Method, device and equipment for detecting diameter of end face of optical fiber bundle

Abstract

The invention relates to the field of optical detection instruments, and discloses an optical fiber bundle end face diameter detection method, device and equipment, and the method comprises the steps: turning off a first light source, turning on a second light source, collecting a first end face image of a to-be-detected optical fiber bundle, and generating a circular fitting parameter of the to-be-detected optical fiber bundle; fixing the grating plate on the target clamping device, turning off the second light source, turning on the first light source, collecting a first imaging image of the grating plate, and generating an imaging ring diameter of the to-be-detected optical fiber bundle; and calculating the diameter of the cladding and / or the diameter of the coating layer according to the diameter of the imaging ring and the circle fitting parameters. By controlling the on-off of different light sources and automatically collecting images, a plurality of detection results, such as geometric parameters, imaging ring diameter, cladding diameter and coating diameter, of the end face of the optical fiber bundle can be flexibly obtained, the influence of environmental factors on the detection results is reduced, the detection results are stable and reliable, and the detection efficiency is high.

Description

Technical Field

[0001] The present invention relates to the field of optical detection instruments, and in particular to a method, device and equipment for detecting the diameter of an optical fiber bundle end face. Background Art

[0002] Optical fiber is widely used in communications, healthcare, and other fields due to its high-quality light-guiding properties. Laser transmission is particularly common, with fiber bundles being a popular method of transmitting laser light. As a precision transmission medium, fiber bundles are subject to defects such as dust, dirt, scratches, damage, and poor polishing on their end faces, which can severely impact light transmission efficiency and signal integrity. Therefore, strict inspection of the fiber bundle end faces is essential during the production process to maximize their effectiveness.

[0003] The current detectors used on the market for inspecting fiber bundle end faces require the fiber bundle to be inserted into an adapter during use. The inspector then determines whether the fiber bundle end face is qualified by directly observing the image of the fiber bundle end face displayed through an eyepiece or a monitor. The following shortcomings exist when using the above-mentioned detectors to inspect fiber bundle end faces:

[0004] 1) When the detector detects the end face of the optical fiber bundle, the operator needs to use his or her own experience and subjective judgment of the clarity of the detection image to roughly adjust the position of the optical fiber bundle end face relative to the detection lens. Not only are the parameters that can be detected limited, but the efficiency and accuracy are also low. In addition, the inability to provide a suitable lighting source leads to unstable quality of the obtained detection image.

[0005] 2) Fiber optic bundles generally contain tens of thousands of optical fibers, which can easily be missed by naked eye observation, resulting in human errors.

[0006] 3) The end face of the optical fiber bundle is in a honeycomb shape. Observing this dense honeycomb shape with the naked eye a certain number of times can easily cause eye fatigue and discomfort. Summary of the Invention

[0007] The present invention provides a method, device and equipment for detecting the diameter of an optical fiber bundle end face, which solve the above-mentioned technical problems.

[0008] A first aspect of an embodiment of the present invention provides a device for detecting the diameter of an optical fiber bundle end face, comprising a first light source, a target clamping device, an optical fiber bundle clamping assembly, a lens group, and an image acquisition unit, which are arranged in sequence. The target clamping device is used to clamp a grating plate, and the optical fiber bundle clamping assembly is used to clamp an optical fiber bundle to be detected.

[0009] A second light source is further provided obliquely above the optical fiber bundle to be detected, and light emitted by the second light source is obliquely incident on the optical fiber bundle to be detected at a preset angle, and enters the lens group after diffuse reflection by the cladding and coating layer of the optical fiber bundle to be detected;

[0010] The image acquisition unit is used to acquire a first end face image of the optical fiber bundle to be detected under the illumination of the second light source and to acquire a first imaging image of the grating plate under the illumination of the first light source.

[0011] A second aspect of an embodiment of the present invention provides a method for detecting the diameter of an optical fiber bundle end face, comprising the following steps:

[0012] Step 1: Turn off the first light source, turn on the second light source, and control the light emitted by the second light source to obliquely enter the optical fiber bundle to be inspected at a preset angle and optimal illumination, collect a first end face image of the optical fiber bundle to be inspected, and generate circular fitting parameters of the optical fiber bundle to be inspected after processing the first end face image, wherein the circular fitting parameters include fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding, and the outer edge of the coating layer, respectively;

[0013] Step 2: After fixing the grating plate to the target holding device, the second light source is turned off and the first light source is turned on, the current illumination of the first light source is adjusted to the optimal illumination, and a first imaging image of the grating plate is acquired. The first imaging image is processed to generate the imaging circle diameter of the optical fiber bundle to be detected;

[0014] Step 3: Calculate the cladding diameter and / or coating diameter of the optical fiber bundle end face according to the imaging circle diameter and the circular fitting parameters.

[0015] A third aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the above-mentioned method for detecting the diameter of an end face of an optical fiber bundle is implemented.

[0016] A fourth aspect of the embodiments of the present invention provides a device for detecting the diameter of an optical fiber bundle end face, based on the diameter detection device, further comprising a light source switch controller and an image processing unit.

[0017] The light source switch controller is used to control the switching of the first light source and the second light source;

[0018] The image processing unit includes:

[0019] a first acquisition unit, configured to capture a first end face image of the optical fiber bundle to be inspected when light emitted by the second light source is obliquely incident on the optical fiber bundle to be inspected at a preset angle and an optimal illumination intensity, and generate circular fitting parameters of the optical fiber bundle to be inspected after processing the first end face image, the circular fitting parameters including fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding, and the outer edge of the coating;

[0020] a second acquisition unit, configured to capture a first imaging image of the grating plate when light emitted by the first light source at the optimal illumination passes through the optical fiber bundle to be detected and is focused by the lens group, and to generate an imaging circle diameter of the optical fiber bundle to be detected after processing the first imaging image;

[0021] A calculation unit is used to calculate the cladding diameter and / or coating diameter of the end face of the optical fiber bundle according to the imaging circle diameter and the circular fitting parameter.

[0022] The beneficial effects of the present invention are as follows: the present invention provides a method, device and apparatus for detecting the diameter of an optical fiber bundle end face, which, compared with the prior art, has at least the following beneficial effects:

[0023] (1) The grating plate can be imaged fully automatically, and the brightness of the imaging results can be reconstructed based on the brightness, position and triangulation results of the connected domain, so as to obtain more accurate imaging circle diameter data, cladding diameter data and coating layer diameter data.

[0024] (2) By controlling the on and off of different light sources and automatically collecting images, not only can multiple detection results of the fiber bundle end face be obtained flexibly, but the impact of environmental factors on the detection results is also reduced. The detection results are stable and reliable, and the detection efficiency is high.

[0025] In order to make the above-mentioned objects, features and advantages of the invention more obvious and easy to understand, preferred embodiments of the present invention are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 1 is a schematic structural diagram of the optical fiber bundle end face diameter detection device provided in Example 1;

[0028] Figure 2 2 is a flow chart of a method for detecting the diameter of an optical fiber bundle end face provided in Example 2;

[0029] Figure 3 It is a structural diagram of the image processing unit in the diameter detection device provided in Example 3. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that, unless there is a conflict, the various features of the embodiments of the present invention may be combined with each other and are all within the scope of protection of the present invention. In addition, although the functional modules are divided in the device schematics and the logical order is shown in the flow charts, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flow charts. Furthermore, the terms "first," "second," "third," etc. used in the present invention do not limit the data or execution order, but only distinguish between identical or similar items with substantially the same functions and effects.

[0032] Figure 1 Schematic diagram of the structure of a diameter detection device for an optical fiber bundle end face provided in Example 1. Figure 1 As shown, the apparatus comprises a first light source 3, a target clamping device 10, a fiber bundle clamping assembly, a lens group 7, and an image acquisition unit 5, which are arranged in sequence. The target clamping device 10 is used to clamp the grating plate, and the fiber bundle clamping assembly is used to clamp the fiber bundle to be detected 15. Exemplarily, the fiber bundle clamping assembly includes a proximal clamping device 8 for clamping one end of the fiber bundle to be detected close to the lens group 7, and a distal clamping device 12 for clamping the other end of the fiber bundle to be detected 15.

[0033] like Figure 1 As shown, a second light source 2 is provided obliquely above the optical fiber bundle 15 to be inspected. Light emitted by the second light source 2 is incident obliquely on the optical fiber bundle 15 to be inspected at a preset angle, and after diffuse reflection from the cladding and coating of the optical fiber bundle 15 to be inspected, enters the lens assembly 7. When the second light source 2 is turned on, the image acquisition unit 5 is used to capture a first end-face image of the optical fiber bundle to be inspected under the illumination of the second light source 2; when the first light source 3 is turned on, the image acquisition unit 5 is used to capture a first imaged image of the grating plate under the illumination of the first light source 3. In subsequent steps, the first end-face image and the first imaged image are processed to obtain the cladding diameter and coating diameter of the corresponding optical fiber bundle end face.

[0034] In other preferred embodiments, different images can be flexibly collected by controlling the on / off of the first light source 3 and the second light source 2, and clamping the resolution plate through the target clamping device 10, so as to obtain different detection parameters of the end face of the optical fiber bundle to be detected, including imaging area non-circularity, cladding non-circularity, coating non-circularity, imaging area / cladding concentricity, imaging area / coating concentricity and lateral resolution results, etc., thereby reducing the influence of environmental factors on the detection results, and the detection results are stable and reliable, and the detection efficiency is high.

[0035] Exemplarily, the lens assembly 7 can be a collection of two or more lenses, such as a first lens element, a second lens element, a third lens element, and a fourth lens element, wherein the first lens element is a plano-convex lens, the second lens element is a doublet, the third lens element is an aspheric lens, and the fourth lens element is a biconvex lens. This lens assembly can focus light passing through the optical fiber bundle, thereby ensuring a clearer captured image and enabling accurate identification of defects on the end face of the optical fiber bundle.

[0036] The image acquisition unit 5 is a photoelectric conversion module. In a specific scenario, a CCD camera, a CMOS camera, etc. can be used. The upper limit of the brightness thereof varies according to the specific structure and can be recorded as T.

[0037] like Figure 1 As shown, in a preferred embodiment, the optical fiber bundle end face diameter detection device further includes a first controller 9 connected to the optical fiber bundle clamping assembly and / or a second controller 11 connected to the target clamping device 10,

[0038] The first controller 9 is used to move the optical fiber bundle clamping assembly so that the proximal end surface of the optical fiber bundle to be detected is close to or away from the lens group, and is used to move the optical fiber bundle clamping assembly so that the distal end surface of the optical fiber bundle to be detected is close to or away from the grating plate;

[0039] The second controller 11 is used to adjust the target clamping device 10 so that the grating plate reaches the target position.

[0040] like Figure 1 As shown, in a preferred embodiment, the diameter detection device for the end face of the optical fiber bundle also includes a display device 13 and a storage medium 14 connected to the image processing unit 4, wherein the display device 13 is used to display the imaging processing image of each step and the corresponding detection result, and the storage medium 14 is used to store the imaging processing image and the detection result.

[0041] Based on the above diameter detection device, embodiment 2 of the present invention further provides a method for detecting the diameter of an optical fiber bundle end face, such as Figure 2 As shown, the following steps are included:

[0042] Step 1: Turn off the first light source 3, turn on the second light source 2, and control the light emitted by the second light source 2 to be obliquely incident on the optical fiber bundle to be detected 15 at a preset angle and optimal illumination, collect the first end face image of the optical fiber bundle to be detected, and generate the circular fitting parameters of the optical fiber bundle to be detected after processing the first end face image. The circular fitting parameters include the fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding, and the outer edge of the coating layer, respectively.

[0043] In a specific embodiment, the second light source 2 can be a parallel surface light source, such as an LED light source, and the optical fiber bundle to be inspected is a polished optical fiber bundle, wherein the center is the imaging area, which is mirror-reflected, while the outer cladding and coating layers are diffusely reflected. The second light source 2 is adjusted to the optimal illumination and preset angle, and a first end-face image of the optical fiber bundle to be inspected is collected. The pixel value of the central imaging area of this first end-face image is low, while the pixel value of the outer cladding and coating regions is high, presenting two relatively obvious annular regions. Therefore, this can be used to extract the cladding image and coating image of the optical fiber bundle to be inspected, thereby fitting the required circular fitting parameters.

[0044] Then, step 2 is performed. After the grating plate is fixed on the target clamping device 10, the second light source 2 is turned off, and the first light source 3 is turned on. The current illumination of the first light source 3 is adjusted to the optimal illumination and the first imaging image of the grating plate is collected. After processing the first imaging image, the imaging circle diameter of the optical fiber bundle 15 to be detected is generated.

[0045] In a specific embodiment, the first light source 3 may also be a common illumination light source, such as a parallel plane light source. The light from the first light source 3 is irradiated onto the grating plate, and the image acquisition unit captures a first imaging image of the grating plate. Then, grating line segment extraction and circle fitting are performed to obtain the imaging circle diameter.

[0046] Finally, in step 3, the cladding diameter and / or coating diameter of the optical fiber bundle end face is calculated based on the imaging circle diameter and the circular fitting parameters.

[0047] Exemplarily, in a preferred embodiment, the cladding diameter is calculated as:

[0048]

[0049] Calculate the coating diameter as:

[0050]

[0051] Among them, D1, D2, and D3 are the fitting diameters corresponding to the outer edges of the imaging area, cladding, and coating, respectively. A is the imaging circle diameter. D2' and D3' are the cladding diameter and coating diameter of the fiber bundle end face, respectively. This allows for more accurate diameter calculation results and reduces detection errors.

[0052] For example, in a specific embodiment, step 1 generates circular fitting parameters of the optical fiber bundle to be detected after processing the first end face image, specifically:

[0053] S101, preprocessing the first end face image to generate a second end face image, wherein the preprocessing includes smoothing, grayscale processing, and / or sharpening processing;

[0054] S102, calculating the position offset parameter a of each pixel point (i, j) in the second end face image, using the following calculation formula:

[0055] Where i and j represent the horizontal and vertical coordinates of the pixel respectively, and W and H represent the width and height of the second end surface image respectively;

[0056] S103: querying a preset mapping table, obtaining corresponding convolution kernels according to the range of the position offset parameter a, performing convolution operations on pixels at different pixel positions in the second end-face image using different convolution kernels, and taking the absolute value of the convolution results pixel by pixel to generate a gradient map of the second end-face image;

[0057] S104 , performing edge extraction on the gradient image, and performing circular fitting on the extracted edge image using a preset circular fitting method to generate corresponding circular fitting parameters.

[0058] In the above embodiment, the gradient map can highlight areas of the image with rapid grayscale changes. These areas typically correspond to the edges of the fiber end face, such as the boundary between the core and the cladding. It can also enhance local features in the image, making the edges clearer. Therefore, by extracting the gradient map, these edges can be more accurately located, resulting in more accurate geometric parameter measurements.

[0059] In order to improve the extraction efficiency of the gradient map, for example, when or When , the convolution kernel is:

[0060] [[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,0,1,1,1]];

[0061] when When , the convolution kernel is:

[0062] [[0,1,1,1,1,1,1],[-1,0,1,1,1,1,1],[-1,-1,0,1,1,1,1],[-1,-1,-1,0,1,1,1],[-1,-1,-1,-1,0,1,1],[-1,-1,-1,-1,-1,0,1],[-1,-1,-1,-1,-1,0,1]];

[0063] when When , the convolution kernel is:

[0064] [[-1,-1,-1,-1,-1,-1,-1],[-1,-1,-1,-1,-1,-1,-1,-1],[-1,-1,-1,-1,-1,-1,-1,-1],[0,0,0,0,0,0,0],[1,1,1,1,1,1,1,1],[1,1,1,1,1,1,1,1]];

[0065] when When , the convolution kernel is:

[0066] [[1,1,1,1,1,1,0],[1,1,1,1,1,0,-1],[1,1,1,1,0,-1,-1],[1,1,1,0,-1,-1,-1],[1,1,0,-1,-1,-1,-1],[1,0,-1,-1,-1,-1,-1],[0,-1,-1,-1,-1,-1,-1]].

[0067] For example, in step 2 of another embodiment, the imaging circle diameter of the optical fiber bundle to be detected is generated after processing the first imaging image, specifically:

[0068] S201 , preprocessing and segmenting the first imaging image, and determining all connected domains in the imaging circle area, the centroid position of each connected domain, and the brightness value of each connected domain in the segmentation result.

[0069] Specifically, preprocessing involves smoothing and inverting the first image to generate a processed image with reduced noise and inverted color values, allowing for better analysis, detection, and feature extraction of subsequent images. Smoothing primarily reduces image noise and detail, making the image appear smoother and more uniform. Inverting, on the other hand, takes the inverted color value of each pixel in the image—that is, subtracting the current pixel value from the maximum value in the image. This process can highlight bright areas in the image and make dark areas more visible, allowing for better observation and extraction of image details.

[0070] For example, a watershed algorithm can be used to segment a preprocessed image, dividing the pixels in the image into different regions while ensuring that the pixels within the same region have similar characteristics. Specifically, the watershed algorithm is a morphologically based algorithm that calculates the gradient of an image to obtain the gradient value of each pixel in the image. This gradient information is then used to segment the image, effectively segmenting the image while also eliminating over-segmentation.

[0071] Then, for the segmentation results, all connected domains and the centroid of each connected domain are found within the imaging circle. A connected domain in this invention is defined as a region formed by adjacent pixels. Each connected domain represents a fiber in the fiber bundle. By identifying connected domains, isolated noise points or non-target areas can be effectively eliminated, focusing on the area most likely to be the fiber core.

[0072] For example, when a connected domain has only one pixel, the brightness value of the connected domain is the pixel value of the pixel. When a connected domain has multiple pixels, the brightness value of the connected domain is the maximum value of the pixel values of all pixels in the connected domain. In this way, the brightness value of all connected domains can be recorded as V k , k=1,2,…,K, K is the total number of connected domains.

[0073] Then, S202 is executed to perform Delaunay triangulation on all the connected domain centroids to form a plurality of Delaunay triangular meshes to connect the connected domain centroids;

[0074] S203 , calculating the distance between each pixel point in the first imaging image and at least one vertex in the corresponding Delaunay triangulation mesh, and calculating the reconstructed brightness of the pixel point based on the brightness value of the connected domain corresponding to the vertex.

[0075] In a preferred embodiment, in order to improve computational efficiency and detection accuracy, the following method for calculating reconstructed brightness is adopted: if the pixel point is any vertex of a triangular mesh, the reconstructed brightness of the pixel point is the brightness value of the connected domain corresponding to the vertex;

[0076] If the pixel point is on any edge of the Delaunay triangulation mesh, and the vertices of the triangulation mesh corresponding to the edge are k1 and k2 respectively, then the reconstructed brightness of the pixel point is:

[0077]

[0078] If the pixel point is inside any Delaunay triangle mesh, and the corresponding vertices of the triangle mesh are k1, k2, and k3 respectively, then the reconstructed brightness of the pixel point is:

[0079]

[0080] Among them, i and j are pixel coordinates, are the brightness of the connected domain corresponding to vertices k1, k2, and k3 respectively; d1, d2, and d3 are the distances between the pixel point and the vertices k1, k2, and k3 respectively.

[0081] Then, S204 is executed to generate a second imaging image of the grating plate according to the reconstructed brightness of all pixels;

[0082] S205 , processing all the grid lines in the second imaging image into line segments, and performing circle fitting based on all the line segments, wherein the diameter of the fitting circle is the imaging circle diameter of the optical fiber bundle to be detected.

[0083] In a further preferred embodiment, the step of adjusting the current illumination of the first light source and the second light source is further included, specifically:

[0084] configuring a plurality of illumination levels with sequentially increasing illumination for a light source, and setting an initial illumination of the light source to an intermediate level, the light source comprising a first light source and a second light source;

[0085] Acquire a first imaging image or a first end surface image, and calculate the actual brightness of the light source imaging corresponding to the current illumination level based on the first imaging image or the first end surface image;

[0086] Determine whether the actual brightness is within the preset brightness range. If so, the current illumination is the optimal illumination. If the actual brightness is higher than the preset brightness range, adjust the current illumination of the light source to the previous illumination level. If the actual brightness is lower than the preset brightness range, adjust the current illumination of the light source to the next illumination level, and repeat the above steps until the actual brightness is within the preset brightness range.

[0087] Exemplarily, the actual imaging brightness is one or more of the following: the sum of pixel values at all pixel positions in the first image or the first end-face image, the average pixel value at all pixel positions, the sum of pixel values at the target pixel position, and the average pixel value at the target pixel position. The preset brightness range is [0.8*T, 0.95*T], where T is the maximum brightness value generated by the image acquisition unit.

[0088] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0089] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the above-mentioned method for detecting the diameter of the end face of an optical fiber bundle is implemented.

[0090] Exemplarily, Example 3 further provides a diameter detection device for the end face of an optical fiber bundle, which, based on the diameter detection device described above, further includes a light source switch controller and an image processing unit, wherein the light source switch controller is used to control the opening and closing of the first light source and the second light source. Figure 3 A structural diagram of the image processing unit in one embodiment is given. Figure 3 As shown,

[0091] The image processing unit includes:

[0092] The first acquisition unit 100 is configured to capture a first end face image of the optical fiber bundle to be inspected when light emitted by the second light source is obliquely incident on the optical fiber bundle to be inspected at a preset angle and optimal illumination, and to generate circular fitting parameters of the optical fiber bundle to be inspected after processing the first end face image. The circular fitting parameters include fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding, and the outer edge of the coating, respectively.

[0093] The second acquisition unit 200 is configured to capture a first imaging image of the grating plate when light emitted by the first light source at the optimal illumination passes through the optical fiber bundle to be inspected and is focused by the lens group, and to generate an imaging circle diameter of the optical fiber bundle to be inspected after processing the first imaging image;

[0094] The calculation unit 300 is configured to calculate the cladding diameter and / or coating diameter of the end face of the optical fiber bundle according to the imaging circle diameter and the circular fitting parameter.

[0095] It should be noted that the above explanation of the embodiment of the method for detecting the diameter of the end face of an optical fiber bundle is also applicable to the device and apparatus for detecting the diameter of the end face of an optical fiber bundle in the above embodiment, and will not be repeated here.

[0096] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0097] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0098] Those skilled in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0099] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0101] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0102] The present invention is not limited to what is described in the specification and embodiments, and additional advantages and modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein without departing from the spirit and scope of the general concept defined by the claims and their equivalents.

Claims

1. A device for detecting the diameter of an optical fiber bundle end face, characterized in that: The invention comprises a first light source (3), a target clamping device (10), an optical fiber bundle clamping assembly, a lens group (7) and an image acquisition unit (5) which are arranged in sequence, wherein the target clamping device (10) is used to clamp a grating plate, and the optical fiber bundle clamping assembly is used to clamp an optical fiber bundle (15) to be detected; A second light source (2) is also provided obliquely above the optical fiber bundle (15) to be detected, and light emitted by the second light source (2) is obliquely incident on the optical fiber bundle (15) to be detected at a preset angle, and enters the lens group (7) after diffuse reflection by the cladding and coating of the optical fiber bundle (15) to be detected; The image acquisition unit (5) is used to acquire a first end face image of the optical fiber bundle to be detected when illuminated by the second light source (2) and to acquire a first imaging image of the grating plate when illuminated by the first light source (3).

2. The optical fiber bundle end face diameter detection device according to claim 1, characterized in that: It also includes a first controller (9) connected to the optical fiber bundle clamping assembly and / or a second controller (11) connected to the target clamping device (10), The first controller (9) is used to move the optical fiber bundle clamping assembly so that the proximal end surface of the optical fiber bundle to be detected approaches or moves away from the lens group, and is used to move the optical fiber bundle clamping assembly so that the distal end surface of the optical fiber bundle to be detected approaches or moves away from the grating plate; The second controller (11) is used to adjust the target clamping device (10) so that the grating plate reaches a target position.

3. A method for detecting the diameter of an optical fiber bundle end face, based on the diameter detection device according to claim 1 or 2, characterized in that: The following steps are involved: Step 1, turning off the first light source (3), turning on the second light source (2), and controlling the light emitted by the second light source (2) to obliquely enter the optical fiber bundle to be detected (15) at a preset angle and optimal illumination, collecting a first end face image of the optical fiber bundle to be detected, and generating circular fitting parameters of the optical fiber bundle to be detected after processing the first end face image, wherein the circular fitting parameters include fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding, and the outer edge of the coating layer, respectively; Step 2, after fixing the grating plate on the target clamping device (10), turning off the second light source (2), turning on the first light source (3), adjusting the current illumination of the first light source (3) to an optimal illumination and collecting a first imaging image of the grating plate, and generating an imaging circle diameter of the optical fiber bundle (15) to be detected after processing the first imaging image; Step 3: Calculate the cladding diameter and / or coating diameter of the optical fiber bundle end face according to the imaging circle diameter and the circular fitting parameters.

4. The method for detecting the diameter of an optical fiber bundle end face according to claim 3, wherein: The calculated cladding diameter is: Calculate the coating diameter as: Wherein, D1, D2, and D3 are the fitting diameters corresponding to the outer edges of the imaging area, cladding, and coating, respectively; A is the imaging circle diameter; and D2' and D3' are the cladding diameter and coating diameter of the fiber bundle end face, respectively.

5. The method for detecting the diameter of an optical fiber bundle end face according to claim 4, wherein: In step 1, the circular fitting parameters of the optical fiber bundle to be detected are generated after processing the first end face image, specifically: S101, preprocessing the first end face image to generate a second end face image; S102, calculating the position offset parameter a of each pixel point (i, j) in the second end face image, using the following calculation formula: Where i and j represent the horizontal and vertical coordinates of the pixel respectively, and W and H represent the width and height of the second end surface image respectively; S103: querying a preset mapping table, obtaining corresponding convolution kernels according to the range of the position offset parameter a, performing convolution operations on pixels at different pixel positions in the second end-face image using different convolution kernels, and taking the absolute value of the convolution results pixel by pixel to generate a gradient map of the second end-face image; S104 , performing edge extraction on the gradient image, and performing circular fitting on the extracted edge image using a preset circular fitting method to generate corresponding circular fitting parameters.

6. The method for detecting the diameter of an optical fiber bundle end face according to claim 4, wherein: In step 2, the imaging circle diameter of the optical fiber bundle to be detected is generated after processing the first imaging image, specifically: S201, preprocessing and segmenting the first imaging image, determining all connected domains in the imaging circle area in the segmentation result, the centroid position of each connected domain, and the brightness value of each connected domain; S202, performing Delaunay triangulation on all connected domain centroids to form multiple Delaunay triangular meshes connecting the connected domain centroids; S203, calculating the distance between each pixel in the first image and at least one vertex in the corresponding Delaunay triangulation mesh, and calculating the reconstructed brightness of the pixel based on the brightness value of the connected domain corresponding to the vertex; S204, generating a second imaging image of the grating plate according to the reconstructed brightness of all pixels; S205 , processing all the grid lines in the second imaging image into line segments, and performing circle fitting based on all the line segments, wherein the diameter of the fitting circle is the imaging circle diameter of the optical fiber bundle to be detected.

7. The method for detecting the diameter of an optical fiber bundle end face according to claim 6, wherein: Calculate the reconstructed brightness of the pixel point, specifically: If the pixel point is any vertex of the triangular mesh, the reconstructed brightness of the pixel point is the brightness value of the connected domain corresponding to the vertex; If the pixel point is on any edge of the Delaunay triangulation mesh, and the vertices of the triangulation mesh corresponding to the edge are k1 and k2 respectively, then the reconstructed brightness of the pixel point is: If the pixel point is inside any Delaunay triangle mesh, and the corresponding vertices of the triangle mesh are k1, k2, and k3 respectively, then the reconstructed brightness of the pixel point is: Among them, i and j are pixel coordinates, are the brightness of the connected domain corresponding to vertices k1, k2, and k3 respectively; d1, d2, and d3 are the distances between the pixel point and the vertices k1, k2, and k3 respectively.

8. The method for detecting the diameter of an optical fiber bundle end face according to any one of claims 3 to 7, characterized in that: Adjust the light source to the optimal illumination, specifically: configuring a plurality of illumination levels with sequentially increasing illumination for a light source, and setting an initial illumination of the light source to an intermediate level, the light source comprising a first light source and a second light source; Acquire a first imaging image or a first end surface image, and calculate the actual brightness of the light source imaging corresponding to the current illumination level based on the first imaging image or the first end surface image; Determine whether the actual brightness is within a preset brightness range, and if so, determine that the current illumination is the optimal illumination; if the actual brightness is higher than the preset brightness range, adjust the current illumination of the light source down to the previous illumination level; If the actual brightness is lower than the preset brightness range, the current illumination of the light source is adjusted to the next illumination level, and the above steps are repeated until the actual brightness is within the preset brightness range.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for detecting the diameter of the end face of an optical fiber bundle according to any one of claims 3 to 8 is implemented.

10. A diameter detection device for an optical fiber bundle end face, based on the diameter detection device according to claim 1 or 2, characterized in that: It also includes a light source switch controller and an image processing unit. The light source switch controller is used to control the opening and closing of the first light source (3) and the second light source (2); The image processing unit includes: A first acquisition unit is configured to collect a first end face image of the optical fiber bundle (15) to be detected when light emitted by the second light source (2) is obliquely incident on the optical fiber bundle (15) to be detected at a preset angle and an optimal illumination, and to generate circular fitting parameters of the optical fiber bundle to be detected after processing the first end face image, wherein the circular fitting parameters include fitting diameters corresponding to the outer edge of the imaging area, the outer edge of the cladding layer, and the outer edge of the coating layer, respectively; a second acquisition unit, configured to collect a first imaging image of the grating plate when light emitted by the first light source (3) at the optimal illumination passes through the optical fiber bundle to be detected (15) and is focused by the lens group (7), and to generate an imaging circle diameter of the optical fiber bundle to be detected after processing the first imaging image; A calculation unit is used to calculate the cladding diameter and / or coating diameter of the end face of the optical fiber bundle according to the imaging circle diameter and the circular fitting parameter.

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