Optical fiber testing device and testing method

Abstract

The present invention provides an optical fiber testing device and a testing method, which relate to the technical field of optical fiber bending loss testing. The device includes a workbench, an expansion bending assembly, two arc-shaped guide rails, and two clamping seats; the expansion bending assembly includes an expansion base plate and a tensioning airbag, the two arc-shaped guide rails are arranged around the expansion base plate, the two clamping seats are respectively slidably arranged on an arc-shaped guide rail, and the two test benches are respectively provided with a detection transmitter and a detection receiver. The beneficial effects of the present invention are: the test device can adjust the curvature of the optical fiber to be tested without disassembly of the optical fiber testing device, and ensure that the curvature of all points of the test section of the optical fiber to be tested remains consistent. The present invention adopts an expansion airbag to elastically fill the test tube composed of an expansion rod, thereby improving the smoothness of the outer arc surface of the test tube, so as to improve the consistency of the curvature of the optical fiber. The test bench of the present invention is rotatably arranged on the clamping seat to ensure that the detection transmitter and the detection receiver are vertically incident and vertically receive the optical fiber signal.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber bending loss testing, and in particular to an optical fiber testing device and a testing method. Background Art

[0002] In the field of fiber-optic communications and sensing, optical fiber bend loss is a key factor affecting signal transmission quality. When an optical fiber bends due to the installation environment or external stress, the optical signal transmitted within it experiences varying degrees of loss, impacting the performance of the communication system. Therefore, accurately evaluating the optical loss characteristics of optical fibers at various bend angles is crucial for the design, installation, and maintenance of optical fiber products. Traditional testing methods typically utilize a fixed-diameter cylinder or bending fixture to perform optical fiber bend tests. For example, the fiber under test is wrapped around a cylinder of known diameter, and the optical signal loss is measured to assess the fiber's bend performance.

[0003] Chinese patent application number CN201410054691.3 discloses a device and method for bending optical fibers during optical fiber macrobend loss measurement. The device includes a base, on which are provided several groups of winding posts with different diameters and several fiber clamping strips. Each fiber clamping strip is provided with several fractures for clamping optical fibers along its length. Each group of winding posts is arranged symmetrically along the centerline of the base's length. The base is provided with circular mounting grooves and strip-shaped through-holes that respectively match the winding posts and the fiber clamping strips. The device can wind optical fibers onto winding posts of different diameters and secure them, while also quickly releasing the fibers from their bent and secured states.

[0004] Existing fiber optic test devices make it difficult to adjust the curvature of the optical fiber. Testing the signal loss of the same optical fiber at different curvatures requires re-clamping the fiber, a cumbersome operation that can easily introduce clamping errors. Furthermore, changing the curvature of the optical fiber after clamping typically results in changes in the length of the curved section and the angle of light incidence. Simultaneously changing the length and curvature of the curved section of the tested optical fiber is detrimental to the testing principle of the controlled variable method, making it difficult to accurately assess the relationship between the curvature of the tested optical fiber and the optical fiber signal loss. Changing the angle of light incidence also makes it difficult to ensure that the test head receives and receives the optical signal perpendicularly, leading to test errors.

[0005] Therefore, there is an urgent need for an optical fiber testing device and method that can accurately adjust the bending curvature and maintain consistent bending section length without disassembling the optical fiber, so as to achieve efficient and high-precision optical fiber bending loss testing. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides an optical fiber testing device and method. The present invention enables the optical fiber testing device to adjust the curvature of the optical fiber to be tested without disassembly, while ensuring that the degree of curvature at all points of the test section of the optical fiber to be tested remains consistent. The inflatable airbag of the present invention can elastically fill the test tube composed of expansion rods, improving the smoothness of the test tube's outer curved surface, thereby improving the consistency of the curvature of the curvature at all points of the optical fiber to be tested. The arc-shaped guide rail and sliding drive mechanism of the present invention can adjust the winding tangent point position during the diameter adjustment of the expanded cylindrical structure to keep the length of the curved section of the optical fiber to be tested consistent with the length of the test section, thereby avoiding the problem of frequent clamping of the optical fiber to adjust the length of the curved section and reducing testing errors. The test table of the present invention is rotatably mounted on the clamping seat, ensuring that the detection transmitter and detection receiver head are perpendicularly incident and receive optical fiber signals during the rotation of the test table relative to the arc-shaped guide rail. The optical fiber testing device and method of the present invention can test the optical loss rate of the same optical fiber and the same length test section under multiple curvature conditions without disassembly, thereby accurately evaluating the relationship between the curvature of the optical fiber to be tested and the optical fiber signal loss.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions. The optical fiber testing device of the present invention includes a workbench, an expansion bending assembly, two arc-shaped guide rails and two clamping seats;

[0008] The expansion bending assembly is arranged on the workbench, and includes an expansion base plate and an expansion airbag. The expansion base plate is provided with a plurality of expansion chutes, all of which are radially arranged relative to the axis of the expansion base plate. A vertical expansion rod is slidably arranged in each expansion chute, and all expansion rods surround the expansion airbag. An expansion drive mechanism is also provided at the bottom of the expansion base plate, and the expansion drive mechanism is connected to all expansion rods, and is used to drive all expansion rods to slide synchronously in the expansion chute.

[0009] The two arc-shaped guide rails are both slidably arranged on the workbench, the two arc-shaped guide rails surround the expansion base plate, and a sliding drive mechanism is respectively provided on the two clamping seats, each clamping seat is slidably arranged on a arc-shaped guide rail, and the sliding drive mechanism is used to drive the clamping seat to move along the arc-shaped guide rail;

[0010] A test platform is rotatably provided on each of the clamping seats, and a detection transmitter and a detection receiver are respectively provided on the two test platforms. The optical fiber to be tested is wound on the expansion rod, and the two ends of the optical fiber to be tested are respectively fixedly connected to the detection transmitter and the detection receiver;

[0011] Elastic pieces are provided on the outer sides of the two arc-shaped guide rails, and the elastic pieces elastically tighten the arc-shaped guide rails.

[0012] Furthermore, the outer wall of the inflatable airbag is glued and connected to all the expansion rods, and the inflatable airbag is provided with a connecting air nozzle, which is connected to the two-way air pump through an air pipe.

[0013] Furthermore, an upper limit plate is fixed above the expansion base plate, and a vertically arranged fixed shaft rod is provided between the upper limit plate and the expansion base plate. The upper and lower ends of the fixed shaft rod respectively fix the expansion base plate and the upper limit plate. A plurality of upper limit grooves are provided on the upper limit plate, and the upper limit grooves are aligned one by one with the expansion slide grooves. The upper end of the expansion rod is slidably limited in the upper limit groove.

[0014] Furthermore, the expansion airbag is an annular airbag, and the expansion airbag is sleeved outside the fixed shaft.

[0015] Furthermore, the expansion drive mechanism includes a lifting guide rod, a plurality of hinged rods and a lifting drive module. The lifting guide rod is fixedly connected to the bottom of the expansion base plate. The lifting guide rod has a sliding sleeve provided on it. The upper end of each hinged rod is hingedly connected to the lower end of an expansion rod. The lower ends of all hinged rods are hinged to the outer wall of the lifting sleeve. The lifting drive module is used to drive the lifting sleeve to rise and fall along the lifting guide rod.

[0016] Furthermore, the lifting drive module includes a lifting drive motor, a limit plate and a lifting threaded sleeve; the upper end of the lifting threaded sleeve is connected to the lifting sliding sleeve;

[0017] The lifting drive motor is fixed below the limiting plate, a limiting hole is provided on the limiting plate, limiting grooves are provided on both sides of the limiting hole, a limiting convex strip is provided on the outer wall of the lifting threaded sleeve, the lifting threaded sleeve is slidably arranged in the limiting hole, and the limiting convex strip is slidably limited in the limiting groove.

[0018] The inner wall of the lifting thread sleeve is provided with a lifting thread, and the output shaft of the lifting drive motor is connected with a driving screw. The driving screw extends into the lifting thread sleeve and cooperates with the lifting thread sleeve thread.

[0019] Furthermore, the sliding drive mechanism includes a sliding drive motor, and the output shaft of the sliding drive motor is connected to a sliding drive gear;

[0020] An arc-shaped guide groove is provided on the arc-shaped guide rail, an arc-shaped rack is provided inside the arc-shaped guide rail, a sliding guide rod is provided at the lower part of the clamping seat, the sliding guide rod slides in the limited arc-shaped guide groove, the sliding drive motor is fixedly connected to the lower end of the sliding guide rod, and the sliding drive gear is engaged with the arc-shaped rack.

[0021] Furthermore, a rotation mounting hole is provided in the middle of the clamping seat, and a rotation mounting shaft is provided at the lower end of the test bench, and the rotation mounting shaft is rotatably arranged in the rotation mounting hole.

[0022] The optical fiber testing device method of the present invention uses the above-mentioned optical fiber testing device and comprises the following steps:

[0023] S1: Obtain an optical fiber to be tested, and mark a predetermined length of the optical fiber segment to be tested on the optical fiber using two marking points;

[0024] S2: Wrap the optical fiber to be tested around the expansion rod and the tensioning airbag, and clamp the two ends of the optical fiber to be tested on the detection transmitter and the detection receiver respectively;

[0025] S3: Adjust the optical fiber to be tested to be wound around the expansion rod and the tensioning airbag, and clamp the two ends of the optical fiber to be tested to the detection transmitter and the detection receiver respectively;

[0026] S4: Adjust the positions of the two clamping seats through the sliding drive mechanism so that the two marking points become the winding tangent points respectively;

[0027] S5: The detection transmitter emits a detection light of a predetermined intensity toward one end of the optical fiber to be tested, and the detection receiver obtains the intensity of the detection light measurement beam and calculates the optical signal loss of the optical fiber segment to be tested under the curvature;

[0028] S6: Adjust the diameter of the expansion and bending assembly to adjust the curvature of the optical fiber segment to be tested that is wound around the expansion and bending assembly, and repeat steps S3-S4 to calculate the optical signal loss of the optical fiber segment to be tested at another curvature.

[0029] Furthermore, the method for adjusting the diameter of the expansion bending component in step S6 includes the following steps:

[0030] S61: The expansion drive mechanism synchronously adjusts the distances of all expansion rods relative to the axis of the expansion base plate;

[0031] S62: Start the two-way air pump to adjust the air pressure in the expansion airbag so that the outer wall of the expansion airbag fills the gap between adjacent expansion rods in an arc shape.

[0032] The optical fiber testing device and testing method of the present invention have the following beneficial effects:

[0033] (1) The optical fiber testing device includes an expansion bending assembly, two arc-shaped guide rails, and two clamping seats, wherein the expansion bending assembly includes a plurality of expansion rods that can form a test tube structure and an expansion drive mechanism. The optical fiber to be tested is wound on the expansion rods, and the two ends of the test section of the optical fiber to be tested are winding tangent points respectively. The two ends of the optical fiber to be tested are clamped on the detection transmitter and the detection receiver respectively. In addition, the expansion drive mechanism can drive the expansion rods to move synchronously, adjust the outer diameter of the test tube composed of the expansion rods, so that the curvature of the optical fiber to be tested can be adjusted. When the test tube is expanded to a larger diameter, the optical fiber wound on the tube expansion mechanism is easily wound into a polygonal structure. The bidirectional air pump can inflate the expansion airbag to expand the expansion airbag, and the expanded expansion airbag can fill the gap between adjacent expansion rods in an arc shape, ensuring the arc transition of the gap between the expansion rods of the cylindrical expansion mechanism, so that the outer wall of the test tube is smooth. The present invention combines a test cylinder structure composed of an expansion rod and an expansion drive mechanism with an elastic filling of an inflatable airbag, so that the optical fiber testing device can adjust the outer diameter of the test cylinder by synchronously adjusting the distance between the expansion rod and the axis of the expansion base plate, so that the curvature of the optical fiber to be tested wound on the expansion cylinder structure is adjustable. In this way, the optical fiber testing device can adjust the curvature of the optical fiber to be tested without disassembly, while ensuring that the curvature of all points of the test section of the optical fiber to be tested remains consistent.

[0034] (2) The two test benches of the optical fiber test device are respectively movably arranged on two arc-shaped guide rails, and the test benches can slide along the arc-shaped guide rails under the drive of the sliding drive mechanism. After the optical fiber to be tested is clamped, the position of the winding tangent point of the optical fiber to be tested will change during the process of adjusting the outer diameter of the test cylinder to change the curvature of the optical fiber to be tested, which will cause an error between the length of the curved section of the optical fiber to be tested and the length of the test section. The optical fiber test device can actively adjust the position of the winding tangent point of the optical fiber to be tested by adjusting the position of the test bench on the arc-shaped guide rail, thereby ensuring that the position of the winding tangent point of the optical fiber to be tested remains unchanged after the curvature of the optical fiber to be tested changes, thereby eliminating the error between the length of the curved section of the optical fiber to be tested and the length of the test section. The arc-shaped guide rail and the sliding drive mechanism of the present application can adjust the winding tangent point position to keep the length of the curved section of the optical fiber to be tested always the same as the length of the test section during the diameter adjustment of the expanded cylindrical structure, thereby avoiding the problem of frequent clamping of the optical fiber due to adjustment of the length of the curved section and reducing the test error.

[0035] (3) The test bench of the optical fiber test device is rotatably arranged on the clamping seat, so that the angles of the detection transmitter and the detection receiver on the test bench relative to the arc guide rail can be adaptively adjusted; in this way, during the rotation of the test bench relative to the arc guide rail, the detection transmitter and the detection receiver can adaptively adjust their own angles to ensure that the detection transmitter and the detection receiver vertically incident and receive optical fiber signals, thereby further reducing test errors.

[0036] (4) The optical fiber testing device method of the present invention can test the optical loss rate of the same optical fiber and the same length of test section under multiple bending conditions without disassembly, thereby accurately evaluating the relationship between the bending curvature of the optical fiber to be tested and the optical fiber signal loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional structural diagram of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0038] Figure 2 It is a front view of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0039] Figure 3 It is a top view of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0040] Figure 4 This is a diagram of the installation structure of an arc guide rail and a sliding drive motor of an optical fiber testing device according to an embodiment of the present invention.

[0041] Figure 5 The present invention is an installation diagram of a test bench and a clamping base of an optical fiber test device according to an embodiment of the present invention.

[0042] Figure 6 This is a diagram of the installation structure of a tensioning airbag and an expansion rod of an optical fiber testing device according to an embodiment of the present invention.

[0043] Figure 7 This is a schematic diagram of a first partial structure of an optical fiber testing device according to an embodiment of the present invention.

[0044] Figure 8 This is a schematic diagram of a second partial structure of an optical fiber testing device according to an embodiment of the present invention.

[0045] Figure 9 The present invention is a flowchart of an optical fiber testing device method.

[0046] In the above figure: 100-workbench, 101-guide rail slide, 102-support leg, 103-lower support plate, 200-expansion base plate, 201-expansion slide, 202-upper limit plate, 203-upper limit slot, 204-fixed shaft, 205-tensioning airbag, 206-bidirectional air pump, 300-expansion rod, 301-lifting guide rod, 302-hinged rod, 303-lifting sleeve, 400-lifting drive motor, 401-drive screw, 402-lifting threaded sleeve, 40 3-limiting convex strip, 404-limiting plate, 500-arc guide rail, 501-arc guide groove, 502-arc rack, 503-fixing block, 504-elastic member, 505-limiting convex rod, 600-clamping seat, 601-sliding guide rod, 602-sliding drive motor, 603-sliding drive gear, 700-test bench, 701-detection transmitter head, 702-detection receiver head, 703-clamping sleeve, 704-rotating installation shaft, 800-optical fiber to be tested, 801-winding tangent point. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0048] Although the steps in the present invention are arranged with numbers, they are not intended to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0049] Please refer to Figures 1 to 8 The above technical objectives of the present invention are achieved through the following technical solutions. The optical fiber testing device of the present invention includes a workbench 100, an expansion bending component, two arc-shaped guide rails 500 and two clamping seats 600.

[0050] The workbench 100 is a rectangular plate. A plurality of guide rail slots 101 are provided on the workbench 100 . A plurality of support legs 102 and a lower support plate 103 are provided at the bottom of the workbench 100 . The support legs 102 fixedly support the workbench 100 and the lower support plate 103 .

[0051] The expansion bending assembly is arranged on the workbench 100, and the expansion bending assembly includes an expansion base plate 200 and a tensioning airbag 205. The expansion base plate 200 is a circular plate, and a plurality of expansion chutes 201 are provided on the expansion base plate 200. All the expansion chutes 201 are radially arranged relative to the axis of the expansion base plate 200. A vertically arranged expansion rod 300 is slidingly provided in each expansion chute 201. The distances between the plurality of expansion rods 300 relative to the axis of the expansion base plate 200 are all equal. All expansion rods 300 surround the tensioning airbag 205, and the tensioning airbag 205 arc-shaped fills the gaps between adjacent expansion rods 300, so that the expansion rods 300 form an expandable test tube structure; specifically, the outer wall of the tensioning airbag 205 is glued and connected to all the expansion rods 300, and the tensioning airbag 205 is provided with a connecting air nozzle, which is connected to the two-way air pump 206 through an air pipe.

[0052] An expansion drive mechanism is also provided at the bottom of the expansion base plate 200. The expansion drive mechanism is connected to all expansion rods 300 and is used to drive all expansion rods 300 to slide synchronously in the expansion chute 201, thereby achieving the effect of adjusting the diameter of the test cylinder.

[0053] The two curved guide rails 500 are slidably mounted on the workbench 100. The curved guide rails 500 are symmetrically arranged, surrounding the expansion bending assembly. A limiting protrusion is provided at the bottom of each curved guide rail 500, which is slidably retained within the guide rail slot 101. The two curved guide rails 500 surround the expansion base plate 200. A sliding drive mechanism is provided on each of the two clamping seats 600. Each clamping seat 600 is slidably mounted on a curved guide rail 500. The sliding drive mechanism is used to drive the clamping seat 600 to move along the curved guide rail 500.

[0054] A test table 700 is rotatably provided on each of the clamping seats 600, and a detection transmitting head 701 and a detection receiving head 702 are respectively provided on the two test tables 700. The detection transmitting head 701 and the detection receiving head 702 are both provided with a clamping sleeve 703 for clamping the end of the optical fiber. The optical fiber 800 to be tested is wound on the expansion rod 300, and the two ends of the optical fiber to be tested 800 are fixedly clamped on the detection transmitting head 701 and the detection receiving head 702 respectively. By adjusting the position of the test table 700 on the arc guide rail 500, the winding tangent point position of the optical fiber to be tested 800 on the test tube structure can be adjusted.

[0055] Elastic members 503 are located on the outside of each of the two curved guide rails 500. A fixed block is located on the workbench 100. The elastic members 503 are coil springs, each connected to the curved guide rails 500 and the fixed block. The elastic members 503 elastically tighten the curved guide rails 500, thereby maintaining tension on the optical fiber 800 under test.

[0056] It can be understood that after the optical fiber 800 to be tested is clamped, it includes a curved section and a straight section. The two ends of the curved section are the winding tangent points, and the distance from the winding tangent point to the end of the optical fiber 800 to be tested is a straight section. During the test, the bending loss of the optical fiber occurs in the curved section, and the optical fiber loss in the straight section of the optical fiber 800 to be tested can be removed by calculation or ignored (the loss of the optical fiber in the straight section is usually a known parameter).

[0057] During testing, the optical fiber testing device winds the optical fiber 800 under test around the expansion rod 300, with the two ends of the test section of the optical fiber 800 under test serving as winding tangent points. The two ends of the optical fiber 800 under test are respectively clamped to the detection transmitter head 701 and the detection receiver head 702. This ensures that the test section (i.e., the curved section) of the optical fiber 800 under test is completely wrapped around the expansion bending assembly during testing, ensuring that the curvature of all points in the test section of all optical fibers 800 under test remains consistent. Furthermore, the expansion drive mechanism drives the expansion rod 300 to move synchronously, adjusting the outer diameter of the test tube formed by the expansion rod 300, thereby enabling adjustable curvature of the optical fiber 800 under test. The present invention utilizes an expandable test tube structure, which allows the outer diameter of the test tube to be adjusted by synchronously adjusting the distance between the expansion rod 300 and the axis of the expansion base plate 200, thereby enabling adjustable curvature of the optical fiber 800 under test wound around the expansion cylindrical structure. This allows the optical fiber testing device to adjust the curvature of the optical fiber under test without disassembly while ensuring that the curvature of all points in the test section of the optical fiber 800 under test remains consistent.

[0058] The fiber optic testing device's expansion bag 205 is connected to a bidirectional air pump 206. When the test tube expands to a larger diameter, the optical fiber wound around the test tube, which is composed of expansion rods 300, easily forms a polygonal structure. The bidirectional air pump 206 inflates the expansion bag 205, causing it to expand. The expanded expansion bag 205 then arc-fills the gaps between adjacent expansion rods 300, ensuring a circular transition between the expansion rods 300 of the cylindrical expansion mechanism, thereby smoothing the outer wall of the test tube. The present invention utilizes the expansion bag 205 to elastically fill the test tube, which is composed of expansion rods 300, to improve the smoothness of the test tube's outer curved surface, thereby enhancing the consistency of the curvature of the optical fiber being tested.

[0059] It is understandable that when the test tube expands and contracts, the air pressure in the inflatable airbag 205 can be adjusted by the bidirectional air pump 206 to ensure that the inflatable airbag 205 can always fill the gap between adjacent expansion rods 300 in an arc shape.

[0060] In a preferred embodiment, an upper limit plate 202 is fixedly provided above the expansion base plate 200, and a vertically arranged fixed shaft 204 is provided between the upper limit plate 202 and the expansion base plate 200. The upper and lower ends of the fixed shaft 204 respectively fix the expansion base plate 200 and the upper limit plate 202. The upper limit plate 202 is provided with a plurality of upper limit grooves 203, and the upper limit grooves 203 are aligned one by one with the expansion chute 201. The upper end of the expansion rod 300 is slidably limited in the upper limit groove 203. The expansion chute 201 is a stepped groove, so that the upper end of the expansion rod 300 can be abutted against the bottom of the groove, thereby preventing the expansion rod 300 from sliding in the stepped groove and tilting, and ensuring that the expansion rod 300 is in a vertical state during the sliding process of the stepped groove.

[0061] In a preferred embodiment, the expansion drive mechanism includes a lifting guide rod 301, multiple hinged rods 302 and a lifting drive module. The lifting guide rod 301 is fixedly connected to the bottom of the expansion base plate 200. The lifting guide rod 301 is provided with a lifting sleeve 303 on the sliding sleeve. The upper end of each hinged rod 302 is hingedly connected to the lower end of an expansion rod 300. The lower ends of all hinged rods 302 are hinged to the outer wall of the lifting sleeve 303. The lifting drive module is used to drive the lifting sleeve 303 to rise and fall along the lifting guide rod 301.

[0062] The lifting drive module includes a lifting drive motor 400, a limit plate 404 and a lifting threaded sleeve 402; the upper end of the lifting threaded sleeve 402 is connected to the lifting sleeve 303; the lifting drive motor 400 is fixed below the limit plate 404, the limit plate 404 is provided with a limit hole, and limit grooves are provided on both sides of the limit hole. The outer wall of the lifting threaded sleeve 402 is provided with a limit ridge 403, the lifting threaded sleeve 402 is slidably set in the limit hole, and the limit ridge 403 is slidably limited in the limit groove.

[0063] The inner wall of the lifting threaded sleeve 402 is provided with lifting threads. The output shaft of the lifting drive motor 400 is connected to a drive screw 401. The drive screw 401 extends into the lifting threaded sleeve 402 and engages with the lifting threaded sleeve 402. The cooperation structure of the limiting ridge 403 and the limiting groove restricts the rotation of the lifting threaded sleeve 402, thereby allowing the lifting threaded sleeve 402 to move up and down within the limiting hole under the rotation of the drive screw 401.

[0064] In a preferred embodiment, the sliding drive mechanism includes a sliding drive motor 602, the output shaft of which is connected to a sliding drive gear 603. The arcuate guide rail 500 is provided with an arcuate guide groove 501, and an arcuate rack 502 is provided within the arcuate guide rail 500. A sliding guide rod 601 is provided at the lower portion of the clamping seat 600, and the sliding guide rod 601 slides within the arcuate guide groove 501. The sliding drive motor 602 is fixedly connected to the lower end of the drive motor, and the sliding drive gear 603 meshes with the arcuate rack 502. The sliding drive motor 602 drives the sliding drive gear 603 to rotate, thereby driving the sliding guide rod 601 and the clamping seat 600 to move along the arcuate guide groove 501.

[0065] In a preferred embodiment, a rotatable mounting hole is provided in the middle of the clamping base 600, and a rotatable mounting shaft 704 is provided at the lower end of the test table 700. The rotatable mounting shaft 704 is rotatably mounted within the rotatable mounting hole. The test table 700 of this optical fiber testing device is rotatably mounted on the clamping base 600, thereby enabling the angles of the test transmitter 701 and the test receiver 702 on the test table 700 to be adaptively adjusted relative to the curved guide rail 500. This allows the test transmitter 701 and the test receiver 702 to adaptively adjust their angles during rotation of the test table 700 relative to the curved guide rail 500, ensuring that the test transmitter 701 and the test receiver 702 perpendicularly receive and incident optical fiber signals, further reducing testing errors.

[0066] refer to Figure 9 The optical fiber testing device method of the present invention uses the above-mentioned optical fiber testing device, and the method comprises the following steps:

[0067] S1: Obtain an optical fiber to be tested 800 and mark a segment of the optical fiber to be tested of a predetermined length on the optical fiber to be tested 800 using two marking points;

[0068] S2: Wind the optical fiber 800 to be tested on the expansion rod 300 and the tensioning airbag 205, and clamp the two ends of the optical fiber 800 to the detection transmitting head 701 and the detection receiving head 702 respectively;

[0069] S3: Adjust the optical fiber 800 to be wound around the expansion rod 300 and the tensioning airbag 205, and clamp the two ends of the optical fiber 800 to the detection transmitting head 701 and the detection receiving head 702 respectively;

[0070] S4: Adjust the positions of the two clamping seats 600 through the sliding drive mechanism so that the two marked points become the winding tangent points respectively;

[0071] S5: The detection transmitter 701 transmits a detection light of a predetermined intensity to one end of the optical fiber 800 to be tested. The detection receiver 702 obtains the intensity of the detection light measurement beam and calculates the optical signal loss of the optical fiber segment to be tested under the curvature.

[0072] S6: Adjust the diameter of the expansion and bending assembly to adjust the curvature of the optical fiber segment to be tested that is wound around the expansion and bending assembly, and repeat steps S4-S5 to calculate the optical signal loss of the optical fiber segment to be tested at another curvature.

[0073] Furthermore, the method for adjusting the diameter of the expansion bending component in step S6 includes the following steps:

[0074] S61: The expansion drive mechanism synchronously adjusts the distances between all expansion rods 300 and the axis of the expansion base plate 200;

[0075] S62: Start the two-way air pump 206 to adjust the air pressure in the inflatable airbag 205 so that the outer wall of the inflatable airbag 205 fills the gap between adjacent expansion rods 300 in an arc shape.

[0076] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended only for clarity and convenience in describing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0077] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An optical fiber testing device, characterized in that: It comprises a workbench (100), an expansion bending assembly, two arc-shaped guide rails (500) and two clamping seats (600); The expansion bending assembly is arranged on the workbench (100), and the expansion bending assembly includes an expansion base plate (200) and an inflating airbag (205). The expansion base plate (200) is provided with a plurality of expansion chutes (201), and all the expansion chutes (201) are radially arranged relative to the axis of the expansion base plate (200). A vertically arranged expansion rod (300) is slidably arranged in each expansion chute (201); the plurality of expansion rods (300) are radially arranged relative to the axis of the expansion base plate (200). The distances are equal, all expansion rods (300) surround the expansion airbag (205), and the expansion airbag (205) fills the gaps between adjacent expansion rods (300) in an arc shape, so that the expansion rods (300) form an expandable test tube structure; an expansion drive mechanism is also provided at the bottom of the expansion base plate (200), and the expansion drive mechanism is connected to all expansion rods (300), and the expansion drive mechanism is used to drive all expansion rods (300) to slide synchronously in the expansion chute (201); The two arc-shaped guide rails (500) are both slidably arranged on the workbench (100), and a sliding drive mechanism is respectively provided on the two clamping seats (600). Each clamping seat (600) is slidably arranged on a arc-shaped guide rail (500), and the sliding drive mechanism is used to drive the clamping seat (600) to move along the arc-shaped guide rail (500); A test table (700) is rotatably mounted on each of the clamping seats (600), and a detection transmitter (701) and a detection receiver (702) are respectively mounted on the two test tables (700). The optical fiber (800) to be tested is wound around the expansion rod (300), and both ends of the optical fiber (800) to be tested are respectively fixedly connected to the detection transmitter (701) and the detection receiver (702); Elastic members (504) are provided on the outsides of the two arc-shaped guide rails (500), and the elastic members (504) elastically tighten the arc-shaped guide rails (500).

2. The optical fiber testing device according to claim 1, characterized in that: The outer wall of the inflatable airbag (205) is glued and connected to all the expansion rods (300). The inflatable airbag (205) is provided with a connecting air nozzle, and the connecting air nozzle is connected to the two-way air pump (206) through an air pipe.

3. The optical fiber testing device according to claim 2, characterized in that: An upper limit plate (202) is fixedly provided above the expansion base plate (200), and a vertically arranged fixed shaft rod (204) is provided between the upper limit plate (202) and the expansion base plate (200). The upper and lower ends of the fixed shaft rod (204) respectively fix the expansion base plate (200) and the upper limit plate (202). The upper limit plate (202) is provided with a plurality of upper limit grooves (203), and the upper limit grooves (203) are aligned one by one with the expansion slide grooves (201). The upper end of the expansion rod (300) is slidably limited in the upper limit groove (203).

4. The optical fiber testing device according to claim 3, characterized in that: The expansion airbag (205) is an annular airbag, and the expansion airbag (205) is sleeved outside the fixed shaft (204).

5. The optical fiber testing device according to claim 1, characterized in that: The expansion drive mechanism comprises a lifting guide rod (301), a plurality of hinged rods (302) and a lifting drive module, wherein the lifting guide rod (301) is fixedly connected to the bottom of the expansion base plate (200), a lifting sleeve (303) is provided on the upper sliding sleeve of the lifting guide rod (301), the upper end of each hinged rod (302) is hingedly connected to the lower end of an expansion rod (300), and the lower ends of all the hinged rods (302) are hingedly connected to the outer wall of the lifting sleeve (303), and the lifting drive module is used to drive the lifting sleeve (303) to rise and fall along the lifting guide rod (301).

6. The optical fiber testing device according to claim 5, characterized in that: The lifting drive module comprises a lifting drive motor (400), a limit plate (404) and a lifting threaded sleeve (402); the upper end of the lifting threaded sleeve (402) is connected to the lifting sliding sleeve (303); The driving motor is fixed below the limiting plate (404), the limiting plate (404) is provided with a limiting hole, and limiting grooves are provided on both sides of the limiting hole. The outer wall of the lifting thread sleeve (402) is provided with a limiting convex strip (403), and the lifting thread sleeve (402) is slidably arranged in the limiting hole, and the limiting convex strip (403) is slidably limited in the limiting groove. The inner wall of the lifting thread sleeve (402) is provided with a lifting thread, and the output shaft of the lifting drive motor (400) is connected to a driving screw (401), and the driving screw (401) extends into the lifting thread sleeve (402) and is threadedly engaged with the lifting thread sleeve (402).

7. The optical fiber testing device according to claim 1, characterized in that: The sliding drive mechanism comprises a sliding drive motor (602), the output shaft of which is connected to a sliding drive gear (603). The arc guide rail (500) is provided with an arc guide groove (501), an arc rack (502) is provided inside the arc guide rail (500), a sliding guide rod (601) is provided at the lower part of the clamping seat (600), the sliding guide rod (601) slides in the limited arc guide groove (501), the sliding drive motor (602) is fixedly connected to the lower end of the sliding guide rod (601), and the sliding drive gear (603) is engaged with the arc rack (502).

8. The optical fiber testing device according to claim 1, characterized in that: A rotational mounting hole is provided in the middle of the clamping seat (600), and a rotational mounting shaft (704) is provided at the lower end of the test bench (700), and the rotational mounting shaft (704) is rotatably arranged in the rotational mounting hole.

9. A method for testing an optical fiber, characterized in that: The method uses the optical fiber testing device according to any one of claims 1 to 8, and the method comprises the following steps: S1: obtaining an optical fiber to be tested (800), and marking a segment of the optical fiber to be tested of a predetermined length on the optical fiber to be tested (800) using two marking points; S2: Winding the optical fiber to be tested (800) on the expansion rod (300) and the tensioning airbag (205), and clamping the two ends of the optical fiber to be tested (800) on the detection transmitting head (701) and the detection receiving head (702) respectively, to ensure that the curvature of all points of the test section of the optical fiber to be tested (800) remains consistent; S3: adjusting the optical fiber to be tested (800) to be wound around the expansion rod (300) and the tensioning airbag (205), and clamping the two ends of the optical fiber to be tested (800) to the detection transmitting head (701) and the detection receiving head (702) respectively; S4: adjusting the positions of the two clamping seats (600) by means of a sliding drive mechanism so that the two marking points become winding tangent points respectively; S5: The detection transmitting head (701) transmits a detection light of a predetermined intensity to one end of the optical fiber to be tested (800), and the detection receiving head (702) obtains the intensity of the detection light beam and calculates the optical signal loss of the optical fiber segment to be tested under the curvature; S6: Adjust the diameter of the expansion and bending assembly to adjust the curvature of the optical fiber segment to be tested that is wound around the expansion and bending assembly, and repeat steps S3-S4 to calculate the optical signal loss of the optical fiber segment to be tested at another curvature.

10. The optical fiber testing method according to claim 9, characterized in that: The method for adjusting the diameter of the expansion bending component in step S5 includes the following steps: S51: The expansion drive mechanism synchronously adjusts the distances between all expansion rods (300) and the axis of the expansion base plate (200); S52: Start the bidirectional air pump (206) to adjust the air pressure in the inflatable airbag (205) so that the outer wall of the inflatable airbag (205) fills the gap between adjacent expansion rods (300) in an arc shape.

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