Detection device and detection method for clustered optical fiber module

Abstract

The invention discloses a detection device and a detection method for a clustered optical fiber module, which are used for improving an imaging effect and reducing requirements on a detection environment. The device comprises a bottom plate, a camera, a lens, a sleeve and an optical fiber module, a first fixing ring and a second fixing ring aligned with the first fixing ring are arranged on the bottom plate, the lens is arranged between the first fixing ring and the second fixing ring, the sleeve penetrates through the first fixing ring to be connected with one end of the lens, the other end of the lens penetrates through the second fixing ring to be connected with the lens, and the first fixing ring is used for fixing the sleeve. The second fixing ring is used for fixing the lens; the end, away from the lens, of the sleeve is provided with an installation flange, the center of the installation flange is provided with a through hole, one end of the optical fiber module is located in the through hole and connected with the installation flange, and therefore when the light source irradiates the other end of the optical fiber module, the camera shoots the end face of the optical fiber module located in the sleeve through the lens.

Description

Technical Field

[0001] The present application relates to the field of optical fiber detection technology, and in particular to a detection device and a detection method for a clustered optical fiber module. Background Art

[0002] Product quality inspection after fiber bundle processing is a key step to ensure product quality, mainly to detect fiber breakage. Traditional inspection methods rely on optical imaging technology, specifically, one side of the optical fiber is illuminated by a light source, the other side is photographed and recorded using a microscope lens, and then the number of broken fibers is counted through manual or machine vision algorithms.

[0003] The traditional method requires the use of strong light at one end of the optical fiber to form sufficient light intensity contrast at the other end to facilitate the microscope lens to capture the image. In order to form a clear image contrast, not only does the optical fiber end face need to be tightly wrapped by a high-intensity point light source, but the entire detection environment must also be in a darkroom to avoid interference from external light. This places high demands on the detection environment, and building such an environment also increases the detection cost;

[0004] In addition, the installation and adjustment process of the microscope lens is complicated and is easily affected by external factors such as vibration and temperature changes, resulting in unstable imaging quality. And because the imaging quality of the microscope lens is closely related to the working distance, changes in the working distance will directly lead to changes in the measurement size standard (i.e. the "near big and far small" phenomenon), which will also affect the imaging effect.

[0005] Based on this, the present application proposes a detection device and a detection method for a clustered optical fiber module to solve the above technical problems. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a detection device and a detection method for a clustered optical fiber module, which can improve the imaging effect and reduce the requirements for the detection environment.

[0007] The first aspect of the present application provides a detection device for a clustered optical fiber module, comprising:

[0008] Base plate, camera, lens, sleeve and fiber optic module;

[0009] The bottom plate is provided with a first fixing ring and a second fixing ring aligned with the first fixing ring, the lens is provided between the first fixing ring and the second fixing ring, the sleeve passes through the first fixing ring and is connected to one end of the lens, and the other end of the lens passes through the second fixing ring and is connected to the lens, the first fixing ring is used to fix the sleeve, and the second fixing ring is used to fix the lens;

[0010] A mounting flange is provided on one end of the sleeve away from the lens, a through hole is provided at the center of the mounting flange, one end of the optical fiber module is located in the through hole and connected to the mounting flange, so that when a light source is irradiated on the other end of the optical fiber module, the camera takes a picture of the end face of the optical fiber module located in the sleeve through the lens.

[0011] Optionally, an extension portion is provided on one side of the mounting flange, an external thread is provided on the extension portion, the sleeve is provided with an internal thread matching the external thread, and the external thread cooperates with the internal thread to connect the extension portion with the sleeve.

[0012] Optionally, a recessed area is provided on the other side of the mounting flange, and connecting plates are provided at both ends of the optical fiber module. When the optical fiber module extends into the through hole, the connecting plates abut against the recessed area.

[0013] Optionally, the camera is an area array camera, and the area array camera is screwed to the lens via threads.

[0014] Optionally, the lens is a telecentric lens, and the magnification of the telecentric lens is 2-3 times.

[0015] Optionally, a limiting structure is provided at one end of the sleeve connected to the lens, and the limiting structure is used to limit the movement of the lens in the sleeve.

[0016] A second aspect of the present application provides a method for detecting a clustered optical fiber module, which is applied to the first aspect and any one of the detection devices in the first aspect, comprising:

[0017] A target of fixed size is photographed by a camera to obtain a standard image;

[0018] Establishing an imaging scale according to the standard image;

[0019] Connecting one of the optical fiber combining end and the optical fiber splitting end of the optical fiber module to the sleeve, and aligning the other end of the optical fiber module with a light source;

[0020] Taking a picture of the other end of the optical fiber module in the sleeve by the camera to obtain a detection image;

[0021] The detection image is divided into brightness levels, the area corresponding to each brightness level is determined according to the brightness levels and the imaging scale, the number of optical fibers corresponding to each brightness level is calculated according to the area, and whether the optical fiber module is compliant is determined according to the number of optical fibers corresponding to each brightness level.

[0022] Optionally, when the optical fiber combining end of the optical fiber module is connected to the sleeve, other beams on the optical fiber beam splitting end except the detection beam are covered, and the detection beam is aligned using the light source;

[0023] After obtaining the detection image, the detection method further includes:

[0024] Locate the optical fiber beam splitting block according to the light and dark boundary lines on the detection image;

[0025] Measuring the shape and size of the optical fiber splitting block according to the imaging scale to obtain measurement information;

[0026] The measurement information is compared with the preset information, and whether the optical fiber corresponding to the detection beam splitting is compliant is determined according to the comparison result.

[0027] Optionally, locating the optical fiber splitting block according to the light and dark boundary lines on the detection image includes:

[0028] The edges between the brightness levels in the detection image are determined based on an edge detection algorithm, and a boundary line is drawn on the detection image based on the edge.

[0029] Optionally, judging whether the optical fiber module is compliant according to the number of optical fibers corresponding to each brightness level includes:

[0030] Determine a brightness value set according to the brightness level, wherein the brightness value set includes a brightness value corresponding to each brightness level;

[0031] The brightness value set is traversed based on the preset broken fiber brightness value, and if a target brightness value that is the same as the broken fiber brightness value exists in the brightness value set, it is determined that a broken fiber exists in the optical fiber module.

[0032] It can be seen from the above technical solutions that this application has the following effects:

[0033] In the present application, one end of the lens is connected to the camera, and a sleeve is connected to the other end of the lens. The sleeve is used to connect to the fiber optic module through a mounting flange. After aligning the light on the fiber optic module, if the optical fiber in the fiber optic module is not disconnected, the end of the fiber optic module located in the sleeve will display bright light accordingly. At this time, the fiber optic module can be detected by shooting with the camera and analyzing the captured image, thereby determining whether the fiber optic module is compliant. Compared with the prior art, the present application provides a darkroom environment between the lens and the fiber optic module through a sleeve, shielding the entire imaging light path, thereby improving the contrast of the light path, and thus improving the accuracy of the detection results. Based on the darkroom environment provided by the sleeve, a clear image can be obtained during shooting even if other non-highlight light sources are used, thereby reducing the use of highlight light sources and reducing detection costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a detection device for a clustered optical fiber module provided in the present application;

[0036] Figure 2 Another schematic diagram of a detection device for a clustered optical fiber module provided by the present application;

[0037] Figure 3 A schematic diagram of a limiting structure in a detection device for a clustered optical fiber module provided in the present application;

[0038] Figure 4 A schematic diagram of a detection method for a clustered optical fiber module provided in the present application;

[0039] Figure 5 A schematic diagram of a process for detecting the optical fiber module splitting end in this application;

[0040] Figure 6 This is a schematic diagram of a process for detecting the bundle end of an optical fiber module in this application;

[0041] Figure 7 A schematic diagram of an optical fiber bundle combining end in a detection device for a clustered optical fiber module of the present application;

[0042] Figure 8 A schematic diagram of an optical fiber splitting end in a detection device for a clustered optical fiber module of the present application;

[0043] Among them, there are a base plate 01, a camera 02, a lens 03, a sleeve 04, an optical fiber module 05, a first fixing ring 06, a second fixing ring 07, a positioning hole 08, a mounting flange 09, and a limiting structure 10. DETAILED DESCRIPTION

[0044] In the present invention, the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation directions of the various components or components.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0046] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] The present application provides a detection device and a detection method for a clustered optical fiber module, which are used to improve the imaging effect and reduce the requirements for the detection environment. The specific implementation process of the present application is described as follows.

[0050] See also Figures 1 to 3 The first aspect of the present application provides a detection device for a clustered optical fiber module, comprising:

[0051] Base plate 01, camera 02, lens 03, sleeve 04 and optical fiber module 05; a first fixing ring 06 and a second fixing ring 07 aligned with the first fixing ring 06 are provided on the base plate 01, the lens 03 is arranged between the first fixing ring 06 and the second fixing ring 07, the sleeve 04 passes through the first fixing ring 06 and is connected to one end of the lens 03, and the other end of the lens 03 passes through the second fixing ring 07 and is connected to the lens 03, the first fixing ring is used to fix the sleeve 04, and the second fixing ring 07 is used to fix the lens 03; a mounting flange 09 is provided on the end of the sleeve 04 away from the lens 03, a through hole is provided at the center of the mounting flange 09, one end of the optical fiber module 05 is located in the through hole and is connected to the mounting flange 09, so that when the light source is irradiated on the other end of the optical fiber module 05, the camera 02 takes a picture of the end face of the optical fiber module 05 located in the sleeve 04 through the lens 03.

[0052] The optical fiber module 05 is connected to the end of the sleeve 04 . When the light source irradiates the optical fiber module 05 , the camera 02 is used to take a picture of the optical fiber module 05 in the sleeve 04 through the lens 03 .

[0053] A positioning hole 08 can be set on the bottom plate 01, and the positioning hole 08 passes through the top plate from top to bottom, so that the first fixing ring 06 and the second fixing ring 07 are fixed on the bottom plate 01 through the positioning hole 08, and the bottom plate 01 can also be connected to the ground, desktop or other equipment surfaces through the positioning hole 08.

[0054] The first fixing ring 06 and the second fixing ring 07 are connected to the base plate 01 by screws or bolts respectively, the first end of the lens 03 is fixed in the second fixing ring 07, the first end of the lens 03 passes through the second fixing ring 07 and is connected to the camera 02, the first end of the lens 03 is sleeved outside the camera 02, and the lens 03 is used to improve the shooting distance and shooting clarity of the camera 02; the first fixing ring 06 is aligned with the second fixing ring 07, the second end of the lens 03 is aligned with the second fixing ring 07, the first end of the sleeve 04 is fixed in the first fixing ring 06, and the first end of the sleeve 04 passes through the first fixing ring 06 and is connected to the second end of the lens 03, the first end of the sleeve 04 is sleeved outside the first end of the lens 03, and the second end of the sleeve 04 is connected to the optical fiber module 05.

[0055] The optical fiber module 05 contains an optical fiber bundle composed of several optical fibers. The two ends of the optical fiber module are the optical fiber combining end and the optical fiber splitting end respectively. When light is irradiated at any end of the optical fiber module 05, the light can pass through the optical fiber to reach the other end. For example, when light is irradiated at the optical fiber combining end, if the optical fiber can be used normally, bright light can be displayed at the optical fiber splitting end of the light beam; similarly, when light is irradiated at the optical fiber splitting end, bright light can be displayed at the optical fiber combining end of the light beam.

[0056] The sleeve 04 is made of a light-shielding material and is used to block external light to prevent the external light from affecting the optical path between the optical fiber module 05 and the lens 03, thereby reducing the influence of external light on the detection effect and improving the accuracy of the detection.

[0057] A mounting flange 09 is provided between the optical fiber module 05 and the end of the sleeve 04, a through hole is provided in the middle of the mounting flange 09, and both sides of the mounting flange 09 are respectively connected to the ends of the optical fiber module 05 and the sleeve 04. In this embodiment, the mounting flange 09 is used to achieve a stable connection between the optical fiber module 05 and the sleeve 04, ensure that the position of the optical fiber module 05 remains stable during the detection process, and also provide precise alignment between the optical fiber module 05 and the sleeve 04.

[0058] A through hole is provided in the center of the mounting flange 09, and the through hole allows the end of the optical fiber module 05 to pass through. Both sides of the mounting flange 09 are connected to the ends of the optical fiber module 05 and the sleeve 04 respectively by means of threads, buckles or bolt holes.

[0059] The camera 02 is used to capture the image of the end of the optical fiber module 05 after being focused by the lens 03 . The camera 02 has a photosensitive element with high sensitivity and high resolution, and can clearly record the details, features and brightness of the end of the optical fiber module 05 .

[0060] During the detection process, the light source is placed at the open end of the optical fiber module 05 (the end not connected to the sleeve 04). After the light passes through the optical fiber module 05, the camera 02 takes a picture in the direction of the optical fiber module 05. The taken picture is an end image of the optical fiber module 05 (the end connected to the sleeve 04). The taken image is subsequently analyzed to determine whether the optical fiber module 05 is qualified and the on / off status of each optical fiber in the optical fiber module 05. In this embodiment, by setting the sleeve 04 between the lens 03 and the optical fiber module 05, the requirements of the detection environment can be met and external light interference can be avoided; and through the cooperation of the camera 02 and the lens 03, the microscope detection in the prior art is replaced, which is less susceptible to external vibrations, temperature changes and other factors, and the imaging quality is stabilized.

[0061] In addition, the sleeve 04 provides a darkroom environment between the optical fiber module 05 and the lens 03. The darkroom environment improves the contrast. There is no need for a highlight light source at the exposed end of the optical fiber module 05 (the end not connected to the sleeve 04), and any form of backlighting (point light, surface light, even natural light, and living lighting) can be used.

[0062] In an optional embodiment, an extension portion is provided on one side of the mounting flange 09, and an external thread is provided on the extension portion. The sleeve 04 is provided with an internal thread matching the external thread. The external thread and the internal thread are used to connect the extension portion with the sleeve 04, thereby realizing the connection between the mounting flange 09 and the sleeve 04. Specifically, when connecting with each other, the extension portion can be screwed into the sleeve 04.

[0063] In this optional embodiment, a recessed area is provided on the other side of the mounting flange 09, and connecting plates are provided at both ends of the optical fiber module 05. When the optical fiber module 05 extends into the through hole of the mounting flange 09, the connecting plate abuts against the recessed area of ​​the mounting flange 09. The inner diameter of the recessed area is larger than the outer diameter of the connecting plate. The connecting plate is embedded in the recessed area and fixed in the recessed area by screws. At this time, the end of the optical fiber module 05 is inserted into the through hole of the mounting flange 09. Connecting plates are provided at both ends of the optical fiber module 05, and the end connected to the mounting flange 09 can be replaced according to needs, such as the optical fiber combining end connected to the mounting flange 09, or the optical fiber splitting end connected to the mounting flange 09.

[0064] The connection between the optical fiber module 05 and the sleeve 04 is achieved by installing the flange 09, which can not only improve the replacement efficiency of the optical fiber module 05, but also improve the light shielding performance and reduce the external light entering the sleeve 04 from the connection.

[0065] In an optional embodiment, the camera 02 is an area array camera, which is screwed to the lens 03 via threads. An area array camera is a camera that uses a planar imaging sensor, and has high resolution, fast imaging speed, and intuitive measurement images.

[0066] In order to further fix the area array camera, a support rod may be added to the bottom plate 01, one end of the support rod is connected to the bottom plate 01, and the other end of the support rod abuts against the bottom of the area array camera upwards.

[0067] In an optional embodiment, the lens 03 is a telecentric lens, and the magnification of the telecentric lens is 2-3 times. The magnification in the range of 2-3 times enables the telecentric lens to clearly capture the details of the object while maintaining a sufficient field of view, providing a better depth of field and a larger working distance. The telecentric lens is arranged between the camera 02 and the sleeve 04, eliminating the change in image magnification caused by the change in the distance of the object, thereby reducing the measurement error, and relying on the optical characteristics of the telecentric lens, the image quality can remain stable even when the working conditions change (such as vibration or temperature changes).

[0068] The lens 03 may also be a macro lens or a CCTV lens. The macro lens has high magnification and close focusing capability, can capture details of objects very close to the lens, and has a long focal length and a large aperture to provide sufficient depth of field and light collection capability.

[0069] CCTV lens (Closed-Circuit Television Lens) is also called closed-circuit television surveillance lens. This lens has a wide focal length range, fixed aperture and automatic focus function, with high resolution and wide viewing angle.

[0070] Please continue reading Figure 3 In an optional embodiment, a limiting structure 10 is provided at one end of the sleeve 04 connected to the lens 03, and the limiting structure 10 is used to limit the movement of the lens 03 in the sleeve 04. Specifically, the limiting structure 10 is a top screw, and a step is provided inside the end of the sleeve 04. When the lens 03 is inserted into the sleeve 04, the step abuts against the end surface of the lens 03, and the top screw penetrates the sleeve 04 inwardly. When the top screw is tightened inwardly, it has a limiting effect on the lens 03, thereby preventing the lens 03 and the sleeve 04 from being randomly offset. Three top screws are provided on the sleeve 04, and the angle between adjacent top screws is 120 degrees.

[0071] See also Figure 4 The second aspect of the present application provides a detection method for a clustered optical fiber module, which is applied to the above Figures 1 to 3 The detection device of any one of the embodiments comprises:

[0072] 101. A standard image is obtained by taking a picture of a target of a fixed size through a camera.

[0073] 102. Establish imaging scale based on standard image.

[0074] In this embodiment, accurate calibration of the camera and the lens device is achieved, and a scale between the imaging range and the actual size is established, which is beneficial to subsequent image measurement and positioning.

[0075] In the process of acquiring a standard image, first select a target with a fixed size and clear markings. The size of the target should be precisely known, and the markings should be clearly identifiable so that it can be accurately identified in the image. Secondly, place the target in a fixed position within the camera's field of view, ensuring that the distance, angle and other parameters between the target and the camera remain unchanged to avoid distortion or distortion of the captured image. Finally, use the camera to take a picture of the target to obtain a standard image.

[0076] In the process of establishing the imaging scale, the target's mark is first identified in the standard image. The mark can be realized through image processing algorithms (such as edge detection, template matching, etc.). According to the identified mark, the size is measured in the standard image, and the actual size of the mark is compared with the measured size in the standard image to calculate the imaging scale. The imaging scale represents the actual size corresponding to each pixel in the image. When shooting the test image, the imaging scale is mapped to the test image to facilitate the calculation of the specific size of the optical fiber based on the test image.

[0077] 103. Select one of the optical fiber combining end and the optical fiber splitting end of the optical fiber module and connect it to the sleeve, and use a light source to align the other end of the optical fiber module.

[0078] The two ends of the optical fiber module are respectively an optical fiber combining end and an optical fiber splitting end. The optical fiber combining end is one end where multiple optical fibers are combined into a bundle. The entire optical fiber bundle (formed by a combination of multiple optical fibers) passes through the optical fiber module and forms several smaller optical fiber bundles at the optical fiber splitting end. For example, in the optical fiber module, if there is one optical fiber bundle at the optical fiber combining end, it can be divided into two smaller optical fiber bundles at the optical fiber splitting end (one optical fiber bundle at the optical fiber combining end is evenly divided into two smaller optical fiber bundles); or if there is one optical fiber bundle at the optical fiber combining end, it can be divided into four smaller optical fiber bundles at the optical fiber splitting end.

[0079] In this embodiment, if the optical fiber combining end is connected to the sleeve, a light source is used on the optical fiber splitting end for illumination; similarly, if the optical fiber splitting end is connected to the sleeve, a light source is used on the optical fiber combining end for illumination, and the source of the light source can be point light, surface light, natural light or living lighting.

[0080] 104. Use a camera to take a picture of the other end of the optical fiber module in the sleeve to obtain a detection image.

[0081] When the light source shines on the outside of the fiber optic module, due to the light transmittance of the optical fiber, a bright spot should appear in the sleeve of each optical fiber. The appearance of a bright spot indicates that the optical fiber is normal and not disconnected.

[0082] In this embodiment, a camera is used to take pictures in the direction of the sleeve. A lens is provided between the camera and the sleeve. The lens can adjust the imaging distance so that the camera can accurately take pictures of the end of the optical fiber module and obtain a detection image after taking pictures.

[0083] 105. Divide the detection image into brightness levels, determine the area corresponding to each brightness level according to the brightness level and imaging scale, calculate the number of optical fibers corresponding to each brightness level according to the area, and determine whether the optical fiber module is compliant according to the number of optical fibers corresponding to each brightness level.

[0084] The detection image is an image of the end of the optical fiber module after light is passed through it. It is composed of many tiny light spots. The light spots indicate that the optical fiber is compliant and not disconnected. If the optical fiber is disconnected, a black spot will be displayed on the corresponding detection image.

[0085] Different optical fibers may have different light transmittance and disconnection conditions, so the brightness levels can be divided on the detection image, such as black, slightly bright, slightly dim, and bright. Black means that the optical fiber is disconnected and misaligned, slightly bright means that the optical fiber is disconnected and partially aligned (poor light transmittance), slightly dim means that the optical fiber is disconnected but still fully aligned, and bright means that the optical fiber is normal and not disconnected.

[0086] In dividing the brightness levels, a clear brightness range is set for each brightness level. This brightness range can be set according to the statistical information of the image such as the brightness histogram, standard deviation, and average value; then the image is grayed out, the detection image is converted into a grayscale image, and then the grayscale image is histogram equalized to improve the image contrast and make the brightness distribution more uniform. Finally, an adaptive threshold segmentation algorithm is used to automatically determine the thresholds of different brightness levels according to the local brightness information of the image.

[0087] The regions and area corresponding to each brightness level are determined according to the imaging scale determined in 102 and the brightness range, the real size of each optical fiber is calculated by the imaging scale, and then the number of optical fibers contained in each region is calculated according to the region area and the imaging scale, and whether the optical fibers in each region are compliant is judged according to the number of optical fibers; for example, a black region representing a broken fiber, if it is calculated that the number of optical fibers contained in the black region is 10, it indicates that the optical fiber module is non-compliant, wherein, when a black region appears, no matter how many optical fibers are contained in it, it indicates that the optical fiber module is non-compliant.

[0088] In the process of judging whether the optical fiber module is compliant, the staff needs to define the compliance conditions, such as compliance only when there is no broken fiber, or compliance also when the number of broken fibers is within 10, or compliance also when the optical fiber is broken but all are still aligned, etc. The specific conditions are set according to actual usage requirements.

[0089] In addition, if the brightness level of the optical fiber module meets the preset standards or requirements (for example, uniform brightness, no obvious dark spots, etc.), the optical fiber module is considered to be compliant. If the brightness level of the optical fiber module does not meet the preset standards or requirements, the optical fiber module is considered to be defective or unqualified.

[0090] In the process of determining whether compliance is in place, it is also necessary to determine whether there is a broken fiber in the optical fiber module. Specifically, a brightness value set is determined based on the brightness level, where the brightness value set includes brightness values ​​corresponding to each brightness level. The brightness value set is traversed based on the preset broken fiber brightness value. If the brightness value set contains a target brightness value that is the same as the broken fiber brightness value, it is determined that there is a broken fiber in the optical fiber module. If not, it indicates that there is no broken fiber.

[0091] Compare the brightness level with the preset fiber break brightness, and determine whether there is a fiber break in the optical fiber module based on the comparison result. The fiber break brightness is the brightness (such as black, dim, etc.) presented when the optical fiber is disconnected and is facing the light. Check whether there is a brightness that is the same as the preset fiber break brightness in the brightness level. If so, it is determined that there is a fiber break, and the optical fiber module is considered non-compliant.

[0092] The brightness level can be used to count the proportion of low-brightness optical fibers and thus calculate the number of broken optical fibers.

[0093] When the fiber bundle end of the fiber module is connected to the sleeve, perform the following inspection steps:

[0094] Cover the other beams on the optical fiber beam splitting end except the detection beam, and use a light source to align the detection beam;

[0095] There are multiple smaller fiber bundles on the fiber splitting end (formed by evenly dividing the entire fiber bundle at the fiber combining end). Each smaller fiber bundle is aligned, and the brightness will be displayed in the corresponding area at the fiber combining end. The fiber distribution of a split bundle on the fiber combining end is fixed, such as adjacent or opposite. The specific fiber combining end and the fiber splitting end are as follows: Figure 7 , Figure 8 As shown, the two opposite areas 1 at the fiber combining end correspond to area 1 at the fiber splitting end. When light is directed to area 1 at the fiber splitting end, if the fiber module is compliant, the corresponding two areas 1 at the fiber combining end will light up. If the fiber module is not compliant (fiber breakage), the shapes and numbers of the two areas 1 at the fiber combining end will be different.

[0096] At this time, after the image is captured by the camera, the optical fiber beam splitting block is located according to the light and dark boundary lines on the detection image;

[0097] After aligning any smaller fiber bundle at the fiber splitting end, the end face image of the fiber combining end is captured by a camera. The image at this time is also called a detection image. However, the detection image at this time does not light up the entire fiber combining end, but lights up corresponding to certain areas. There is a light-dark boundary between the light and dark areas on the detection image. The fiber splitting block is circled on the detection image according to the light-dark boundary. It can be circled manually or automatically. The circled lit area is called a fiber splitting block.

[0098] In delineating the optical fiber splitting block, the edge between different brightness in the detection image is determined based on the edge detection algorithm, and a boundary line is drawn on the detection image based on the edge. The area delineated by the boundary line is the optical fiber splitting block.

[0099] The shape and size of the optical fiber splitting block are measured according to the imaging scale to obtain measurement information; the measurement information includes the shape presented by the optical fiber splitting block and the area size of the shape calculated by the imaging scale.

[0100] The measured information is compared with the preset information, and the comparison result is used to determine whether the optical fiber corresponding to the detection beam is compliant.

[0101] The preset information includes the shape information and size information of the fiber optic splitting block. Under normal circumstances without fiber breakage, when light is directed to area 1 of the fiber optic splitting end, two opposing fan-shaped shapes light up at the fiber optic combining end. By comparing the shape information of the actually circled fiber optic splitting block with the preset information, if the shapes are the same (both are fan-shaped), it means that the optical fiber is not running around in the fiber optic module, and there is no fiber breakage. If the shapes are different (for example, the circled fiber optic splitting block is trapezoidal), it means that the optical fiber is broken in the fiber optic module, indicating that the fiber optic module is non-compliant.

[0102] Furthermore, when the light is directed to the area 1 of the optical fiber splitting end, if there is a bright spot in an area other than the corresponding area 1 of the optical fiber combining end, it means that the optical fiber is connected in the optical fiber module.

[0103] After aligning the light and photographing area 1 at the fiber splitting end, change the inspection beam to the beam corresponding to area 2, and cover the remaining beams. Then take photos for inspection, align the light and photograph each beam on the fiber splitting end in turn, circle and compare the images obtained by the photos, so as to obtain the fiber distribution and fiber breakage corresponding to each beam, and then determine whether the fiber optic module is compliant.

[0104] Please read further Figure 5 and Figure 6 , Figure 5 The schematic diagram of the process of connecting the splitting end of the optical fiber module with the sleeve and aligning the beam combining end to detect the splitting end is as follows:

[0105] 201. Determine whether to perform position calibration (whether an imaging scale is generated). If not, first perform step 202 to perform calibration, and then perform step 203. If calibration has been performed, directly perform step 203.

[0106] 203. Cover the optical fiber split beams corresponding to the optical fiber at the combined end to be tested, that is, cover the split beam end and leave one optical fiber split beam uncovered;

[0107] 204. Fix the covered bundle end of the optical fiber module to the mounting flange;

[0108] 205. Turn on the light source, and align the covered optical fiber splitting end with the light source;

[0109] 206. Turn on the camera and take a picture of the end face of the optical fiber bundle end in the sleeve through the camera;

[0110] 207. Circle the detection image captured by the optical fiber bundle combining end, circle the areas showing different brightness, and obtain the block shape;

[0111] 208. Distinguish the light and dark areas in the encircled block shape, count the number of optical fibers in the light and dark areas respectively, and the counting process is assisted by the imaging scale. The optical fiber module is judged whether it is compliant by the calculated number of dark fibers. Block the different optical fiber splits on the splitting end, repeat the above steps 303-308, count the number of optical fibers in the detection images corresponding to the different optical fiber splits, and judge whether they are compliant respectively.

[0112] Figure 6 The schematic diagram of the process of connecting the beam combining end of the optical fiber module with the sleeve, aligning the beam splitting end, and then detecting the beam combining end is as follows:

[0113] 301. Determine whether to perform position calibration (whether an imaging scale is generated). If not, first perform step 302 to perform calibration, and then perform step 303. If calibration has been performed, directly perform step 303.

[0114] 303. Fix the beam splitting end of the optical fiber module to the mounting flange;

[0115] 304. Turn on the light source and align the optical fiber bundle end with the light source;

[0116] 305. Turn on the camera and take a picture of the end face of the optical fiber splitting end in the sleeve through the camera;

[0117] 306. Circle the detection image captured by the optical fiber splitting end, circle the areas showing different brightness, and obtain the block shape;

[0118] 307. Distinguish the light and dark areas in the encircled block shape, count the number of optical fibers in the light and dark areas respectively, and use the imaging scale to assist the counting process. Determine whether the optical fiber module is compliant based on the calculated number of dark fibers.

[0119] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for a clustered optical fiber module, characterized in that: include: Base plate, camera, lens, sleeve and fiber optic module; The bottom plate is provided with a first fixing ring and a second fixing ring aligned with the first fixing ring, the lens is provided between the first fixing ring and the second fixing ring, the sleeve passes through the first fixing ring and is connected to one end of the lens, and the other end of the lens passes through the second fixing ring and is connected to the lens, the first fixing ring is used to fix the sleeve, and the second fixing ring is used to fix the lens; A mounting flange is provided on one end of the sleeve away from the lens, a through hole is provided at the center of the mounting flange, one end of the optical fiber module is located in the through hole and connected to the mounting flange, so that when a light source is irradiated on the other end of the optical fiber module, the camera takes a picture of the end face of the optical fiber module located in the sleeve through the lens.

2. The detection device according to claim 1, characterized in that: An extension portion is provided on one side of the mounting flange, an external thread is provided on the extension portion, and the sleeve is provided with an internal thread matching the external thread, and the external thread cooperates with the internal thread to connect the extension portion with the sleeve.

3. The detection device according to claim 2, characterized in that: A recessed area is provided on the other side of the mounting flange, and connecting plates are provided at both ends of the optical fiber module. When the optical fiber module extends into the through hole, the connecting plates abut against the recessed area.

4. The detection device according to any one of claims 1 to 3, characterized in that: The camera is an area array camera, and the area array camera is screwed to the lens via threads.

5. The detection device according to any one of claims 1 to 3, characterized in that: The lens is a telecentric lens, and the magnification of the telecentric lens is 2-3 times.

6. The detection device according to any one of claims 1 to 3, characterized in that: A limiting structure is provided at one end of the sleeve connected to the lens, and the limiting structure is used to limit the movement of the lens in the sleeve.

7. A method for detecting a clustered optical fiber module, applied to the detection device according to any one of claims 1 to 6, characterized in that: include: A target of fixed size is photographed by a camera to obtain a standard image; Establishing an imaging scale according to the standard image; Connecting one of the optical fiber combining end and the optical fiber splitting end of the optical fiber module to the sleeve, and aligning the other end of the optical fiber module with a light source; Taking a picture of the other end of the optical fiber module in the sleeve by the camera to obtain a detection image; The detection image is divided into brightness levels, the area corresponding to each brightness level is determined according to the brightness levels and the imaging scale, the number of optical fibers corresponding to each brightness level is calculated according to the area, and whether the optical fiber module is compliant is determined according to the number of optical fibers corresponding to each brightness level.

8. The detection method according to claim 7, characterized in that: When the optical fiber combining end of the optical fiber module is connected to the sleeve, the other beams on the optical fiber beam splitting end except the detection beam are covered, and the detection beam is aligned using the light source; After obtaining the detection image, the detection method further includes: Locate the optical fiber beam splitting block according to the light and dark boundary lines on the detection image; Measuring the shape and size of the optical fiber splitting block according to the imaging scale to obtain measurement information; The measurement information is compared with the preset information, and whether the optical fiber corresponding to the detection beam splitting is compliant is determined according to the comparison result.

9. The detection method according to claim 8, characterized in that: The method of locating the optical fiber beam splitting block according to the light and dark boundary lines on the detection image comprises: The edges between the brightness levels in the detection image are determined based on an edge detection algorithm, and a boundary line is drawn on the detection image based on the edges.

10. The detection method according to claim 7, characterized in that: The determining whether the optical fiber module is compliant according to the number of optical fibers corresponding to each brightness level includes: Determine a brightness value set according to the brightness level, wherein the brightness value set includes a brightness value corresponding to each brightness level; The brightness value set is traversed based on the preset broken fiber brightness value, and if a target brightness value that is the same as the broken fiber brightness value exists in the brightness value set, it is determined that a broken fiber exists in the optical fiber module.

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