A modular digital laser gyroscope considering thermal balance

Abstract

This utility model belongs to the field of inertial measurement technology, and particularly relates to a modular digital laser gyroscope considering thermal balance. It includes: a cover plate, a gyroscope control circuit, a heat spreader, a ring laser sensor, and a base; the heat spreader is disposed between the gyroscope control circuit and the ring laser sensor; the ring laser sensor is fixedly connected to the lower surface of the heat spreader; the gyroscope control circuit is fixedly connected to the upper surface of the heat spreader; the heat spreader is fixedly connected to the base around its perimeter; the cover plate is located above the gyroscope control circuit and fixedly connected to the base; the heat generated by the gyroscope control circuit is transferred upwards to the cover plate via heat conduction, and downwards to the base via fastening screws; the cover plate and the base exchange heat through thermal convection with the outside air.

Description

Technical Field

[0001] This invention belongs to the field of inertial measurement technology, and particularly relates to a modular digital laser gyroscope that takes thermal balance into account. Background Technology

[0002] Laser gyroscopes based on the Sagnac effect, as angle measurement devices, have been widely used in various inertial navigation systems in aviation, aerospace, and maritime fields. Traditional inertial navigation systems (IMUs) only integrate the optical body of the laser gyroscope. In recent years, miniaturization and modularization have become important directions in the development of standard navigation systems. In particular, with the mass use of miniaturized carriers such as UAVs, the demand for miniaturization and lightweighting is becoming increasingly urgent. The key lies in reducing the size and weight of the gyroscope. Due to the size effect, the margin for reducing the optical path length of the laser gyroscope is small. Therefore, a digital laser gyroscope is proposed.

[0003] Laser strapdown inertial navigation systems (INS) with digital laser gyroscopes as the core sensor are directly fixed to the carrier, eliminating the need for complex mechanical platforms. They directly output gyroscope pulse information without user control, facilitating system integration. Consequently, the INS is small, lightweight, and highly reliable. Furthermore, its direct digital pulse output, eliminating the need for A / D conversion, makes it a primary inertial angle measurement device for precise navigation and strike capabilities in modern high-tech warfare. A digital laser gyroscope (DLG) mainly comprises a ring laser sensor, gyroscope control circuitry, and a packaging structure. Currently, the primary engineering implementation integrates the gyroscope control circuitry and the ring laser sensor into the same package. However, with the increasing demand for miniaturization in INS, gyroscope packaging structures are becoming more compact. Furthermore, the requirements for domestic development have led to a significant increase in the power consumption and heat generation of electronic components, especially chips. This makes heat dissipation a key factor restricting the rapid start-up characteristics and accuracy improvement of digital laser gyroscopes. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a modular digital laser gyroscope structure layout that takes into account thermal balance, thereby effectively suppressing the influence of the internal temperature gradient of the gyroscope on the accuracy of the gyroscope caused by the high power consumption of the gyroscope control circuit, and at the same time accelerating the internal thermal balance of the gyroscope by optimizing the heat dissipation path, thus significantly shortening the thermal balance time.

[0005] The technical solution of this utility model: a modular digital laser gyroscope considering thermal balance, comprising:

[0006] 1. Cover plate; 3. Gyroscope control circuit; 6. Heat spreader; 7. Ring laser sensor; and 8. Base.

[0007] The heat spreader 6 is disposed between the gyroscope control circuit 3 and the ring laser sensor 7; and the ring laser sensor 7 is fixedly connected to the lower surface of the heat spreader 6; and the gyroscope control circuit 3 is fixedly connected to the upper surface of the heat spreader 6.

[0008] The heat spreader 6 is fixedly connected to the base 8 on all four sides; the cover plate 1 is located above the gyroscope control circuit 3 and is fixedly connected to the base 8.

[0009] The heat generated by the gyroscope control circuit 3 is transferred upward to the cover plate 1 through heat conduction, and downward to the base 8 through the fastening screw 4. The cover plate 1 and the base 8 exchange heat through heat convection with the outside air.

[0010] Furthermore, it also includes: shim column 5;

[0011] The pad 5 is located between the gyroscope control circuit 3 and the heat spreader 6, and is used to support the gyroscope control circuit 3; the gyroscope control circuit 3, the pad 5, the heat spreader 6 and the base 8 are fixed together by fastening screws 4, forming a downward heat conduction path.

[0012] Furthermore, a heat-conducting boss 11 is provided on the cover plate 1. The horizontal position distribution of the heat-conducting boss 11 is consistent with the position distribution of the high-power devices of the gyroscope control circuit 3. The height setting of the heat-conducting boss 11 needs to ensure that there is a gap between the heat-conducting boss 11 and the high-power devices of the gyroscope control circuit 3 for placing the heat-conducting filling material 2.

[0013] Furthermore, anisotropic materials are attached to the top and bottom of the ring laser sensor 7;

[0014] The horizontal thermal conductivity of the anisotropic material is greater than its Z-axis thermal conductivity.

[0015] Furthermore, the heat spreader 6 is provided with threaded through holes for fastening screws 4 to pass through, and a wiring groove 61 is designed on the front side for constraining the signal wire bundle of the ring laser sensor 7. The heat spreader 6 has a planar structure.

[0016] Furthermore, the inner and outer surfaces of the cover plate 1, the base 8, and the heat spreader 6 are all black.

[0017] Furthermore, the thickness of the heat spreader 6 is 4mm to 8mm, and the thickness of the cover plate 1 and the base 8 is 0.5mm to 1.5mm.

[0018] The beneficial effects of this utility model are as follows: 1. The modular digital laser gyroscope considering thermal balance proposed in this utility model adds a heat-spreading structure between the gyroscope control circuit and the ring laser gyroscope sensor. By mounting the ring laser sensor on the heat-spreading plate, the cover plate and base can be made lighter. The overall structure is simple, easy to install, has good manufacturability, and is conducive to weight reduction. 2. The addition of heat-conducting bosses and heat-conducting filling material between the gyroscope control circuit and the cover plate forms an upward heat conduction channel, and the addition of fastening screws and washers between the gyroscope control circuit and the base forms a downward heat conduction channel. This can significantly improve the effect of uneven thermal field distribution of the gyroscope control circuit and large temperature gradient on the gyroscope, and can significantly improve the performance of the gyroscope. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the utility model;

[0020] Where 1 represents the cover plate, 2 represents the thermally conductive filling material, 3 represents the gyroscope control circuit, 4 represents the screw, 5 represents the pad, 6 represents the heat spreader, 7 represents the ring laser sensor, and 8 represents the base.

[0021] Figure 2 This is a schematic diagram of the assembly of the heat spreader 6 and the ring laser sensor of this utility model.

[0022] 61 represents the wiring channel.

[0023] Figure 3 This is a schematic diagram of the structure of the ring laser sensor 7 of this utility model;

[0024] 71 represents anisotropic materials.

[0025] Figure 4 This is a schematic diagram of the cover plate of the utility model;

[0026] 11 represents a heat-conducting boss. Detailed Implementation

[0027] This invention provides a modular digital laser gyroscope considering thermal balance, mainly comprising a cover plate, a gyroscope control circuit, a heat spreader, a ring laser sensor, and a base. The primary heat source in the digital laser gyroscope is the gyroscope control circuit. Since the ring laser sensor is highly sensitive to temperature change rates and easily affected by temperature gradients and temperature equilibrium times, it is necessary to transfer the heat generated by the gyroscope control circuit upwards to the cover plate via heat conduction, and downwards through the gyroscope control circuit printed circuit board and fastening screws to the base. The cover plate and base exchange heat with the outside air via thermal convection. Furthermore, to reduce the impact of uneven temperature field distribution generated by the gyroscope control circuit on the performance of the ring laser sensor, a heat spreader is designed between the gyroscope control circuit and the ring laser, effectively isolating and encapsulating the gyroscope control circuit and the ring laser sensor in different spaces.

[0028] The base has threaded mounting holes on its inner side for mounting a heat spreader plate;

[0029] The ring laser sensor is located between the base and the heat spreader, and is fixed to the heat spreader by a special shaking screw;

[0030] Furthermore, the ring laser sensor is attached with anisotropic material on its top and bottom. This material has high horizontal thermal conductivity and low Z-axis thermal conductivity, which can quickly dissipate the local heat generated by heat convection through the heat spreader and eliminate the local heat generated by the heating of the ring laser sensor's own electrodes, so that the ring laser sensor 7 can quickly reach thermal equilibrium.

[0031] The heat spreader is located between the ring laser sensor and the gyroscope control circuit. It is connected to the base by fastening screws and mainly plays the role of heat spreader, so as to achieve rapid and uniform heat distribution and reduce the impact of uneven temperature field distribution on gyroscope performance.

[0032] Furthermore, the heat spreader is made of a metal material with high thermal conductivity, such as aluminum plate, with a thickness between 3mm and 8mm. At the same time, the anti-vibration performance of the gyroscope needs to be considered, and the results are determined through thermal and mechanical simulations.

[0033] Furthermore, the heat spreader is provided with threaded through holes for fastening screws to pass through, and a wiring groove is designed on the front to constrain the signal bundle of the ring laser sensor. The heat spreader has a planar structure, which facilitates wiring and electrical assembly by operators and can effectively improve assembly efficiency.

[0034] Furthermore, since the heat spreader has already played a load-bearing role, the thickness of the cover plate 1 and the base can be appropriately reduced, generally between 1mm and 3mm. This solution can effectively reduce the weight of the gyroscope.

[0035] The gyroscope control circuit is located above the heat spreader. The gyroscope control circuit includes loops for frequency stabilization control, current stabilization control, jitter control, and readout signal demodulation. The gyroscope control circuit should use low-power devices as much as possible, with a total power consumption of no more than 2.5W. At the same time, it is required that heat sources with high power consumption be distributed as symmetrically as possible.

[0036] Furthermore, the gyroscope control circuit needs to clearly define the location and height information of the high-power devices.

[0037] The cover plate is provided with heat-conducting bosses, whose horizontal position distribution is consistent with the position distribution of the high-power devices of the gyroscope control circuit 3. The height setting needs to ensure that the gap between the heat-conducting bosses and the high-power devices of the gyroscope control circuit 3 is no more than 1mm.

[0038] Furthermore, a thermally conductive filling material is provided between the cover plate 1 and the gyroscope control circuit 3. The material is the same size as the thermally conductive protrusion and its thickness is generally greater than 1 mm.

[0039] The pad is located between the gyroscope control circuit and the heat spreader. It is mainly used to support the gyroscope control circuit, on the one hand to prevent mechanical interference between the components of the gyroscope control circuit and the heat spreader; on the other hand, it is used to conduct the heat generated by the gyroscope control circuit.

[0040] Furthermore, the pad can be made of a metal material with a high thermal conductivity.

[0041] Furthermore, the gyroscope control circuit, pad, heat spreader, and base are fixed together by fastening screws to form a downward heat conduction path.

[0042] The cover plate, base, and heat spreader are all black on both the inner and outer surfaces, which can improve heat absorption efficiency and accelerate the thermal equilibrium of the entire modular digital laser gyroscope.

[0043] The modular digital laser gyroscope is not limited to single-axis laser gyroscopes, but also includes three-axis laser gyroscopes. The modular digital laser gyroscope is not limited to dithering laser gyroscopes, but is also applicable to other types of frequency-biased laser gyroscopes.

[0044] The following is in conjunction with the appendix Figure 1 , 2Further explanation of this utility model is provided in sections 3 and 4. A modular digital laser gyroscope considering thermal balance mainly comprises a cover plate 1, a gyroscope control circuit 3, a heat spreader 6, a ring laser sensor 7, and a base 8. The heat generated by the gyroscope control circuit 3 is transferred upwards to the cover plate 1 via heat conduction, and downwards through the gyroscope control circuit printed circuit board and fastened to the base 8 via screws 4. The cover plate 1 and base 8 exchange heat through thermal convection with the outside air. To further reduce the impact of uneven temperature field distribution generated by the gyroscope control circuit 3 on the performance of the ring laser sensor, a heat spreader 6 is designed between the gyroscope control circuit 3 and the ring laser, effectively isolating and encapsulating the gyroscope control circuit 3 and the ring laser sensor 7 in different spaces.

[0045] The base 8 has threaded mounting holes on its inner side for mounting the heat spreader 6;

[0046] The ring laser sensor 7 is located between the base 8 and the heat spreader 6, and is fixed to the heat spreader 6 by a dedicated shaking screw;

[0047] Furthermore, the ring laser sensor 7 is attached with anisotropic graphene 71 on its top and bottom. This material has high horizontal thermal conductivity and low Z-axis thermal conductivity, which can quickly dissipate the local heat generated by thermal convection in the heat spreader 6.

[0048] Furthermore, the heat spreader 6 is located between the ring laser sensor 7 and the gyroscope control circuit 3, and is connected to the base 8 by fastening screws 4. It mainly plays the role of heat spreader, so as to achieve rapid and uniform heat distribution.

[0049] Furthermore, the heat spreader 6 is made of aluminum plate with a high thermal conductivity and a thickness of 8mm.

[0050] Furthermore, the heat spreader 6 is provided with threaded through holes for fastening screws 4 to pass through, and a wiring groove 61 is designed on the front side for constraining the signal harness of the ring laser sensor 7. The heat spreader 6 has a planar structure, which facilitates wiring and electrical assembly by operators and can effectively improve assembly efficiency.

[0051] Furthermore, the thickness of the cover plate 1 and the base 8 is 1.5mm.

[0052] The gyroscope control circuit 3 is located above the heat spreader 6. The gyroscope control circuit 3 includes loops for frequency stabilization control, current stabilization control, jitter control, and readout signal demodulation. The gyroscope control circuit 3 needs to use low-power devices as much as possible, with a total power consumption of 1.5W. The heat sources with higher power consumption are symmetrically distributed.

[0053] Furthermore, the position distribution and height information of the high-power devices in the gyroscope control circuit 3 are known.

[0054] The cover plate 1 is provided with heat-conducting protrusions 11, whose horizontal position distribution is consistent with the position distribution of high-power devices in the gyroscope control circuit 3. The height setting needs to ensure that the gap between the heat-conducting protrusions 11 and the high-power devices in the gyroscope control circuit 3 is 0.5mm.

[0055] Furthermore, a thermally conductive filling material is provided between the cover plate 1 and the gyroscope control circuit 3. The material is the same size as the thermally conductive protrusion 11 and has a thickness of 0.6 mm.

[0056] Furthermore, a dedicated connector is provided between the cover plate 1 and the gyroscope control circuit 3 to enable signal cross-linking with the inertial navigation computer.

[0057] The pad 5 is located between the gyroscope control circuit 3 and the heat spreader 6. It is mainly used to support the gyroscope control circuit 3, on the one hand to prevent mechanical interference between the components of the gyroscope control circuit 3 and the heat spreader 6, and on the other hand to conduct the heat generated by the gyroscope control circuit 3.

[0058] Furthermore, the pad 5 can be made of copper.

[0059] Furthermore, the gyroscope control circuit 3, the pad 5, the heat spreader 6, and the base 8 are fixedly connected by fastening screws 4, forming a downward heat conduction path.

[0060] The inner and outer surfaces of the cover plate 1, base 8 and heat spreader 6 are all black, which can improve heat absorption efficiency and accelerate the thermal balance of the entire modular digital laser gyroscope.

[0061] Furthermore, the cover plate 1 and the base 8 are fixed together by screws, and silicone rubber can be applied between the cover plate 1 and the base 8 to ensure airtightness.

[0062] The beneficial effects of this utility model are as follows: 1. The modular digital laser gyroscope considering thermal balance proposed in this utility model adds a heat-spreading structure between the gyroscope control circuit and the ring laser gyroscope sensor. By mounting the ring laser sensor on the heat-spreading plate, the cover plate and base can be made lighter. The overall structure is simple, easy to install, has good manufacturability, and is conducive to weight reduction. 2. The addition of heat-conducting bosses and heat-conducting filling material between the gyroscope control circuit and the cover plate forms an upward heat conduction channel, and the addition of fastening screws and washers between the gyroscope control circuit and the base forms a downward heat conduction channel. This can significantly improve the effect of uneven thermal field distribution of the gyroscope control circuit and large temperature gradient on the gyroscope, and can significantly improve the performance of the gyroscope.

Claims

1. A modular digital laser gyro taking into account thermal balance, characterized in that, include: Cover plate (1), gyroscope control circuit (3), heat spreader (6), ring laser sensor (7) and base (8); The heat spreader (6) is positioned between the gyroscope control circuit (3) and the ring laser sensor (7); and the ring laser sensor (7) is fixedly connected to the lower surface of the heat spreader (6); and the gyroscope control circuit (3) is fixedly connected to the upper surface of the heat spreader (6). The heat spreader (6) is fixedly connected to the base (8) on all four sides; the cover plate (1) is located above the gyroscope control circuit (3) and is fixedly connected to the base (8); The heat generated by the gyroscope control circuit (3) is transferred upward to the cover plate (1) through heat conduction, and downward to the base (8) through the fastening screw (4). The cover plate (1) and the base (8) exchange heat through heat convection with the outside air.

2. A modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, Also includes: shim (5); The pad (5) is located between the gyroscope control circuit (3) and the heat spreader (6) and is used to support the gyroscope control circuit (3); the gyroscope control circuit (3), the pad (5), the heat spreader (6) and the base (8) are fixed together by fastening screws (4) to form a downward heat conduction path.

3. The modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, A heat-conducting boss (11) is provided on the cover plate (1). The horizontal position distribution of the heat-conducting boss (11) is consistent with the position distribution of the high-power device of the gyroscope control circuit (3). The height setting of the heat-conducting boss (11) needs to ensure that there is a gap between the heat-conducting boss (11) and the high-power device of the gyroscope control circuit (3) for placing the heat-conducting filling material (2).

4. The modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, The ring laser sensor (7) has anisotropic materials attached to its top and bottom; The horizontal thermal conductivity of the anisotropic material is greater than its Z-axis thermal conductivity.

5. The modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, The heat spreader (6) is provided with threaded through holes for fastening screws (4) to pass through, and a wiring groove (61) is designed on the front side for constraining the signal bundle of the ring laser sensor (7). The heat spreader (6) is a planar structure.

6. The modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, The inner and outer surfaces of the cover plate (1), base (8) and heat spreader (6) are all black.

7. The modular digital laser gyro taking into account thermal balance according to claim 1, characterized in that, The thickness of the heat spreader (6) is 4 mm to 8 mm, and the thickness of the cover plate (1) and the base (8) is 0.5 mm to 1.5 mm.

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