Laser gyroscope cavity adjustment device and method

Abstract

The present invention discloses a laser gyroscope cavity adjustment device and method, the device comprises: a body positioning mechanism and a lens adjustment mechanism, the gyroscope body is detachably mounted on the body positioning mechanism; the lens adjustment mechanism comprises a lens frame, a mounting frame, a plane elastic adjustment component and an axial elastic adjustment component, the spherical mirror is detachably mounted in a first through hole provided on the lens frame; the lens frame is arranged in a second through hole provided on the mounting frame, and is elastically connected to the mounting frame through a plane elastic adjustment component, the plane elastic adjustment component can drive the lens frame to translate in a plane perpendicular to the axial direction of the gyroscope body under the drive of an external force; the linear drive mechanism drives the lens frame to move toward the mounting surface of the gyroscope body through the axial elastic adjustment component until the spherical mirror fits the mounting surface of the gyroscope body. The present invention has very low requirements on the processing accuracy of the adjustment device, does not require high-precision parallelism and verticality, and the strength of the optical glue is adjustable, which can improve the assembly efficiency and accuracy of the laser gyroscope cavity adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of laser gyroscope preparation, and in particular to a laser gyroscope cavity adjustment device and method. Background Art

[0002] Laser gyroscopes are sensors used to detect angular motion. Through integration operations, they obtain navigation parameters such as the speed, position, attitude, and heading of the moving carrier. Laser gyroscopes are called the "heart" of the inertial navigation system and play a vital role in navigation. The working principle of the laser gyroscope is based on the Sagnac effect. It is a quantum optical instrument with a bidirectional traveling wave laser as its core, and relies on a ring-shaped traveling wave laser oscillator to sense the inertial angular velocity.

[0003] The basic principle of the laser gyroscope is: in a geometrically shaped circular closed optical path, when a pair of forward and reverse light beams emitted from a certain point in the loop return to the point after being refracted along the optical path for a circle, the rotation of the closed circular optical path relative to the inertial space will cause the optical path or phase of the light beam to be different. The optical path difference or phase difference of the two light beams is proportional to the angular velocity of the rotation of the entire closed optical path. Therefore, cavity tuning is a difficult point in the manufacturing process of the laser gyroscope. The main task of cavity tuning is to fine-tune the two spherical reflectors in a small range so that the light emitted by the tunable laser forms a loop in the cavity and produces better resonant light. However, the laser gyroscope cavity tuning process has long relied on the experience and skills of the operator, which is labor-intensive, inefficient, and the cavity tuning quality is unstable, which seriously affects the production efficiency and quality control of the laser gyroscope.

[0004] The horizontal non-contact cavity adjustment method and the tilted contact method that have emerged in recent years have very high requirements for the machining accuracy of the cavity adjustment device. For example, the coated plane mirror position adjustment unit disclosed in CN103954274A still has the problem of the spherical mirror and the gyro body optical glue surface being completely parallel in space during assembly. It is difficult to ensure that the two sides are completely fitted and can be fine-tuned during assembly. Once an angle appears, the cavity adjustment will fail and the situation of starting over will occur. Therefore, it is difficult to achieve high-quality and efficient cavity adjustment. A solution is urgently needed to address the problems of low cavity adjustment quality and efficiency, difficult to control accuracy, and expensive devices for laser gyroscopes. Summary of the invention

[0005] In response to the problems in the background technology, the present invention proposes a laser gyroscope cavity adjustment device and method which has very low requirements on the processing accuracy of the adjustment device, does not require high-precision parallelism and verticality, and has adjustable optical glue strength, so as to improve the efficiency and accuracy of the laser gyroscope cavity adjustment assembly and enhance the yield and performance quality of the laser gyroscope.

[0006] The present invention adopts the following technical solutions:

[0007] A laser gyro cavity adjustment device comprises: an optical platform, a body positioning mechanism and a lens adjustment mechanism.

[0008] The body positioning mechanism is arranged on the optical platform, the gyro body of the laser gyro is detachably mounted on the body positioning mechanism, and the mounting surface of the gyro body on which the spherical mirror is to be mounted faces the lens adjustment mechanism;

[0009] The lens adjustment mechanism includes a lens frame, a mounting frame, a planar elastic adjustment component and an axial elastic adjustment component.

[0010] The lens frame is provided with a first through hole extending along the axial direction of the gyroscope body, and the spherical mirror is detachably installed in the first through hole;

[0011] The mounting frame is mounted on the optical platform, and a second through hole extending along the axial direction of the gyroscope body is opened on the mounting frame. The lens frame is mounted in the second through hole and is elastically connected to the mounting frame through the planar elastic adjustment component. The planar elastic adjustment component can drive the lens frame to translate in a plane perpendicular to the axial direction of the gyroscope body under the drive of an external force;

[0012] The lens frame and a linear drive mechanism are elastically connected through the axial elastic adjustment component, and the linear drive mechanism is used to drive the lens frame to move toward the mounting surface of the gyroscope body through the axial elastic adjustment component until the spherical mirror fits the mounting surface of the gyroscope body.

[0013] Preferably, the planar elastic adjustment component includes two one-dimensional elastic adjustment components.

[0014] The one-dimensional elastic adjustment component comprises a fine-tuning screw and an elastic component, wherein the fine-tuning screw and the elastic component of one one-dimensional elastic adjustment component are relatively arranged along a first direction perpendicular to the axial direction of the gyroscope body, and the fine-tuning screw and the elastic component of another one-dimensional elastic adjustment component are relatively arranged along a second direction perpendicular to the axial direction of the gyroscope body.

[0015] The fine-tuning screw is threadedly connected to the mounting frame, and one end thereof passes through the mounting frame and abuts against the side wall of the lens frame. The elastic component is threadedly connected to the mounting frame, and one end thereof passes through the mounting frame and abuts against the side wall of the lens frame.

[0016] Preferably, the elastic component includes a positioning pin abutting against the side wall of the lens frame, a plug screw threadedly connected to the mounting frame, and a compression spring compressed between the positioning pin and the plug screw.

[0017] Preferably, each one-dimensional elastic adjustment component has two groups of elastic components, and the two groups of elastic components of each one-dimensional elastic adjustment component are symmetrically arranged on both sides of the center line of the fine-tuning screw.

[0018] Preferably, a first groove is formed on the side wall of the lens frame at a position corresponding to the fine-tuning screw, one end of the fine-tuning screw extends into the first groove and abuts against the bottom wall of the first groove, and the first groove has a first space for the fine-tuning screw to escape when the lens frame moves along the axial direction of the gyro body;

[0019] A second groove is provided on the side wall of the lens frame at a position corresponding to the elastic component. One end of the positioning pin extends into the second groove and abuts against the bottom wall of the second groove. The second groove has a second space for the elastic component to escape when the lens frame moves along the axial direction of the gyroscope body.

[0020] Preferably, the spherical mirror is detachably mounted in the first through hole of the lens frame by means of a plurality of set screws, the plurality of set screws are distributed circumferentially along the first through hole, the set screws are threadedly connected to the lens frame, one end of the set screws passes through the lens frame and abuts against the spherical mirror, and the other end of the set screws passes through the mounting frame, and an avoidance through hole is provided on the mounting frame at a position corresponding to the set screw for the set screw to move along the plane of the lens frame.

[0021] Preferably, one end of the gyro body on which the spherical mirror is to be mounted can extend into the second through hole.

[0022] Preferably, the axial elastic adjustment component includes a spring and a flexible bracket, the flexible bracket is fixed on the optical platform, one end of the spring is fixedly connected to the flexible bracket, and the other end is used to abut against the lens frame, and the linear drive mechanism is arranged on the optical platform and is transmission-connected to the flexible bracket.

[0023] Preferably, the body positioning mechanism comprises a column, a first gasket, a sleeve, a second gasket and a fastening nut.

[0024] The column is fixed on the optical platform, and a step surface is provided on the circumference of the column. The first gasket, the sleeve and the second gasket are all sleeved on the column, and the gyroscope body is sleeved on the sleeve. The first gasket abuts between the step surface and the gyroscope body, the fastening nut is threadedly connected to the upper end of the column, and the second gasket abuts between the fastening nut and the gyroscope body.

[0025] As a general inventive concept, the present invention also provides a method for laser gyro cavity tuning using the above device, comprising the following steps:

[0026] S1: detachably mount the gyro body on the body positioning mechanism, and make the mounting surface of the gyro body on which the spherical mirror is to be mounted face toward the lens adjustment mechanism;

[0027] S2: The spherical mirror is detachably mounted in the first through hole of the lens frame;

[0028] S3: The linear drive mechanism drives the lens frame to move toward the mounting surface of the gyroscope body through the axial elastic adjustment component until the spherical mirror fits the mounting surface of the gyroscope body;

[0029] S4: driving the plane elastic adjustment component to move, so as to drive the lens frame to translate in a plane perpendicular to the axial direction of the gyro body, until the spherical mirror is adjusted to a set position of the mounting surface;

[0030] S5: The linear drive mechanism applies force to the lens frame through the axial elastic adjustment component, so that the spherical mirror is glued to the mounting surface of the gyro body under the action of the axial force.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] The laser gyro cavity adjustment of the present invention is mainly to position and assemble two spherical lenses on the corresponding optical glue surfaces of the gyro body. How to ensure that the spherical mirror and the optical glue surface of the gyro body can be completely fitted during assembly without being unable to be fine-tuned is the key to the laser gyro cavity adjustment. The present invention proposes a laser gyro cavity adjustment device and method, which first drives the axial elastic adjustment component to drive the lens frame to move toward the mounting surface of the gyro body through a linear drive mechanism, until the spherical mirror and the mounting surface of the gyro body are fitted, and then drives the plane elastic adjustment component to move, so as to drive the lens frame to translate in a plane perpendicular to the axial direction of the gyro body, until the spherical mirror is adjusted to the set position of the mounting surface, thereby adopting the flexible adjustment principle to achieve automatic leveling when the spherical mirror and the optical glue surface of the gyro body are assembled. The present invention has very low requirements on the processing accuracy of the adjustment device, and does not require high-precision parallelism and verticality. At the same time, the strength of the optical glue is adjustable, so that the optical glue is not fixed at the beginning of assembly and cannot be fine-tuned, thereby improving the assembly efficiency and accuracy of the laser gyro cavity adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the present invention more easily understood, the present invention will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. These drawings only depict typical embodiments of the present invention and should not be considered as limiting the scope of protection of the present invention.

[0034] Figure 1 Schematic diagram of the three-dimensional structure of the laser gyro cavity adjustment device according to an embodiment of the present invention (application state).

[0035] Figure 2 It is a schematic diagram of the three-dimensional structure of the laser gyro cavity adjustment device according to an embodiment of the present invention (initial state, only one set of lens adjustment mechanism is shown).

[0036] Figure 3 It is a schematic diagram of a first partial cross-sectional structure of a laser gyro cavity tuning device according to an embodiment of the present invention.

[0037] Figure 4 for Figure 3 An enlarged schematic diagram of the local cross-sectional structure.

[0038] Figure 5 It is a schematic diagram of a second partial cross-sectional structure of the laser gyro cavity tuning device according to an embodiment of the present invention.

[0039] Figure 6 for Figure 5 An enlarged schematic diagram of the local cross-sectional structure.

[0040] Figure 7 It is a schematic diagram of a partial cross-sectional structure of the main body positioning mechanism in an embodiment of the present invention.

[0041] Figure 8 This is a schematic structural diagram of the laser gyro cavity adjustment device according to an embodiment of the present invention after cavity adjustment is completed and the lens adjustment mechanism is removed.

[0042] Reference numerals:

[0043] 1. Optical platform; 2. Main body positioning mechanism; 21. Post; 22. First gasket; 23. Sleeve; 24. Second gasket; 25. Fastening nut; 3. Linear drive mechanism; 4. Lens holder; 41. First through hole; 42. First slot; 43. Second slot; 45. First space; 46. Second space; 44. Set screw; 5. Mounting frame; 51. Second through hole; 52. Avoidance through hole; 6. Plane elastic adjustment component; 61. Fine-tuning screw; 62. Positioning pin; 63. Plug screw; 64. Compression spring; 7. Axial elastic adjustment component; 71. Spring; 72. Flexible bracket; 8. Spherical mirror; 9. Gyro body; 10. Base. DETAILED DESCRIPTION

[0044] The following describes the implementation modes of the present invention with reference to the accompanying drawings so that those skilled in the art can better understand the present invention and implement it. However, the enumerated embodiments are not intended to limit the present invention. In the absence of conflict, the following embodiments and the technical features therein may be combined with each other, wherein the same components are represented by the same figure marks. Embodiment 1:

[0045] like Figure 1-Figure 7 As shown, the laser gyro cavity adjustment device of this embodiment includes: an optical platform 1, a body positioning mechanism 2 and a lens adjustment mechanism.

[0046] The body positioning mechanism 2 is arranged on the optical platform 1, and the gyro body 9 of the laser gyro is detachably mounted on the body positioning mechanism 2, and the mounting surface of the gyro body 9 to be mounted with the spherical mirror 8 faces the lens adjustment mechanism;

[0047] The lens adjustment mechanism includes a lens frame 4, a mounting frame 5, a planar elastic adjustment component 6 and an axial elastic adjustment component 7.

[0048] The lens frame 4 is provided with a first through hole 41 extending along the axial direction of the gyro body 9, and the spherical mirror 8 is detachably installed in the first through hole 41;

[0049] The mounting frame 5 is arranged on the optical platform 1. The mounting frame 5 is provided with a second through hole 51 extending along the axial direction of the gyroscope body 9. The lens holder 4 is arranged in the second through hole 51 and is elastically connected to the mounting frame 5 through a plane elastic adjustment component 6. The plane elastic adjustment component 6 can drive the lens holder 4 to translate in a plane perpendicular to the axial direction of the gyroscope body 9 under the driving of an external force.

[0050] The lens frame 4 and a linear drive mechanism 3 are elastically connected via an axial elastic adjustment component 7. The linear drive mechanism 3 is used to drive the lens frame 4 to move toward the mounting surface of the gyroscope body 9 via the axial elastic adjustment component 7 until the spherical mirror 8 fits the mounting surface of the gyroscope body 9.

[0051] Therefore, the linear drive mechanism 3 first drives the axial elastic adjustment component 7 to drive the lens frame 4 to move toward the mounting surface of the gyro body 9, and after the spherical mirror 8 fits the mounting surface of the gyro body 9, the plane elastic adjustment component 6 is driven to move, so as to drive the lens frame 4 to translate in a plane perpendicular to the axial direction of the gyro body 9, until the spherical mirror 8 is adjusted to the set position of the mounting surface, so that the lens adjustment mechanism of the present invention adopts the flexible adjustment principle, and realizes the automatic flexible leveling of the optical glue surface of the spherical mirror 8 and the gyro body 9 during assembly. The present invention has very low requirements on the processing accuracy of the adjustment device, and does not require high-precision parallelism and verticality. At the same time, the strength of the optical glue is adjustable, so that the optical glue is not fixed at the beginning of assembly and cannot be fine-tuned.

[0052] In this embodiment, the plane elastic adjustment component 6 includes two one-dimensional elastic adjustment components.

[0053] The one-dimensional elastic adjustment component includes a fine-tuning screw 61 and an elastic component, wherein the fine-tuning screw 61 and the elastic component of one one-dimensional elastic adjustment component are arranged relative to each other along a first direction perpendicular to the axial direction of the gyroscope body 9, and the fine-tuning screw 61 and the elastic component of another one-dimensional elastic adjustment component are arranged relative to each other along a second direction perpendicular to the axial direction of the gyroscope body 9.

[0054] The fine-tuning screw 61 is threadedly connected to the mounting frame 5, and one end thereof passes through the mounting frame 5 and abuts against the side wall of the lens frame 4. One end of the elastic component is detachably connected to the mounting frame 5, and the other end thereof passes through the mounting frame 5 and abuts against the side wall of the lens frame 4.

[0055] In order to ensure the displacement adjustment on the optical glue surface, the present invention proposes the above-mentioned highly integrated planar elastic adjustment component 6, which provides fine-tuning in the horizontal and vertical directions, and effectively ensures the clamping force during optical glue. Only by adjusting the horizontal and vertical fine-tuning screws 61, the spherical mirror 8 can achieve precise adjustment of the optical glue surface.

[0056] In this embodiment, the elastic component includes a positioning pin 62 abutting against the side wall of the lens frame 4 , a plug screw 63 threadedly connected to the mounting frame 5 , and a compression spring 64 compressed between the positioning pin 62 and the plug screw 63 .

[0057] In this embodiment, each one-dimensional elastic adjustment component has two groups of elastic components, and the two groups of elastic components of each one-dimensional elastic adjustment component are symmetrically arranged on both sides of the center line of the fine-tuning screw 61.

[0058] The plane elastic adjustment component 6 mainly realizes the adjustment of the lens frame 4 in the horizontal direction perpendicular to the axial direction of the gyroscope body 9 and the vertical direction, thereby realizing fine-tuning of any position in the vertical plane; the functional principle of the plane elastic adjustment component 6 is to respectively set a fine-tuning screw 61 and two positioning pins 62 in the horizontal and vertical directions perpendicular to the axial direction of the gyroscope body 9, and the positioning pins 62 are adjusted by the compression spring 64 and the plug screw 63 to generate a certain pressing force, so that the two positioning pins 62 are always pressed against the lens frame 4; the fine-tuning screw 61 is designed at the central axis position of the mounting frame 5, and a fine-thread screw hole is provided on the mounting frame 5, and the two positioning pins 62 are designed opposite to the fine-tuning screw 61, and are symmetrically arranged with the fine-tuning screw 61 as the center, and the larger the spacing, the more conducive to the stable force. A fine-tuning screw 61 and two positioning pins 62, a compression spring 64, and a plug screw 63 are combined into a one-dimensional elastic adjustment component, and the same structure is also used in the other direction.

[0059] In this embodiment, a first groove 42 is formed at a position of the side wall of the lens holder 4 corresponding to the fine-tuning screw 61. One end of the fine-tuning screw 61 extends into the first groove 42 and abuts against the bottom wall of the first groove 42. The first groove 42 has a first space 45 for the fine-tuning screw 61 to escape when the lens holder 4 moves along the axial direction of the gyro body 9.

[0060] A second groove 43 is formed on the side wall of the lens frame 4 at a position corresponding to the elastic component. One end of the positioning pin 62 extends into the second groove 43 and abuts against the bottom wall of the second groove 43. The second groove 43 has a second space 46 for the elastic component to escape when the lens frame 4 moves axially along the gyro body 9.

[0061] Rectangular grooves are provided around the lens frame 4, and the bottom of the groove provides a top pressure reference surface for the plane elastic adjustment component 6. There is a certain adjustment gap and limiting effect between the side of the groove and the fine-tuning screw 61 of the plane adjustment component. The adjustment gap ensures that the axial elastic adjustment component 7 has a certain axial displacement when acting on the lens frame 4, so that the plane elastic adjustment component 6 will not be stuck in the lens frame 4 and cannot be adjusted, thereby eliminating the influence of the installation error of the plane elastic adjustment component 6; the limiting function is to prevent the lens frame 4 from detaching from the plane elastic adjustment component 6 when the adjustment is excessive; an annular groove is provided on the lens frame 4 towards the center of the surface of the spring 71 for circumferential and center positioning of the spring 71.

[0062] In this embodiment, the spherical mirror 8 is detachably mounted in the first through hole 41 of the lens frame 4 by means of a plurality of set screws 44. The plurality of set screws 44 are circumferentially distributed along the first through hole 41. The set screws 44 are threadedly connected to the lens frame 4. One end of the set screws 44 passes through the lens frame 4 and abuts against the spherical mirror 8, and the other end of the set screws 44 passes through the mounting frame 5. An avoidance through hole 52 is provided on the mounting frame 5 at a position corresponding to the set screws 44 for the set screws 44 to move along the plane of the lens frame 4.

[0063] After passing through the mounting frame 5, the set screw 44 is threadedly connected to the lens frame 4 and screwed in until it abuts against the side wall of the spherical mirror 8 to fix the spherical mirror 8; an avoidance through hole 52 is provided on the mounting frame 5 so that the set screw 44 can have a certain micro-displacement with the lens frame 4.

[0064] In this embodiment, the end of the gyro body 9 to be mounted with the spherical mirror 8 can extend into the second through hole 51 .

[0065] In addition, the mounting frame 5 is supported on the optical platform 1 through a base 10. One end of the base 10 is fixed to the optical platform 1, and the other end is fixed to the mounting frame 5, which has a certain rigidity and strength, and bears the force support when the spring 71 acts.

[0066] In this embodiment, the axial elastic adjustment component 7 includes a spring 71 and a flexible bracket 72. The flexible bracket 72 is fixed on the optical platform 1. One end of the spring 71 is fixedly connected to the flexible bracket 72, and the other end is used to abut against the lens frame 4. The linear drive mechanism 3 is arranged on the optical platform 1 and is transmission-connected to the flexible bracket 72.

[0067] The linear drive mechanism 3 is an optical standard component with the function of micro-adjustment of displacement. The fixed surface of its component is fixedly connected to the optical platform 1, and the movable surface is connected to the flexible bracket 72. The position of the flexible bracket 72 can be adjusted to adjust the pressure when the spherical mirror 8 and the gyroscope body 9 are fitted together, and the adjustable tightness is ensured by adjusting the differential head.

[0068] The spring 71 is a compression spring, and its inner diameter is close to the outer diameter of the spherical mirror, so as to ensure that the potential energy of the spring always acts on the position closest to the spherical mirror, so that the acting force is more concentrated and uniform; one end of the spring 71 can be welded or glued to the flexible bracket 72, and a pressure sensor can be added to the side of the spring 71 to read the force value for higher precision, and the other end is close to the lens frame 4; because the spring 71 has a certain degree of free deflection in three-dimensional space and has a flexible positioning function, if the smooth plastic surface of the gyroscope body 9 is used as a fixed reference surface, when the spring 71 brings the smooth plastic surface of the spherical mirror 8 into contact with the smooth plastic surface of the gyroscope body 9, even if there is a non-parallel angle, when the spring 71 produces axial displacement, due to the limitation of the smooth plastic surface of the gyroscope body 9, the spring 71 will produce a certain deflection in the circumferential direction, so as to make the spherical mirror 8 fit to the smooth plastic surface of the gyroscope body 9, and make up for the angle problem caused by the non-parallelism of the two surfaces.

[0069] In this embodiment, the main body positioning mechanism 2 is mainly responsible for the rapid disassembly and fixation of the gyro body 9, and includes a column 21, a first gasket 22, a sleeve 23, a second gasket 24 and a fastening nut 25.

[0070] The column 21 is fixed on the optical platform 1, and a step surface is provided on the circumference thereof. The first gasket 22, the sleeve 23 and the second gasket 24 are all sleeved on the column 21, and the gyroscope body 9 is sleeved on the sleeve 23. The first gasket 22 abuts between the step surface and the gyroscope body 9, the fastening nut 25 is threadedly connected to the upper end of the column 21, and the second gasket 24 abuts between the fastening nut 25 and the gyroscope body 9.

[0071] The column 21 is made of metal, one end of which is designed with an internal threaded hole to connect with the optical platform 1, and the other end of which is designed with a threaded shaft to install the resonant cavity.

[0072] The first gasket 22 and the second gasket 24 are made of polymer material, which mainly protects the two large end faces of the gyro body 9 made of glass material without directly contacting the metal to damage the surface. The first gasket 22 and the second gasket 24 pass through the column 21, and the elastic material has an anti-loosening effect.

[0073] The sleeve 23 is made of high-resolution material, mainly protecting the inner wall of the center hole of the glass gyroscope body 9, and not directly contacting the metal to damage the surface. The sleeve 23 wraps the column 21, and its length is slightly smaller than the thickness of the gyroscope body 9, ensuring that the first gasket 22 and the second gasket 24 can always be pressed against the large end surface of the gyroscope body 9.

[0074] The fastening nut 25 is made of metal material, with an outer diameter of more than 20 mm, which is convenient and quick to tighten by hand. At the same time, a flat mouth is designed so that it can be tightened by a tool.

[0075] Compared with the existing laser gyro cavity tuning device, this structure has the following advantages:

[0076] 1) In order to solve the problem that the optical glue surface of the spherical mirror and the gyroscope body is difficult to be completely parallel in space, a flexible adjustment principle is proposed to automatically level the optical glue surface of the spherical mirror resonant cavity during assembly. The processing accuracy requirements of the adjustment device are very low, and high-precision parallelism and verticality are not required. At the same time, the strength of the optical glue is adjustable, so that the optical glue is not fixed at the beginning of assembly and cannot be fine-tuned. It is easy to use, has low processing cost, and has precise fitting;

[0077] 2) In order to ensure the micro-adjustment on the plane of the optical resin surface, a highly integrated plane adjustment structure is proposed. The spherical lens can be accurately adjusted on the optical resin surface by simply adjusting the fine-tuning screws on the horizontal and vertical sides. The three-point distribution of the top pressure has good adjustment stability.

[0078] 3) In order to ensure the tuning of laser gyro of different models and specifications, the device can increase the elastic force and position calibration. Through several groups of different spring compression or elastic force tests, the best compression or elastic force value can be found as the best parameter of the laser gyro tuning of this model and specification, and the tuning index can be standardized, thereby improving the quality stability of the laser gyro tuning of the same model. Embodiment 2:

[0079] This embodiment uses the device of Example 1 to perform a laser gyro cavity tuning method, including the following steps:

[0080] S1: detachably mount the gyro body 9 on the body positioning mechanism 2, and make the mounting surface of the gyro body 9 on which the spherical mirror 8 is to be mounted face the lens adjustment mechanism;

[0081] S2: The spherical mirror 8 is detachably mounted in the first through hole 41 of the lens frame 4;

[0082] S3: The linear drive mechanism 3 drives the lens holder 4 to move toward the mounting surface of the gyro body 9 through the axial elastic adjustment component 7 until the spherical mirror 8 fits the mounting surface of the gyro body 9;

[0083] S4: driving the plane elastic adjustment component 6 to move, so as to drive the lens frame 4 to translate in a plane perpendicular to the axial direction of the gyro body 9, until the spherical mirror 8 is adjusted to the set position of the mounting surface;

[0084] S5: The linear drive mechanism 3 applies force to the lens frame 4 through the axial elastic adjustment component 7, so that the spherical mirror 8 is glued to the mounting surface of the gyro body 9 under the action of the axial force.

[0085] This method is mainly based on the principle of flexible leveling and alignment to achieve rapid and high-precision assembly of the spherical mirror 8 and the gyroscope body 9, without the need for high-precision parallelism and verticality, and the strength of the optical glue is adjustable. The specific steps include: gyroscope body installation - first spherical mirror pre-positioning - second spherical mirror pre-positioning - optical cavity adjustment - force fixation - dismantling of the workpiece.

[0086] Installation of gyro body: install gyro body 9 onto column 21 by using first gasket 22, sleeve 23 and second gasket 24, pre-tighten gyro body 9 by fastening nut 25, and leave adjustment space for the position of gyro body 9; lens adjustment mechanism is always fixed on optical platform 1, and lens holder 4 can be adjusted to the extreme position by axial elastic adjustment component 7 at this time, observe that the optical glue surface of gyro body 9 is roughly parallel to the plane of lens holder 4, and then gyro body 9 can be tightened and fixed;

[0087] The first spherical mirror 8 is pre-positioned: the differential head of the axial elastic adjustment component 7 is adjusted to make the spring 71 away from the lens frame 4 and the mounting frame 5, the spherical mirror 8 is placed into the lens frame 4 using a clean tool, the set screws 44 around it are tightened, and the differential head of the axial elastic adjustment component 7 is adjusted to make the spring 71 press into the positioning groove of the lens frame 4, thereby driving the spherical mirror 8 to approach the gyro body 9, and then automatically aligning and leveling due to the force, and fitting on the smooth plastic surface of the gyro body 9, at this time, the feed amount or force value of the spring 71 is recorded as the pre-positioning of the spherical mirror 8;

[0088] Pre-positioning of the second spherical mirror 8: The method is the same as the pre-positioning of the first spherical mirror 8;

[0089] Optical cavity tuning: by using a tuning laser as an index laser and signal collection, the plane elastic adjustment component 6 is used to generate micro-motion in the horizontal and vertical directions perpendicular to the axis of the gyroscope body 9 until the best point of the spherical mirror 8 is found;

[0090] Fix with force: After the best point is found for the position of the spherical mirror 8, adjust the two sets of micrometer heads of the axial elastic adjustment components 7 to the best pressure or displacement of the optical glue, and keep it for 3 to 6 minutes;

[0091] Remove the workpiece: adjust the differential heads of the two sets of axial elastic adjustment components 7 respectively to make the spring 71 separate from the lens frame 4, such as Figure 8 As shown, the four fixing screws 44 on the two lens holders 4 are then screwed out, and the fastening nuts 25 are loosened, so that the workpiece can be removed from the device.

[0092] The embodiments described above are only preferred specific implementations of the present invention. This specification uses the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments" to refer to one or more of the same or different embodiments according to the present disclosure. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser gyro cavity tuning device, characterized in that: include: An optical platform (1), a body positioning mechanism (2) and a lens adjustment mechanism, The body positioning mechanism (2) is arranged on the optical platform (1), and the gyro body (9) of the laser gyro is detachably mounted on the body positioning mechanism (2), and the mounting surface of the gyro body (9) on which the spherical mirror (8) is to be mounted faces the lens adjustment mechanism; The lens adjustment mechanism comprises a lens frame (4), a mounting frame (5), a planar elastic adjustment component (6) and an axial elastic adjustment component (7). The lens frame (4) is provided with a first through hole (41) extending along the axial direction of the gyroscope body (9), and the spherical mirror (8) is detachably mounted in the first through hole (41); The mounting frame (5) is arranged on the optical platform (1); a second through hole (51) extending along the axial direction of the gyroscope body (9) is formed on the mounting frame (5); a lens frame (4) is arranged in the second through hole (51) and is elastically connected to the mounting frame (5) via the planar elastic adjustment component (6); the planar elastic adjustment component (6) can drive the lens frame (4) to translate in a plane perpendicular to the axial direction of the gyroscope body (9) under the drive of an external force; The lens frame (4) and a linear drive mechanism (3) are elastically connected via the axial elastic adjustment component (7), and the linear drive mechanism (3) is used to drive the lens frame (4) to move toward the mounting surface of the gyroscope body (9) via the axial elastic adjustment component (7) until the spherical mirror (8) is in contact with the mounting surface of the gyroscope body (9); One end of the gyro body (9) on which the spherical mirror (8) is to be mounted can extend into the second through hole (51).

2. The laser gyro cavity tuning device according to claim 1, characterized in that: The planar elastic adjustment component (6) includes two one-dimensional elastic adjustment components. The one-dimensional elastic adjustment component comprises a fine-tuning screw (61) and an elastic component, wherein the fine-tuning screw (61) and the elastic component of one one-dimensional elastic adjustment component are arranged relative to each other along a first direction perpendicular to the axial direction of the gyroscope body (9), and the fine-tuning screw (61) and the elastic component of another one-dimensional elastic adjustment component are arranged relative to each other along a second direction perpendicular to the axial direction of the gyroscope body (9). The fine-adjusting screw (61) is threadedly connected to the mounting frame (5), and one end of the fine-adjusting screw (61) passes through the mounting frame (5) and abuts against the side wall of the lens frame (4); one end of the elastic component is detachable from the mounting frame (5), and the other end of the elastic component passes through the mounting frame (5) and abuts against the side wall of the lens frame (4).

3. The laser gyro cavity tuning device according to claim 2, characterized in that: The elastic component comprises a positioning pin (62) abutting against a side wall of the lens frame (4), a plug screw (63) threadedly connected to the mounting frame (5), and a compression spring (64) compressed between the positioning pin (62) and the plug screw (63).

4. The laser gyro cavity tuning device according to claim 3, characterized in that: Each one-dimensional elastic adjustment component has two groups of elastic components, and the two groups of elastic components of each one-dimensional elastic adjustment component are symmetrically arranged on both sides of the center line of the fine-tuning screw (61).

5. The laser gyro cavity tuning device according to any one of claims 2 to 4, characterized in that: A first groove (42) is formed on a side wall of the lens frame (4) at a position corresponding to the fine-tuning screw (61); one end of the fine-tuning screw (61) extends into the first groove (42) and abuts against a groove bottom wall of the first groove (42); and the first groove (42) has a first space (45) for the fine-tuning screw (61) to escape when the lens frame (4) moves along the axial direction of the gyro body (9); A second groove (43) is provided on the side wall of the lens frame (4) at a position corresponding to the elastic component. One end of the positioning pin (62) extends into the second groove (43) and abuts against the bottom wall of the second groove (43). The second groove (43) has a second space (46) for the elastic component to escape when the lens frame (4) moves axially along the gyro body (9).

6. The laser gyro cavity tuning device according to any one of claims 1 to 4, characterized in that: The spherical mirror (8) is detachably mounted in a first through hole (41) of a lens frame (4) by means of a plurality of set screws, the plurality of set screws being distributed circumferentially along the first through hole (41), the set screws being threadedly connected to the lens frame (4), one end of the set screws passing through the lens frame (4) and abutting against the spherical mirror (8), and the other end of the set screws passing through a mounting frame (5), wherein a position on the mounting frame (5) corresponding to the set screws is provided with an avoidance through hole (52) for allowing the set screws to move along the plane of the lens frame (4).

7. The laser gyro cavity tuning device according to any one of claims 1 to 4, characterized in that: The axial elastic adjustment component (7) comprises a spring (71) and a flexible bracket (72); the flexible bracket (72) is fixed on the optical platform (1); one end of the spring (71) is fixedly connected to the flexible bracket (72); the other end of the spring (71) is used to abut against the lens frame (4); and the linear drive mechanism (3) is arranged on the optical platform (1) and is transmission-connected to the flexible bracket (72).

8. The laser gyro cavity tuning device according to any one of claims 1 to 4, characterized in that: The body positioning mechanism (2) comprises a column (21), a first gasket (22), a sleeve (23), a second gasket (24) and a fastening nut (25). A column (21) is fixed on the optical platform (1) and has a stepped surface on its circumference. A first gasket (22), a sleeve (23) and a second gasket (24) are all sleeved on the column (21). A gyroscope body (9) is sleeved on the sleeve (23). The first gasket (22) abuts between the stepped surface and the gyroscope body (9). A fastening nut (25) is threadedly connected to the upper end of the column (21). The second gasket (24) abuts between the fastening nut (25) and the gyroscope body (9).

9. A method for laser gyro cavity tuning using the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: detachably mounting the gyroscope body (9) on the body positioning mechanism (2), and making the mounting surface of the gyroscope body (9) on which the spherical mirror (8) is to be mounted face the lens adjustment mechanism; S2: detachably mounting the spherical mirror (8) in the first through hole (41) of the lens frame (4); S3: the linear drive mechanism (3) drives the lens frame (4) to move toward the mounting surface of the gyroscope body (9) through the axial elastic adjustment component (7) until the spherical mirror (8) is in contact with the mounting surface of the gyroscope body (9); S4: driving the plane elastic adjustment component (6) to move, so as to drive the lens frame (4) to translate in a plane perpendicular to the axial direction of the gyro body (9), until the spherical mirror (8) is adjusted to a set position of the mounting surface; S5: The linear drive mechanism (3) applies force to the lens frame (4) through the axial elastic adjustment component (7), so that the spherical mirror (8) is glued to the mounting surface of the gyro body (9) under the action of the axial force.

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