuit boards are orthogonally mounted on the system body, the three MEMS meters are orthogonal in pairs. In order to realize the compact structure of the fiber optic inertial measurement device, one of the three 50 single-axis fiber optic gyroscopes is split in the present invention to obtain an optical path component and a circuit component, and then the optical path components of the two unsplit 50 single-axis fiber optic gyroscopes and one split 50 single-axis gyroscope are orthogonally installed on three orthogonal installation surfaces of the system body; the present invention has the advantages of compact structure, good heat dissipation, good assembly processability, easy maintenance, no interference between sensitive axes, etc., and the core part of the fiber optic measurement device is independent of the box and the upper cover. In occasions where the volume and weight requirements are more stringent, the box and the upper cover can be removed, and the core of the fiber optic measurement device can be used alone for system integration.

[0064] The present invention makes the structure size of the core of the fiber optic inertial measurement device more compact by installing two integrated 50 single-axis fiber optic gyroscopes and one split 50 single-axis fiber optic gyroscope on the system body, greatly reducing the volume and weight of the fiber optic inertial measurement device; the present invention improves the system integration and assembly processability by installing three MEMS accelerometers on two circuit boards and connecting the two circuit boards with flexible wires; the core of the fiber optic inertial measurement device of the present invention is independent of the box body and the upper cover, and the user can remove the box body and the upper cover to use the core of the fiber optic inertial measurement device alone in applications with demanding installation space; the fiber optic inertial measurement device of the present invention uses a 50 single-axis fiber optic gyroscope for assembly, and does not require optical path welding, which reduces the skill requirements for assembly personnel, reduces the production threshold, and improves production efficiency; the rectangular flat plate of the electrical connector socket of the present invention is 12 mm lower than the upper surface of the upper cover, and the user's electrical connection After the connector plug is docked with it, the user electrical connector plug is also lower than the upper surface of the upper cover, further saving installation space for the user; the present invention uses a scheme combining an integrated single-axis fiber optic gyroscope with a split single-axis fiber optic gyroscope to design a fiber optic inertial measurement device, achieving better assembly and better maintainability than a three-axis integrated fiber optic gyroscope, achieving a smaller outer size than using three integrated single-axis fiber optic gyroscopes, eliminating signal interference between the sensitive axes of the three-axis integrated gyroscope scheme, and concentrating the advantages of the two; in the present invention, the signal processing and interface circuit and the secondary power supply circuit are installed on both sides of the core of the fiber optic inertial measurement device, avoiding mutual interference between the power supply and the signal; in the present invention, the upper cover is rigidly connected to both the system body and the box body, improving the overall rigidity of the fiber optic inertial measurement device, increasing the heat dissipation channel of the active heating device, and realizing a lightweight design of the system body.

[0065] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A compact fiber optic inertial measurement device based on a 50-axis fiber optic gyroscope and a MEMS meter, characterized in that include: A system body (1), a box (2), an upper cover (3), a first 50 single-axis fiber optic gyroscope (4a), a second 50 single-axis fiber optic gyroscope (4b), a third 50 single-axis fiber optic gyroscope, a MEMS adding component, a signal processing and interface circuit (6), a secondary power supply circuit (7) and an electrical connector component (9); wherein: The system body (1) is arranged inside the box (2); The upper cover (3) is connected to the open end of the box body (2); The first 50 single-axis fiber optic gyroscope (4a), the second 50 single-axis fiber optic gyroscope (4b), the third 50 single-axis fiber optic gyroscope (4c), the MEMS adding component, the signal processing and interface circuit (6), the secondary power supply circuit (7) and the electrical connector component (9) are all arranged on the system body (1).

2. The compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter according to claim 1 is characterized in that: The MEMS metering component comprises a first metering circuit board (5a) and a second metering circuit board (5b); wherein: A MEMS meter is mounted on the first meter circuit board (5a); two MEMS meters are orthogonally mounted on the second meter circuit board (5b); the meter circuit board (5a) and the meter circuit board (5b) are connected by a flexible line; the first meter circuit board (5a) and the second meter circuit board (5b) are orthogonally mounted on the system body (1).

3. The compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter according to claim 1 is characterized in that: The electrical connector assembly (9) comprises an electrical connector bracket (9a) and an electrical connector (9b); wherein: The electrical connector (9b) is arranged on the electrical connector bracket (9a); The electrical connector bracket (9a) is installed on the system body (1).

4. The compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter according to claim 2, characterized in that: The system body (1) comprises a first gyro mounting surface (1a), a second gyro mounting surface (1b), a first gyro optical path component mounting surface (1c-1), a second gyro circuit component mounting surface (1c-2), a first plus circuit board mounting surface (1d), a second plus circuit board mounting surface (1e), a notch (1f), a signal processing and interface circuit mounting surface (1g), a secondary power supply circuit mounting surface (1h), a top surface (1i), an external mounting surface (1j) and an electrical connector component mounting surface (1k); wherein: The first gyro mounting surface (1a) is used for mounting a first 50° single-axis fiber optic gyroscope (4a), and the second gyro mounting surface (1b) is used for mounting a second 50° single-axis fiber optic gyroscope (4b); The first gyro optical path component mounting surface (1c-1) is used to mount the first optical path component (4c-1) of the third 50 single-axis fiber optic gyroscope, the second gyro circuit component mounting surface (1c-2) is used to mount the second optical path component (4c-2) of the third 50 single-axis fiber optic gyroscope, and the wire and optical fiber connecting the first optical path component (4c-1) and the second optical path component (4c-2) pass through the notch (1f) on the system body (1); The first adding circuit board mounting surface (1d) is used for mounting a first adding circuit board (5a), and the second adding circuit board mounting surface (1e) is used for mounting a second adding circuit board (5b); The signal processing and interface circuit mounting surface (1g) is used to mount the signal processing and interface circuit (6); the signal processing and interface circuit mounting surface (1g) and the first gyroscope mounting surface (1a) are located on the same side; and the signal processing and interface circuit (6) is located outside the first 50 single-axis fiber optic gyroscope (4a); The secondary power circuit mounting surface (1h) is used to mount the secondary power circuit (7); the secondary power circuit mounting surface (1h) and the second gyro circuit assembly mounting surface (1c-2) are located on the same side; and the secondary power circuit (7) is located outside the second optical path assembly (4c-2); The electrical connector component mounting surface (1k) is used to mount the electrical connector component (9), and the electrical connector component mounting surface (1k) is located in the middle of the system body (1) on the opposite side of the gyro optical path component mounting surface (1c1).

5. The compact fiber-optic inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS meter according to claim 4 is characterized in that: A plurality of threaded holes (1n) are provided on the top surface (1i) of the system body (1) for threaded connection with the upper cover (3).

6. The compact fiber-optic inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS meter according to claim 4, characterized in that: A plurality of second threaded holes (1m) are provided on the external mounting surface (1j) at the bottom of the system body (1) for threaded connection with the box body (2).

7. The compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter according to claim 4 is characterized in that It also includes a reinforcement strip (8); wherein the end surface (11) of the notch is used to install the reinforcement strip (8), and the reinforcement strip (8) protects the optical fiber and the wire passing through the notch (1f).

8. The compact fiber-optic inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS meter according to claim 1 is characterized in that Also includes: Pad column I (10); wherein, One end of the pad column I (10) passes through the first 50 single-axis fiber optic gyroscope (4a) and is connected to the system body (1), and the other end of the pad column I (10) is connected to the signal processing and interface circuit (6).

9. The compact fiber optic inertial measurement device based on 50 single-axis fiber optic gyroscope and MEMS meter according to claim 1 is characterized in that Also includes: Pad column II (11); wherein, One end of the cushion column I (10) passes through the second optical path component (4c-2) of the third 50 single-axis fiber optic gyroscope and is connected to the system body (1), and the other end of the cushion column I (10) is connected to the secondary power supply circuit (7).

10. The compact fiber-optic inertial measurement device based on 50 single-axis fiber-optic gyroscope and MEMS meter according to claim 5, characterized in that: A plurality of threaded holes (1n) are provided on the top surface (1i) of the system body (1) for threaded connection with the countersunk holes (3a) corresponding to each threaded hole (1n) of the upper cover (3); the upper cover (3) is provided with an electrical connector outlet (3b).

Images