Multi-axis linkage type optical fiber automatic butt joint device and optical fiber intelligent butt joint method

Abstract

The invention provides a multi-axis linkage type optical fiber automatic butt joint device and an intelligent butt joint method, and relates to the technical field of optical fiber communication equipment.The multi-axis linkage type optical fiber automatic butt joint device comprises two three-axis moving mechanisms, a platform installed on the three-axis moving mechanisms and a rotation driving mechanism rotatably installed on the platform; the optical fiber butt joint assembly and the double-camera cooperative imaging system are installed on the rotation driving mechanism, one industrial camera is a wide-angle industrial camera and used for collecting the macroscopic butt joint posture of the optical fiber end face, and the other industrial camera is a microscopic industrial camera and used for collecting the microscopic details of the optical fiber end face; the three-axis moving mechanism, the rotary driving motor and the double-camera-position cooperative imaging system are all electrically connected with the control system. According to the invention, the three-axis moving mechanism is adopted and is matched with the rotation driving mechanisms to realize high-precision displacement adjustment in the spatial three-dimensional direction, the axes of the end faces of the optical fibers on the two sides can be parallel through rotation, and the platforms on the two sides are both provided with a plurality of rotation driving mechanisms, so that a plurality of optical fibers can be butted at the same time, and the working efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of optical fiber communication equipment technology, specifically to a multi-axis linkage automatic optical fiber connector and an intelligent optical fiber connection method. Background Technology

[0002] Optical fiber, also known as optical waveguide fiber, is a type of fiber made of glass or plastic that transmits signals using techniques such as total internal reflection of light within the fiber. With the continuous development of technology, the demand for devices that integrate efficient data transmission, signal imaging, and visualization is becoming increasingly urgent. As a crucial carrier of optical signals, the performance of the connectors in optical fiber directly affects the overall system's performance.

[0003] Fiber optic connectors have been widely used in many fields. However, traditional fiber optic connectors currently have relatively limited functionality and suffer from low alignment accuracy, requiring fixed-angle alignment and lacking the ability to freely adjust the alignment angle in applications such as polarization-maintaining fibers and multi-core fibers. While current fiber optic connectors can transmit multiple optical signals, meeting certain data communication needs, they fall short in acquiring, analyzing, and visualizing the image information carried by the transmitted optical signals. Traditional multi-axis fiber optic connectors can only transmit optical signals or provide single-dimensional imaging, failing to achieve a closed-loop process of "end-face quality assessment - docking posture calibration - process anomaly warning" through dual-camera collaborative display. This makes it difficult for inspection personnel to intuitively understand the actual internal conditions of the equipment, leading to low inspection efficiency and potentially overlooking some potential faults.

[0004] Furthermore, traditional fiber optic connectors primarily focus on optical signal transmission, lacking the ability to achieve automated alignment imaging and the coordinated display of microscopic end-face details and macroscopic docking posture. Moreover, existing fiber optic fusion splicers' dual-camera imaging is only used for monitoring the splicing process, lacking dynamic rotation alignment and a quantitative quality scoring system, and cannot achieve parallel docking of multi-channel fibers. Therefore, to address the aforementioned issues of the inability of fiber optic movable connectors to achieve automatic alignment and internal imaging, improving the alignment accuracy of multi-axis fiber optic movable connectors, enabling free-angle alignment, increasing the success rate of docking, and optimizing imaging functions are urgent problems to be solved in the field of optical communication. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a multi-axis linkage automatic fiber optic connector.

[0006] Specifically, on the one hand, the present invention provides a multi-axis linkage automatic fiber optic docking device, including two three-axis moving mechanisms, and further including: Platform: Mounted on a three-axis moving mechanism; Rotary drive mechanism: Rotatably mounted on the platform and driven to rotate by an electric angle table; Fiber optic splicing assembly: mounted on a rotary drive mechanism, which has a fiber optic slot and a pressure plate. The fiber optic slot is used to place the fiber optic cable, and the pressure plate is detachably mounted on the fiber optic splicing assembly to press and position the fiber optic cable. Dual-camera collaborative imaging system: includes two industrial cameras, one of which is a wide-angle industrial camera mounted on the platform to capture the macroscopic docking posture of the fiber end face; the other industrial camera is a microscopic industrial camera mounted on the side of the two platforms to capture the microscopic details of the fiber end face. The three-axis motion mechanism, rotary drive motor, and dual-camera collaborative imaging system are all electrically connected to the control system.

[0007] Furthermore: the industrial camera is mounted in a camera flange or quick-release slot structure.

[0008] Furthermore, the two platforms are equipped with telescopic adjustment mechanisms on their sides, which are electrically connected to the control system. The microscopic industrial camera is fixedly mounted on the telescopic adjustment mechanism.

[0009] Furthermore, the platform is equipped with miniature air nozzles for cleaning contaminants from the fiber optic end face, and these miniature air nozzles are electrically connected to the control system.

[0010] This invention also provides a method for intelligent fiber optic splicing using a multi-axis linkage automatic fiber optic connector, comprising the following steps: Includes the following steps: S1: Initialization and pre-alignment: Fix the two optical fibers to be connected into the two optical fiber connection assembly (6) respectively. The micro industrial camera acquires the end face images of the two optical fibers and calculates the geometric center coordinates of the end faces of the two optical fibers. The end face tilt angle α is evaluated. At the same time, the wide-angle industrial camera acquires the global image and identifies the macroscopic axis angle deviation β of the two optical fibers. The two optical fiber end face axes are made parallel by driving the rotation drive mechanism (12), and the two optical fiber end face axes are made coincident by driving the three-axis movement mechanism. S2: Progressive contact docking: The control system drives the three-axis moving mechanism to move the two platforms (11) axially so that the two optical fibers approach each other. The industrial camera (7) identifies the interference fringes or spot deformation caused by the approach of the optical fiber end faces. When the deformed spot area reaches 60% of the area covering the end face, it is determined to be a preliminary contact. The control system controls the three-axis moving mechanism to move in the opposite direction along the optical fiber axis and stop and wait. Then they approach each other again until preliminary contact is reached, and the above cycle process is repeated several times. S3: Dynamic rotation alignment: After the initial contact in S2, the control system controls the movement of two rotary drive mechanisms (12) to drive one of the optical fibers to rotate at a constant speed. At the same time, the industrial camera (7) synchronously acquires the end face image of the mobile optical fiber for alignment. The control system receives images captured by the industrial camera (7), calculates the center coordinates of the end face of the mobile fiber in real time based on each frame of image, and compares them with the center coordinates of the fixed fiber. Through continuous multi-frame data, it fits the motion trajectory of the center of the mobile end during rotation. Based on the center offset and roundness error of the motion trajectory, it generates compensation instructions in real time: taking the axis of the fiber as the Y direction and the horizontal direction perpendicular to the axis of the fiber as the X direction, let the center coordinates of the center trajectory of the mobile fiber during rotation be (X0, Y0), and the center coordinates of the fixed fiber be (X0, Y0). f ,Y f If the center offset is: ; The control module uses a PID controller to calculate the compensation displacement. ; in, This is the proportionality coefficient. The integral coefficient is... These are differential coefficients, which are tuned by the control system based on the preset fiber type and motion state. It is the compensation displacement in the X direction; The rotation phase fine adjustment Δθ = arctan(ΔY / ΔX) is adjusted in real time by the rotation drive mechanism, and then the X and Y direction tracks are driven to perform micro-motion compensation, while the rotation phase is finely adjusted until the coordinate offset of the center point of the two fiber end faces is within ±0.3 μm. S4: Fusion Quality Assessment S41: After the docking is stable, the industrial camera (7) takes the final docking end face fusion image to determine the interface gap and contaminant residue; S42: If the interface gap exceeds the set threshold, the control system will alarm to remind staff to investigate. If contaminants remain, the control system drives the micro air nozzle to clean the fiber optic contaminants and repeats S41.

[0011] Furthermore: In S1, the control system calculates the length compensation amount caused by thermal expansion based on the fiber material and the difference between the current ambient temperature and the calibrated temperature, and deducts the length compensation amount from the pre-compensation command in the Y-axis direction of the three-axis moving mechanism.

[0012] Furthermore: the calculation method for the length compensation is: ΔL = L0 * γ * Δt; Where ΔL is the length compensation amount, L0 is the fiber length, γ is the coefficient of thermal expansion, and Δt is the difference between the current ambient temperature and the calibration temperature.

[0013] Further: In S2, when the distance between the two fiber end faces is greater than the set distance threshold, the control system drives the Y-axis movement speed of the three-axis moving mechanism to v1, and when the distance between the two fiber end faces is less than or equal to the set distance threshold, the control system drives the Y-axis movement speed of the three-axis moving mechanism to v2, where v1 > v2.

[0014] Furthermore: During the S2 progressive contact docking process, the control system controls the miniature heating module installed in the fiber optic docking assembly to locally heat the fiber end face, and the heating temperature does not exceed 50°C.

[0015] Furthermore, S4 also includes S43: scoring the fiber optic splicing quality, including the following sub-steps: S431: Parameter Extraction: The final docking end face image is acquired by a micro-industrial camera, and the following are extracted through image processing: the center distance d of the fiber cores at both ends, the axial gap g of the end face, the pixel area ratio of end face scratches and stains s, and the parallelism deviation θ of the axes at both ends is extracted by the monitoring position of the docking process. S432: Individual Scoring: The scores for each individual indicator are calculated using a piecewise linear scoring function: ; ; S433: Overall Rating: Based on the scores of each individual indicator in S432, the weighted overall quality score Q is calculated as follows: Q=0.4S d +0.3S g +0.2S θ +0.1S s ; Among them, S d S is the score for center distance. g S is used to score the end face gap. θ For parallelism scoring, S s Scoring based on the area of ​​contamination; S434: Judgment and Feedback: When Q≥90: the docking is considered successful, and a report containing images, parameters, and scores is automatically generated and archived. When 75≤Q<90: it is determined to be usable and marked for re-inspection; When Q < 75: the docking is deemed a failure, and the reason is indicated based on the lowest sub-item, triggering automatic realignment or waiting for manual intervention.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention employs an orthogonally arranged three-axis moving mechanism in conjunction with a rotary drive mechanism to achieve high-precision displacement adjustment in three-dimensional space. Simultaneously, rotation ensures the parallelism of the optical fiber end faces on both sides. Furthermore, multiple rotary drive mechanisms are installed on both platforms, enabling simultaneous docking of multiple optical fibers and significantly improving work efficiency. The dual-camera collaborative imaging of this invention utilizes a closed-loop control system of "microscopic end face detection + macroscopic attitude calibration," adapting to physical docking scenarios and supporting multi-channel parallel operation, thus differentiating itself from fusion splicers.

[0017] 2. This invention employs a dual-camera collaborative imaging system, one of which is a wide-angle industrial camera used to capture the macroscopic docking posture of the fiber optic end face, and the other is a microscopic industrial camera used to capture the microscopic details of the fiber optic end face. This collaborative system enables simultaneous monitoring of both the microscopic end face and the macroscopic posture, significantly reducing docking failures caused by "inability to see or complete view," and ensuring high-quality, high-precision fiber optic docking.

[0018] 3. This invention, through the deep collaboration of a "dedicated hardware platform" and "intelligent process algorithm", constructs a fully closed-loop automated fiber optic docking system that integrates visual perception, dynamic alignment, stress control and quantitative evaluation. This fundamentally solves the industry pain points of traditional methods, which rely on human experience, have difficulty in guaranteeing accuracy, are prone to end-face damage and have no quality that can be quantitatively traced.

[0019] 4. This invention combines thermal expansion compensation with micro-heating technology and a progressive contact docking method. It uses thermal expansion to bring two optical fibers into contact with each other, rather than directly using thermal expansion to drive the optical fibers to move. This achieves pressure-free micro-contact between optical fibers, avoids end-face damage caused by traditional mechanical contact, and improves contact accuracy and stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the multi-axis linkage automatic fiber optic docking device of the present invention; Figure 2 This is a schematic diagram of the upper camera position of the dual-camera imaging system of the present invention; Figure 3 This is a block diagram of the control system of the present invention; Figure 4 The present invention relates to the fiber optic docking assembly and the rotary drive mechanism; Figure 5 This is a flowchart of the fiber optic intelligent docking process method of the present invention; Figure 6 This is a partial state diagram of the optical fiber docking process of the present invention.

[0021] In the figure, 1-base; 2-first moving device; 3-second moving device; 4-third moving device; 5-supporting and elevating structure; 6-fiber optic docking assembly; 61-fiber optic channel; 62-pressure plate; 7-industrial camera; 8-X-direction track; 9-Y-direction track; 10-Z-direction track; 11-platform; 12-rotation drive mechanism. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] This invention discloses a multi-axis linkage automatic fiber optic connector, such as... Figure 1 As shown, it includes a base 1 and two three-axis moving mechanisms mounted on the base. Each three-axis moving mechanism includes a first moving device 2, a second moving device 3, and a third moving device 4. The first moving device 2 is equipped with an X-axis track 8, responsible for the translation of the optical fiber in the X-axis direction. The second moving device 3 is equipped with a Y-axis track 9, responsible for the translation of the optical fiber in the Y-axis direction. The Y-axis track 9 is placed on a supporting elevation structure 5. The third moving device 4 is equipped with a Z-axis track 10, responsible for the translation of the optical fiber in the Z-axis direction. A platform 11 is fixedly mounted on the third moving device 4, and several optical fiber splicing assemblies 6 are provided on both platforms 11.

[0024] like Figure 4 As shown, the fiber optic docking assembly 6 includes a rotary drive mechanism 12. This mechanism is powered by multiple electric angle stages equipped with encoders, each driving one of the docking units to rotate independently. The transmission structure uses a worm gear drive with a self-locking function to ensure no loosening after the rotation angle is fixed. The rotation angle adjustment range is 0-360°, and closed-loop control is achieved through encoders and a PID algorithm to meet the angle consistency requirements during multi-channel fiber optic docking.

[0025] The fiber optic connector 6 is provided with a pressure plate 62 and fiber optic slots 61 on both sides of the pressure plate 62. The fiber optic slots 61 are used to accommodate the fiber and play a positioning role. The pressure plate 62 can be opened by a knob. After the fiber is placed, the pressure plate is closed and the knob is rotated so that the rotating pin connected to the knob is engaged with the lower flange to complete the positioning, thereby fixing the fiber.

[0026] It also features a dual-camera collaborative imaging system, which includes two industrial cameras 7. One of the industrial cameras 7 is a wide-angle industrial camera, which is mounted on the platform 11 and used to acquire the macroscopic docking posture of the fiber end face. The other industrial camera 7 is a microscopic industrial camera, which is mounted on the adjustment frame on the side of the two platforms 11 and used to acquire the microscopic details of the fiber end face. The adjustment frame can be adjusted along the X and Z axes to adjust the microscopic industrial camera to a suitable shooting angle.

[0027] The industrial microscope camera is positioned directly above platform 11, perpendicular to the axis of the fiber optic docking unit, and fixed by an electrically operated telescopic bracket. This bracket, driven by a micro stepper motor, allows for vertical raising and lowering of the camera to accommodate the working distance requirements of lenses with different magnifications. It employs an oblique light source and vertical imaging design, with the fiber optic cable extending horizontally without obstructing the observation path at the end face. When the two end faces approach each other, the reflected light from the fiber end face interferes with the incident light, producing alternating bright and dark interference fringes. The light spot deformation is caused by changes in the distance between the end faces; the smaller the distance, the larger the light spot diffusion range. The image algorithm accurately determines the contact state by identifying changes in fringe density and light spot area. It uses a combination of a high-resolution industrial microscope camera and a fixed-magnification microscope lens: the camera is a high-pixel CMOS industrial camera, and the lens is a fixed-magnification microscope lens of at least 20x magnification, coupled with a coaxial LED point light source, which can penetrate the fiber end face coating and clearly capture the details of the fiber end face.

[0028] A wide-angle industrial camera is mounted on one side of the base via a motorized telescopic arm. This arm can be driven by a control module or manually fine-tuned to ensure optimal macroscopic monitoring visibility at different platform heights and docking angles. It employs a combination of a wide-angle industrial camera and a low-distortion lens: the camera is a high-resolution CMOS industrial camera, the lens is a low-distortion lens, and it is equipped with a ring LED light source to capture the macroscopic posture of the multi-aperture rotatable fiber optic docking device in real time during X / Y / Z axis movement and 360° rotation.

[0029] like Figure 2 The diagram shows the upper camera position of the dual-camera imaging system of this invention. The microscopic image of the fiber optic end face acquired by the industrial microscope is used to extract the geometric center coordinates of the end face through edge detection and Hough transform algorithms, and the tilt angle is calculated by fitting the straight line of the end face edge using the least squares method. The macroscopic attitude image acquired by the monitoring camera during the docking process is used to calculate the axial angle deviation and relative displacement of the two fibers through feature point matching and perspective transformation algorithms. The control module synchronously processes the two types of image data using a weighted fusion algorithm: the end face coordinates are used for X / Y / Z axis displacement compensation, and the macroscopic attitude is used for rotation angle compensation, forming a closed-loop control of multi-sensor data fusion.

[0030] Image data from both cameras is synchronously transmitted to the control module via a dual-channel GigE interface. The data link supports real-time transmission and local caching: real-time transmission is used for synchronous updates of the display terminal, while local caching is used to store images during the docking process. SD cards or SSDs are used for storage with a capacity of ≥128GB. Circular overwriting or manual archiving is supported. Cached images are automatically associated with metadata such as docking number, timestamp, and fiber optic specifications for easy traceability later.

[0031] The display terminal supports dual-carrier display: a local touchscreen and a remote PC. The local display uses an industrial touchscreen, while the remote display connects to a PC via Ethernet, compatible with Windows / Linux systems. Display modes include dual-screen split-screen and single-screen split-column display. The three-axis motion mechanism, rotary drive motor, and dual-camera collaborative imaging system are all electrically connected to the control system, such as Figure 3 As shown, the control system can use an STM32 processor, which connects to various modules, allowing the control system to control the entire process of fiber optic docking.

[0032] This invention also provides a method for intelligent fiber optic docking using a multi-axis linkage automatic fiber optic docking device, such as... Figure 5 As shown, it includes the following steps: S1: Initialization and pre-alignment: Fix the two optical fibers to be connected into the two optical fiber connection assembly 6 respectively. The micro industrial camera acquires the end face images of the two optical fibers and calculates the geometric center coordinates of the end faces of the two optical fibers, evaluates the end face tilt angle α, and at the same time, the wide-angle industrial camera acquires the global image and identifies the macroscopic axis angle deviation β of the two optical fibers.

[0033] The control system calculates the length compensation amount due to thermal expansion based on the fiber material and the difference between the current ambient temperature and the calibration temperature. The length compensation amount is then deducted from the pre-compensation command in the Y-axis direction of the three-axis moving mechanism. The calculation method for the length compensation amount is: ΔL=L0*γ*Δt; where ΔL is the length compensation amount, L0 is the fiber length, γ is the coefficient of thermal expansion, and Δt is the difference between the current ambient temperature and the calibration temperature.

[0034] The rotating drive mechanism 12 drives the mobile fiber optic docking unit to rotate in the opposite direction by an angle α, so that the axes of the two fiber end faces are parallel; the tilt angle α1 of the fixed end is only recorded and not actively adjusted, and is compensated by axial path during the contact stage.

[0035] By driving a three-axis moving mechanism to make the axes of the two optical fiber end faces coincide, the wide-angle camera position measures the included angle β of the axes of the two optical fibers and the center translation deviation δ. The axis angle deviation β is decomposed into a translation component δ and a rotation component β_rot. The X / Y moving device is driven to compensate for δ, and the moving end is driven to rotate around the Z axis to compensate for β_rot. The wide-angle vision closed loop is iterated until β≤0.1° and δ≤2 μm.

[0036] In some embodiments, a collaborative control strategy is also adopted when adjusting the angle. That is, first, the axis angle deviation β is coarsely adjusted to bring the optical fiber into the field of view, then the end face tilt angle α is finely adjusted, and then the axis angle deviation β is finely adjusted to correct the participation deviation. The process is repeated until α≤0.2°, β≤0.1°, and center deviation≤1 μm.

[0037] S2: Progressive contact docking: such asFigure 6 As shown, the control system drives the three-axis moving mechanism, causing the two platforms 11 to move axially to bring the two optical fibers closer together. When the distance D between the two end faces decreases to a preset threshold (100 μm in this embodiment), the speed is switched to a low speed, such as v2 = 10 μm / s for precise approach. At this time, the monitoring position of the docking process continuously focuses on the contact area. The industrial camera 7 identifies the interference fringes or light spot deformation caused by the proximity of the optical fiber end faces. When the deformed light spot area reaches 60% of the end face area, it is determined to be preliminary contact. The control system controls the three-axis moving mechanism to slightly retract along the optical fiber axis, such as moving in the opposite direction by 5 μm, and stops and waits for 100ms to allow the material stress to relax. Then, they move closer together again until preliminary contact is reached, and the above cycle process is repeated several times. In this embodiment, the cycle is repeated 3 times. Specifically, the number of contact-retraction cycles is 3 by default, which can be adaptively adjusted according to the hardness of the optical fiber material. Hard materials such as quartz optical fiber are cycled 2-3 times, and soft materials such as plastic optical fiber are cycled 3-4 times. The retraction distance is 5 μm, which is set based on the elastic deformation threshold of the optical fiber end face.

[0038] When the area of ​​the deformed light spot reaches 60% of the coverage area of ​​the end face, it is considered as initial contact, which can realize the initial positioning of the fiber end face and avoid damage to the inner core due to uneven local stress on the end face caused by excessive angle deviation. After the angle calibration is completed, continue to approach at a speed of v2=10 μm / s until the deformed light spot covers 100% of the end face, which is considered as gapless bonding. At this time, the docking and fixing are performed.

[0039] During the progressive contact phase, the system can activate the miniature heating module integrated into the fiber optic docking unit to locally heat the fiber end face, maintaining the temperature below 50°C. Utilizing the thermal expansion effect of the fiber material, initial contact is achieved at both ends under gentle conditions, avoiding mechanical impact. The heating power P and time t are adaptively adjusted based on the fiber material's thermal expansion coefficient γ and the ambient temperature T. Throughout the process, servo motor current monitoring and image deformation feedback ensure that the contact pressure remains within a safe range of 0.05N-0.2N, effectively preventing end face crushing.

[0040] S3: Dynamic Rotation Alignment: After the initial contact in S2, the control system controls the two rotary drive mechanisms 12 to move, causing one of the optical fibers to rotate at a constant speed. At the same time, the end-face observation camera synchronously acquires the end-face image of the moving optical fiber for alignment. The control system receives images captured by a microscopic industrial camera, calculates the center coordinates of the mobile fiber's end face in real time based on each frame, and compares them with the center coordinates of the fixed fiber. Through multiple consecutive frames of data, it fits the motion trajectory of the mobile fiber's center during rotation. Based on the center offset and roundness error of the motion trajectory, it generates compensation commands in real time: Taking the fiber's axis as the Y-direction and the horizontal direction perpendicular to the fiber's axis as the X-direction, let the center coordinates of the mobile fiber's center trajectory during rotation be (X0, Y0), and the center coordinates of the fixed fiber be (X...). f ,Y f If the center offset is: ; The control module uses a PID controller to calculate the compensation displacement. ; in, This is the proportionality coefficient. The integral coefficient is... These are differential coefficients, which are tuned by the control system based on the preset fiber type and motion state. It is the compensation displacement in the X direction; The rotation phase fine adjustment Δθ = arctan(ΔY / ΔX) is adjusted in real time by the rotation drive mechanism, and then the X and Y direction tracks are driven to perform micro-motion compensation. At the same time, the rotation phase is finely adjusted until the coordinate offset of the center point of the two fiber end faces is within ±0.3 μm. The alignment is achieved during rotation and the centering is achieved dynamically.

[0041] The strategy of micro-contact followed by dynamic alignment is employed because optical interference fringes are generated at the fiber end face under slight contact. Image algorithms can accurately calculate the relative position and angular deviations. If the angle is adjusted before contact, contact deformation feedback cannot be utilized, easily leading to accumulated deviations. The end face contact target is full-area fit to ensure fiber core alignment. The end face observation position uses a 45° tilted reflector or a side-mounted microscope lens to avoid obstruction by fiber optic cables. The interference fringes or light spot deformation generated during contact can be identified by image algorithms and used as a basis for contact judgment.

[0042] S4: Fusion Quality Assessment S41: After the docking is stable, a micro-industrial camera is used to capture the final fused image of the docked end face to determine the interface gap and contaminant residue. Attitude consistency analysis: The monitoring station during the docking process analyzes the parallelism of the axes of the two optical fibers and provides the parallelism deviation angle.

[0043] S42: If the interface gap exceeds the set threshold, the control system will alarm to remind staff to investigate. If contaminants remain, the control system drives the micro air nozzle to clean the fiber optic contaminants and repeats S41.

[0044] S43: At the same time, the system provides scores for each indicator: Includes the following sub-steps: S431: Parameter Extraction: The final docking end face image is acquired by a micro industrial camera, and the following are extracted through image processing: the center distance d between the two fiber cores, the axial gap g between the end faces, the pixel area ratio s of the end face scratches and stains, and the parallelism deviation θ of the two axes extracted by the monitoring position of the docking process.

[0045] S432: Individual Scoring: The scores for each individual indicator are calculated using a piecewise linear scoring function: ; .

[0046] S433: Overall Rating: Based on the scores of each individual indicator in S432, the weighted overall quality score Q is calculated as follows: Q=0.4S d +0.3S g +0.2S θ +0.1S s ; Among them, S d S is the score for center distance. g S is used to score the end face gap. θ For parallelism scoring, S s Scoring is given based on the area of ​​contamination.

[0047] S434: Judgment and Feedback: When Q≥90: the docking is considered successful, and a report containing images, parameters, and scores is automatically generated and archived. When 75≤Q<90: it is determined to be usable and marked for re-inspection; When Q < 75: the docking is deemed a failure, and the reason is indicated based on the lowest sub-item, triggering automatic realignment or waiting for manual intervention.

[0048] S5: Post-processing: For applications requiring high quality, a miniature air nozzle can be integrated on platform 11. After successful docking, the nozzle sprays high-pressure pure nitrogen to purge any fine dust particles that may be present in the docking area. Simultaneously, the device can be connected to a miniaturized integrated optical power meter. Test light is injected during docking to quickly measure the initial insertion loss value, which is then recorded as a performance reference.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A multi-axis linkage automatic fiber optic docking device, comprising two three-axis moving mechanisms, characterized in that, Also includes: Platform (11): Mounted on a three-axis moving mechanism; Rotary drive mechanism (12): Rotatably mounted on platform (11) and driven to rotate by electric angle table; Fiber optic docking assembly (6): mounted on a rotary drive mechanism (12), which has a fiber optic slot (61) and a pressure plate (62). The fiber optic slot (61) is used to place the fiber optic cable, and the pressure plate (62) is detachably mounted on the fiber optic docking assembly (6) to press and position the fiber optic cable. Dual-camera collaborative imaging system: includes two industrial cameras (7), one of which is a wide-angle industrial camera, which is mounted on the platform (11) to acquire the macroscopic docking posture of the fiber end face; the other industrial camera (7) is a microscopic industrial camera, which is mounted on the side of the two platforms (11) to acquire the microscopic details of the fiber end face. Among them, the three-axis moving mechanism, the rotary drive mechanism (12) and the dual-camera collaborative imaging system are all electrically connected to the control system.

2. The multi-axis linkage automatic fiber optic connector as described in claim 1, characterized in that: The industrial camera (7) is installed in the camera flange or quick-release slot structure.

3. The multi-axis linkage automatic fiber optic connector as described in claim 1, characterized in that: The two platforms (11) are equipped with telescopic adjustment mechanisms on their sides. The telescopic adjustment mechanisms are electrically connected to the control system, and the microscopic industrial camera is fixedly installed on the telescopic adjustment mechanisms.

4. The multi-axis linkage automatic fiber optic connector as described in claim 1, characterized in that: The platform (11) is equipped with a miniature air nozzle for cleaning contaminants on the end face of the optical fiber. The miniature air nozzle is electrically connected to the control system.

5. A method for intelligent fiber optic docking using the multi-axis linkage automatic fiber optic docking device according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Initialization and pre-alignment: Fix the two optical fibers to be connected into the two optical fiber connection assembly (6) respectively. The micro industrial camera acquires the end face images of the two optical fibers and calculates the geometric center coordinates of the end faces of the two optical fibers. The end face tilt angle α is evaluated. At the same time, the wide-angle industrial camera acquires the global image and identifies the macroscopic axis angle deviation β of the two optical fibers. The two optical fiber end face axes are made parallel by driving the rotation drive mechanism (12), and the two optical fiber end face axes are made coincident by driving the three-axis movement mechanism. S2: Progressive contact docking: The control system drives the three-axis moving mechanism to move the two platforms (11) axially so that the two optical fibers approach each other. The industrial camera (7) identifies the interference fringes or spot deformation caused by the approach of the optical fiber end faces. When the deformed spot area reaches 60% of the area covering the end face, it is determined to be a preliminary contact. The control system controls the three-axis moving mechanism to move in the opposite direction along the optical fiber axis and stop and wait. Then they approach each other again until preliminary contact is reached, and the above cycle process is repeated several times. S3: Dynamic rotation alignment: After the initial contact in S2, the control system controls the movement of two rotary drive mechanisms (12) to drive one of the optical fibers to rotate at a constant speed. At the same time, the industrial camera (7) synchronously acquires the end face image of the mobile optical fiber for alignment. The control system receives images captured by the industrial camera (7), calculates the center coordinates of the end face of the mobile fiber in real time based on each frame of image, and compares them with the center coordinates of the fixed fiber. Through continuous multi-frame data, it fits the motion trajectory of the center of the mobile end during rotation. Based on the center offset and roundness error of the motion trajectory, it generates compensation instructions in real time: taking the axis of the fiber as the Y direction and the horizontal direction perpendicular to the axis of the fiber as the X direction, let the center coordinates of the center trajectory of the mobile fiber during rotation be (X0, Y0), and the center coordinates of the fixed fiber be (X0, Y0). f ,Y f If the center offset is: ； The control module uses a PID controller to calculate the compensation displacement. ； in, This is the proportionality coefficient. The integral coefficient is... These are differential coefficients, which are tuned by the control system based on the preset fiber type and motion state. It is the compensation displacement in the X direction; The rotation phase fine adjustment Δθ = arctan(ΔY / ΔX) is adjusted in real time by the rotation drive mechanism, and then the X and Y direction tracks are driven to perform micro-motion compensation, while the rotation phase is finely adjusted until the coordinate offset of the center point of the two fiber end faces is within ±0.3 μm. S4: Fusion Quality Assessment S41: After the docking is stable, the industrial camera (7) takes the final docking end face fusion image to determine the interface gap and contaminant residue; S42: If the interface gap exceeds the set threshold, the control system will alarm to remind staff to investigate. If contaminants remain, the control system drives the micro air nozzle to clean the fiber optic contaminants and repeats S41.

6. The fiber optic intelligent docking method as described in claim 5, characterized in that: In S1, the control system calculates the length compensation amount caused by thermal expansion based on the fiber material and the difference between the current ambient temperature and the calibration temperature, and deducts the length compensation amount from the pre-compensation command in the Y-axis direction of the three-axis moving mechanism.

7. The fiber optic intelligent docking method as described in claim 6, characterized in that: The length compensation is calculated as follows: ΔL = L0 * γ * Δt; Where ΔL is the length compensation amount, L0 is the fiber length, γ is the coefficient of thermal expansion, and Δt is the difference between the current ambient temperature and the calibration temperature.

8. The fiber optic intelligent docking method as described in claim 5, characterized in that: In S2, when the distance between the two fiber end faces is greater than the set distance threshold, the control system drives the Y-axis movement speed of the three-axis moving mechanism to v1. When the distance between the two fiber end faces is less than or equal to the set distance threshold, the control system drives the Y-axis movement speed of the three-axis moving mechanism to v2, where v1 > v2.

9. The fiber optic intelligent docking method as described in claim 5, characterized in that: During the S2 progressive contact docking process, the control system controls the miniature heating module installed in the fiber docking assembly (6) to locally heat the fiber end face, and the heating temperature does not exceed 50°C.

10. The fiber optic intelligent docking method as described in claim 5, characterized in that: S4 also includes S43: scoring the splicing quality of optical fibers, including the following sub-steps: S431: Parameter Extraction: The final docking end face image is acquired by a micro-industrial camera, and the following are extracted through image processing: the center distance d of the fiber cores at both ends, the axial gap g of the end face, the pixel area ratio of end face scratches and stains s, and the parallelism deviation θ of the axes at both ends is extracted by the monitoring position of the docking process. S432: Individual Scoring: The scores for each individual indicator are calculated using a piecewise linear scoring function: ； ； S433: Overall Rating: Based on the scores of each individual indicator in S432, the weighted overall quality score Q is calculated as follows: Q=0.4S d +0.3S g +0.2S θ +0.1S s ; Among them, S d S is the score for center distance. g S is used to score the end face gap. θ For parallelism scoring, S s Scoring based on the area of ​​contamination; S434: Judgment and Feedback: When Q≥90: the docking is considered successful, and a report containing images, parameters, and scores is automatically generated and archived. When 75≤Q<90: it is determined to be usable and marked for re-inspection; When Q < 75: the docking is deemed a failure, and the reason is indicated based on the lowest sub-item, triggering automatic realignment or waiting for manual intervention.

Images