阅读说明：本技术 一种光纤陀螺用阶梯波电路与y波导一体化结构 (Step wave circuit and Y waveguide integrated structure for fiber-optic gyroscope ) 是由 程文明 王浩 魏振兴 叶飞 耿铭 万黎明 邵宏达 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种光纤陀螺用阶梯波电路与Y波导一体化结构,包括陀螺本体(1),陀螺本体(1)上设有安装槽(2),安装槽(2)内设有Y波导器件(3),Y波导器件(3)侧面设有安装柱(4),安装柱(4)上方设有位于Y波导器件(3)上方的Y波导驱动板(5),且Y波导器件(3)的引脚经焊接方式与Y波导驱动板(5)相连；所述Y波导驱动板(5)上方设有信号板(6),Y波导驱动板(5)经挠性电路板(7)与信号板(6)相连；信号板(6)上方设有与陀螺本体(1)相配合的陀螺上盖(8)。本发明具有能够有效提高光纤陀螺精度的特点。(The invention discloses a stepped wave circuit and Y waveguide integrated structure for an optical fiber gyroscope, which comprises a gyroscope body (1), wherein a mounting groove (2) is formed in the gyroscope body (1), a Y waveguide device (3) is arranged in the mounting groove (2), a mounting column (4) is arranged on the side surface of the Y waveguide device (3), a Y waveguide drive plate (5) positioned above the Y waveguide device (3) is arranged above the mounting column (4), and a pin of the Y waveguide device (3) is connected with the Y waveguide drive plate (5) in a welding mode; a signal plate (6) is arranged above the Y waveguide driving plate (5), and the Y waveguide driving plate (5) is connected with the signal plate (6) through a flexible circuit board (7); a top cover (8) matched with the top body (1) is arranged above the signal plate (6). The invention has the characteristic of effectively improving the precision of the fiber-optic gyroscope.)

1. The utility model provides a ladder wave circuit and Y waveguide integral structure for fiber-optic gyroscope which characterized in that: the gyroscope comprises a gyroscope body (1), wherein a mounting groove (2) is formed in the gyroscope body (1), a Y waveguide device (3) is arranged in the mounting groove (2), a mounting column (4) is arranged on the side surface of the Y waveguide device (3), a Y waveguide drive plate (5) positioned above the Y waveguide device (3) is arranged above the mounting column (4), and a pin of the Y waveguide device (3) is connected with the Y waveguide drive plate (5) in a welding mode; a signal plate (6) is arranged above the Y waveguide driving plate (5), and the Y waveguide driving plate (5) is connected with the signal plate (6) through a flexible circuit board (7); a top cover (8) matched with the top body (1) is arranged above the signal plate (6).

2. The integrated structure of the step wave circuit and the Y waveguide for the fiber-optic gyroscope according to claim 1, characterized in that: the Y waveguide driving board (5) comprises a circuit printed board (501), a DA chip (502) and a differential operational amplifier chip (503) which are sequentially arranged are arranged on the upper surface of the circuit printed board (501), two first resistors (504) which are symmetrically distributed are further arranged between the DA chip (502) and the differential operational amplifier chip (503), a second resistor (505) is arranged between each first resistor (504) and the DA chip (502), and the two second resistors (505) are symmetrically distributed; and two third resistors (506) which are symmetrically distributed are also arranged on the differential operational amplifier chip (503).

3. The integrated structure of the step wave circuit and the Y waveguide for the fiber-optic gyroscope according to claim 2, characterized in that: the DA chip (502) is also provided with a connector (507) used for connecting with the flexible circuit board (7).

4. The integrated structure of the step wave circuit and the Y waveguide for the fiber-optic gyroscope according to claim 1, characterized in that: and a metal sealing layer is arranged outside the Y waveguide device (3) and the Y waveguide driving board (5).

Technical Field

The invention relates to an optical fiber gyroscope, in particular to a step wave circuit and Y waveguide integrated structure for the optical fiber gyroscope.

Background

In the design of the fiber-optic gyroscope, the processing mode of the Y waveguide directly influences a series of indexes such as a dead zone, zero-offset stability and the like of the fiber-optic gyroscope. In the conventional design, since the Y waveguide device belongs to a photoelectric device, the device layout is generally tightly combined with the optical fiber ring and is far away from the circuit driving circuit, the circuit main board and the Y waveguide are generally connected by a twisted pair, and some fiber optic gyroscope manufacturers drive the Y waveguide by shielding the twisted pair in order to further prevent the Y waveguide from being interfered by the outside. However, in any way, it is inevitable to connect the motherboard driving circuit and the Y waveguide by using a wire. Because a waveguide line exists between the main board driving circuit and the Y waveguide, the length of the general waveguide line is about 5cm, and the longest waveguide line is up to 30 cm; in the optical fiber inertial measurement unit with the three integrated shafts, the distance between the optical fiber ring and the circuit main board is larger, so that the length of the waveguide line is larger, and the waveguide line is more easily interfered by the outside. For the fiber optic gyroscope, the disadvantages of the current scheme that the driving circuit is separated from the Y waveguide are: the Y waveguide driving circuit is separated from the Y waveguide device, the driving circuit is connected with the Y waveguide in the modes of twisted pairs, shielding wires and the like, and the actual engineering practice of the optical fiber gyroscope shows that the quality of the Y waveguide wire determines the precision of the optical fiber gyroscope, the optical fiber gyroscope is directly influenced, and the precision of the optical fiber gyroscope is reduced. Therefore, the prior art has the problem that the precision of the fiber-optic gyroscope is easily influenced.

Disclosure of Invention

The invention aims to provide a step wave circuit and Y waveguide integrated structure for a fiber-optic gyroscope. The invention has the characteristic of effectively improving the precision of the fiber-optic gyroscope.

The technical scheme of the invention is as follows: a ladder wave circuit and Y waveguide integrated structure for an optical fiber gyroscope comprises a gyroscope body, wherein a mounting groove is formed in the gyroscope body, a Y waveguide device is arranged in the mounting groove, a mounting column is arranged on the side surface of the Y waveguide device, a Y waveguide drive board positioned above the Y waveguide device is arranged above the mounting column, and a pin of the Y waveguide device is connected with the Y waveguide drive board in a welding mode; a signal plate is arranged above the Y waveguide driving plate, and the Y waveguide driving plate is connected with the signal plate through a flexible circuit board; a top cover matched with the top body is arranged above the signal plate.

In the step wave circuit and Y waveguide integrated structure for the fiber-optic gyroscope, the Y waveguide drive board comprises a circuit printed board, the upper surface of the circuit printed board is provided with a DA chip and a differential operational amplifier chip which are sequentially arranged, two first resistors which are symmetrically distributed are further arranged between the DA chip and the differential operational amplifier chip, a second resistor is arranged between each first resistor and the DA chip, and the two second resistors are symmetrically distributed; and two third resistors which are symmetrically distributed are also arranged on the differential operational amplifier chip.

In the aforementioned step wave circuit and Y waveguide integrated structure for an optical fiber gyroscope, the DA chip is further provided with a connector for connecting to a flexible circuit board.

In the step wave circuit and Y waveguide integrated structure for the fiber-optic gyroscope, the Y waveguide device and the Y waveguide driving board are provided with a metal sealing layer.

Compared with the prior art, the Y waveguide driving circuit is integrated above the Y waveguide device, miniaturized and tightly combined with the Y waveguide, and a Y waveguide line in the original fiber-optic gyroscope is eliminated, so that the distance of a lead of the Y waveguide can be reduced to the greatest extent, the distance between the driving circuit and a Y waveguide electrode is only 0mm, the interference can be reduced, the precision of the fiber-optic gyroscope is improved, the output characteristic of the fiber-optic gyroscope is improved, and the qualification rate of products is improved. Meanwhile, because the Y waveguide electrode is an analog differential signal, in order to guarantee the performance of the Y waveguide to the maximum, when a current signal from the DA chip passes through a device behind, the layout adopts a completely symmetrical technology (the first resistor, the second resistor and the third resistor are symmetrically distributed), the wiring completely adopts a symmetrical technology, and all devices are completely symmetrical. By adopting the technical scheme of the invention, the precision problem of the optical fiber gyroscope caused by unreasonable design of the Y waveguide line can be obviously reduced, the precision of the optical fiber gyroscope is improved, the qualification rate of the optical fiber gyroscope is improved, and the production cost is reduced; the method has good inhibition measures for solving the problems of output distortion, oscillation, large dead zone and the like in the optical fiber gyroscope. In conclusion, the invention has the characteristic of effectively improving the precision of the fiber-optic gyroscope.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a circuit schematic of a Y waveguide driver board;

FIG. 3 is a block diagram of a Y waveguide driver board;

FIG. 4 is a graph of a test of a fiber optic gyroscope with a disturbance condition;

fig. 5 is a test curve diagram of the fiber-optic gyroscope adopting the technical scheme of the invention.

The labels in the figures are: the gyroscope comprises a 1-gyroscope body, a 2-mounting groove, a 3-Y waveguide device, a 4-mounting column, a 5-Y waveguide driving board, a 6-signal board, a 7-flexible circuit board, an 8-gyroscope upper cover, a 501-circuit printed board, a 502-DA chip, a 503-differential operational amplifier chip, a 504-first resistor, a 505-second resistor, a 506-third resistor and a 507-connector.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. A ladder wave circuit and Y waveguide integrated structure for an optical fiber gyroscope is formed as shown in figures 1 to 3 and comprises a gyroscope body 1, wherein a mounting groove 2 is formed in the gyroscope body 1, a Y waveguide device 3 is arranged in the mounting groove 2, a mounting column 4 is arranged on the side face of the Y waveguide device 3, a Y waveguide drive board 5 located above the Y waveguide device 3 is arranged above the mounting column 4, and a pin of the Y waveguide device 3 is connected with the Y waveguide drive board 5 in a welding mode; a signal plate 6 is arranged above the Y waveguide driving plate 5, and the Y waveguide driving plate 5 is connected with the signal plate 6 through a flexible circuit board 7; a top cover 8 matched with the top body 1 is arranged above the signal plate 6.

The Y waveguide driving board 5 comprises a circuit printed board 501, a DA chip 502 and a differential operational amplifier chip 503 which are sequentially arranged are arranged on the upper surface of the circuit printed board 501, two first resistors 504 which are symmetrically distributed are further arranged between the DA chip 502 and the differential operational amplifier chip 503, a second resistor 505 is arranged between each first resistor 504 and the DA chip 502, and the two second resistors 505 are symmetrically distributed; two third resistors 506 which are symmetrically distributed are further arranged on the differential operational amplifier chip 503.

The DA chip 502 is also provided with a connector 507 for connection to the flexible circuit board 7.

And a metal sealing layer is arranged outside the Y waveguide device 3 and the Y waveguide driving board 5.

Since the size of the Y waveguide device is 30mm × 8mm × 5mm, the step wave driving circuit (Y waveguide driving circuit) needs to be designed at 30mm × 8 mm. As shown in fig. 2, the step wave driving circuit used in the fiber optic gyroscope is shown, and the filter capacitor and the decoupling capacitor are omitted in fig. 2. The circuit of fig. 2 is microsystemed, and a Y waveguide driving circuit and a Y waveguide are designed in an integrated manner. Firstly, the circuit is arranged on a 30mm × 8mm printed board, and on the basis of following the general printed board arrangement rule, a bare chip is required to be arranged, and the final arrangement effect is shown in fig. 3:

the driving electrodes of the Y waveguide are directly connected through two holes of JB1 and JB 2; the circuit of fig. 2 is connected with the signal board by a flexible circuit board. Meanwhile, in order to achieve the best effect, the following improvements are made:

1. the devices on the circuit board are distributed completely symmetrically:

since the Y waveguide electrode is an analog differential signal, in order to ensure the performance of the Y waveguide to the maximum, when the current signal from the DA passes through the following devices (each resistor), a completely symmetrical technology is adopted in the layout, and a completely symmetrical technology is adopted in the wiring, as shown in fig. 3, all the devices are completely symmetrical up and down with respect to the board.

2. Adopts the technology of resistance burying and capacitance burying: because the size of the printed board is limited, and because the Y waveguide device is arranged below the printed board, the devices cannot be arranged on the back surface of the printed board, meanwhile, filtering decoupling capacitors are needed for DA chips and differential operational amplifier chips in the figure, and peripheral configuration circuits are needed outside the DA chips, so that a buried resistor and capacitor technology is adopted, the resistor and capacitor which do not need to be adjusted are buried in the middle layer of the printed board, and the volume of the printed board is saved.

3. Electromagnetic shielding: in order to further prevent the Y waveguide device and the Y waveguide driving circuit board from being interfered by the outside, the components in fig. 1 are finally sealed by metal to form a Y waveguide circuit component, so as to prevent the components from being affected by the outside electromagnetism, humidity and the like.

After the Y waveguide assembly is packaged, the Y waveguide assembly is installed in the optical fiber gyroscope, the Y waveguide circuit assembly is connected with the circuit main board through the connector by adopting the flexible circuit board, and the specific implementation steps are as follows

1) Installing the Y waveguide device on the gyroscope body, and bending the pin of the Y waveguide device upwards;

2) fixing the Y waveguide device by using a mounting column;

3) installing a Y waveguide driving board above the installation column, and welding a pin of a Y waveguide device on the Y waveguide driving board;

4) the signal board is connected with the Y waveguide driving board through the flexible circuit board, and reliability is guaranteed.

5) Through the pin beading with Y waveguide device on Y waveguide drive plate, shorten the distance between modulation signal to the Y waveguide to direct action is on the Y waveguide, makes the analog modulation signal that the drive plate sent be difficult to receive external disturbance, has guaranteed fiber optic gyroscope's modulation stability, and the signal of transmission between Y waveguide drive plate and the signal board is digital signal in addition, is difficult for receiving environmental disturbance, can not cause harmful effects because of the interplate separation. Meanwhile, the stability of the circuit board can be ensured by connecting the flexible circuit board and the printed circuit board.

The Y waveguide driving circuit in the figure is skillfully integrated on a Y waveguide device, and the circuit is miniaturized by adopting a micro-process method and is tightly combined with a Y waveguide for design, so that the final purpose is to cancel a Y waveguide line in the original fiber-optic gyroscope. Therefore, the precision of the fiber-optic gyroscope is improved, the output characteristic of the fiber-optic gyroscope is improved, and the qualification rate of products is improved.

The applicant selects a gyroscope with interference condition to carry out comparison test, when the traditional scheme is used, the gyroscope generates obvious interference phenomenon in the test process, and the gyroscope is determined to be caused by interference of the waveguide line through analysis, and a test curve graph 4 of the gyroscope is shown; under the condition that other states are not changed, after the circuit integrally designed by the scheme is used, the catastrophe points caused by signal interference obviously disappear, the performance index of the gyroscope is obviously improved, and the test curve is shown in figure 5. After the technical scheme is used, the zero-offset stability of the gyroscope is improved to 0.15 DEG/h from the original 0.21 DEG/h, the product performance and stability are improved, in addition, sudden change is caused by interference, the reliability fault of a rear-end navigation product is brought to the product in the using process, and the scheme can provide higher stability and reliability for the product after the signal interference is effectively eliminated.